C1240

C1240-STEERING ANGLE SENSOR OVERTRAVEL PERFORMANCE

When Monitored:

With ignition on but not if a CAN time out failure is detected.

Or if a fault is detected by the Steering Angle Sensor.

Set Condition:

If the Anti-Lock Brakes Module detects sensor overtravel over 720 degrees.






1. CHECK FOR A DTC C1240-STEERING ANGLE SENSOR OVERTRAVEL PERFORMANCE

NOTE: This DTC must be active for the results of this test to be valid

Turn the ignition on.
With the scan tool read and record DTC's.
With the scan tool read and record Freeze Fame information.
With the scan tool erase DTC's.
Start the engine.
Turn steering wheel from lock to lock
With the scan tool read and record DTC's.

Does the scan tool display: C1240-STEERING ANGLE SENSOR OVERTRAVEL PERFORMANCE?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION diagnostic procedure.
- Perform ABS VERIFICATION TEST - VER 1.

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

With 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

- Refer to 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 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 Module.
- Perform ABS VERIFICATION TEST VER 1.

No

- Replace the Steering Angle Sensor.
- Perform ABS VERIFICATION TEST VER 1.

5. CHECK STEERING ANGLE SENSOR INSTALLATION

WARNING: To avoid personal injury or death5 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 and program the Anti-Lock Brake Module.
- Perform ABS VERIFICATION TEST VER 1.

No

- Repair as necessary.
- Perform ABS VERIFICATION TEST VER 1.