Infiniti QX56 (JA60). Manual - part 346

EC-36

< FUNCTION DIAGNOSIS >

[VK56DE]

COOLING FAN CONTROL

COOLING FAN CONTROL

Description

INFOID:0000000005149071

SYSTEM DESCRIPTION

Cooling Fan Control

*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.
*2: This signal is sent to ECM through CAN communication line.

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 2-step control [HI/OFF].

Cooling Fan Operation

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)

Battery

Battery voltage*

1

Wheel sensor

Vehicle speed*

2

Engine coolant temperature sensor

Engine coolant temperature

Air conditioner switch

Air conditioner ON signal*

2

Refrigerant pressure sensor

Refrigerant pressure

PBIB2060E

EVAPORATIVE EMISSION SYSTEM

EC-37

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EVAPORATIVE EMISSION SYSTEM

Description

INFOID:0000000005149072

SYSTEM DESCRIPTION

The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel

system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.

The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the

vapor is stored there when the engine is not operating or when refueling to the fuel tank.

The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the

engine is operating. EVAP canister purge volume control solenoid valve is controlled by ECM. When the

engine operates, the flow rate of vapor controlled by EVAP canister purge volume control solenoid valve is

proportionally regulated as the air flow increases.

EVAP canister purge volume control solenoid valve also shuts off the vapor purge line during decelerating and

idling.

PBIB1631E

EC-38

< FUNCTION DIAGNOSIS >

[VK56DE]

EVAPORATIVE EMISSION SYSTEM

EVAPORATIVE EMISSION LINE DRAWING

JMBIA1703GB

EVAPORATIVE EMISSION SYSTEM

EC-39

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JMBIA1702GB