Code No. C1394 INCOMP.learn neutral(SAS)


caution
  • If there is any problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C, CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to and ).
  • When the steering wheel sensor is replaced, always carry out calibration to make ASC-ECU learn the neutral point (Refer to ).

OPERATION


The steering wheel sensor output signal is sent to ASC-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS


ASC-ECU receives the information of the steering wheel sensor calibration from the steering wheel sensor. When this information indicates that the calibration is not performed, the ECU stores the diagnosis code.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

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

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

STEP 2. Diagnosis code recheck after resetting CAN bus lines

Q. Is diagnosis code No. C1394 stored?
Go to Step 3.
This diagnosis is complete.

STEP 3. Steering wheel sensor calibration
Perform calibration of steering wheel sensor. (Refer to .)

Q. Is the check result normal?
Go to Step 4.
After the steering wheel sensor is replaced (Refer to ), calibrate the sensor (Refer to ). Then go to Step 4.

STEP 4. Check whether the diagnosis code is stored again.
Check again if the diagnosis code is stored.
(1)Erase the stored diagnosis code.
(2)Ignition switch: "LOCK" (OFF)
(3)Ignition switch: "ON"

Q. Is diagnosis code No. C1394 stored?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).