2010 Cadillac Truck SRX AWD V6-3.0L Page 779
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, driving in a straight line at a speed greater than 20 km/h (13 mph), observes the scan tool Wheel Speed Sensor parameters. The
readings should be within 1 mph of each other.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate B5 wheel speed sensor.
2. Ignition ON, test for greater than 11 V between the signal circuit terminal B and ground.
瀚慖f less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace
the K17 EBCM.
3. Install a 3 A fused jumper wire at the signal circuit terminal B. Verify the scan tool Wheel Speed Sensor parameter changes while rapidly
tapping the fused jumper wire to the low reference circuit terminal A.
瀚慖f no change is observed, disconnect the harness connector at the K17 EBCM and test for the following conditions below. If all circuits
test normal, replace the K17 EBCM.
* Signal circuit for short to voltage.
* Low reference circuit for a short to voltage, short to ground, or an open/high resistance.
4. If all circuits test normal, test or replace the B5 wheel speed sensor.
Component Testing
Note: The following wheel speed sensor test is polarity sensitive. The wheel speed sensor can be permanently damaged if the polarity is reversed
during the test.
1. Ignition OFF, disconnect the harness connector at the appropriate B5 wheel speed sensor.
2. Connect a 3 A fused jumper wire between the signal terminal 1 and 12 V.
3. Connect a DMM set to read DC amperage between the low reference terminal 2 and ground.
4. Spin the wheel very slowly, test for a DC current switching between a low value of 4-8 mA and a high value of 11-16 mA.
瀚慖f not within the specified range, replace the B5 wheel speed sensor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Front Wheel Speed Sensor Replacement (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
