Code No. U1200
SAS parity error
Code No. U1204 SAS message counter error
caution |
- 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
).
- Whenever ECU is replaced, ensure that the CAN bus lines are 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 signal is sent to the ASC-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
If a problem is found in the steering wheel sensor, the sensor will send a diagnostic
signal to the ASC-ECU. When ASC-ECU receives this diagnostic signal, it determines that the
sensor has a trouble and stores the diagnosis code.
PROBABLE CAUSES
- The CAN bus line is defective.
- Malfunction of the steering wheel sensor
- Malfunction of the hydraulic unit assembly (integrated with ASC-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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Q.
Is diagnosis code No. U1200 or U1204 stored?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Check whether the diagnosis code is stored again.
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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. U1200 or U1204 stored?
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Replace the steering wheel sensor (Refer to ).
Then go to Step 4.
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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 4. Check whether the diagnosis code is stored again.
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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. U1200 or U1204 stored?
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Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then
go to Step 5.
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This diagnosis is complete.
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STEP 5. Check whether the diagnosis code is stored again.
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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. U1200 or U1204 stored?
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Return to Step 3.
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This diagnosis is complete.
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