System Description

NOTE:

If DTC P1217 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
If DTC P1217 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer to DTC P0607 ECM .

Cooling Fan Control

SENSOR FUNCTION REFERENCE CHART

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-1, -2 and -3)
Cooling fan relays-4 and -5

Battery

Battery voltage⁽¹⁾

ABS actuator and electric unit (control unit)

Vehicle speed⁽²⁾

Combination meter

Engine coolant temperature sensor

Engine coolant temperature

Air conditioner switch

Air conditioner ON signal⁽²⁾

Refrigerant pressure sensor

Refrigerant pressure

⁽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.

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 4-step control [HIGH/MIDDLE/LOW/OFF].

Cooling Fan Operation

Models with A/C

Fig 1: Identifying Cooling Fan Operation Graphs (Models With A/C)

Courtesy of NISSAN MOTOR CO., U.S.A.

Models without A/C

Fig 2: Identifying Cooling Fan Operation Graphs (Models Without A/C)

Courtesy of NISSAN MOTOR CO., U.S.A.

Cooling Fan Relay Operation

The ECM controls cooling fan relays through CAN communication line.

COOLING FAN RELAY OPERATION CHART

Cooling fan speed	Cooling fan relay
Cooling fan speed	1	2	3	4	5
Stop (OFF)	OFF	OFF	OFF	OFF	OFF
Low (LOW)	OFF	OFF	OFF	ON	OFF
Middle (MID)	ON	OFF	OFF	OFF	ON
High (HI)	ON	ON	ON	OFF	ON