Thursday, May 20, 2021

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1065

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1065



mV.



瀚慖f greater than the specified range, test the signal circuit for an open/high resistance. If the circuit/connections test normal, replace the



ECM.



4. Connect a 3 A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool HO2S



voltage parameter is less than 60 mV.



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/connections test normal, replace the ECM.



5. Verify that the following conditions do not exist:



* Leaking fuel injectors.



* High fuel system pressure-Refer to Fuel System Diagnosis (See: Powertrain Management/Computers and Control Systems/Testing and



Inspection/Component Tests and General Diagnostics/Fuel System Diagnosis).



* Fuel that is contaminated-Refer to Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool) (See: Powertrain



Management/Computers and Control Systems/Testing and Inspection/Component Tests and General



Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (with Special Tool))Alcohol/Contaminants-in-Fuel Diagnosis (without Special



Tool) (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component Tests and General



Diagnostics/Alcohol/Contaminants-in-Fuel Diagnosis (without Special Tool)).



* Restricted exhaust.



瀚慖f you find any of the above conditions, repair as necessary.



6. If all circuits/connections test normal, replace the appropriate HO2S.



Repair Instructions



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



* 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 (LLT) (See: Powertrain Management/Computers and



Control Systems/Oxygen Sensor/Service and Repair)



* 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 (LLT) (See: Powertrain Management/Computers and



Control Systems/Oxygen Sensor/Service and Repair)



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



programming



P0133



DTC P0133 or P0153 (with LLT)



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 P0133



- HO2S Slow Response Bank 1 Sensor 1



DTC P0153



- HO2S Slow Response Bank 2 Sensor 1



Diagnostic Fault Information

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