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In case of this trouble symptom, the stability control/TCL system operation may be disabled. Diagnosis code may be set by the stability control/TCL system using M.U.T.-III.
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- Low battery output
- Wiring harness or connector failure of CAN bus line
- ASC-ECU malfunction
- Engine coding data problem
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Use M.U.T.-III to check the diagnosis code for the ASC system (Refer to ).
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Q.
Is the check result normal?
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Carry out the diagnosis for the diagnosis code (Refer to ).
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Using M.U.T.-III, check if any abnormality is present to the coding data below which are stored in the engine-ECU (Refer to GROUP 00 - Precautions before Service/Coding List).
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Q.
Is the check result normal?
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Perform the variant coding to the Engine ECU.
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Q.
Is the check result normal?
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Replace the engine ECU (Refer to GROUP 13A - Troubleshooting/Diagnosis function <4B1>, GROUP 13B - Troubleshooting/Diagnosis function <6B3> or Refer to GROUP 13D - Engine-ECU <4N1>). Then go to Step 5.
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Check that the brake tube is correctly mounted to the hydraulic unit (integrated with ASC-ECU).
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Q.
Is the check result normal?
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Replace the hydraulic unit (integrated with ASC-ECU). Then go to Step 5.
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Connect the brake tubes correctly, and repair or replace the external brake lines of the hydraulic unit (integrated with ASC-ECU).
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Q.
Does stability control/TCL operate normally?
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This diagnosis is complete.
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Check the brake system related components other than the stability control/TCL system.
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