How To Proceed With Troubleshooting

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

HINT
* Use these procedures to troubleshoot the air conditioning system.
* *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP

NEXT -- Continue to next step.

2. CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK

NEXT -- Continue to next step.

3. 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.

4. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Use the Techstream to check if the CAN Communication System is functioning normally.

Result





B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

5. CHECK FOR DTC*

(a) Check for DTCs and note any codes that are output Reading and Clearing Diagnostic Trouble Codes.

(b) Clear 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 8
A -- Continue to next step.

6. PROBLEM SYMPTOMS TABLE

(a) Refer to the Problem Symptoms Table Symptom Related Diagnostic Procedures.

Result





B -- Go to step 8
A -- Continue to next step.

7. 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.

8. ADJUST, REPAIR OR REPLACE

NEXT -- END