Infiniti QX56 (Z62). Manual - part 513

 

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Infiniti QX56 (Z62). Manual - part 513

 

 

EC-30

< SYSTEM DESCRIPTION >

[VK56VD]

COMPONENT PARTS

Knock Sensor

INFOID:0000000006217683

The knock sensor is attached to the cylinder block. It senses engine
knocking using a piezoelectric element. A knocking vibration from
the cylinder block is sensed as vibrational pressure. This pressure is
converted into a voltage signal and sent to the ECM.

Low Fuel Pressure Sensor

INFOID:0000000006217684

The low fuel pressure sensor is installed to low fuel pressure piping
and measures the low fuel pressure. The sensor transmits voltage
signal to the ECM. As the pressure increases, the voltage rises.

Low Pressure Fuel Pump

INFOID:0000000006217685

The low pressure fuel pump is integrated with a fuel pressure regula-
tor and a fuel filter. This pump is build into the fuel tank.
ECM controls the low pressure fuel pump via FPCM.

Malfunction Indicator Lamp (MIL)

INFOID:0000000006217686

The Malfunction Indicator Lamp (MIL) is located on the combination
meter.
The MIL will illuminate when the ignition switch is turned ON without
the engine running. This is a bulb check.
When the engine is started, the MIL should turn off. If the MIL
remains illuminated, the on board diagnostic system has detected an
engine system malfunction.
For details, refer to 

EC-51, "Diagnosis Description"

.

JSBIA0284ZZ

JSBIA0292ZZ

JPBIA3235ZZ

SEF217U

COMPONENT PARTS

EC-31

< SYSTEM DESCRIPTION >

[VK56VD]

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Manifold Absolute Pressure Sensor

INFOID:0000000006217687

The manifold absolute pressure (MAP) sensor is installed on the
intake manifold collector. Detects intake manifold pressure, and
transmits a voltage signal to the ECM.
The sensor uses a silicon diaphragm which is sensitive to the
change in pressure. As the pressure increases, the voltage rises.

Mass Air Flow Sensor (With Intake Air Temperature Sensor)

INFOID:0000000006217688

MASS AIR FLOW SENSOR

The mass air flow (MAF) sensor (1) is placed in the stream of intake
air. It measures the intake flow rate by measuring a part of the entire
intake flow. The mass air flow sensor controls the temperature of the
hot wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The greater air flow, the
greater the heat loss. 
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.

INTAKE AIR TEMPERATURE SENSOR

The intake air temperature (IAT) sensor is built-into the mass air flow sensor. The sensor detects intake air
temperature and transmits a signal to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical
resistance of the thermistor decreases in response to the rise in temperature.
<Reference data>

*: These data are reference values and are measured between ECM terminals.

Power Steering Pressure (PSP) Sensor

INFOID:0000000006217689

Power steering pressure (PSP) sensor is installed to the power steering high-pressure tube and detects a
power steering load.
This sensor is a potentiometer which transforms the power steering load into output voltage, and emits the
voltage signal to the ECM. The ECM controls the electric throttle control actuator and adjusts the throttle valve
opening angle to increase the engine speed and adjusts the idle speed for the increased load.

JMBIA0877ZZ

PBIA9559J

Intake air temperature

[

°

C (

°

F)]

Voltage*

(V)

Resistance

(k

)

25 (77)

3.3

1.94 - 2.06

80 (176)

1.2

0.293 - 0.349

SEF012P

EC-32

< SYSTEM DESCRIPTION >

[VK56VD]

COMPONENT PARTS

Refrigerant Pressure Sensor

INFOID:0000000006217690

The refrigerant pressure sensor is installed at the condenser of the air conditioner system. The sensor uses an
electrostatic volume pressure transducer to convert refrigerant pressure to voltage. The voltage signal is sent
to ECM, and ECM controls cooling fan system.

VVEL Actuator Motor

INFOID:0000000006217691

The VVEL actuator motor rotates the control shaft according to the control signal from the VVEL control mod-
ule. The VVEL control module judges whether the VVEL actuator motor controls the angle properly by the
VVEL control shaft position sensor signal.

VVEL Actuator Motor Relay

INFOID:0000000006217692

Power supply for the VVEL actuator motor is provided to the VVEL control module via VVEL actuator motor
relay. VVEL actuator motor relay is ON/OFF controlled by the VVEL control module. In addition, when the
VVEL actuator motor relay cannot be controlled by the VVEL control module for some reason, it ON/OFF con-
trolled by ECM.

VVEL Control Module

INFOID:0000000006217693

The VVEL control module consists of a microcomputer and connec-
tors for signal input and output and for power supply. The VVEL con-
trol module controls VVEL system.

VVEL Control Shaft Position Sensor

INFOID:0000000006217694

VVEL control shaft position sensor detects the control shaft position
angle.
A magnet is installed to the tip of the control shaft.
The magnetic field changes as the control shaft rotates. This
changes output voltage of the VVEL control shaft position sensor.
VVEL control module detects the actual position angle through the
voltage change and sends the signal to ECM.

PBIB2657E

JMBIA0879ZZ

JSBIA0466ZZ

STRUCTURE AND OPERATION

EC-33

< SYSTEM DESCRIPTION >

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STRUCTURE AND OPERATION

Positive Crankcase Ventilation

INFOID:0000000006217695

This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake
manifold.
During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the PCV
valve.
Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air.
The ventilating air is drawn from the air inlet tubes into the crankcase. In this process the air passes through
the hose connecting air inlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow through the valve.
The flow goes through the hose connection in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meet the requirement. This is because some of the flow will go
through the hose connection to the air inlet tubes under all condi-
tions.

PBIB0062E

PBIB1588E

 

 

 

 

 

 

 

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