Code No. C1219 Abnormality in steering wheel sensor signal


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, Trouble code diagnosis ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When the steering wheel sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to ).
  • Do not drop or shock the G and yaw rate sensor.
  • When the G and yaw rate sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to ).
  • When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor, the G and yaw rate sensor and brake fluid pressure sensor (Refer to , and ).

OPERATION
Steering wheel sensor outputs the signal to ASC-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if any malfunction below is found:

  • The tolerance of neutral position of steering wheel sensor exceeds the specified range.
  • Abnormality in steering wheel sensor output value
  • When abnormality is detected by comparing the value output from the steering wheel sensor with the one from the wheel speed sensor and the G and yaw rate sensor.

PROBABLE CAUSES

  • Improper installation of steering wheel sensor
  • Wheel alignment not performed
  • Steering wheel sensor malfunction
  • Different steering wheel
  • G and yaw rate sensor malfunction
  • Malfunction of wheel speed sensor
  • ASC-ECU malfunction
  • External noise interference
  • Wrong steering wheel is attached

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnosis table ). On completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Q. Is diagnosis code No.C1219 set?
Go to Step 3.
This diagnosis is complete.

STEP 3. M.U.T.-III diagnosis code
Check that the wheel speed sensor-related, G and yaw rate sensor-related, or steering wheel sensor-related diagnosis code is set.

Q. Is the diagnosis code set?
Troubleshoot the relevant diagnosis code, and then go to Step 8.
Go to Step 4.

STEP 4. Check how steering wheel sensor is installed.
Check that the steering wheel sensor is installed correctly (Refer to ).

Q. Is the check result normal?
Go to Step 5.
Install the steering wheel sensor correctly (Refer to ), and then go to Step 5.

STEP 5. Wheel alignment check

Q. Is the check result normal?
After the wheel alignment check, perform the steering wheel sensor calibration to make ASC-ECU learn the neutral point again (Refer to ). Then go to Step 6.
After the adjustment of the wheel alignment, perform the steering wheel sensor calibration to make ASC-ECU learn the neutral position again (Refer to ). Then go to Step 6.

STEP 6. M.U.T.-III data list
Check the following service data (Refer to ).

  • Item 11: Steering angle sensor

Q. Is the check result normal?
Go to Step 7.
After the steering wheel sensor is replaced, perform the steering wheel sensor calibration to make ASC-ECU learn the neutral point again (Refer to ). Then go to Step 8.

STEP 7. Check whether the diagnosis code is reset.
Drive the vehicle at 20 km/h or more.
note The ASC indicator and ASC OFF indicator do not turn OFF in some cases unless the vehicle runs at 20 km/h or higher.

Q. Is diagnosis code No.C1219 set?
Replace the ASC-ECU (Refer to ), and then go to Step 8.
This diagnosis is complete.

STEP 8. Check whether the diagnosis code is reset.
Drive the vehicle at 20 km/h or more.
note The ASC indicator and ASC OFF indicator do not turn OFF in some cases unless the vehicle runs at 20 km/h or higher.

Q. Is diagnosis code No.C1219 set?
Return to Step 1.
This diagnosis is complete.