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 - Troubleshooting
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- When the steering wheel sensor is replaced, always carry out calibration to make ASTC-ECU learn the neutral point (Refer to ).
- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
- When the hydraulic unit assembly (integrated with ASTC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G sensor (Refer to ).
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OPERATION
The steering wheel sensor signal is sent to the ASTC-ECU via the CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
The ASTC-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 column switch assembly (Integrated with steering wheel sensor)
- Malfunction of the hydraulic unit assembly (integrated with ASTC-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 lines (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 column switch assembly (Integrated with steering wheel sensor) (Refer to GROUP 54A - Column Switch ). 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 ASTC-ECU) (Refer to ).
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This diagnosis is complete.
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