[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
54 -CHASSIS ELECTRICAL > 54A-CHASSIS ELECTRICAL > FCM/LDW/AHB-ECU > DIAGNOSIS CODE PROCEDURES > CODE NO. C1781 SAS INTERNAL FAIL
Code No. C1781 SAS internal fail
 
 
caution
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
  • When the steering wheel sensor is replaced, calibrate the steering wheel sensor (Refer to GROUP 35C - On-vehicle Service ).
 
 
OPERATION
FCM/LDW/AHB-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 ECU receives a signal which indicates an internal error in the steering wheel sensor.
 
 
PROBABLE CAUSES
  • The steering wheel sensor has not been calibrated correctly.
  • Malfunction of the steering wheel sensor (column switch assembly)
  • Malfunction of the FCM/LDW/AHB-ECU
 
 
DIAGNOSIS PROCEDURE
STEP 1. Check whether the steering wheel sensor is installed properly.
Is the check result normal?
Go to Step 2.
Install the steering wheel sensor properly.
 
STEP 2. M.U.T.-IIISE data list.
Check the input signal (Refer to ).
  • Vehicle stopped (the steering wheel is in the neutral position)
 
Item No.Item nameNormal condition
17Steering wheel angle-6 to 6 deg
  • Vehicle is running.
 
Item No.Item nameNormal condition
17Steering wheel angleNearly the same as the steering wheel operation angle (-750 to 750 deg)
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 3.
Replace the steering wheel sensor (column switch assembly) (Refer to ).
 
STEP 3. Check whether the diagnosis code is set again.
Check again if the diagnosis code is set in the FCM/LDW/AHB-ECU.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check if diagnosis code is set.
Is the diagnosis code set?
Replace the FCM/LDW/AHB-ECU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).