Inspection and verification
1. Check the validity of the customer's complaint.
2. Visually inspect for any obvious mechanical or electrical damage.
Visual inspection table
|
Mechanical factors |
Electrical factors |
|
Drive belt |
Fuses. |
|
Refrigerant lines |
Wiring harness |
|
Condenser (refrigerator) |
Plug |
3. Before performing any further checks, REPAIR all obvious causes of problems found during the visual inspection.
4. If the problem still exists after visual inspection, REFER to the Symptom Chart and CONTINUE with the troubleshooting symptom.
Table of signs of malfunction
|
State |
Possible Causes |
Action |
|
•Air conditioning system does not work (heater fan OK) |
•Fuse(s) •Electrical circuit(s). •Amount of refrigerant. •Air conditioning compressor clutch •Dual pressure switch •Air conditioning compressor switch. •Wide Open Throttle (WOT) Air Conditioning Shutdown Relay. •Air conditioning compressor clutch diode •RSM •Heater control module. |
• Proceed to PINPOINT TEST A |
|
•The heater electric fan is partially/completely not working |
•Fuse(s) •Electrical circuit(s). •Electric heater fan •Heater fan switch. •Variable resistor for heater fan motor. |
• Proceed to PINPOINT TEST B |
|
•The heater electric fan operates continuously |
•Heater fan switch. •Electrical circuit(s). |
• Proceed to PINPOINT TEST C |
|
•Incorrect operation of the air recirculation flap |
•Electrical circuit(s). •Air recirculation damper •Electric motor for positioning the air recirculation flap. •Heater control module. |
• Proceed to PINPOINT TEST D |