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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- Whenever ECU is replaced, ensure that the CAN bus lines are normal.
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OPERATION
The steering wheel sensor signal is sent to the EPS-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 EPS-ECU. When EPS-ECU receives this diagnostic signal, it determines that the sensor has a trouble and sets the diagnosis code.
PROBABLE CAUSES
- The CAN bus line is defective.
- Malfunction of the steering wheel sensor
- Malfunction of 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. 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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(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. U1200 or U1204 set?
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Replace the steering wheel sensor (Refer to GROUP 35C - Steering Wheel Sensor ). 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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(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. U1200 or U1204 set?
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Replace the EPS-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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(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. U1200 or U1204 set?
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Return to Step 1.
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This diagnosis is complete.
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