Code No. C1394:
INCOMP. Learn Neutral (SAS)
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 -
Troubleshooting
).
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
- When the column switch assembly (Integrated with steering wheel sensor) is replaced,
calibrate the steering wheel sensor.
- When the ACC/FCM-ECU is replaced, calibrate the radar (refer to
).
|
OPERATION
ACC/FCM-ECU communicates with the steering wheel sensor via the CAN bus lines.
DIAGNOSIS CODE SET CONDITION
This diagnosis code is set when the abnormality below is detected:
- The steering wheel sensor has not learned the neutral position yet.
note |
A diagnosis code is not set as a historic fault.
|
PROBABLE CAUSES
- Malfunction of the CAN bus line
- Neutral position of steering wheel sensor not learned
- Malfunction of the column switch assembly (Integrated with steering wheel sensor)
- Malfunction of the ACC/FCM-ECU
|
STEP 1. M.U.T.-III CAN bus diagnostics.
|
|
Use M.U.T.-III to perform the CAN bus diagnosis.
|
|
Q.
Is the check result normal?
|
|
Go to Step 2.
|
|
|
|
Repair the CAN bus lines (Refer to GROUP 54C -
Troubleshooting ).
On completion, go to Step 2.
|
|
|
|
STEP 2. Steering wheel sensor calibration.
|
|
Perform calibration of steering wheel sensor.
|
|
Q.
Has the calibration succeeded?
|
|
Go to Step 3.
|
|
|
|
Replace the column switch assembly (Integrated with steering wheel sensor) (Refer
to GROUP 54A -
Column Switch).
|
|
|
|
STEP 3. M.U.T.-III data list.
|
|
Check the following data list (Refer to ).
|
|
- Item No. 25: Steering angle sensor state
|
|
Q.
Is the check result normal?
|
|
Go to Step 4.
|
|
|
|
Replace the column switch assembly (Integrated with steering wheel sensor) (Refer
to GROUP 54A -
Column Switch).
|
|
|
|
STEP 4. Check whether the diagnosis code is set again.
|
|
Check again if the diagnosis code is set in the ACC/FCM-ECU.
|
|
(1)Erase the diagnosis code.
|
|
(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
|
|
(4)Press the Forward Collision Mitigation system (FCM) and Ultrasonic misacceleration
Mitigation System (UMS) ON/OFF switch to turn the FCM system to ON.
|
|
(5)On completion, check that the diagnosis code is set again.
|
|
Q.
Is diagnosis code No. C1394 set?
|
|
Replace the ACC/FCM-ECU (Refer to ).
|
|
|
|
Intermittent malfunction (Refer to GROUP 00 -
How to Cope with Intermittent
Malfunctions).
|
|
|