DTC C1219 Abnormality in steering wheel sensor signal

caution

If there is any problem in the CAN bus lines, an incorrect DTC may be set. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - Diagnostic 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.

DTC SET CONDITIONS

This DTC 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

Required Special Tools:

MB991958: Scan Tool (M.U.T.-III Sub Assembly)

MB991824: Vehicle Communication Interface (V.C.I.)
MB991827: M.U.T.-III USB Cable
MB991910: M.U.T.-III Main Harness A

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

Use scan tool 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 Diagnostic table ). On completion, go to Step 2.

STEP 2. DTC recheck after resetting CAN bus lines

Q. 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.

Q. Is the DTC set?

	Troubleshoot the relevant DTC, 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. G and yaw rate sensor installation check

Check that the G and yaw rate sensor is installed correctly.

Q. Is the check result normal?

	Go to Step 6.

	Reinstall the G and yaw rate sensor correctly (Refer to ), and then go to Step 6.

STEP 6. 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 7.

	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 7.

STEP 7. 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 8.

	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 9.

STEP 8. Check whether the DTC is reset.

(1)Erase the DTC.

(2)Drive the vehicle at 12mph (20 km/h) or higher.

Q. Is DTC C1219 set?

	Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ), and then go to Step 9.

	The procedure is complete.

STEP 9. Check whether the DTC is reset.

(1)Erase the DTC.

(2)Drive the vehicle at 12mph (20 km/h) or higher.

Q. Is DTC C1219 set?

	Return to Step 1.

	The procedure is complete.