Saturday, May 21, 2022

2010 Cadillac Truck SRX FWD V6-3.0L Page 2038

2010 Cadillac Truck SRX FWD V6-3.0L Page 2038



瀚慖f less than the specified range, test the high and low signal circuits for a short to ground. If both signal circuit test normal, replace the



K20 ECM.



3. Ignition ON, test for 2.5-3.0 V between the high signal circuit terminal B and ground.



瀚慖f less than the specified range, test the high signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.



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



4. Ignition OFF, connect a 3 A fused jumper wire between the high signal circuit terminal B and the low signal circuit terminal A.



Note: The low signal circuit is tied to a pull-up circuit within the ECM. A voltage of 0.90-1.10 V on the low signal circuit is normal.



5. Ignition ON, verify the scan tool HO2S parameter displays 0.0 V.



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



normal, replace the K20 ECM.



6. If all circuits test normal, test or replace the appropriate B52 HO2S.



Repair Instructions



Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution (See: Powertrain Management/Computers and Control



Systems/Oxygen Sensor/Service Precautions/Heated Oxygen Sensor Resistance Learn Reset Caution).



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



* 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)



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



P2309



DTC P0351-P0356, P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310, P2312, P2313, P2315, or P2316 (LAU)



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 P0351



- Ignition Coil 1 Control Circuit



DTC P0352



- Ignition Coil 2 Control Circuit



DTC P0353



- Ignition Coil 3 Control Circuit



DTC P0354



- Ignition Coil 4 Control Circuit



DTC P0355



- Ignition Coil 5 Control Circuit



DTC P0356



- Ignition Coil 6 Control Circuit



DTC P2300



- Ignition Coil 1 Control Circuit Low Voltage

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