How To Proceed With Troubleshooting

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

HINT
* Use the following procedure to troubleshoot the air conditioning system.
* *: Use the Techstream.

1. VEHICLE BROUGHT TO WORKSHOP

NEXT -- Continue to next step.

2. INSPECT BATTERY VOLTAGE

(a) Inspect the battery voltage with the power switch off.

Standard Voltage:

11 to 14 V

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

NEXT -- Continue to next step.

3. 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.

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 code that is output.

(b) Clear the DTCs.

(c) Recheck for DTCs. Based on the DTCs output above, try to force the A/C system to output DTCs by simulating the conditions indicated by the DTC.

Result:





B -- Go to step 7
A -- Continue to next step.

6. DIAGNOSTIC TROUBLE CODE CHART

(a) Find the output code in Diagnostic Trouble Code Chart Air Conditioning System.

NEXT -- Go to step 9

7. PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table Symptom Related Diagnostic Procedures.

Result:





B -- Go to step 9
A -- Continue to next step.

8. OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Panel diagnosis (indicator check, sensor check) Diagnosis System

(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