Infiniti FX35, FX50 (S51). Manual - part 775

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC-641

< SYSTEM DESCRIPTION >

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Component Description

INFOID:0000000005237187

Component

Reference

ASCD steering switch

EC-1041, "Description"

ASCD brake switch

EC-1048, "Description"

Stop lamp switch

EC-1048, "Description"

Electric throttle control actuator

EC-1018, "Description"

ASCD indicator

EC-1095, "Description"

EC-642

< SYSTEM DESCRIPTION >

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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-30, "CAN Communication Signal Chart"

, about CAN communication for detail.

COOLING FAN CONTROL

EC-643

< SYSTEM DESCRIPTION >

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COOLING FAN CONTROL

System Diagram

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System Description

INFOID:0000000005237190

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, air conditioner
ON signal, refrigerant pressure, target A/C evaporator temperature and A/C evaporator temperature.
Cooling fan control signal is sent to IPDM E/R from ECM via the CAN communication line. Then, IPDM E/R
sends ON/OFF pulse duty signal to cooling fan control module. Corresponding to this ON/OFF pulse duty sig-
nal, cooling fan control module gives cooling fan motor operating voltage to cooling fan motors. Cooling fan
speed is controlled by duty cycle of cooling fan motor operating voltage sent from cooling fan control module.

JMBIA1529GB

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor
Camshaft position sensor

Engine speed*

1

Cooling fan control

IPDM E/R

↓

Cooling fan control module

↓

Cooling fan motor

Engine coolant temperature sensor

Engine coolant temperature

Refrigerant pressure sensor

Refrigerant pressure

Battery

Battery voltage*

1

Unified meter and A/C amp.

Vehicle speed*

2

Air conditioner ON signal*

2

A/C evaporator temperature*

2

Target A/C evaporator temperature*

2

EC-644

< SYSTEM DESCRIPTION >

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COOLING FAN CONTROL

Component Parts Location

INFOID:0000000005589023

1.

IPDM E/R

2.

VVEL control module

3.

Battery current sensor

4.

VVEL actuator motor relay

5.

Cooling fan relay-1

6.

Cooling fan relay-2

7.

Mass air flow sensor (bank 2)

8.

Refrigerant pressure sensor

9.

Exhaust valve timing control position 
sensor (bank 2)

10. Exhaust valve timing control sole-

noid valve (bank 2)

11.

Camshaft position sensor (bank 2)

12. Intake valve timing control solenoid 

valve (bank 2)

13. Cooling fan motor-1

14. Cooling fan control module-1

15. Cooling fan motor-2

16. Cooling fan control module-2

17. Intake valve timing control solenoid 

valve (bank 1)

18. Camshaft position sensor (bank 1)

19. Exhaust valve timing control sole-

noid valve (bank 1)

20. Exhaust valve timing control position 

sensor (bank 1)

21. Mass air flow sensor (with intake air 

temperature sensor) (bank 1)

22. ICC brake hold relay (ICC models)

23. Brake booster pressure sensor

24. Ignition coil (with power transistor) 

and spark plug (bank 1)

25. VVEL actuator motor (bank 1)

26. VVEL control shaft position sensor 

(bank 1)

27. Fuel injector (bank 1)

28. Electric throttle control actuator 

(bank 1)

29. A/F sensor 1 (bank 1)

30. Knock sensor (bank 1)

JMBIA1535ZZ