Inspection Procedure 1: Communication with the M.U.T.-III is not possible.

COMMENTS ON TROUBLE SYMPTOM

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.

POSSIBLE CAUSE

Malfunction of the A/C-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check that Engine-A/T-ECU communicates with the M.U.T.-III

Use the M.U.T.-III to confirm that it communicates with the engine-A/T-ECU.

Q. Is the check result normal?

	Go to Step 2.

	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>.

STEP 2. M.U.T.-III CAN bus diagnostics

Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?

	YES <LHD> : INSPECTION PROCEDURE 31: Refer to A/C-ECU power supply system <LHD> .

	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)> .

	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)> .

	NO : Repair the CAN bus line (Refer to GROUP 54F, Troubleshooting ).