Nissan Maxima. Manual - part 398

EC-76

< SYSTEM DESCRIPTION >

[VQ35DE]

CAN COMMUNICATION

CAN COMMUNICATION

System Description

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CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

Refer to 

LAN-7, "CAN Communication Control Circuit"

, about CAN communication for detail.

COOLING FAN CONTROL

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< SYSTEM DESCRIPTION >

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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

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].

JMBIA1905GB

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

Engine coolant temperature sensor

Engine coolant temperature

Refrigerant pressure sensor

Refrigerant pressure

Unified meter and A/C amp.

Air conditioner ON signal*

2

Vehicle speed*

2

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< SYSTEM DESCRIPTION >

[VQ35DE]

COOLING FAN CONTROL

Cooling Fan Operation

Cooling Fan Relay Operation

The ECM controls cooling fan relays in the IPDM E/R via the 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

COOLING FAN CONTROL

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< SYSTEM DESCRIPTION >

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Component Parts Location

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1.

Intake valve timing control solenoid 
valve (bank 1)

2.

Electronic controlled engine mount 
control solenoid valve

3.

Exhaust valve timing control magnet 
retarder (bank 2)

4.

Intake valve timing control solenoid 
valve (bank 2)

5.

Knock sensor (bank 1 and 2) 

6.

Fuel injector (bank 2)

7.

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

8.

Exhaust valve timing control position 
sensor (bank 2)

9.

Crankshaft position sensor (POS)

10. Engine coolant temperature sensor

11. Camshaft position sensor (PHASE) 

(bank 2)

12. Transmission range switch

13. Refrigerant pressure sensor

14. ECM

15. Battery current sensor

16. Condenser-2

17. EVAP canister purge volume control 

solenoid valve

18. Mass air flow sensor (with intake air 

temperature sensor)

19. Camshaft position sensor (PHASE) 

(bank 1)

20. EVAP service port

21. Power valve actuator 2

22. Electric throttle control actuator

23. Exhaust valve timing control position 

sensor (bank 1)

24. Ignition coil (with power transistor) and 

spark plug (bank 1)

25. Fuel injector (bank 1)

26. VIAS control solenoid valve 1 and 2

27. Power valve actuator 1

28. Exhaust valve timing control magnet 

retarder (bank 1)

29. Power steering pressure sensor

ALBIA0603ZZ