How To Proceed With Troubleshooting
HEATING / 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. CUSTOMER PROBLEM ANALYSIS AND SYMPTOM CHECK
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3. INSPECT BATTERY VOLTAGE
(a) Measure the voltage of the battery.
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.
(b) Using the Techstream, inspect battery voltage reduction history by reading "Battery Voltage Lo Record" in the Data List Data List / Active Test.
NEXT -- 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 How to Proceed With Troubleshooting
A -- Continue to next step.
5. CHECK FOR DTC*
(a) Check for DTCs and note any codes that are output Reading and Clearing Diagnostic Trouble Codes.
(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(c) Based on the DTCs output above, try to force output of the air conditioning system DTC by simulating the conditions indicated by the DTC. Then recheck for DTCs Reading and Clearing Diagnostic Trouble Codes.
Result
B -- Go to DIAGNOSTIC TROUBLE CODE CHART Air Conditioning System
A -- Continue to next step.
6. PROBLEM SYMPTOMS TABLE
(a) Refer to Problem Symptoms Table Symptom Related Diagnostic Procedures.
Result
B -- Go to PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
A -- Continue to next step.
7. OVERALL ANALYSIS AND TROUBLESHOOTING*
(a) Terminals of ECU Pinout Values and Diagnostic Parameters
(b) Data List / Active Test Scan Tool Testing and Procedures
(c) On-vehicle Inspection
(d) Inspection
NEXT -- Continue to next step.
8. ADJUST, REPAIR OR REPLACE
NEXT -- Continue to next step.
9. CONFIRMATION TEST
NEXT -- END