Active Center Differential (ACD)

Code No.C1219: Steering Wheel Sensor System (Faulty Signal)

CAUTION:
^ If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines.
^ Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
^ When the steering wheel sensor is replaced, calibrate the steering wheel sensor, and initialize the steering angle correction amount stored in AWC-ECU.
^ Do not drop the G and yaw rate sensor or subject it to a shock.
^ When G and yaw rate sensor is replaced, calibrate G and yaw rate sensor

OPERATION
AWC-ECU receives steering wheel data from the steering wheel sensor via CAN communication.

DTC SET CONDITIONS
This diagnostic trouble code is set when the abnormality below is detected:
^ The tolerance of neutral position of steering wheel sensor exceeds the specified range.
^ Abnormality in steering wheel sensor output value
^ Abnormality is detected by a comparison of output value from the steering wheel sensor with the output values from wheel speed sensor and G and yaw rate sensor.

PROBABLE CAUSES
^ Improper installation of steering wheel sensor
^ Malfunction of steering wheel sensor
^ Malfunction of G and yaw rate sensor
^ Malfunction of wheel speed sensor
^ Malfunction of AWC-ECU
^ Vehicle straight-ahead position and steering wheel neutral position is not matched.

DIAGNOSTIC PROCEDURE

STEP 1. Scan tool CAN bus diagnostics
Using scan tool MB991958, diagnose the CAN bus lines.

Q: Is the check result normal?
YES: Go to Step 3.
NO: Repair the CAN bus lines. After repairing the CAN bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.

Q: Is DTC No. C1219 set?
YES: Go to Step 3.
NO: This diagnosis is complete.

STEP 3. Scan tool diagnostic trouble code

Q: Is DTC No. C2205 set?
YES: Perform the relevant troubleshooting.
NO: Go to Step 4.

STEP 4. Scan tool diagnostic trouble code
Check if the wheel speed sensor-related, G and yaw rate sensor-related, or steering wheel sensor-related diagnostic trouble code is set.

Q: Is the DTC set?
YES: Carry out the appropriate troubleshooting. Then go to Step 9.
NO: Go to Step 5.

STEP 5. Check of steering wheel sensor installation status
Check that the steering wheel sensor is installed correctly.

Q: Is the check result normal?
YES: Go to Step 6.
NO: Install the steering wheel sensor correctly. Then go to Step 6.

STEP 6. Wheel alignment check

Q: Is the check result normal?
YES: After checking the wheel alignment, calibrate the steering wheel sensor, and initialize AWC-ECU steering angle correction amount. Then, go to Step 7.
NO: After adjusting the wheel alignment, calibrate the steering wheel sensor, and initialize AWC-ECU steering angle correction amount. Then, go to Step 7.

STEP 7. Scan tool data list
Item 11: Steering wheel sensor.

Q: Is the check result normal?
YES: Go to Step 8.
NO: Replace the steering wheel sensor. Then, go to Step 9.

STEP 8. Check whether the DTC is reset.

Q: Is DTC No. C1219 set?
YES: Replace the AWC-ECU. Then, go to Step 9.
NO: Intermittent malfunction. (Refer to How to Cope with Intermittent Malfunction).

STEP 9. Check whether the DTC is reset.

Q: Is DTC No. C1219 set?
YES: Return to Step 1.
NO: This diagnosis is complete.