Infiniti FX35, FX50 (S51). Manual - part 633

AUTOMATIC SPEED CONTROL DEVICE (ASCD)

EC-73

< SYSTEM DESCRIPTION >

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4.

EVAP canister

5.

EVAP control system pressure sen-
sor

: Vehicle front

1.

Fuel level sensor unit and fuel pump 
harness connector

2.

Fuel level sensor unit and fuel pump 3.

Fuel pressure regulator

4.

Fuel tank temperature sensor

: Vehicle front

1.

Accelerator pedal position sensor
(Without DCA system)

2.

Accelerator pedal position sensor
(With DCA system)

1.

Stop lamp switch

2.

ASCD brake switch (ASCD models)
ICC brake switch (ICC models)

3.

Brake pedal

4.

ECM

JMBIA1504ZZ

JMBIA1505ZZ

JMBIA1509ZZ

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< SYSTEM DESCRIPTION >

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AUTOMATIC SPEED CONTROL DEVICE (ASCD)

Component Description

INFOID:0000000005236713

1.

ICC steering switch

2.

CANCEL switch

3.

RESUME/ACCELERATE switch

4.

SET/COAST switch

5.

DISTANCE switch

6.

MAIN switch

7.

LDP/DCA switch

1.

ASCD steering switch

2.

CANCEL switch

3.

RESUME/ACCELERATE switch

4.

SET/COAST switch

5.

MAIN switch

1.

Snow mode switch

JSBIA0155ZZ

JSBIA0156ZZ

JMBIA1623ZZ

Component

Reference

ASCD brake switch

EC-422, "Description"

ASCD indicator

EC-463, "Description"

ASCD steering switch

EC-415, "Description"

Electric throttle control actuator

EC-393, "Description"

Stop lamp switch

EC-422, "Description"

CAN COMMUNICATION

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CAN COMMUNICATION

System Description

INFOID:0000000005236714

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.

EC-76

< SYSTEM DESCRIPTION >

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COOLING FAN CONTROL

COOLING FAN CONTROL

System Diagram

INFOID:0000000005236715

System Description

INFOID:0000000005236716

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 by 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 signal,
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

Engine speed*

1

Cooling fan 
control

IPDM E/R

↓

Cooling fan control module

↓

Cooling fan motor

Camshaft position sensor

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