Nissan Quest E52. Manual - part 453

EC-22

< SYSTEM DESCRIPTION >

[VQ35DE]

COMPONENT PARTS

Camshaft Position Sensor (PHASE)

INFOID:0000000009650928

The camshaft position sensor (PHASE) senses the retraction of
intake camshaft to identify a particular cylinder. The camshaft posi-
tion sensor (PHASE) senses the piston position.
When the crankshaft position sensor (POS) system becomes inoper-
ative, the camshaft position sensor (PHASE) provides various con-
trols of engine parts instead, utilizing timing of cylinder identification
signals.
The sensor consists of a permanent magnet and Hall IC.
When engine is running, the high and low parts of the teeth cause
the gap with the sensor to change.
The changing gap causes the magnetic field near the sensor to
change.
Due to the changing magnetic field, the voltage from the sensor changes. 
ECM receives the signals as shown in the figure.

Crankshaft Position Sensor (POS)

INFOID:0000000009650929

The crankshaft position sensor (POS) is located on the oil pan facing
the gear teeth (cogs) of the signal plate. It detects the fluctuation of
the engine revolution.
The sensor consists of a permanent magnet and Hall IC.
When the engine is running, the high and low parts of the teeth
cause the gap with the sensor to change.
The changing gap causes the magnetic field near the sensor to
change.
Due to the changing magnetic field, the voltage from the sensor
changes.
The ECM receives the voltage signal and detects the fluctuation of
the engine revolution.
ECM receives the signals as shown in the figure.

JMBIA0064ZZ

JMBIA0001GB

JMBIA0062ZZ

JMBIA0001GB

COMPONENT PARTS

EC-23

< SYSTEM DESCRIPTION >

[VQ35DE]

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Intake Valve Timing Control Solenoid Valve

INFOID:0000000009650930

Intake valve timing control solenoid valve is activated by ON/OFF
pulse duty (ratio) signals from the ECM.
The intake valve timing control solenoid valve changes the oil
amount and direction of flow through intake valve timing control unit
or stops oil flow.
The longer pulse width advances valve angle.
The shorter pulse width retards valve angle.
When ON and OFF pulse widths become equal, the solenoid valve
stops oil pressure flow to fix the intake valve angle at the control
position.

Engine Coolant Temperature Sensor

INFOID:0000000009650931

The engine coolant temperature sensor is used to detect the engine
coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

<Reference data>

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

Engine Oil Temperature Sensor

INFOID:0000000009650932

The engine oil temperature sensor is used to detect the engine oil
temperature. The sensor modifies a voltage signal from the ECM.
The modified signal returns to the ECM as the engine oil tempera-
ture input. The sensor uses a thermistor which is sensitive to the
change in temperature. The electrical resistance of the thermistor
decreases as temperature increases.

PBIB1842E

SEF594K

Engine coolant temperature

[

°

C (

°

F)]

Voltage

*

 (V)

Resistance (k

Ω

)

–10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.1 - 2.9

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

SEF012P

SEF594K

EC-24

< SYSTEM DESCRIPTION >

[VQ35DE]

COMPONENT PARTS

<Reference data>

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

Knock Sensor

INFOID:0000000009650933

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.

VIAS Control Solenoid Valve 1 and 2

INFOID:0000000009650934

The VIAS control solenoid valve cuts the intake manifold vacuum signal for power valve control. It responds to
ON/OFF signals from the ECM. When the solenoid is OFF, the vacuum signal from the intake manifold is cut.
When the ECM sends an ON signal the coil pulls the plunger downward and sends the vacuum signal to the
power valve actuator.

Power Valve Actuator 1 and 2

INFOID:0000000009650935

The power valves are used to control the suction passage of the variable induction air control system. They
are set in the fully closed or fully opened position by the power valve actuators operated by the vacuum stored
in the vacuum tank. The vacuum to power valve actuators is controlled by the VIAS control solenoid valves.

Electronic Controlled Engine Mount

INFOID:0000000009650936

In the idle range, ECM turns OFF the electronically-controlled engine mount control solenoid valve and applies
manifold pressure to the electronically-controlled engine mount. This decreases damping force of the electron-
ically-controlled engine mount and absorbs vibrations traveling from the engine to the body for improving the
quietness. 
In the driving range, ECM turns ON the electronically-controlled engine mount control solenoid valve and cuts
manifold pressure applied on the electronically-controlled engine mount. This increases damping force of the
electronically-controlled engine mount and reduces vibrations generated during driving.

Engine oil temperature

[

°

C (

°

F)]

Voltage

*

 (V)

Resistance (k

Ω

)

–10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.37 - 2.63

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

110 (230)

0.6

0.143 - 0.153

SEF012P

JSBIA0284ZZ

COMPONENT PARTS

EC-25

< SYSTEM DESCRIPTION >

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Refrigerant Pressure Sensor

INFOID:0000000009650937

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.

Battery Current Sensor (With Battery Temperature Sensor)

INFOID:0000000009650938

OUTLINE

The power generation voltage variable control enables fuel con-
sumption to be decreased by reducing the engine load which is
caused by the power generation of the generator.
Based on sensor signals, ECM judges whether or not the power
generation voltage variable control is performed. When performing
the power generation voltage variable control, ECM calculates the
target power generation voltage based on the sensor signal. And
ECM sends the calculated value as the power generation command
value to IPDM E/R.

CAUTION:

Never connect the electrical component or the ground wire directly to the battery terminal. The con-
nection causes the malfunction of the power generation voltage variable control, and then the battery
discharge may occur.

BATTERY CURRENT SENSOR

The battery current sensor is installed to the battery cable at the negative terminal. The sensor measures the
charging/discharging current of the battery.

BATTERY TEMPERATURE SENSOR

Battery temperature sensor is integrated in battery current sensor.
The sensor measures temperature around the battery.
The electrical resistance of the thermistor decreases as temperature
increases.
<Reference data>

*: These data are reference values and are measured between bat-
tery temperature sensor signal terminal and sensor ground.

Power Steering Pressure Sensor

INFOID:0000000009650939

Power steering pressure sensor is installed to the power steering high-pressure tube and detects a power
steering load.

PBIB2657E

JPBIA3262ZZ

Temperature [

°

C (

°

F)]

Voltage* (V)

Resistance (k

Ω

)

25 (77)

3.333

1.9 - 2.1

90 (194)

0.969

0.222 - 0.258

SEF012P