2010 Cadillac CTS Sedan AWD V6-3.6L Page 673
* Left front sensor circuit terminal 29
* Right front sensor circuit terminal 6
* Left rear sensor circuit terminal 5
* Right rear sensor circuit terminal 2
瀚慖f less than the specified value, test the ignition voltage circuit for a short to ground.
5. Test for infinite resistance between the following signal circuit terminal of the appropriate sensor circuit listed below and ground.
* Left front sensor circuit terminal 28
* Right front sensor circuit terminal 17
* Left rear sensor circuit terminal 4
* Right rear sensor circuit terminal 3
瀚慖f less than the specified value, test the signal circuit for a short to ground.
6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
7. Test for less than 2 ohm between the appropriate ignition voltage circuit terminals listed below.
* Left front sensor circuit terminal 29 at the EBCM harness connector and terminal 1 at the wheel speed sensor harness connector.
* Right front sensor circuit terminal 6 at the EBCM harness connector and terminal 1 at the wheel speed sensor harness connector.
* Left rear sensor circuit terminal 5 at the EBCM harness connector and terminal 1 at the wheel speed sensor harness connector.
* Right rear sensor circuit terminal 2 at the EBCM harness connector and terminal 1 at the wheel speed sensor harness connector.
瀚慖f greater than the specified range, test the ignition voltage circuit for an open or high resistance.
8. Test for less than 2 ohm between the appropriate signal circuit terminals listed below.
* Left front sensor circuit terminal 28 at the EBCM harness connector and terminal 2 at the wheel speed sensor harness connector.
* Right front sensor circuit terminal 17 at the EBCM harness connector and terminal 2 at the wheel speed sensor harness connector.
* Left rear sensor circuit terminal 4 at the EBCM harness connector and terminal 2 at the wheel speed sensor harness connector.
* Right rear sensor circuit terminal 3 at the EBCM harness connector and terminal 2 at the wheel speed sensor harness connector.
瀚慖f greater than the specified range, test the signal circuit for an open or high resistance.
9. If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets, replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Front Wheel Speed Sensor Replacement (RWD) (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Wheel
Speed Sensor/Service and Repair/Front Wheel Speed Sensor Replacement)Front Wheel Speed Sensor Replacement (AWD) (See: Brakes
and Traction Control/Antilock Brakes / Traction Control Systems/Wheel Speed Sensor/Service and Repair/Front Wheel Speed Sensor
Replacement)
* Rear Wheel Speed Sensor Replacement (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Wheel Speed
Sensor/Service and Repair/Rear Wheel Speed Sensor Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for EBCM replacement, setup, and programming
Park Brake
DTC C056D
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) provide an overview of each diagnostic category.
DTC Descriptors
DTC C056D 34
- ECU Hardware Performance RAM Failure
DTC C056D 35
- ECU Hardware Performance ROM Failure
