C1231

C1231 - Drive Test: Steering Angle Sensor

For a complete wiring diagram, refer to.

• When Monitored: During the drive test.

• Set Condition: If the anti lock brakes module detects implausible steering angle sensor data.






Test Step 1 - Test for A DTC C1231 - Drive Test: Steering Angle Sensor

• This DTC must be active for the results of this test to be valid.

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

• DTC C1219 Steering Angle Sensor Erratic Performance

• DTC C121A Steering Angle Sensor Not Initialized

• 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. Refer to => Non-DTC Based Diagnostics. ABS Verification Test

• NOTE: The drive test requires a 90° turn.

• 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 Test Step 2 => [ Test Step 2 - Verify that the Steering Angle Sensor is Active on
the Bus ]

No

• Perform the ABS Intermittent Condition Test. Refer to => Non-DTC Based Diagnostics. ABS Intermittent Condition Test

Test Step 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 Test Step 3 => [ Test Step 3 - Test Steering Angle ]

No

• Perform the appropriate diagnostic procedure. Refer to => Engine DTC-Based Diagnostics.

Test Step 3 - Test Steering Angle

• Turn steering wheel so wheels point in a straight ahead position.

• With scan tool Test steering angle.

Is the Steering Angle reading within 15°?

Yes

• Go to Test Step 4 => [ Test Step 4 - Test Steering Angle Change ]

No

• Go to Test Step 5 => [ Test Step 5 - Test Steering Angle Sensor Installation ]

Test Step 4 - Test Steering Angle Change

• Turn steering wheel so wheels point in a straight ahead position.

• With scan tool Test steering angle.

• 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 module.

• Perform ABS Verification Test. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test

No

• Replace the steering angle sensor. and clear offsets by initializing ECU with wheels pointing straight ahead.

• Perform ABS Verification Test. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test

Test Step 5 - Test Steering Angle Sensor Installation


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 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.

• 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. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test

No

• Repair as necessary and clear offsets by initializing ECU with wheels pointing straight ahead.

• Perform ABS Verification Test. Refer to => Non-DTC
Based Diagnostics. ABS Verification Test