2010 Cadillac Truck SRX AWD V6-3.0L Page 1187

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2010 Cadillac Truck SRX AWD V6-3.0L Page 1187



* Ignition Coil Supply Voltage Bank 2



瀚慐ach parameter should display ON.



Circuit/System Testing



Note: The ignition circuit supplies voltage to other components. Make sure you test all circuits for a short to ground or test all components for



being shorted that share the ignition circuit.



1. Ignition OFF, disconnect the harness connector at the appropriate T8 ignition coil.



2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground of each T8 ignition coil.



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



瀚慖f the circuit tests normal, with the ignition OFF, disconnect the harness connector at each T8 ignition coil and monitor the fuse while



individually connecting each T8 ignition coil. If the fuse opens, replace the appropriate T8 ignition coil.



3. Ignition OFF, disconnect the K20 ECM harness connector X1.



4. Ignition ON, connect a test lamp between the following ignition voltage circuits and ground:



* X1 67



* X1 62



The test lamp should illuminate on each circuit.



瀚慖f the test lamp does not illuminate, test the ignition circuit for an open/high resistance.



5. If all circuits/connections test normal, replace the K20 ECM.



Repair Instructions



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



* T8 Ignition Coil Replacement - Bank 1 (See: Powertrain Management/Ignition System/Ignition Coil/Service and Repair/Ignition Coil



Replacement - Bank 1)



* T8 Ignition Coil Replacement - Bank 2 (See: Powertrain Management/Ignition System/Ignition Coil/Service and Repair/Ignition Coil



Replacement - Bank 2)



* Control Module References (See: Testing and Inspection/Programming and Relearning) for K20 ECM replacement, setup, and



programming



P0137



DTC P0131, P0132, P0137, P0138, P0151, P0152, P0157, P0158, P2A00, P2A01, P2A03, or P2A04 (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 P0131



- HO2S Circuit Low Voltage Bank 1 Sensor 1



DTC P0132



- HO2S Circuit High Voltage Bank 1 Sensor 1



DTC P0137



- HO2S Circuit Low Voltage Bank 1 Sensor 2



DTC P0138



- HO2S Circuit High Voltage Bank 1 Sensor 2



DTC P0151



- HO2S Circuit Low Voltage Bank 2 Sensor 1



DTC P0152



- HO2S Circuit High Voltage Bank 2 Sensor 1

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