2010 Cadillac Truck SRX AWD V6-3.0L Page 1015

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2010 Cadillac Truck SRX AWD V6-3.0L Page 1015



1. Ignition OFF, disconnect the harness connector at the B47 fuel pressure sensor.



2. Ignition OFF, test for less than 1 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 K27



fuel pump flow control module.



3. Ignition ON, test for 4.8-5.2 V between the B47 fuel pressure sensor 5 V reference circuit terminal 3 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,



replace the K27 fuel pump flow control module.



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 K27 fuel



pump flow control module.



4. Verify the scan tool fuel pressure sensor voltage is less than 1 V.



瀚慖f greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the K27 fuel



pump flow control module.



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



reference 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 K27 fuel pump flow control module.



6. If all circuits test normal, replace the B47 fuel pressure sensor.



Repair Instructions



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



* Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail (See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Pressure



Sensor/Switch/Service and Repair/Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail)



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



and programming



P018C



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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