Code No. U0126:
SAS CAN Timeout
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- 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 (Refer to GROUP 54C - CAN Bus Diagnostics Table
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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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OPERATION
The EPS-ECU communicates with the steering wheel sensor via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
If the EPS-ECU cannot receive any signal from the steering wheel sensor for a predetermined period,
this diagnosis code will be set.
PROBABLE CAUSES
- The CAN bus line is defective
- Malfunction of the steering wheel sensor
- Malfunction of the EPS-ECU
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STEP 1. M.U.T.-III CAN bus diagnosis.
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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 Go to Step 3.
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 Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
On completion, go to Step 2.
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STEP 2. Diagnosis code recheck after resetting CAN bus lines.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. U0126 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Check other diagnosis codes.
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Check if diagnosis code(s) other than U0126 is set.
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Q.
Is the diagnosis code set?
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Perform troubleshooting for the relevant diagnosis code (Refer to ).
Then go to Step 6.
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Go to Step 4.
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STEP 4. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check whether a steering wheel sensor "time-out" related diagnosis code is set in other
ECUs.
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Q.
Is the diagnosis code set?
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Replace the steering wheel sensor (Refer to GROUP 35C - Steering Wheel
Sensor ). Then go to Step 6.
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Go to Step 5.
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STEP 5. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. U0126 set?
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Replace the EPS-ECU. Then go to Step 6.
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction).
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STEP 6. Check whether the diagnosis code is set again.
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Check again if the diagnosis code is set.
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(1)Erase the diagnosis code.
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(2)Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
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(3)Check if the diagnosis code is set.
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Q.
Is diagnosis code No. U0126 set?
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Return to Step 1.
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This diagnosis is complete.
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