2010 Cadillac CTS Sedan AWD V6-3.0L Page 1836

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2010 Cadillac CTS Sedan AWD V6-3.0L Page 1836



3. Ignition ON, test for 4.8-5.2 V between both 5-volt reference circuit terminals listed below and ground.



* 5 volt reference circuit terminal C



* 5 volt reference circuit terminal F



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



normal, replace the ECM.



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



4. Verify the appropriate APP sensor voltage parameter is at 0 V.



瀚慖f greater than the specified range, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal,



replace the ECM.



* APP sensor 1 signal circuit terminal E



* APP sensor 2 signal circuit terminal B



5. Install a 3 A fused jumper wire between the appropriate signal circuit listed below and the 5-volt reference circuit terminal C. Verify the



appropriate APP sensor voltage parameter is greater than 4.8 V.



* APP sensor 1 signal circuit terminal E



* APP sensor 2 signal circuit terminal B



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



normal, replace the ECM.



6. If all circuits test normal, replace the accelerator pedal assembly.



Repair Instructions



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



* Accelerator Pedal Position Sensor Replacement (See: Powertrain Management/Computers and Control Systems/Accelerator Pedal Position



Sensor/Service and Repair)



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



P2127



DTC P2122, P2123, P2127, P2128, or P2138 (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 P2122



- Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage



DTC P2123



- Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage



DTC P2127



- Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage



DTC P2128



- Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage



DTC P2138



- Accelerator Pedal Position (APP) Sensor 1-2 Correlation



Diagnostic Fault Information

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