C1231-DRIVE TEST: STEERING ANGLE SENSOR

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

When Monitored:
During the Drive Test.
Set Condition:
If the Anti-Lock Brake Module detects implausible Steering Angle Sensor data.

Possible Causes
STEERING ANGLE SENSOR INSTALLATION
STEERING ANGLE SENSOR
ANTI-LOCK BRAKE MODULE

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 or DTC C1240-STEERING ANGLE SENSOR ANGLE OVERTRAVEL PERFORMANCE.

1.	Turn the ignition on.

2.	With the scan tool, read and record DTCs.

3.	With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.

4.	Perform ECU initialization with drive test. Perform ABS VERIFICATION TEST (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).

5.	Start the engine.

6.	With the scan tool, read and record DTCs.

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

Yes

Go To 2

Perform the ABS-INTERMITTENT CONDITION TEST (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).

2. VERIFY THAT THE STEERING ANGLE SENSOR IS ACTIVE ON THE BUS

1.	With the scan tool, select Steering Control Module.

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

For No Response related diagnostic procedures (Refer to 29 - Non-DTC Diagnostics/Communication - Diagnosis and Testing) .

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

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.	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 in accordance with the Service Information.
Perform ABS VERIFICATION TEST (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).

Replace the Steering Angle Sensor in accordance with the Service Information and clear offsets by initializing ECU with wheels pointing straight ahead.
Perform ABS VERIFICATION TEST (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).

5. 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 Steering Angle Sensor installation is crucial for proper operation.

1.	Turn the ignition off.

2.	Verify that the Steering Angle Sensor is properly installed.

Is the Steering Angle Sensor properly installed?

Yes

Replace the Anti-Lock Brake Module in accordance with the Service Information.
Perform ABS VERIFICATION TEST (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).

Repair as necessary and clear offsets by initializing ECU with wheels pointing straight ahead.
Perform ABS VERIFICATION TEST (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).

C1231-DRIVE TEST: STEERING ANGLE SENSOR

Possible Causes