AIR CONDITIONING SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

VEHICLE BROUGHT TO WORKSHOP

NEXT

INSPECT BATTERY VOLTAGE

1. Inspect the battery voltage with the power switch off.

   Standard Voltage
   11 to 14 V

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

   
   

   NEXT

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 Click here

   
   

   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 Click here

   
   

   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 output A DTC is not output B

   
   

   B

   Go to step 7

   A

DIAGNOSTIC TROUBLE CODE CHART

1. Find the output code in Diagnostic Trouble Code Chart Click here.

   
   

   NEXT

   Go to step 9

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 9

   A

OVERALL ANALYSIS AND TROUBLESHOOTING*

1. Panel diagnosis (indicator check, sensor check) Click here

2. Data List / Active Test Click here

3. Terminals of ECU Click here

4. On-vehicle Inspection

5. Inspection

   
   

   NEXT

ADJUST, REPAIR OR REPLACE

NEXT