Code No. U0126 SAS CAN timeout

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.
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.

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 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 power supply circuit
Malfunction of the steering wheel sensor (column switch assembly)
Malfunction of the FCM/LDW/AHB-ECU

DIAGNOSIS PROCEDURE

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

STEP 2. M.U.T.-III other system diagnosis code.

Check if the diagnosis code No. U0126 is set to other ECU.

Q. Is the diagnosis code set?

Go to Step 3.

Go to Step 4.

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.

Q. Is the diagnosis code set?

Replace the steering wheel sensor (column switch assembly) (Refer to GROUP 54A - Column Switch

The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction).

STEP 4. 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.

Q. 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).