AIR CONDITIONING SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

VEHICLE BROUGHT TO WORKSHOP

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INSPECT BATTERY VOLTAGE

1. Inspect the battery voltage.

   Standard Voltage
   11 to 14 V

   If the voltage is below 11 V, recharge or replace the battery before proceeding.

   
   
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CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*

1. Use the intelligent tester to check if the LIN communication system is functioning normally.

   Result
   Result Proceed to LIN DTC is not output A LIN DTC is output B

   
   
   • B
   • GO TO LIN COMMUNICATION SYSTEM
   • A

CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

1. Use the intelligent tester to check if the CAN communication system is functioning normally.

   Result
   Result Proceed to CAN DTC is not output A CAN DTC is output B

   
   
   • B
   • GO TO CAN COMMUNICATION SYSTEM
   • A

CHECK FOR DTC*

1. Check for DTCs and note any code that is output.

2. Clear the DTCs.

3. Recheck for DTCs. Based on the DTCs output above, try to force the A/C system to output DTCs by simulating the conditions indicated by the DTC.

   Result
   Result Proceed to DTC is not output A DTC is output B

   
   
   • B
   • Go to step 8
   • A

PROBLEM SYMPTOMS TABLE

1. Refer to Problem Symptoms Table (Click here).

   Result
   Result Proceed to Fault is not listed in Problem Symptoms Table A Fault is listed in Problem Symptoms Table B

   
   
   • B
   • Go to step 8
   • A

OVERALL ANALYSIS AND TROUBLESHOOTING*

1. Actuator Check (Click here)

2. Data List / Active Test (Click here)

3. Terminals of ECU (Click here)

4. On-vehicle Inspection

5. Inspection

   
   
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ADJUST, REPAIR OR REPLACE

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• END