Nissan Versa (N17): Cooling fan control

Nissan Versa 2nd generation (N17) Service Manual / Engine / Engine control system (EC) / Cooling fan control

Cooling fan control : system diagram

COOLING FAN CONTROL : System Diagram

Cooling fan control : system description

INPUT/OUTPUT SIGNAL CHART

Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor (POS) Camshaft position sensor (PHASE) Engine speed*1 Piston position Cooling fan speed request signal IPDM E/R ↓ Cooling fan relay ↓ Cooling fan motor
Engine coolant temperature sensor Engine coolant temperature
Battery Battery voltage*1
Refrigerant pressure sensor Refrigerant pressure
Combination meter Vehicle speed signal*2
BCM A/C ON signal*2 Blower fan signal*2

*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.

*2: This signal is sent to ECM through CAN communication line.

SYSTEM DESCRIPTION (EXCEPT FOR SINGLE CONNECTOR COOLING FAN WITHOUT A/C)

ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pressure, air conditioner ON signal. Then control system has 3step control [HIGH/LOW/OFF].

Cooling Fan Operation

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

SYSTEM DESCRIPTION (FOR SINGLE CONNECTOR COOLING FAN WITHOUT A/C)

ECM controls cooling fan speed corresponding to vehicle speed, engine coolant temperature, refrigerant pressure, air conditioner ON signal. Then control system has 2step control [HIGH/OFF].

Cooling Fan Operation

Cooling Fan Operation

Cooling Fan Relay Operation

The ECM controls cooling fan relays through CAN communication line.

Cooling fan speed Cooling fan low relay
Stop (OFF) OFF
Operate (HI) ON

Air conditioning cut control

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Other materials:

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Inspection Warm up engine and then turn it off. Release fuel pressure. Remove ignition coil and spark plug from each cylinder. Connect engine tachometer (not required in use of CONSULT). Install compression gauge (B) with an adapter (A) (commercial service tool) onto spark plug hole. ...

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