How To Proceed With Troubleshooting

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

HINT
* Use the following procedures to troubleshoot the air conditioning system.
* *: Use a 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

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

Result:





B -- Go to CAN COMMUNICATION SYSTEM Problem Symptoms Table
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