2010 Cadillac CTS Sedan AWD V6-3.6L Page 1044

2010 Cadillac CTS Sedan AWD V6-3.6L Page 1044

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

normal, replace the Engine Control Module.

4. Install fuse that supplies B+ to terminal 56 X2 of the ECM.

5. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal E and ground.

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

Engine Control Module.

瀚慖f greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the Engine Control Module.

6. Ignition ON, verify that the scan tool Throttle Position Sensor 1 voltage parameter is less than 0.3 V.

瀚慖f greater than the specified value, test the signal circuit terminal D for a short to voltage. If the circuit tests normal, replace the Engine

Control Module.

7. Connect a 3 A fused jumper wire between the 5 V reference circuit terminal E and the TP sensor 1 signal circuit terminal D. Verify the scan

tool Throttle Position Sensor 1 voltage parameter is greater than 4.89 V.

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

replace the Engine Control Module.

8. Verify the scan tool Throttle Position Sensor 2 voltage parameter is greater than 4.97 V.

瀚慖f less than the specified value, test the signal circuit terminal F for a short to ground. If the circuit tests normal, replace the Engine

Control Module.

Note: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage.

9. Connect a 3 A fused jumper wire between the TP sensor 2 signal circuit terminal F and the low reference circuit terminal C. Verify the scan

tool Throttle Position Sensor 2 voltage parameter is less than 0.10 V.

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

replace the Engine Control Module.

10. If all circuits test normal, replace the throttle body assembly.

Repair Instructions

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

* Throttle Body Assembly Replacement (LF1) (See: Powertrain Management/Fuel Delivery and Air Induction/Throttle Body/Service and

Repair/Removal and Replacement)Throttle Body Assembly Replacement (LLT) (See: Powertrain Management/Fuel Delivery and Air

Induction/Throttle Body/Service and Repair/Removal and Replacement)

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

programming

P124A

DTC P1248, P1249, P124A, P124B, P124C, or P124D (w/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 P1248

- Cylinder 1 Injector High Control Circuit Shorted to Control Circuit

DTC P1249

- Cylinder 2 Injector High Control Circuit Shorted to Control Circuit