Code No. U0428
SAS (CAN message)
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- If there is any
problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis,
diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table
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- Before replacing the ECU, ensure that the communication circuit is normal.
- When the steering wheel sensor is replaced, always carry out calibration to make
ASC-ECU learn the neutral point (Refer to ).
- When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out
the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to and ).
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OPERATION
The steering wheel sensor outputs the steering wheel status to ASC-ECU via the CAN bus
lines.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is stored when ASC-ECU has detected the communication error in the
steering wheel sensor.
PROBABLE CAUSES
- Malfunction of the steering wheel sensor
- Malfunction of the hydraulic unit assembly (integrated with ASC-ECU)
- Noise interference
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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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Q.
Is diagnosis code No. U0428 stored?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Check for diagnosis codes of other systems.
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Check if diagnosis code(s) other than U0428 is stored.
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Q.
Is the diagnosis code stored?
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Follow the relevant diagnosis code procedure, and then go to Step 6.
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Go to Step 4.
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STEP 4. Diagnosis code recheck
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Check again if the diagnosis code is stored.
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(1)Erase the stored diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. U0428 stored?
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Replace the steering wheel sensor (Refer to ). Then
go to Step 5.
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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 5. Diagnosis code recheck
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Check again if the diagnosis code is stored.
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(1)Erase the stored diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. U0428 stored?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
Then go to Step 6.
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This diagnosis is complete.
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STEP 6. Diagnosis code recheck
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Check again if the diagnosis code is stored.
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(1)Erase the stored diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. U0428 stored?
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Return to Step 3.
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This diagnosis is complete.
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