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:

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 MULTIPLEX COMMUNICATION SYSTEM (BEAN)*

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

Result:





B -- Go to MULTIPLEX COMMUNICATION SYSTEM
A -- 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
A -- Continue to next step.

5. 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 step 8
A -- Continue to next step.

6. PROBLEM SYMPTOMS TABLE

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) Actuator Check Actuator Check

(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.

8. ADJUST, REPAIR OR REPLACE

NEXT -- END