System Description
ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pressure, air conditioner ON signal. Then control system has 3-step control [HIGH/LOW/OFF].
COOLING FAN OPERATION
COOLING FAN RELAY OPERATION
The ECM controls cooling fan relays through CAN communication line.
| Cooling fan speed | Cooling fan low relay | Cooling fan high relay | Cooling fan relay |
|---|---|---|---|
| Stop (OFF) | OFF | OFF | OFF |
| Low (LOW) | ON | OFF | OFF |
| High (HI) | ON | ON | ON |