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DTC C1219: Abnormality in steering wheel sensor 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 (Refer to GROUP 54C - CAN Bus Line Diagnostic Flow ).
  • 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 ).
 
 
CIRCUIT OPERATION
Steering wheel sensor outputs the signal to ASC-ECU via the CAN bus lines.
 
 
 
DTC SET CONDITIONS
This diagnostic trouble code is set if any malfunction below is found:
  • The tolerance of the 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
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use scan tool to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 2.
 
STEP 2. DTC recheck after resetting CAN bus lines
Is DTC C1219 set?
Go to Step 3.
The procedure is complete.
 
STEP 3. M.U.T.-III DTC
Check that the wheel speed sensor-related, G and yaw rate sensor-related, or steering wheel sensor-related DTC is set.
Is the DTC set?
Troubleshoot the relevant DTC, and then go to Step 7.
Go to Step 4.
 
STEP 4. Check how steering wheel sensor is installed.
Check that the steering wheel sensor is installed correctly (Refer to ).
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
Refer to GROUP 33 - On-vehicles service/Front Wheel Alignment Check .
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. Scan tool data list
Check the following data list (Refer to ).
  • Item 05: Steering angle sensor
Is the check result normal?
Go to Step 7.
After the steering wheel sensor is replaced (Refer to ), perform the steering wheel sensor calibration to make ASC-ECU learn the neutral point again (Refer to ). Then go to Step 7.
 
STEP 7. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.
Is DTC C1219 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ), and then go to Step 8.
The procedure is complete.
 
STEP 8. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.
Is DTC C1219 set?
Return to Step 1.
The procedure is complete.