How To Proceed With Troubleshooting

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

HINT
Use these procedures to troubleshoot the air conditioning system.

1. VEHICLE BROUGHT TO WORKSHOP

NEXT -- Continue to next step.

2. INSPECT BATTERY VOLTAGE

Standard voltage:

10 to 14 V

If the voltage is below 11V, recharge or replace the battery before proceeding.

NEXT -- Continue to next step.

3. CHECK COMMUNICATION FUNCTION OF LARGE-SCALE BODY MULTIPLEX COMMUNICATION SYSTEM (BEAN)

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





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

4. CHECK CAN COMMUNICATION SYSTEM

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





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 DTC output in above, try to force output of the audio system DTC by simulating the operation indicated by the DTC.





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

6. PROBLEM SYMPTOMS TABLE





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 On-Vehicle Inspection

(e) Inspection

NEXT -- Continue to next step.

8. ADJUST, REPAIR OR REPLACE

NEXT -- END