How To Proceed With Troubleshooting

AIR CONDITIONING: AIR CONDITIONING SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
- Use the following procedures to troubleshoot the air conditioning system.
- *: Use an intelligent tester or Techstream.

1. VEHICLE BROUGHT TO WORKSHOP
NEXT -- Continue to next step.
2. INSPECT BATTERY VOLTAGE
(a) Inspect the battery voltage.
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery before proceeding.
NEXT -- Continue to next step.
3. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*
(a) Use an intelligent tester or Techstream to check if the CAN Communication System is functioning normally.
Result:






B -- Go to CAN COMMUNICATION SYSTEM
A -- Continue to next step.
4. CHECK FOR DTC*
(a) Check for DTCs and note any codes that are output.
HINT: Refer to the DTC CHECK / CLEAR Reading and Clearing Diagnostic Trouble Codes.
(b) Delete the DTCs.
(c) Recheck for DTCs. Based on the DTCs output above, try to force output of the A/C system DTC by simulating the operation indicated by the DTC.
Result:






B -- Go to step 7
A -- Continue to next step.
5. PROBLEM SYMPTOMS TABLE
(a) Refer to the PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures.
Result:






B -- Go to step 7
A -- Continue to next step.
6. OVERALL ANALYSIS AND TROUBLESHOOTING*
(a) DATA LIST / ACTIVE TEST Scan Tool Testing and Procedures

(b) TERMINALS OF ECU Pinout Values and Diagnostic Parameters

(c) ON-VEHICLE INSPECTION
(d) INSPECTION
NEXT -- Continue to next step.
7. ADJUST, REPAIR OR REPLACE
NEXT -- END