Tech Tips
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | Link |
|---|---|---|
| Cooling fans does not operate | Engine coolant temperature sensor | |
| Cooling fan motor | ||
| No. 2 cooling fan motor | ||
| FAN NO. 1 relay | ||
| FAN NO. 2 relay | ||
| FAN NO. 3 relay | ||
| Cooling fan circuit | ||
| ECM | ||
| Cooling fans does not stop (continue to operate) | Engine coolant temperature sensor | |
| Cooling fan circuit | ||
| FAN NO. 1 relay | ||
| FAN NO. 2 relay | ||
| FAN NO. 3 relay | ||
| Cooling fan motor | ||
| No. 2 cooling fan motor | ||
| ECM | ||
| Cooling fans speed does not change | FAN NO. 2 relay | |
| Cooling fan circuit | ||
| ECM |