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 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
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
A -- Continue to next step.

6. CHECK FOR DTC* CAN Communication System
(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 System
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 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.

9. ADJUST, REPAIR OR REPLACE
NEXT -- END