AIR CONDITIONING SYSTEM > HOW TO PROCEED WITH TROUBLESHOOTING

for Preparation Click here

HINT:

1. Use the following procedure to troubleshoot the air conditioning system.
   
2. *: Use the intelligent tester.
   

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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.
   

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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

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 (Click here)
A

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

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

NEXT.

Go to step 9

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

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

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