How to Proceed with Troubleshooting

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): HOW TO PROCEED WITH TROUBLESHOOTING

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.
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 8
A -- Continue to next step.

6. PROBLEM SYMPTOMS TABLE
(a) Refer to Problem Symptoms Table Air Conditioning System (For Automatic Air Conditioning System).
Result:





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

7. OVERALL ANALYSIS AND TROUBLESHOOTING*
(a) Panel diagnosis (indicator check) Diagnosis System
(b) Panel diagnosis (sensor check) Diagnosis System
(c) Panel diagnosis (actuator check) Actuator Check
(d) Data List / Active Test Air Conditioning System (for Automatic Air Conditioning System)
(e) Terminals of ECU Air Conditioning System (for Automatic Air Conditioning System)
(f) On-vehicle Inspection
(g) Inspection
NEXT -- Continue to next step.

8. ADJUST, REPAIR OR REPLACE
NEXT -- END