AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) HOW TO PROCEED WITH TROUBLESHOOTING

VEHICLE BROUGHT TO WORKSHOP

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CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK

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INSPECT BATTERY VOLTAGE

1. Measure the voltage of the battery.

   Standard voltage
   11 to 14 V

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

2. w/ PTC Heater:

   Using the intelligent tester, inspect battery voltage reduction history "Battery Voltage Lo Record" in the Data List Click here.

   
   

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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	B

   
   

   B

   Go to CAN COMMUNICATION SYSTEM Click here

   A

CHECK PANEL DIAGNOSIS

1. Check panel diagnosis Click here.

   
   

   1. Indicator Check

   2. Sensor Check

   
   

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CHECK FOR DTC*

1. Check for DTCs and note any codes that are output Click here.

2. Clear the DTCs Click here.

3. Based on the DTCs output above, try to force output of the air conditioning system DTC by simulating the conditions indicated by the DTC. Then recheck for DTCs.

   Result

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

   
   

   B

   Go to DIAGNOSTIC TROUBLE CODE 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 9

   A

OVERALL ANALYSIS AND TROUBLESHOOTING*

1. Terminals of ECU Click here

2. Data List / Active Test Click here

3. On-vehicle Inspection

4. Inspection

   
   

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ADJUST, REPAIR OR REPLACE

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CONFIRMATION TEST

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