Nissan Cube. Manual - part 297

EC-74

< SYSTEM DESCRIPTION >

[MR18DE]

COOLING FAN CONTROL

COOLING FAN CONTROL

System Diagram

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System Description

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INPUT/OUTPUT SIGNAL CHART

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

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

SYSTEM DESCRIPTION

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

JMBIA1324GB

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 relay

↓

Cooling fan motor

Battery

Battery voltage*

1

ABS actuator and electric unit (control unit)

Vehicle speed*

2

Engine coolant temperature sensor

Engine coolant temperature

BCM

Air conditioner ON signal*

2

Refrigerant pressure sensor

Refrigerant pressure

COOLING FAN CONTROL

EC-75

< SYSTEM DESCRIPTION >

[MR18DE]

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Cooling Fan Operation

Cooling Fan Relay Operation

The ECM controls cooling fan relays via the CAN communication line.

PBIB2483E

Cooling fan speed

Cooling fan relay

1

2

3

Stop (OFF)

OFF

OFF

OFF

Low (LOW)

ON

OFF

OFF

High (HI)

ON

ON

ON

EC-76

< SYSTEM DESCRIPTION >

[MR18DE]

COOLING FAN CONTROL

Component Parts Location

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1.

Ignition coil (with power transistor) 
and spark plug

2.

Intake valve timing control solenoid 
valve

3.

Fuel injector

4.

Refrigerant pressure sensor

5.

Knock sensor

6.

Camshaft position sensor (PHASE)

7.

Engine coolant temperature sensor

8.

Cooling fan motor

9.

Battery current sensor

10. IPDM E/R

11.

ECM

12. Mass air flow sensor (with intake air 

temperature sensor)

13. Electric throttle control actuator

(with built in throttle position sensor 
and throttle control motor)

14. EVAP canister purge volume control 

solenoid valve

JMBIA2296ZZ

COOLING FAN CONTROL

EC-77

< SYSTEM DESCRIPTION >

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1.

ECM

2.

IPDM E/R

3.

Fuel pump fuse (15 A)

Vehicle front

1.

Electric throttle control actuator
(with built-in position sensor, throttle 
control motor)

2.

Throttle valve

Vehicle front

1.

Battery current sensor

2.

Mass air flow sensor
(with Intake air temperature sensor)

Vehicle front

JMBIA2297ZZ

JMBIA2298ZZ

JMBIA2299ZZ

JMBIA2300ZZ