C1231

C1231-DRIVE TEST: STEERING ANGLE SENSOR





For a complete wiring diagram, refer to the Wiring Information.

NOTE: The Electronic Stability Control (ESC) may also be referred to as Electronic Stability Program (ESP) depending on the vehicle model year and configuration. Certain components may also reference ESP, ESC, or use the traction control symbol.

- When Monitored:
During the Drive Test.

- Set Condition:
If the Anti-Lock Brakes System (ABS) Module detects implausible Steering Angle Sensor (SAS) data.





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.

1. Ignition on, engine not running.
2. Using the scan tool, read and record DTCs.
3. Using the scan tool, read and record Freeze Frame information.
4. Perform ECU initialization with drive test. Perform the ABS VERIFICATION TEST. ABS Verification Test.
5. Start the engine.
6. Using the scan tool, read and record DTCs.

Does the scan tool display: C1231-DRIVE TEST: STEERING ANGLE SENSOR?

Yes

- Go To 2

No

- Perform the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test.

2. VERIFY THAT THE STEERING ANGLE SENSOR IS ACTIVE ON THE BUS
1. Using the scan tool, select ECU View.
2. 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

- No Response From SAS (Steering Angle Sensor) Perform the No Response from SAS diagnostic procedure.

3. CHECK STEERING ANGLE
1. Turn steering wheel so wheels point in a straight ahead position.
2. 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
1. Turn steering wheel so wheels point in a straight ahead position.
2. With scan tool check steering angle.
3. 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?

Yes

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

No

- Replace the Clockspring (SAS). Clockspring - Installation.

5. CHECK STEERING ANGLE SENSOR INSTALLATION

WARNING: To avoid serious or fatal injury on vehicles equipped with air bags, 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.

1. Turn ignition off to the lock position.
2. Verify that the Clockspring (SAS) is properly installed. Clockspring - Installation.

Is the Clockspring (SAS) properly installed?

Yes

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

No

- Repair as necessary.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.