Nissan Murano. Manual — part 491

EC-74

< SYSTEM DESCRIPTION >

[VQ35DE]

COOLING FAN CONTROL

COOLING FAN CONTROL

System Diagram

INFOID:0000000009719843

System Description

INFOID:0000000009719844

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

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].

JMBIA1857GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

1

Piston position

Cooling fan
control

IPDM E/R

↓

Cooling fan relay

↓

Cooling fan motor

Engine coolant temperature sensor

Engine coolant temperature

Refrigerant pressure sensor

Refrigerant pressure

Battery

Battery voltage*

1

Combination meter

Vehicle speed*

2

BCM

Air conditioner ON signal*

2

COOLING FAN CONTROL

EC-75

< SYSTEM DESCRIPTION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Cooling Fan Operation

Cooling Fan Relay Operation

The ECM controls cooling fan relays in the IPDM E/R through CAN communication line.

JMBIA0179GB

Cooling fan speed

Cooling fan relay

1

2

3

Stop (OFF)

OFF

OFF

OFF

Low (LOW)

ON

OFF

OFF

Middle (MID)

OFF

ON

OFF

High (HI)

OFF

ON

ON

EC-76

< SYSTEM DESCRIPTION >

[VQ35DE]

COOLING FAN CONTROL

Component Parts Location

INFOID:0000000009719845

1.

Intake valve timing control solenoid
valve (bank 1)

2.

Intake valve timing control solenoid
valve (bank 2)

3.

Electronic controlled engine mount
control solenoid valve

4.

Fuel injector (bank 2)

5.

A/F sensor 1 (bank 2)

6.

Cooling fan motor-2

7.

Ignition coil (with power transistor)
and spark plug (bank 2)

8.

Camshaft position sensor (PHASE)
(bank 2)

9.

Crankshaft position sensor (POS)

10. Engine coolant temperature sensor

11.

Cooling fan motor-1

12. ECM

13. Refrigerant pressure sensor

14. Battery current sensor

15. IPDM E/R

16. Mass air flow sensor (with intake air

temperature sensor)

17. Electric throttle control actuator

18. EVAP service port

19. Power valve actuator 2

20. EVAP canister purge volume control

solenoid valve

21. Camshaft position sensor (PHASE)

(bank 1)

22. Ignition coil (with power transistor)

and spark plug (bank 1)

23. A/F sensor 1 (bank 1)

24. Fuel injector (bank 1)

25. VIAS control solenoid valve 1 and 2

26. Power valve actuator 1

JMBIA1108ZZ

COOLING FAN CONTROL

EC-77

< SYSTEM DESCRIPTION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

1.

Mas air flow sensor (with intake air
temperature sensor)

2.

Electric throttle control actuator

: Vehicle front

1.

Ignition coil (with power transistor)
and spark plug (bank 1)

2.

Fuel injector (bank 1)

3.

Fuel injector (bank 2)

4.

Ignition coil (with power transistor)
and spark plug (bank 2)

5.

Knock sensor (bank 2)

6.

Knock sensor (bank 1)

: Vehicle front

1.

Crankshaft position sensor (POS)

2.

Camshaft position sensor (PHASE)
(bank 1)

3.

Camshaft position sensor (PHASE)
(bank 2)

: Vehicle front

JMBIA1109ZZ

JMBIA1110ZZ

JMBIA1114ZZ