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DTC U0126: SAS CAN timeout
 
 
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
  • Ignition switch is "ON" position.
Judgment Criterion
  • The signal sent from the steering wheel sensor cannot be received for 500 ms or more.
 
 
PROBABLE CAUSES
  • Malfunction of the CAN bus line
  • Malfunction of steering wheel sensor power supply circuit
  • Malfunction of the column switch assembly (Integrated with steering wheel sensor)
  • Malfunction of ACC/FCM-ECU

 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose CAN bus line.
(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 "ON" position.
(3) Diagnose the CAN bus line [Refer to GROUP 54C - Explanation About The Scan Tool (M.U.T.-IIISE) 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. Using scan tool (M.U.T.-IIISE), check the other system DTC.
Check whether an steering wheel sensor "time-out" related DTC is set in other ECUs [Refer to GROUP 54C - CAN Communication-Related DTC (U-Code) Table ].
Is DTC set?
Go to Step 3.
Go to Step 4.
 
STEP 3. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Is DTC U0126 set?
Replace the column switch assembly (Integrated with steering wheel sensor) (Refer to GROUP 35C - Steering Wheel Sensor ).
It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunction ).
 
STEP 4. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Is DTC U0126 set?
Replace the ACC/FCM-ECU (Refer to ).
It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunction ).