How to Proceed With Troubleshooting

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual 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.

1. INSPECT BATTERY VOLTAGE
a. Inspect the battery voltage.

Standard Voltage:

11 to 14 V

b. 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 Manual Air Conditioning System)

Result:






B -- Go to step 8

A -- Continue to next step.

7. OVERALL ANALYSIS AND TROUBLESHOOTING*

a. Data List / Active Test Air Conditioning System (for Manual Air Conditioning System)

b. Terminals of ECU Air Conditioning System (for Manual Air Conditioning System)

c. On-vehicle Inspection

d. Inspection

NEXT -- Continue to next step.

8. ADJUST, REPAIR OR REPLACE

NEXT -- END