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 to the next step.

   
   

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CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*

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

   Result
   Result Proceed to LIN DTCs are not output A LIN DTCs are output B

   
   

   B

   GO TO LIN COMMUNICATION SYSTEM Click here

   A

CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

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

   Result
   Result Proceed to CAN DTCs are not output A CAN DTCs are output B

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM Click here

   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 DTCs are not output A DTCs are 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. Panel diagnosis (indicator check) Click here

2. Panel diagnosis (sensor check) Click here

3. Panel diagnosis (actuator check) Click here

4. Data List / Active Test Click here

5. Terminals of ECU Click here

6. On-vehicle Inspection

7. Inspection

   
   

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ADJUST, REPAIR OR REPLACE

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