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.
| Symptom | Suspected Area | Link |
|---|---|---|
| Cooling fans do not operate | CAN communication system (for LHD with Central Gateway ECU) | |
| CAN communication system (for LHD without Central Gateway ECU) | ||
| CAN communication system (for RHD with Central Gateway ECU) | ||
| CAN communication system (for RHD without Central Gateway ECU) | ||
| Engine coolant temperature sensor | ||
| Cooling fan motor | ||
| No. 2 cooling fan motor | ||
| FAN NO. 1 relay | ||
| FAN NO. 2 relay | ||
| Cooling fan circuit | ||
| Cooling fan ECU | ||
| No. 2 Cooling fan ECU | ||
| ECM | ||
| Cooling fans do not stop (continue to operate) | CAN communication system (for LHD with Central Gateway ECU) | |
| CAN communication system (for LHD without Central Gateway ECU) | ||
| CAN communication system (for RHD with Central Gateway ECU) | ||
| CAN communication system (for RHD without Central Gateway ECU) | ||
| Engine coolant temperature sensor | ||
| Cooling fan circuit | ||
| Cooling fan ECU | ||
| No. 2 Cooling fan ECU | ||
| ECM | ||
| Cooling fan speed does not change | CAN communication system (for LHD with Central Gateway ECU) | |
| CAN communication system (for LHD without Central Gateway ECU) | ||
| CAN communication system (for RHD with Central Gateway ECU) | ||
| CAN communication system (for RHD without Central Gateway ECU) | ||
| Cooling fan circuit | ||
| Cooling fan ECU | ||
| No. 2 Cooling fan ECU | ||
| ECM |