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Nissan Qashqai J11. Manual - part 261

COMPONENT PARTS

ECM-21

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

Operating Chart

Fuel Rail Pressure Sensor

INFOID:0000000010702791

The fuel rail pressure (FRP) sensor is placed to the fuel rail and
measures fuel pressure in the fuel rail. The sensor transmits voltage-
signal to the ECM. As the pressure increases, the voltage rises. The
ECM controls the fuel pressure in the fuel rail by operating high pres-
sure fuel pump. The ECM uses the signal from fuel rail pressure sen-
sor as a feedback signal.

Low Pressure Fuel Pump

INFOID:0000000010702792

The low pressure fuel pump is integrated with a fuel pressure
regulator and a fuel filter. This pump is build into the fuel tank.

Mass Air Flow Sensor (With Intake Air Temperature Sensor)

INFOID:0000000010702793

MASS AIR FLOW SENSOR

JSBIA0286GB

JSBIA0291ZZ

JSBIA4496ZZ

ECM-22

< SYSTEM DESCRIPTION >

[MR20DD]

COMPONENT PARTS

The mass air flow sensor

is placed in the stream of intake air. It

measures the intake flow rate by measuring a part of the entire
intake flow. The MAF sensor controls the temperature of the heater
in sensing element to a certain amount. The temperature distribution
around the heater changes according to the increase in intake air
volume. The change is detected by a thermistor and the air volume
data is sent to ECM by the MAF sensor.

INTAKE AIR TEMPERATURE SENSOR

The intake air temperature sensor is built-into 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.
<Reference data>

*: These data are reference values on the diagnosis tool.

Engine Coolant Temperature Sensor

INFOID:0000000010702794

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.

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

PBIA9559J

Intake air temperature

[

C (

F)]

Voltage

(V)

Resistance (k

Ω

)

25 (77)

3.3

1.80 - 2.20

80 (176)

1.2

0.28 - 0.36

SEF012P

JPBIA5280ZZ

Engine coolant tem-

perature

[

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

SEF012P

COMPONENT PARTS

ECM-23

< SYSTEM DESCRIPTION >

[MR20DD]

ECM

Crankshaft Position Sensor

INFOID:0000000010702795

The crankshaft position sensor (POS) is located on the Cylinder
block rear end. 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.

Camshaft Position Sensor

INFOID:0000000010702796

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 mag-
netic field, the voltage from the sensor changes.

Intake Valve Timing Control Solenoid Valve

INFOID:0000000010702797

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.

Exhaust Valve Timing Control Position Sensor

INFOID:0000000010702798

Exhaust valve timing control position sensor detects the protrusion of
the signal plate installed to the exhaust camshaft rear end.
This sensor signal is used for sensing a position of the exhaust cam-
shaft.
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.

JMBIA0062ZZ

JMBIA0064ZZ

JPBIA5281ZZ

JMBIA0064ZZ

ECM-24

< SYSTEM DESCRIPTION >

[MR20DD]

COMPONENT PARTS

Exhaust Valve Timing Control Solenoid Valve

INFOID:0000000010702799

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

Intake Manifold Runner Control Valve

INFOID:0000000010702800

Intake manifold runner control valve is consist of intake manifold run-
ner control valve to open/close the right/left half section installed at
each port of intake manifold runner control valve motor to drive open/
close the valve.
ECM transmits the open/close signal to intake manifold runner con-
trol valve motor according to the driving condition based on the sig-
nals of engine speed, coolant temperature etc. ECM stabilizes
combustion by causing strong swirl flow (revolving flow) by closing
the intake manifold runner control valve.

Air Fuel Ratio (A/F) Sensor 1

INFOID:0000000010702801

Description

The A/F sensor 1 is mounted on the exhaust manifold, and transmits
the signal of detected oxygen concentration in the exhaust gas to
ECM.
While O2 sensor changes output voltage by ON/OFF (rich/lean)
mode within a narrow range of the stoichiometric ratio, the A/F sen-
sor changes output voltage between 0 - 4 V for a wide range of air
fuel ratio.
ECM judges the state of air fuel ratio with this signal, and precisely
controls air fuel ratio to match the stoichiometric ratio.Also, the sen-
sor is equiped with heater for maintaining the activated state.

A/F SENSOR 1 HEATER

A/F sensor 1 heater is integrated in the sensor.
The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating
condition to keep the temperature of A/F sensor 1 element within the specified range.

JPBIA5281ZZ

JPBIA5277ZZ

JPBIA4038GB

PBIB3354E

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