Code No. U1211: ENG Parity/Toggle bit 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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- 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
Engine-related signals are sent or received to and from between ASTC-ECU and engine-ECU via CAN bus lines.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set when the ASTC-ECU has detected an abnormal engine-related signal.
PROBABLE CAUSES
- Malfunction of ETACS-ECU
- The CAN bus line is defective.
- Malfunction of engine-ECU
- 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. U1211 set?
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Go to Step 3.
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This diagnosis is complete.
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STEP 3. Use M.U.T.-III to confirm a diagnosis code of other systems.
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Check if the diagnosis code is set in the engine-ECU (Refer to GROUP 13B - Diagnosis Code Chart <6B3> or GROUP 13C - Diagnosis Code Chart <4N1>).
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Q.
Is the diagnosis code set?
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Troubleshoot the engine-ECU diagnosis code. Then go to Step 5.
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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 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. U1211 set?
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Replace the engine-ECU (Refer to GROUP 13B - Engine-ECU <6B3> or GROUP 13C - Engine-ECU <4N1>). Then go to Step 5
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This diagnosis is complete.
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STEP 5. Diagnosis code recheck
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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. U1211 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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