Engine Cooling Fan Control Module
| Item | Description |
|---|---|
| 1 | Auxiliary electric cooling fan |
| 2 | Auxiliary electric cooling fan blades |
| 3 | Upper mounts (2 off) |
| 4 | Speed flaps |
| 5 | Electrical connection - Auxiliary electric cooling fan |
| 6 | Electrical connection - Main electric cooling fan |
| 7 | Main electric cooling fan blades |
| 8 | Main electric cooling fan |
| 9 | Lower mounts (2 off) |
| 10 | Electric cooling fan shroud |
There are 2 electric, variable speed cooling fans installed in a shroud attached to the rear of the radiator. The electric cooling fan is operated by a engine cooling fan control module, integrated into the electric motors. The Powertrain Control Module (PCM) uses a Pulse Width Modulation (PWM) signal to control the electric cooling fan. An electrical connector at the right side of the shroud provides the connection between the cooling fan harness and the vehicle wiring.
The engine cooling fan control module is provided with:
- A startup battery power supply from the Engine Junction Box (EJB).
- An ignition signal from the PCM relay in the EJB.
- A PWM signal from the PCM.
- A ground connection.
The PCM varies the duty cycle of the PWM signal between 0% and 100% to operate the electric cooling fan motor in 1 of 4 modes:
- Off.
- Minimum speed (750 Revolutions Per Minute (RPM)).
- Linear variable speed between minimum and maximum speeds.
- Maximum speed (2820 RPM).
The engine cooling fan control module incorporates a temperature sensor to prevent damage caused by excessive heat at high ambient temperatures. Operation of the engine cooling fan control module is discontinued if the temperature reaches 135°C (275°F). Operation resumes when the temperature decreases to 120°C (248°F).