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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 can not 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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Use the M.U.T.-III to confirm that it
communicates with the engine-A/T-ECU.
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Q.
Is the check result normal?
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Diagnose the MPI system. Refer to
GROUP 13A - Troubleshooting <Except vehicles for Hong
Kong and Singapore> or GROUP 13B - Troubleshooting <Vehicles for Hong Kong
and Singapore>.
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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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YES <LHD> : INSPECTION PROCEDURE
31: Refer to A/C-ECU power supply system <LHD> .
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YES <RHD (Except vehicles for Hong Kong
and Singapore)> : INSPECTION PROCEDURE 32: Refer to A/C-ECU
power supply system <RHD (Except vehicles for Hong Kong and
Singapore)> .
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YES <RHD (Vehicles for Hong Kong and
Singapore)> : INSPECTION PROCEDURE 33: Refer to A/C-ECU power
supply system <RHD (Vehicles for Hong Kong and Singapore)> .
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NO : Repair the CAN bus line (Refer to GROUP
54F, Troubleshooting ).
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