C1231

C1231-DRIVE TEST: STEERING ANGLE SENSOR

For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
During the Drive Test.

- Set Condition:
If the Anti-Lock Brakes Module detects implausible Steering Angle Sensor data.





Diagnostic Test

1. CHECK FOR A DTC C1231-DRIVE TEST: STEERING ANGLE SENSOR
NOTE: This DTC must be active for the results of this test to be valid.

NOTE: If any of the following DTCs are present they must be repaired before continuing.

DTC C1219-STEERING ANGLE SENSOR ERRATIC PERFORMANCE
DTC C123F-STEERING ANGLE SENSOR COMPARATIVE PERFORMANCE
DTC C1240-STEERING ANGLE SENSOR ANGLE OVERTRAVEL PERFORMANCE
Turn the ignition on.
With the scan tool, read and record DTCs.
With the scan tool, read and record Freeze Frame information.
Perform ECU initialization with drive test. Perform ABS VERIFICATION TEST. ABS Verification Test.
Start the engine.
With the scan tool, read and record DTCs.
Does the scan tool display: C1231-DRIVE TEST: STEERING ANGLE SENSOR?

Yes

- Go to 2

No

- Refer to the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test

2. VERIFY THAT THE STEERING ANGLE SENSOR IS ACTIVE ON THE BUS
With the scan tool, select Steering Control Module.
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

- for No Response related diagnostic procedures.

3. CHECK STEERING ANGLE
Turn steering wheel so wheels point in a straight ahead position.
With scan tool check steering angle.
Is the Steering Angle reading within ±15 degrees?

Yes

- Go to 4

No

- Go to 5

4. CHECK STEERING ANGLE CHANGE
Turn steering wheel so wheels point in a straight ahead position.
With scan tool check steering angle.
Slowly rotate steering wheel while looking for a smooth change. The degrees will decrease to the right and increase when rotating steering wheel to the left.
Did the steering angle change accordingly?

Yes

- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test.

No

- Replace the Steering Angle Sensor and clear offsets by initializing ECU with wheels pointing straight ahead.
- Perform ABS VERIFICATION TEST. ABS Verification Test.

5. CHECK STEERING ANGLE SENSOR INSTALLATION
WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental restraint system before attempting any steering wheel, steering column, airbag, occupant classification system, 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 supplemental restraint system. Failure to take the proper precautions could result in accidental airbag deployment.

NOTE: Proper Steering Angle Sensor installation is crucial for proper operation.

Turn the ignition off.
Verify that the Steering Angle Sensor is properly installed.
Is the Steering Angle Sensor properly installed?

Yes

- Replace the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST. ABS Verification Test.

No

- Repair as necessary and clear offsets by initializing ECU with wheels pointing straight ahead.
- Perform ABS VERIFICATION TEST. ABS Verification Test.