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COMBINATION METER CHASSIS ELECTRICAL 54A-45 DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnostics Q: Is the check result normal? YES : Go to Step 2. NO : Repair the CAN bus line (Refer to GROUP − Troubleshooting ). Repair the CAN bus line and go to Step 6. STEP 2. M.U.T.-III other system diagnosis code Q: Is the diagnosis code set? YES : Troubleshoot the A/C-ECU (Refer to GROUP 55B − Troubleshooting ). NO : Go to Step 3. STEP 3. M.U.T.-III other system diagnosis code • Code No. U0164: A/C CAN timeout/Not equipped Q: Is the diagnosis code set? YES : Go to Step 4. NO : Go to Step 5. STEP 4. Check whether the diagnosis code is not reset. Q: Is the diagnosis code set? YES : Replace A/C-ECU and then go to Step 6. NO : A poor connection, open circuit or other STEP 5. Check whether the diagnosis code is not reset. Q: Is the diagnosis code set? YES : Replace combination meter and then go to Step 6. NO : A poor connection, open circuit or other STEP 6. Check whether the diagnosis code is not reset. Q: Is the diagnosis code set? YES : Go to Step 1. NO : The procedure is complete. Code No.U0168 WCM/KOS CAN timeout CAUTION • If diagnosis code No. U0168 is set, be sure to diagnose the CAN bus line. • Before replacing the ECU or combination meter, ensure that the power supply circuit, DIAGNOSTIC FUNCTION If the signal from KOS-ECU cannot be received, the JUDGEMENT CRITERIA With the ignition switch is at ON position, the diagno- PROBABLE CAUSES • Malfunction of CAN bus line • Malfunction of the KOS-ECU • Malfunction of combination meter |