Code No. U1200:
SAS parity error
Code No. U1204: SAS message counter error
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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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- When the steering wheel sensor is replaced, always carry out calibration to make
ASC-ECU learn the neutral point (Refer to ).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out
the calibration of the G and yaw rate sensor and the steering wheel 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
The ASC-ECU will set a diagnosis code when it receives an unfeasible signal from the steering
wheel sensor.
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 set?
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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 set again.
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Check again if the diagnosis code is set.
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(1)Erase the set diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. U1200 or U1204 set?
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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 set again.
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Check again if the diagnosis code is set.
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(1)Erase the set diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. U1200 or U1204 set?
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Replace the hydraulic unit assembly (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 set again.
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Check again if the diagnosis code is set.
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(1)Erase the set diagnosis code.
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(2)Ignition switch: "LOCK" (OFF)
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Q.
Is diagnosis code No. U1200 or U1204 set?
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Return to Step 3.
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This diagnosis is complete.
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