Diagnostic Test
- VERIFY THE DTC IS ACTIVE NOTE:
This DTC must be active for the results of this test to be valid.
- Ignition on, engine not running.
- Using the scan tool, read and record DTCs.
- Using the scan tool, read and record Freeze Frame information.
- Perform ECU initialization with drive test. Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
- Start the engine.
- Using the scan tool, read and record DTCs.
Is the DTC active at this time?
Yes
- Go To 2
No
- Perform the ABS-INTERMITTENT CONDITION TEST. Refer to STANDARD PROCEDURE .
- VERIFY THAT THE STEERING ANGLE SENSOR IS ACTIVE ON THE BUS
- Using the scan tool, select ECU View.
- Verify that the Steering Angle Sensor is active on the bus.
Is the Steering Angle Sensor active on the bus?
Yes
- Go To 3
No
- Perform the NO RESPONSE FROM SCCM diagnostic procedure. Refer to NO RESPONSE FROM SCCM (STEERING COLUMN CONTROL MODULE) .
- CHECK STEERING ANGLE
- CHECK STEERING ANGLE CHANGE
- Turn steering wheel so wheels point in a straight ahead position.
- With scan tool check steering angle if reading travels to 720 degrees whiling rotating wheel from lock to lock.NOTE:
Sensor damage can occur if wheel is turned over 720 degrees.
- Rotate steering wheel to the right and the degrees will decrease and rotating steering wheel to the left the degrees will increase.
Did the steering angle change accordingly and display less the 720 degrees from lock to lock?
Yes
- Replace the Anti-lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
- Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
No
- Replace the Steering Control Module (SCM) in accordance with the Service Information. Refer to CLOCKSPRING, REMOVAL .
- CHECK STEERING ANGLE SENSOR INSTALLATION WARNING:
To avoid serious or fatal injury on vehicles equipped with airbags, disable the Supplemental Restraint System (SRS) before attempting any steering wheel, steering column, airbag, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the SRS. Failure to take the proper precautions could result in accidental airbag deployment.
NOTE:Proper Clockspring (SAS) installation is crucial for proper operation.
- Turn ignition off to the lock position.
- Verify that the Clockspring (SAS) is properly installed. Refer to CLOCKSPRING, STANDARD PROCEDURE
.
Is the Clockspring (SAS) properly installed?
Yes
- Replace the Anti-lock Brake System (ABS) Module in accordance with the Service Information. Refer to MODULE, ANTI-LOCK BRAKE SYSTEM, REMOVAL .
- Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .
No
- Repair as necessary.
- Perform the ABS VERIFICATION TEST. Refer to STANDARD PROCEDURE .