AIR CONDITIONING SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

VEHICLE BROUGHT TO WORKSHOP

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INSPECT AUXILIARY BATTERY VOLTAGE

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

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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 (for LHD)	B
   CAN DTC is output (for RHD)	C

   
   

   B

   GO TO CAN COMMUNICATION SYSTEM Click here

   C

   GO TO CAN COMMUNICATION SYSTEM Click here

   A

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 Click here

   A

CHECK FOR DTC*

1. Check for DTCs Click here.

2. Clear the DTC Click here.

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

   Result

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

   
   

   B

   GO TO DTC CHART Click here

   A

PROBLEM SYMPTOMS TABLE

1. Refer to the 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

   
   

   NEXT

ADJUST, REPAIR OR REPLACE

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