2010 Cadillac Truck SRX AWD V6-3.0L Page 1150

2010 Cadillac Truck SRX AWD V6-3.0L Page 1150

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P06A3 is not set.

瀚慖f the DTC is set, refer to DTC P0641, P0651, P0697, or P06A3 (LF1) (See: P Code Charts/P0641/ECM).

2. Ignition ON, observe both Throttle Position Sensor voltage parameters with a scan tool. Verify the scan tool Throttle Position Sensor 1 and 2

parameters are between 1.0-4.0 V.

3. Perform the scan tool Throttle Sweep Test while observing the Throttle Position Sensors 1 and 2 Agree/Disagree parameter. The parameter

should display Agree.

4. Observe the DTC Information with a scan tool. DTCs P0121, P0122, P0123, P0222, P0223, and P2135 should not set.

5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the Q38 throttle body assembly.

2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm

between the low reference circuit terminal C and ground.

瀚慖f greater than the specified range, test the low reference circuit for a short to voltage, or an open/high resistance. If the circuit tests

normal, replace the K20 ECM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal E and ground.

瀚慖f less than the specified range, test the 5 V reference circuit for a short to ground or open/high resistance. If the circuit tests normal,

replace the K20 ECM.

瀚慖f greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

4. Test for less than 1 V between the TP sensor 1 signal circuit terminal D and ground.

瀚慖f greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

5. Test for 4.8-5.2 V between the TP sensor 2 signal circuit terminal F and ground.

瀚慖f less than specified range, test the signal circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the

K20 ECM.

瀚慖f greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

6. Install a 3 A fused jumper wire between TP sensor 1 signal circuit terminal D and the 5 V reference circuit terminal E. Verify the scan tool

TP sensor 1 voltage parameter is greater than 4.8 V.

瀚慖f less than the specified range, test the signal circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace

the K20 ECM.

7. If all circuits test normal, test or replace the Q38 throttle body assembly.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.

* Throttle Body Assembly Replacement (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Throttle Body/Service and

Repair/Removal and Replacement)Throttle Body Assembly Replacement (LAU) (See: Powertrain Management/Fuel Delivery and Air

Induction/Throttle Body/Service and Repair/Removal and Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, programming, and setup

P0123

DTC P0121-P0123, P0222, P0223, or P2135 (LF1, LFW)

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2010 Cadillac Truck SRX AWD V6-3.0L Page 97

- SDM wiring harness connector

- Roof rail air bag wiring harness connector

- Seat side air bag wiring harness connector

- Passenger instrument panel air bag wiring harness connector

- Seat belt retractor pretensioner wiring harness connector

* The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an

audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly.

* If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct

the high resistance condition due to terminal fretting corrosion.

Observe the scan tool Deployment Loop Resistance parameters while moving the harness near each connector listed below. The reading should stay

consistently between 1.7 and 4.2 ohm without any drop outs or spikes.

* F105 Passenger instrument panel air bag, and Roof rail air bag

* F106 Seat side air bag

* F112 Seat belt retractor pretensioner

* Any inline harness

* K36 SDM

If the reading is erratic while moving the harness, perform the following:

* Inspect each connector terminal for damage or corrosion and repair as necessary.

* Apply Nyogel lubricant 760G to each connector terminal.

* Insure each connector and CPA is correctly seated.

Circuit/System Testing

DTC B0014-B0018 or B0021-B0045

1. Ignition OFF, disconnect the harness connector at the appropriate F105, F106 air bag or F112 seat belt retractor pretensioner.

2. Ignition OFF, disconnect the scan tool, wait 120 seconds, test for greater than 25 ohm between the control circuit terminals listed below:

* F105 Left roof rail airbag terminal 1 and 2

* F105 Right roof rail airbag terminal 1 and 2

* F106 Driver seat side airbag terminal 1 and 2

* F106 Passenger seat side airbag terminal 1 and 2

* F112 Driver seat belt retractor pretensioner terminal 1 and 2

* F112 Passenger seat belt retractor pretensioner terminal 1 and 2

瀚慖f less than the specified range, test for a short between the control circuits, check each connector and CPA to ensure that the shorting

bars are lifted. If the circuits and shorting bars tests normal, replace the K36 SDM.

3. Ignition ON, test for less than 11 V between the control circuit terminals listed below and ground:

* F105 roof rail air bag or F106 seat side air bag control circuit terminal 1

* F105 roof rail air bag or F106 seat side air bag control circuit terminal 2

* F112 seat belt retractor pretensioner control circuit terminal 1

* F112 seat belt retractor pretensioner control circuit terminal 2

瀚慖f greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K36 SDM.

4. Ignition OFF, test for greater than 25 ohm between the control circuit terminals listed below and ground:

* F105 roof rail air bag or F106 seat side air bag control circuit terminal 1

* F105 roof rail air bag or F106 seat side air bag control circuit terminal 2

* F112 seat belt retractor pretensioner control circuit terminal 1

* F112 seat belt retractor pretensioner control circuit terminal 2

瀚慖f less than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the K36 SDM.

5. Install a 3 A fused jumper wire between the control circuit terminals listed below:

* F105 Left roof rail air bag terminal 1 and 2

* F105 Right roof rail air bag terminal 1 and 2

* F106 Driver seat side air bag terminal 1 and 2

* F106 Passenger seat side air bag terminal 1 and 2

* F112 Driver seat belt retractor pretensioner terminal 1 and 2

* F112 Passenger seat belt retractor pretensioner terminal 1 and 2

6. Verify the scan tool Deployment Loop Resistance parameter is less than 2 ohm.

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2010 Cadillac Truck SRX AWD V6-3.0L Page 1348

3. Ignition ON, connect a test lamp between the appropriate high voltage supply circuit and the high voltage control circuit. The Injector

Control Circuit Status should transition from Open to OK.

瀚慖f not the specified value, test for the following conditions in the ECM side of the harness:

* An open/high resistance in the high voltage supply circuit

* An open/high resistance in the high voltage control circuit

* A short to ground in the high voltage control circuit

* A short to voltage in the high voltage supply circuit

瀚慖f the circuits test normal, replace the K20 ECM.

Note: Testing for the following steps is performed on the fuel injector side of the multi-way harness connector. It may be necessary to

remove the intake manifold to isolate the condition.

4. Ignition OFF, measure the resistance between the appropriate high voltage supply circuit and ground. The DMM should display OL ohm.

瀚慖f less than the specified range, test the high voltage supply circuit and the high voltage control circuit for a short to ground. If the

circuits/connections test normal, test or replace the appropriate Q17 fuel injector(s).

5. Test for 2-3 ohm between the appropriate high voltage supply circuit and high voltage control circuit.

瀚慖f less than the specified range, test for a short between the high voltage supply circuit and high voltage control circuit. If the

circuits/connections test normal, test or replace the appropriate Q17 fuel injector(s).

瀚慖f greater than the specified range, test the high voltage supply circuit and high voltage control circuit for an open/high resistance. If the

circuits/connections test normal, test or replace the appropriate Q17 fuel injector.

Component Testing

* Fuel Injector Solenoid Coil Test (LAU) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Injector/Testing and Inspection

)Fuel Injector Solenoid Coil Test (LF1, LFW) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Injector/Testing and

Inspection)

* Fuel Injector Balance Test (LAU) (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests

and General Diagnostics/Fuel Injector Balance Test)Fuel Injector Balance Test (LF1, LFW) (See: Powertrain Management/Computers and

Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Fuel Injector Balance Test)

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Fuel Injection Fuel Rail Assembly Replacement - Bank 1 (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel

Rail/Service and Repair/Fuel Injection Fuel Rail Assembly Replacement - Bank 1)

* Fuel Injection Fuel Rail Assembly Replacement - Bank 2 (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel

Rail/Service and Repair/Fuel Injection Fuel Rail Assembly Replacement - Bank 2)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P0265

DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, or P0277

(LF1)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0201

- Cylinder 1 Injector Control Circuit

DTC P0202

- Cylinder 2 Injector Control Circuit

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2010 Cadillac Truck SRX AWD V6-3.0L Page 1008

Low voltage or a momentary loss of power or ground to the ECM may cause a DTC to set. Verify for the following:

* The battery cables are clean and tight, and the battery is fully charged-Refer to Battery Inspection/Test (See: Starting and Charging/Testing

and Inspection/Component Tests and General Diagnostics/Battery Inspection/Test).

* The ECM ground circuits do not have an open or high resistance

* The ECM power circuits do not have an open, short to ground, or high resistance

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Observe the DTC information with a scan tool. DTC P0601, P0602, P0603, P0604, P0606, P062B, P062F, P0630, P16F3, or P2610 should

not set.

2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition ON, clear the DTC information with a scan tool.

2. Observe the scan tool DTC information. Verify that DTC P0602 or P0630 does not set.

瀚慖f DTC P0602 or P0630 failed this ignition, reprogram the K20 ECM. Refer to Control Module References (See: Testing and

Inspection/Programming and Relearning). If the DTC resets, replace the K20 ECM.

3. Observe the DTC information with a scan tool. Verify that DTC P0601, P0603, P0604, P0606, P062B, P062F, P16F3, or P2610 does not set.

瀚慖f a DTC failed this ignition, replace the K20 ECM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning) for engine control module replacement, setup, and

programming

P0017

DTC P0016, P0017, P0018, or P0019 (LF1, LFW)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

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2010 Cadillac Truck SRX AWD V6-3.0L Page 1143

DTC or a driveability condition. Refer to Temperature Versus Resistance - Engine Coolant Temperature Sensor (See: Powertrain

Management/Computers and Control Systems/Specifications/Temperature Versus Resistance - Engine Coolant Temperature Sensor).

* If the vehicle has sat overnight, the IAT sensor and the ECT sensor values should display within 3掳C (5掳F).

* After starting a cold engine, the ECT sensor temperature should rise steadily, then stabilize after the thermostat opens.

* High resistance in the circuits of either the ECT or IAT sensor could set a DTC.

* DTC's must be cleared before Engine Cooling Fan's are Commanded Off.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Engine idling for 1 min. Observe the DTC information with a scan tool. DTCs P0117 and P0118 should not set.

2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B34 ECT sensor.

Caution: Do NOT use a test lamp to test the continuity of the circuit. Damage to the control module may occur due to excessive current

draw.

Note: The control module or the sensor may be damaged if the circuit is shorted to battery positive voltage.

2. Ignition Off all vehicle systems Off, this may take up to 2 minutes.Test for less than 5 ohm between the low reference circuit terminal A and

ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance, or for a short to voltage. If the circuit tests

normal, replace the K20 ECM.

3. Ignition ON, verify that the scan tool ECT sensor parameter is at -40掳C (-40掳F).

瀚慖f greater than the specified value, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 ECM.

Note: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.

4. Ignition ON, install a 3 A fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the ECT

sensor parameter is greater than 142掳C (288掳F).

瀚慖f less than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace

the K20 ECM.

5. If all circuits test normal, test or replace the B34 ECT sensor.

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2010 Cadillac Truck SRX AWD V6-3.0L Page 310

* A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

Exterior Lights Schematics (See: Diagrams/Electrical Diagrams/Lighting and Horns/System Diagram/Exterior Lights Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)

Circuit/System Verification

Ignition ON, command the Left Dedicated Daytime Running Lamp and the Right Dedicated Daytime Running Lamp ON and OFF with a scan tool.

The E4C daytime running lamp - left and the E4D daytime running lamp - right should turn ON and OFF while changing between the commanded

states.

Circuit/System Testing

1. Ignition OFF, disconnect the appropriate KR42 daytime running lamp relay.

2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 86 and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Connect a test lamp between the B+ circuit terminal 86 and the control circuit terminal 85.

4. Command the appropriate Front Park Lamp test with a scan tool. The test lamp should turn ON and OFF when changing between the

commanded states.

瀚慖f the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM.

瀚慖f the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace

the K9 BCM.

5. If all circuits test normal, test or replace the KR42 daytime running lamp relay.

Component Testing

Relay Test

1. Ignition OFF, disconnect the appropriate KR42 daytime running lamp relay.

2. Test for 60-180 ohm between terminals 85 and 86.

瀚慖f not within the specified range, replace the KR42 daytime running lamp relay.

3. Test for infinite resistance between the following terminals:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

瀚慖f not the specified value, replace the KR42 daytime running lamp relay.

4. Install a 15A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for

less than 2 ohm between terminals 30 and 87.

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2010 Cadillac Truck SRX AWD V6-3.0L Page 1351

(See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Injector/Testing and Inspection).

* If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool Injector

Control Circuit Status parameters. An Injector Control Circuit Status parameter will change from OK or Not Run to Fault if there is a

condition with the circuit or a connection.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Fuel System Description (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and Operation/Fuel System

Description)Fuel System Description (LAU or LY7) (See: Powertrain Management/Fuel Delivery and Air Induction/Description and

Operation/Fuel System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Observe the DTC information with a scan tool. DTC P0685 or P1682 should not set.

瀚慖f a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble

Code (DTC) List - Vehicle).

2. Engine operating, observe the DTC information with a scan tool. DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264,

P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, or P0277 should not set.

3. Observe the scan tool Current Misfire Counter parameters. The Current Misfire Counters should not increment.

4. Ignition ON, observe the scan tool Cylinder 1-6 Injector Control Circuit Status parameters. Verify the Injector Control Circuit Status

parameters display OK.

5. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the appropriate multi-way harness connector X198 or X199, at the rear of the intake manifold.

2. Ignition ON, observe the appropriate scan tool Cylinder 1-6 Injector Control Circuit Status. The parameter should display Open.

瀚慖f not the specified value, test the appropriate high voltage supply circuit, ECM side, for a short to ground or the appropriate high voltage

control circuit, ECM side, for a short to voltage. If the circuits test normal, replace the K20 ECM.

3. Ignition ON, connect a test lamp between the appropriate high voltage supply circuit and the high voltage control circuit. The Injector

Control Circuit Status should transition from Open to OK.

瀚慖f not the specified value, test for the following conditions in the ECM side of the harness:

* An open/high resistance in the high voltage supply circuit

* An open/high resistance in the high voltage control circuit

* A short to ground in the high voltage control circuit

* A short to voltage in the high voltage supply circuit

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2010 Cadillac Truck SRX AWD V6-3.0L Page 192

* Impact sensor wiring harness connector

* SDM wiring harness connector

Note: The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an

audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. Replace

any CPA that is damaged or missing.

If the condition is intermittent or cannot be duplicated, disconnect the connectors and add Nyogel lubricant 760G. This procedure will correct the

high resistance condition due to terminal fretting corrosion.

1. Verify that DTC B0083-B0088 symptom byte 39 or 71 is not set as current.

瀚慖f symptom byte 39 or 71 is set as current, replace the appropriate B59 front impact sensor or B63 side impact sensor.

2. Verify that the SDM calibrations match the VIN data, software part number, and calibration part number.

瀚慖f not the correct data or part number, program the SDM.

3. Verify the correct impact sensors have the correct part numbers, matching the label part numbers with the parts book.

瀚慖f the part numbers do not match, replace the incorrect B59 front impact sensor or B63 side impact sensor

4. Verify that DTC B0083-B0088 symptom byte 01, 02, 04, 05, or 0C is not set as current.

瀚慖f symptom byte 01, 02, 04, 05, or 0C is set as current, refer to Circuit/System Testing.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate B59 front impact sensor or B63 side impact sensor.

2. Ignition OFF, disconnect the scan tool, wait 120 seconds, test for less than 10 ohm between the low reference circuit terminal 2 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K36

SDM.

3. Test for greater than 50k ohm between the signal circuit terminal 1 and ground.

瀚慖f less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K36 SDM.

4. Disconnect the harness connector at the SDM.

5. Test for less than 1 ohm between the impact sensor signal circuit terminal 1 and the SDM terminal listed below.

* B59 Left front impact sensor terminal 23 X2

* B59 Right front impact sensor terminal 26 X2

* B63 Left front side impact sensor terminal 19 X2

* B63 Right front side impact sensor terminal 22 X2

* B63 Left rear side impact sensor terminal 27 X2

* B63 Right rear side impact sensor terminal 30 X2

瀚慖f greater than the specified range, test the circuit for an open/high resistance.

6. If all circuits test normal, replace the B59 front impact sensor or B63 side impact sensor. The DTC should not be set as current.

瀚慖f the DTC resets as current, replace the K36 SDM.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Inflatable Restraint Side Impact Sensor Replacement (See: Restraints and Safety Systems/Air Bag Systems/Impact Sensor/Service and

Repair/Inflatable Restraint Side Impact Sensor Replacement)

* Front End Inflatable Restraint Discriminating Sensor Replacement (See: Restraints and Safety Systems/Air Bag Systems/Impact

Sensor/Service and Repair/Front End Inflatable Restraint Discriminating Sensor Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for SDM replacement, setup, and programming

B0088

DTC B0083-B0088

Diagnostic Instructions

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2010 Cadillac Truck SRX AWD V6-3.0L Page 29

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2010 Cadillac Truck SRX AWD V6-3.0L Page 964

DTC Descriptors

DTC P0010

- Intake Camshaft Position Actuator Solenoid Valve Control Circuit Bank 1

DTC P0013

- Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Bank 1

DTC P0020

- Intake Camshaft Position Actuator Solenoid Valve Control Circuit Bank 2

DTC P0023

- Exhaust Camshaft Position Actuator Solenoid Valve Control Circuit Bank 2

Circuit/System Description

The camshaft position actuator system enables the Engine Control Module (ECM) to change the timing of the camshafts while the engine is

operating. The Camshaft Position Actuator Solenoid Valve signal from the ECM is pulse width modulated (PWM). The ECM controls the

Camshaft Position Actuator Solenoid Valve duty cycle by controlling the amount of solenoid valve ON time. The Camshaft Position Actuator

Solenoid Valve controls the advance or the retard of each camshaft. The Camshaft Position Actuator Solenoid Valve controls the oil flow that

applies the pressure to advance or retard the camshafts.

The ECM controls the Camshaft Position Actuator Solenoid Valve by suppling a 12 V pulse width modulated (PWM) signal. The ECM supplies a

ground to the low reference circuit.

Conditions for Running the DTC

* The ignition voltage is greater than 11 V.

* The ignition switch is in the Crank or Run position.

* The ECM commanded the Camshaft Position Actuator Solenoid Valve ON.

* DTCs P0010, P0013, P0020, and P0023 run continuously once the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

Action Taken When the DTC Sets

DTCs P0010, P0013, P0020, and P0023 are type B DTCs.

Conditions for Clearing the DTC

DTCs P0010, P0013, P0020, and P0023 are type B DTCs.

Diagnostic Aids

If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool circuit status

parameters for the component. The circuit status parameters change from OK or Not Run to Malfunction if there is a condition with the circuit or a

connection.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Camshaft Actuator System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Camshaft

Actuator System)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

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* Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 1 Sensor 1)

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 1 Sensor 2)

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 2 Sensor 1)

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 2 Sensor 2)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM replacement, setup, and programming

P0033

DTC P0033-P0035

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0033

- Turbocharger Bypass Solenoid Valve Control Circuit

DTC P0034

- Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage

DTC P0035

- Turbocharger Bypass Solenoid Valve Control Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The turbocharger bypass solenoid valve is used to prevent the turbo from exceeding the pump limit at low flow and high pressure. This occurs

when the engine is running with a load and the throttle suddenly closes. In this case, flow is almost null and pressure is very high. This not only is

damaging to the turbocharger, but also generates noise and decelerates turbine speed. Ignition voltage is supplied directly to the bypass solenoid

valve and the engine control module (ECM) controls the valve by grounding the control circuit with a solid state device called a driver. The driver

is equipped with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or

shorted to a voltage by monitoring the feedback voltage.

Conditions for Running the DTC

* The engine speed is greater than 80 RPM.

* The ignition voltage is between 10-18 V.

* The ECM has commanded the bypass solenoid valve ON and OFF at least once during the ignition cycle.

* The DTCs run continuously once the above conditions are met.

Conditions for Setting the DTC

P0033

The ECM detects the bypass solenoid valve control circuit is open.

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Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)

Circuit/System Testing

Note: It is recommended that Component Testing is performed before Circuit/System Testing when diagnosing the actuator because the module

will default and does not supply voltage to the sensor when the DTC is set.

1. Ignition OFF, disconnect the harness connector at the M72 Variable Power Steering Solenoid Valve.

2. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground.

瀚慖f the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance.

3. Ignition OFF, connect the test lamp between the control circuit terminal A and the control circuit terminal B.

4. Ignition ON, verify the test lamp briefly illuminates for approximately 1 second, then turns OFF.

瀚慖f the test lamp is always ON, test the control circuit terminal B for a short to ground. If the circuit tests normal, replace the K17

Electronic Brake Control Module (EBCM).

瀚慖f the test lamp is always OFF, test the control circuit terminal B for a short to voltage or an open/high resistance. If the circuit tests

normal, replace the K17 Electronic Brake Control Module (EBCM).

5. If all circuits test normal, test or replace the M72 Variable Power Steering Solenoid Valve.

Component Testing

Static Test

1. Ignition OFF, disconnect the harness connector at the M72 Variable Power Steering Solenoid Valve.

2. Test for 2.5-10 ohm between the control terminals A and B.

瀚慖f not within the specified range, replace the M72 Variable Power Steering Solenoid Valve.

3. Test for infinite resistance between each terminal and the M72 Variable Power Steering Solenoid Valve housing/case.

瀚慖f not the specified value, replace the M72 Variable Power Steering Solenoid Valve.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests)

* Steering Gear Valve Solenoid Replacement (See: Steering and Suspension/Steering/Steering Gear)

* Steering Gear Replacement (See: Steering and Suspension/Steering/Steering Gear)

* Control Module References (See: Testing and Inspection/Programming and Relearning)

C0460

DTC C0460 or C0710

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions)provides an overview of each diagnostic category.

DTC Descriptors

DTC C0460 71

- Steering Position Sensor Invalid Data

DTC C0710 42

- Steering Position Signal Calibration Not Programmed

DTC C0710 5A

- Steering Position Signal Not Plausible

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At least one control output (of four possible outputs) of the appropriate stepper motor is shorted to voltage when motor starts moving. Faults are not

detected when motor is already running or target position is already reached.

B0223 06, B022A 06, B0233 06, B0408 06, B0418 06, B0428 06 or B3531 06

At least one control output (of four possible outputs) of the appropriate stepper motor is shorted to ground or open when motor starts moving.

Faults are not detected when motor is already running or target position is already reached.

Action Taken When the DTC Sets

B023A 02

* The affected output will be switched off for hardware protection.

* All stepper motors are deactivated.

B0223, B022A, B0233, B0408, B0418, B0428 or B3531

* The affected output will be switched off for hardware protection.

* The affected stepper motor is deactivated.

Conditions for Clearing the DTC

The condition for setting the DTC is no longer present.

Reference Information

Schematic Reference

HVAC Schematics (See: Heating and Air Conditioning/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Automatic HVAC Description and Operation (See: Heating and Air Conditioning/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Verify that DTC B023A 02 is not present.

瀚慖f DTC is present, refer to Actuator Power Supply Malfunction.

2. Verify that DTC B0223, B022A, B0233, B0408 or B0418 is not set.

瀚慖f DTC is present, refer to Actuator Malfunction.

Circuit/System Testing

Actuator Power Supply Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate actuator.

2. Ignition ON, verify that a test lamp illuminates between the 12 volt referance circuit terminal 2 and ground.

瀚慖f the test lamp does not illuminate, test the 12 volt referance circuit for a short to ground or an open/high resistance. If the circuit tests

normal test or replace the K33 HVAC control module.

Actuator Malfunction

1. Ignition OFF, disconnect the X3 and X4 harness connector at the K33 HVAC Control Module.

2. Ignition ON, test for 80-200 ohm between the 12 V reference voltage circuit terminal 15 X3 and each control circuit terminal of the

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DTC B388A 02

- Trailer Park Lamps Circuit Short to Ground

DTC B388A 04

- Trailer Park Lamps Circuit Open

Diagnostic Fault Information

Circuit/System Description

The trailer park lamp relay is supplied with battery voltage at all times. The trailer park lamp signal circuit is grounded by turning the headlamp

switch. The body control module (BCM) energizes the trailer park lamp relay by applying ground to the trailer park lamp relay control circuit.

When the trailer park lamp relay is energized, the relay switch contacts close and battery voltage is applied through the trailer park lamp relay fuse

to the trailer park lamp supply voltage circuit which illuminates the trailer park lamps if a trailer is connected.

Conditions for Running the DTC

When the trailer park lamp relay is actively being requested by the BCM.

Conditions for Setting the DTC

B388A 01

The BCM detects a short to voltage on the park lamp supply voltage/marker lamp supply voltage circuit.

B388A 02

The BCM detects a short to ground on the park lamp supply voltage/marker lamp supply voltage circuit

B388A 04

The BCM detects an open/high resistance on the park lamp supply voltage/marker lamp supply voltage circuit

Action Taken When the DTC Sets

B388A 01 or B388A 04

The trailer park lamps are inoperative

B388A 02

The trailer park lamps are always ON

Conditions for Clearing the DTC

* The DTC will be current for as long as the fault is present.

* When the fault is no longer present, the DTC will be a history DTC.

* A history DTC will clear after 40 ignition cycles.

Reference Information

Schematic Reference

Trailer Connector/Provision Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System

Diagram/Trailer Connector/Provision Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Exterior Lighting Systems Description and Operation (See: Lighting and Horns/Description and Operation/Exterior Lighting Systems)

Electrical Information Reference

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Circuit/System Description

The 4X camshaft position sensor circuits consist of an engine control module (ECM) supplied 5 V reference circuit, low reference circuit, and an

output signal circuit. The camshaft position sensor is an internally magnetic biased digital output integrated circuit sensing device. The sensor

detects magnetic flux changes of the teeth and slots of a 4-tooth reluctor wheel attached to the camshaft. As each reluctor wheel tooth rotates past

the camshaft position sensor, the resulting change in the magnetic field is used by the sensor electronics to produce a digital output pulse. The

sensor returns a digital ON/OFF DC voltage pulse of varying frequency, with 4 varying width output pulses per camshaft revolution that represent

an image of the camshaft reluctor wheel. The frequency of the camshaft position sensor output depends on the velocity of the camshaft. The ECM

decodes the narrow and wide tooth pattern to identify camshaft position. The ECM uses the cylinder 1 intake camshaft position sensor to determine

injector and ignition system synchronization. Also, the cylinder 1 intake camshaft position sensor is used to determine camshaft to crankshaft

relationship. This information is then used to determine the optimum ignition and injection points of the engine. The ECM also uses camshaft

position sensor output information to determine the camshaft relative position to the crankshaft, to control camshaft phasing, and for limp-home

operation.

Conditions for Running the DTC

Note: The ECM detects engine movement by sensing the airflow through the MAF sensor when airflow is greater than 3 g/s, or by sensing

crankshaft position sensor pulses.

* DTC P0102, P0103, P0335, P0336, P0641, P0651, or P0697 is not set.

* The engine is cranking or running.

* The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

* The ECM detects that the starter is commanded ON and the engine has been cranking for more than 4 seconds without a camshaft position

sensor pulse.

* The ECM detects that the engine has started, but did not receive a camshaft position sensor pulse during the first engine revolution.

* The ECM detects that the engine is running, but does not receive a camshaft position sensor pulse for 800 of 1,000 engine cycles.

Action Taken When the DTC Sets

* DTCs P0340, P0345, P0365, and P0390 are Type B DTCs.

* The camshaft position actuator is commanded to the Home or Parked position.

Conditions for Clearing the MIL/DTC

DTCs P0340, P0345, P0365, and P0390 are Type B DTCs.

Diagnostic Aids

* With a DTC set, the engine may crank for an extended period of time at start-up.

* The cylinder 1 intake camshaft position sensor is used for injector and ignition system synchronization. A stalling condition will occur if the

CMP sensor signal is intermittent and a DTC will not set. Inspect all cylinder 1 intake camshaft position sensor circuits for poor connections.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Electronic Ignition System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Electronic

Ignition System Description)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

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P0306

DTC P0300-P0306 (LF1, LFW)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P0300

- Engine Misfire Detected

DTC P0301

- Cylinder 1 Misfire Detected

DTC P0302

- Cylinder 2 Misfire Detected

DTC P0303

- Cylinder 3 Misfire Detected

DTC P0304

- Cylinder 4 Misfire Detected

DTC P0305

- Cylinder 5 Misfire Detected

DTC P0306

- Cylinder 6 Misfire Detected

Circuit/System Description

The engine control module (ECM) uses information from the crankshaft position sensor and the camshaft position sensors in order to determine

when an engine misfire is occurring. By monitoring variations in the crankshaft rotation speed for each cylinder, the ECM is able to detect

individual misfire events. A misfire rate that is high enough can cause 3-way catalytic converter damage. The malfunction indicator lamp (MIL)

will flash ON and OFF when the conditions for catalytic converter damage are present. DTCs P0301 through P0306 correspond to cylinders 1

through 6. If the ECM is able to determine that a specific cylinder is misfiring, the DTC for that cylinder will set, and the corresponding fuel

injector is disabled. The ECM will re-enable the fuel injector after 4 crankshaft revolutions when the misfire is not current. The ECM will re-enable

the fuel injector after 8 crankshaft revolutions when the misfire is not current, if the vehicle is equipped with a manual transmission.

Conditions for Running the DTC

* DTC P0010, P0011, P0013, P0014, P0016, P0017, P0018, P0019, P0020, P0021, P0023, P0024, P0068, P0101, P0102, P0103, P0106,

P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0335, P0336, P0606, P0641, P0651,

P1516, P2101, P2122, P2123, P2127, P2128 or P2176 is not set.

* The engine speed is between 450-6,600 RPM.

* The evaporative emissions (EVAP) leak detection is not active.

* The delivered torque signal is greater than 5 % at idle.

* The delivered torque signal is between 6-29 % with the transmission in drive.

* The engine coolant temperature (ECT) is between -7 and +127掳C (+19 and +261掳F).

* The ECM is not receiving a rough road signal.

* The fuel level is greater than 11 %.

* The antilock brake system (ABS) and the traction control system (TCS) are not active or detecting rough road.

* Torque Converter Clutch (TCC) is not applied/active.

* The ECM is not in fuel cut-off or decel fuel cut-off mode.

* DTCs P0300 through P0306 run continuously when the above conditions exist for greater than 1,000 engine revolutions. 200 revolutions

after the first failure.

Conditions for Setting the DTC

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DTC C028A 01

- Park Brake Motor Circuit Short to Battery

DTC C028A 02

- Park Brake Motor Circuit Short to Ground

DTC C028A 04

- Park Brake Motor Circuit Open Circuit

DTC C028A 08

- Park Brake Motor Circuit Performance-Signal Invalid

DTC C028A 28

- Park Brake Motor Circuit Performance-Incorrect Frequency

Circuit/System Description

The parking brake control module has an internal motor, apply actuator, release actuator, and temperature sensor. The parking brake control module

also contains the logic for applying and releasing the parking brake when commanded by the park brake switch. When the parking brake control

module receives a signal from the switch the internal circuit board temperature is checked to verify it is within operating range before the control

module performs the requested operation. The parking brake control module will also diagnose the internal park brake motor circuit to verify it is

functioning properly. The park brake motor circuit is used to command motor operation, apply and release tension on the parking brake cable,

which will apply and release the parking brake.

The park brake will self diagnose the internal Park Brake Motor Circuit. This circuit is used to drive the motor, which pulls on the park brake cable,

ultimately applying and releasing the park brake.

Conditions for Running the DTC

* Ignition OFF, ACCESSORY, or RUN mode.

* Battery voltage is between 9 -16V

Conditions for Setting the DTC

The parking brake control module detects an internal motor malfunction.

Action Taken When the DTC Sets

* The electric parking brake is disabled.

* A message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The parking brake control module clears the history DTC when a current DTC is not detected in 40 ignition cycles.

* The condition for the DTC is no longer present.

Reference Information

Schematic Reference

Park Brake System Schematics (See: Brakes and Traction Control/Parking Brake System/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Electronic Parking Brake Control Module Description (See: Brakes and Traction Control/Parking Brake System/Parking Brake Control

Module/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

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ground to the low reference circuit.

Conditions for Running the DTC

* The ignition voltage is greater than 11 V.

* The ignition switch is in the Crank or Run position.

* The ECM commanded the Camshaft Position Actuator Solenoid Valve ON.

* DTCs P0010, P0013, P0020, and P0023 run continuously once the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

Action Taken When the DTC Sets

DTCs P0010, P0013, P0020, and P0023 are type B DTCs.

Conditions for Clearing the DTC

DTCs P0010, P0013, P0020, and P0023 are type B DTCs.

Diagnostic Aids

If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool circuit status

parameters for the component. The circuit status parameters change from OK or Not Run to Malfunction if there is a condition with the circuit or a

connection.

Reference Information

Schematic Reference

Engine Controls Schematics (LAU) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics

(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Camshaft Actuator System Description (See: Powertrain Management/Computers and Control Systems/Description and Operation/Camshaft

Actuator System)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

Note: If a crankshaft or camshaft position sensor DTC is set, the Camshaft Position Actuator output control will not function.

1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P0335, P0336, P0340, P0341, P0345, P0346, P0365, P0366, P0390,

and P0391 is not set.

瀚慖f a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code Descriptions/Diagnostic Trouble

Code (DTC) List - Vehicle) for further diagnosis.

2. Observe the appropriate control circuit status parameters listed below with a scan tool:

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* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

Ignition ON, observe the function of the trailer tail lamps while commanding the Trailer Park Lamps ON and OFF with a scan tool. The trailer tail

lamps should turn ON and OFF while changing between the commanded states.

Circuit/System Testing

1. Ignition OFF, disconnect the trailer park lamp relay.

2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 86 and ground.

瀚慖f the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

3. Connect a test lamp between the control circuit terminal 85 and the B+ circuit terminal 86.

4. Command the Trailer Park Lamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the

commanded states.

瀚慖f the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace

the K9 BCM.

瀚慖f the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K9 BCM

5. If all circuits test normal, test or replace the trailer park lamp relay.

Component Testing

Relay Test

1. Ignition OFF, disconnect the trailer park lamp relay.

2. Test for 60-180 ohm between terminals 85 and 86.

瀚慖f not within the specified range, replace the trailer park lamp relay.

3. Test for infinite resistance between the following terminals:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

瀚慖f not the specified value, replace the trailer park lamp relay.

4. Install a 5 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less

than 2 ohm between terminals 30 and 87.

瀚慖f greater than the specified range, replace the trailer park lamp relay.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power

Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))

* Control Module References (See: Testing and Inspection/Programming and Relearning)for BCM replacement, programming and setup

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2010 Cadillac Truck SRX AWD V6-3.0L Page 669

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate temperature sensor.

2. Test for less than 10 ohm between the temperature sensor ground circuit terminal B and ground.

瀚慖f greater than the specified value, test the ground circuit for an open/high resistance. If the circuit tests normal, replace the K33 HVAC

Control Module.

3. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground.

瀚慖f less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the

K33 HVAC Control Module.

瀚慖f greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K33 HVAC Control

Module.

4. If all circuits test normal, replace the temperature sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* HVAC Component Replacement Reference (See: Heating and Air Conditioning/Service and Repair/Removal and Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning)

B3588

DTC B3588

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions)provides an overview of each diagnostic category.

DTC Descriptor

DTC B3588 00

- Rear Fog Lamp Switch Circuit Malfunction

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) supplies a reference voltage to the backlight dimmer switch, which is part of the headlamp switch. When the

backlight dimmer switch is placed in a desired brightness position, reference voltage is applied through the backlight dimmer switch resistor ladder

to the BCM. The BCM interprets this voltage signal and will command the interior lights to the desired brightness, command the front fog lamps or

the rear fog lamps depending upon the switch setting selected.

Conditions for Running the DTC

* The ignition is turned ON.

* Low beam or front fog lamps illuminated.

* Rear fog lamp switch activated.

Conditions for Setting the DTC

Rear fog lamp switch stuck.

Action Taken When the DTC Sets

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2010 Cadillac Truck SRX AWD V6-3.0L Page 598

* Accessory Switch Replacement (See: Instrument Panel, Gauges and Warning Indicators/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for BCM replacement, programming and setup

B2750

DTC B2750

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions)provides an overview of each diagnostic category.

DTC Descriptors

DTC B2750 01

- Horn Relay Secondary Circuit Short to Battery

DTC B2750 02

- Horn Relay Secondary Circuit Short to Ground

DTC B2750 04

- Horn Relay Secondary Circuit Open

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) provides a ground for the Horn PCB relay within the underhood fuse block. The underhood fuse block will then

provide B+ voltage to the horn control circuit, sounding the horn.

Conditions for Running the DTC

When the horn output is actively being requested by the BCM.

Conditions for Setting the DTC

B2750 01

The BCM detects a short to voltage in the horn relay control circuit.

B2750 02

The BCM detects a short to ground in the horn relay control circuit.

B2750 04

The BCM detects an open/high resistance in the horn relay control circuit.

Action Taken When the DTC Sets

B2750 01, B2750 04

The horn will be inoperative.

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2010 Cadillac Truck SRX AWD V6-3.0L Page 389

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Content Theft Deterrent (CTD) Description and Operation (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Description

and Operation/Content Theft Deterrent (CTD))

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Verification

Arm the content theft deterrent system. The security LED should illuminate and/or flash during the arming sequence.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the B10B Ambient Light/Sunload Sensor.

2. Test for less than 10 ohm between the low reference circuit terminal 6 and ground.

瀚慖f greater than the specified range, test the low reference circuit for an open/high resistance.

3. Ignition ON, test for less than 1 V between the control circuit terminal 1 and ground.

瀚慖f greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.

4. Command the security LED ON. Test for B+ between the control circuit terminal 1 and ground.

瀚慖f less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace

the K9 BCM.

5. If all circuits test normal, replace the B10B Ambient Light/Sunload Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Sun Load Temperature and Daytime Running Lamp Ambient Light Sensor Replacement (See: Lighting and Horns/Ambient Light

Sensor/Service and Repair)

* Control Module References (See: Testing and Inspection/Programming and Relearning)for BCM replacement, programming and setup

B0954

DTC B0954, B0955, B0956, or B0957

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC B0954 01

- Parking Aid Front Sensor Left Corner Circuit Short to Battery

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2010 Cadillac Truck SRX AWD V6-3.0L Page 473

Conditions for Running the DTC

B1516 08

The BCM is awake.

B1516 66

* The BCM is awake.

* The engine is OFF.

Conditions for Setting the DTC

B1516 08

The battery current signal is less than 4 percent or greater than 96 percent duty cycle for 2 minutes.

B1516 66

The battery current polarity is positive for 2 minutes.

Action Taken When the DTC Sets

The regulated voltage control (RVC) is disabled.

Conditions for Clearing the DTC

The DTC passes when the battery current returns to the normal range for 15 seconds.

Diagnostic Aids

DTC B1516 08 could be set by overcharging with a battery charger or jump starting.

Reference Information

Schematic Reference

Starting and Charging Schematics (See: Starting and Charging/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Charging System Description and Operation (See: Starting and Charging/Charging System/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information

Circuit/System Testing

B1516 08

1. Ignition OFF, disconnect the harness connector at the B18 battery current sensor.

2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 20 Ohms between the low

reference circuit terminal B and ground.

瀚慖f greater than specified range , test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.

瀚慖f less than the specified range , test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal,

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2010 Cadillac Truck SRX AWD V6-3.0L Page 1013

Circuit/System Testing

1. Ignition ON, observe the DTC information with a scan tool. Verify that none of the following DTCs are set. DTC P0010, P0013, P0020,

P0023, P0335, P0336, P0340, P0341, P0345, P0346, P0365, P0366, P0390, or P0391.

瀚慖f any of the DTCs listed are set refer to Diagnostic Trouble Code (DTC) List - Vehicle (See: Diagnostic Trouble Code

Descriptions/Diagnostic Trouble Code (DTC) List - Vehicle) for further diagnosis.

2. Idle the engine at normal operating temperature. DTCs P0016, P0017, P0018, or P0019 should not set.

瀚慖f a DTC sets, inspect for the following and repair as necessary:

* The correct installation of the camshaft sensors

* The correct installation of the crankshaft sensor

* A timing chain tensioner condition

* An incorrectly installed timing chain

* Excessive play in the timing chain

* A mechanical cam actuator that is stuck in the full advance or retard position.

* A timing chain that jumped teeth

* A crankshaft reluctor wheel that has moved in relationship to top dead center (TDC) on the crankshaft

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Timing Chain Alignment Diagram (See: Engine, Cooling and Exhaust/Engine/Timing Components/Timing Component Alignment

Marks/Locations)

* Camshaft Timing Drive Components Cleaning and Inspection (See: Engine, Cooling and Exhaust/Engine/Service and Repair/Overhaul/81.

Camshaft Timing Drive Components Cleaning and Inspection)

* Crankshaft and Bearing Cleaning and Inspection (See: Engine, Cooling and Exhaust/Engine/Service and Repair/Overhaul/66. Crankshaft

and Bearing Cleaning and Inspection)

P018B

DTC P018B-P018D

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P018B

- Fuel Pressure Sensor Performance

DTC P018C

- Fuel Pressure Sensor Circuit Low Voltage

DTC P018D

- Fuel Pressure Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

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2010 Cadillac Truck SRX AWD V6-3.0L Page 452

Conditions for Clearing the DTC

The DTC passes when the malfunction is no longer present.

Diagnostic Aids

A high or low voltage value in multiple modules indicates a concern in the charging system.

Reference Information

Schematic Reference

Remote Function Schematics (See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Keyless Entry/Keyless Entry

Transmitter/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)

Description and Operation

Charging System Description and Operation (See: Starting and Charging/Charging System/Description and Operation)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the C1 battery terminals. The voltage should be between 12.6 and

15.0 V.

瀚慖f the battery voltage is not within the specified range, refer to Charging System Test (See: Starting and Charging/Testing and

Inspection/Component Tests and General Diagnostics/Charging System Test).

2. Engine running, observe the keyless entry control module scan tool Battery Voltage parameters. Verify that the scan tool displays a value that

is within 2 V of the battery terminal voltage.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors of the K84 keyless entry control module.

2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 1 minute. Test for less than 10 Ohms between the ground

circuit terminals listed below and ground:

* Terminal 2 X2

* Terminal 6 X2

瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.

3. Test for greater than 9 V between the B+ circuit terminals listed below and ground:

* Terminal 1 X2

* Terminal 5 X2

瀚慖f less than the specified range, test the B+ circuit for a short to ground or an open/high resistance.

4. If the circuits test normal, replace the K84 keyless entry control module.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

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2010 Cadillac Truck SRX AWD V6-3.0L Page 832

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic

Procedures/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Using the scan tool, locate the Invalid parameter in the Data Display.

2. Refer to the appropriate module to diagnose the invalid data signal. Do not replace the electric parking brake control module.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

C0569

DTC C0569

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions)provides an overview of each diagnostic category.

DTC Descriptor

DTC C0569 00

- System Configuration Malfunction

Circuit/System Description

If the tire type and pressure selection information is not entered with the scan tool during the body control module (BCM) setup, the tire pressure

monitor indicator icon on the instrument panel cluster (IPC) will flash for 1 minute and then remain illuminated after the ignition switch is cycled

ON and the IPC bulb check is complete. If equipped, the driver information center (DIC) will also display a service tire monitor type message.

Under these circumstances, DTC C0569 will be set and the tire type and pressure information will need to be entered for the system to function

correctly.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The BCM has not undergone the tire type and pressure selection setup procedure.

Action Taken When the DTC Sets

* The tire pressure monitor indicator icon on the instrument panel cluster (IPC) will flash for 1 minute and then remain illuminated after the

ignition switch is cycled ON and the IPC bulb check is complete.

* If equipped, the driver information center (DIC) displays a service tire monitor type warning message.

Conditions for Clearing the DTC

A current DTC will clear when the BCM has undergone the tire type and pressure selection setup procedure and 1 ignition cycle has occurred.

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2010 Cadillac Truck SRX AWD V6-3.0L Page 1490

* Restricted Exhaust (See: Engine, Cooling and Exhaust/Exhaust System/Testing and Inspection/Restricted Exhaust)

* Heated Oxygen Sensor Replacement - Bank 1 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 1 Sensor 2)

* Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (LF1) (See: Powertrain Management/Computers and Control Systems/Oxygen

Sensor/Service and Repair/Heated Oxygen Sensor Replacement - Bank 2 Sensor 2)

* Catalytic Converter Replacement - Left Side (LF1) (See: Engine, Cooling and Exhaust/Exhaust System/Catalytic Converter/Service and

Repair/Catalytic Converter Replacement - Left Side)

* Catalytic Converter Replacement - Right Side (LF1) (See: Engine, Cooling and Exhaust/Exhaust System/Catalytic Converter/Service and

Repair/Catalytic Converter Replacement - Right Side)

P0430

DTC P0420 or P0430

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions)provides an overview of each diagnostic category.

DTC Descriptor

DTC P0420

- Catalyst System Low Efficiency Bank 1

DTC P0430

- Catalyst System Low Efficiency Bank 2

Circuit/System Description

A 3-way catalytic converter (TWC) controls emissions of hydrocarbons (HC), carbon monoxide (CO), and oxides of nitrogen (NOx). The catalyst

within the converter promotes a chemical reaction, which oxidizes the HC and the CO that are present in the exhaust gas. This process converts the

HC and the CO into water vapor and carbon dioxide (CO2), and reduces the NOx, converting the NOx into nitrogen. The catalytic converter also

stores oxygen. The engine control module (ECM) monitors this process by using a heated oxygen sensor (HO2S) that is in the exhaust stream after

the TWC. The HO2S 2 produces an output signal that the ECM uses to calculate the oxygen storage capacity of the catalyst. This indicates the

ability of the catalyst to convert the exhaust emissions efficiently. The ECM monitors the efficiency of the catalyst by allowing the catalyst to heat,

then wait for a stabilization period while the engine is idling. The ECM then adds and removes fuel while monitoring the HO2S 2. When the

catalyst is functioning properly, the HO2S 2 response to the extra fuel is slow compared to the response of the HO2S 1, which is located before the

TWC. When the HO2S 2 response is near that of the HO2S 1, the oxygen storage capability and efficiency of the catalyst may be degraded below

an acceptable threshold.

Conditions for Running the DTC

LF1

* DTCs P000A, P000B, P000C, P000D, P0010, P0011, P0013, P0014, P0020, P0021, P0023, P0024, P0030, P0031, P0032, P0050, P0051,

P0052, P0100, P0101, P0102, P0103, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0128, P0130, P0131, P0132, P0133, P0135,

P0137, P0138, P013A, P013C, P013E, P0140, P0141, P014A, P0150, P0151, P0152, P0153, P0155, P0157, P0158, P0160, P0161, P0221,

P0222, P0223, P0300, P0301-P0306, P0443, P0455, P0458, P0459, P0496, P2088, P2089, P2090, P2091, P2092, P2093, P2094, P2095,

P2096, P2097, P2098, P2099, P2100, P2101, P2107, P2119, P2122, P2123, P2127, P2128, P2138, P2176, P2177, P2178, P2179, P2180,

P2187, P2188, P2189, P2190, P2232, P2235, P2270, P2271, P2272, or P2273 is not set.

* Before the ECM performs the idle test, the vehicle must be driven under the following conditions:

- The engine speed is greater than 915 RPM

- The engine run time is greater than a calibrated value

- Both conditions exist for greater than 15 seconds

* The throttle is in the rest position.

* The intake air temperature (IAT) is between -20 to +250掳C (-4 to +482掳F).

* The ignition voltage is greater than 11 volts.

* The engine coolant temperature (ECT) is between 40-127掳C (104-261掳F).

* The barometric pressure (BARO) is greater than 70 kPa.

* The engine has been idling less than 50 seconds.

* The vehicle speed is less than 2 km/h (1 mph).

* The short term fuel trim is learned.

* The air flow into the engine is between 3-13 g/s.

* The EVAP purge concentration is learned.

* The catalytic converter (TWC) calculated temperature is between 450-250掳C (842-1,742掳F).