[Previous][Next]
DTC C1394: INCOMP.learn neutral(SAS)
 
 
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.
  • 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 (Refer to GROUP 35C - On-vehicle Service ).
  • 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.
 
 
DIAGNOSTIC TROUBLE CODE SET CONDITION
Check Condition
  • More than 2 seconds have passed since the ignition switch was turned to "ON" position.
Judgment Criterion
  • The steering wheel sensor has not learned the neutral position yet.
noteA DTC is not set as a historic fault.
 
 
PROBABLE CAUSES
  • Neutral position of steering wheel sensor not learned
  • Malfunction of the column switch assembly (Integrated with steering wheel sensor)
  • Malfunction of ACC/FCM-ECU

 
 
DIAGNOSIS
STEP 1. Steering wheel sensor calibration.
Perform calibration of steering wheel sensor (Refer to GROUP 35C - Steering Wheel Sensor Calibration ).
Has the calibration succeeded?
Go to Step 2.
Replace the column switch assembly (Integrated with steering wheel sensor) (Refer to GROUP 35C - Steering Wheel Sensor ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Turn the ignition switch to the "LOCK" (OFF) position to "ON" position.
(3) Press the ACC ON/OFF switch to turn the ACC system to ON.
(4) On completion, check that the DTC is set again.
Is DTC C1394 set?
Replace the ACC/FCM-ECU (Refer to ).
This diagnosis is complete.