Initial Inspection and Diagnostic Overview

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

HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
- Use these procedures to troubleshoot the air conditioning system.
- *: Use the intelligent tester or 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. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*
(a) Use the intelligent tester or Techstream to check if the CAN communication system is functioning normally.

Result





B -- GO TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.
4. CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*
(a) Use the intelligent tester or Techstream to check if the LIN communication system is functioning normally.

Result





B -- GO TO LIN COMMUNICATION SYSTEM
A -- Continue to next step.
5. CHECK FOR DTC*
(a) Check for DTCs DTC Check / Clear.
(b) Clear the DTC DTC Check / Clear.
(c) Based on the DTCs output above, try to force output of the A/C system DTC by simulating the operation indicated by the DTC. Recheck for DTCs.

Result





B -- GO TO DTC CHART
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) 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