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If communication with all other systems is not possible, there is a high possibility that
there is a malfunction of the diagnosis line. If only the A/C system cannot communicate
with the M.U.T.-III, the A/C-ECU may be defective.
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- Malfunction of the A/C-ECU
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Check that the M.U.T.-III communicates with the engine-ECU when the M.U.T.-III is operated.
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Q.
Is the check result normal?
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Diagnose the MPI system. Refer to GROUP 13C, Troubleshooting .
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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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Refer to Inspection Procedure 10 "Malfunction of the A/C-ECU power supply
system ."
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Repair the CAN bus line (Refer to GROUP 54C, Troubleshooting ).
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