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DTC U0126: SAS CAN Timeout
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code 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 steering wheel sensor is replaced, calibrate the steering wheel sensor (Refer to GROUP 35C - On-vehicle Service ).
 
 
OPERATION
ACC-ECU communicates with the steering wheel sensor via the CAN bus lines.
 
 
DIAGNOSTIC TROUBLE CODE SET CONDITION
This diagnostic trouble code is set when the abnormality below is detected:
  • The signal sent from the steering wheel sensor cannot be received for a certain period.
 
 
PROBABLE CAUSES
  • Malfunction of the CAN bus line
  • Malfunction of the steering wheel sensor
  • Malfunction of ACC-ECU

 
 
DIAGNOSIS
STEP 1. Diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line. (Refer to GROUP 54C - Explanation About The Scan Tool (M.U.T.-III) Can Bus Diagnostics )
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the check result normal?
Go to Step 2
Repair the CAN bus lines (Refer to GROUP 54C - Diagnosis, Can Bus Diagnostics Table ).
 
STEP 2. Scan tool (M.U.T.-III) other system diagnostic trouble code.
Check the ASC diagnostic trouble code (Refer to GROUP 35C - Diagnosis, Diagnostic Trouble Code Chart ).
Is the diagnostic trouble code set?
Perform the relevant troubleshooting.
Go to Step 3
 
STEP 3. Scan tool (M.U.T.-III) other system diagnostic trouble code.
Check if diagnostic trouble code No. U0126 is set in other ECU.
Is diagnostic trouble code set?
Replace the steering wheel sensor (Refer to GROUP 35C - Steering Wheel Sensor ).
Go to Step 4
 
STEP 4. Check whether the diagnostic trouble code is set again.
Is diagnostic trouble code No.U0126 set?
Replace the ACC-ECU (Refer to ).
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).