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- The FCM-ECU has detected FCM control cancel signal.
- The FCM is disabled under any of the conditions:
- Transfer position: 4LLc
- Rear differential lock: ON
- Hill descent control: ON
- ASC: OFF
- Noise is detected.
- A malfunction may be present in the CAN bus line between the FCM-ECU and the ASTC-ECU
or the ASTC-ECU itself.
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- Wiring harness or connector failure of CAN bus line
- The ASTC system fails
- Malfunction of FCM-ECU
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Use M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Repair the CAN bus lines (Refer to GROUP 54C - Troubleshooting ).
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Use M.U.T.-III to check that the diagnosis code is set by the FCM-ECU.
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Q.
Is the diagnosis code set?
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Troubleshoot for the relevant diagnosis code (Refer to ).
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Use M.U.T.-III to check that the diagnosis code is set by the ASTC-ECU.
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Q.
Is the diagnosis code set?
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Carry out the diagnosis for the diagnosis code (Refer to ).
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Check that the FCM control operates normally.
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How
to Cope with Intermittent Malfunctions ).
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Replace the FCM-ECU (Refer to ).
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