Initial Inspection and Diagnostic Overview

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. INSPECT 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. INSPECT ELECTRIC POWER CONTROL SYSTEM*

(a) Using the Techstream, check the electric power control system's load control history Symptom Related Diagnostic Procedures.

NEXT -- Continue to next step.

4. CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*

(a) Use the Techstream to check if the LIN communication system is functioning normally.

Result





B -- GO TO LIN COMMUNICATION SYSTEM LIN Communication System
A -- Continue to next step.

5. 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.

6. CHECK FOR DTC*

(a) Check for DTCs and note any codes that are output.

(b) Delete the DTC.

(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 DTC CHART Air Conditioning
A -- Continue to next step.

7. PROBLEM SYMPTOMS TABLE

(a) Refer to the problem symptoms table Symptom Related Diagnostic Procedures.

Result





B -- GO TO STEP 9
A -- Continue to next step.

8. OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Actuator Check Air Conditioning System

(b) DATA LIST / ACTIVE TEST Scan Tool Testing and Procedures

(c) Terminals of ECU Pinout Values and Diagnostic Parameters

(d) On-vehicle Inspection

(e) Inspection

NEXT -- Continue to next step.

9. ADJUST, REPAIR OR REPLACE

NEXT -- END