System Description
WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
Cooling Fan Control
| Sensor | Input Signal to ECM | ECM function | Actuator | ||||
|---|---|---|---|---|---|---|---|
| Crankshaft position sensor (POS) Camshaft position sensor (PHASE) |
Engine speed(1) | Cooling fan control | IPDM E/R (Cooling fan relays) | ||||
| Battery | Battery voltage(1) | ||||||
| Wheel sensor | Vehicle speed(2) | ||||||
| Engine coolant temperature sensor | Engine coolant temperature | ||||||
| Air conditioner switch | Air conditioner ON signal(2) | ||||||
| Refrigerant pressure sensor | Refrigerant pressure | ||||||
|
|||||||
The ECM controls the cooling fan corresponding to the vehicle speed, engine coolant temperature, refrigerant pressure, and air conditioner ON signal. The control system has 3-step control [HIGH/LOW/OFF].
Cooling Fan Operation
Cooling Fan Relay Operation
The ECM controls cooling fan relays in the IPDM E/R via the CAN communication line.
| Cooling fan speed | Cooling fan relay | |
| LO | HI | |
| Stop (OFF) | OFF | OFF |
| Low (LOW) | ON | OFF |
| High (HI) | ON | ON |