Nissan March K13. Manual - part 217

COMPONENT PARTS

EC-329

< SYSTEM DESCRIPTION >

[HR12DE (TYPE 2)]

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Electric Throttle Control Actuator

INFOID:0000000006036724

OUTLINE

Electric throttle control actuator consists of throttle body, throttle valve, throttle control motor and throttle posi-
tion sensor.

THROTTLE CONTROL MOTOR

The throttle control motor is operated by the ECM and it opens and closes the throttle valve.
The current opening angle of the throttle valve is detected by the throttle position sensor. The throttle position
sensor provides feedback to the ECM, when opens/closes the throttle valve in response to driving conditions
via the throttle control motor.
ECM inhibits THROTTLE VALVE CLOSED POSITION LEARNING under clogging-prone conditions to reduce
the clogging in the throttle valve closed position. When detecting a clogging in the throttle valve closed posi-
tion, ECM maximizes the motor driving torque of the electronic throttle to eliminate the clogging.

THROTTLE POSITION SENSOR

The throttle position sensor responds to the throttle valve movement. 
The throttle position sensor has two sensors. These sensors are a
kind of potentiometer which transform the throttle valve position into
output voltage, and emit the voltage signal to the ECM. The ECM
judges the current opening angle of the throttle valve from these sig-
nals and controls the throttle valve opening angle in response to
driving conditions via the throttle control motor.

Crankshaft Position Sensor (POS)

INFOID:0000000006036725

The crankshaft position sensor (POS) is located on the transmission
housing 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.

JSBIA0270GB

PBIB0145E

PBIA9209J

EC-330

< SYSTEM DESCRIPTION >

[HR12DE (TYPE 2)]

COMPONENT PARTS

ECM receives the signals as shown in the figure.

Camshaft Position Sensor (PHASE)

INFOID:0000000006036726

The camshaft position sensor (PHASE) senses the protrution of the
signal plate installed to the camshaft (INT) rear end to identify a par-
ticular cylinder. The camshaft position 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.

Engine Coolant Temperature Sensor

INFOID:0000000006036727

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.

JSBIA0394GB

PBIA9209J

JSBIA0394GB

SEF594K

COMPONENT PARTS

EC-331

< SYSTEM DESCRIPTION >

[HR12DE (TYPE 2)]

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<Reference data>

*: These data are reference values and are measured between ECM terminals 38
(Engine coolant temperature sensor) and 44 (Sensor ground).

Fuel Injector

INFOID:0000000006036728

The fuel injector is a small, precise solenoid valve. When the ECM
supplies a ground to the fuel injector circuit, the coil in the fuel injec-
tor is energized. The energized coil pulls the ball valve back and
allows fuel to flow through the fuel injector into the intake manifold.
The amount of fuel injected depends upon the injection pulse dura-
tion. Pulse duration is the length of time the fuel injector remains
open. The ECM controls the injection pulse duration based on
engine fuel needs.

Fuel Pump

INFOID:0000000006036729

The ECM activates the fuel pump for 1 second after the ignition
switch is turned ON to improve engine startability. If the ECM
receives a engine speed signal from the camshaft position sensor
(PHASE), it knows that the engine is rotating, and causes the pump
to operate. If the engine speed signal is not received when the igni-
tion switch is ON, the engine stalls. The ECM stops pump operation
and prevents battery discharging, thereby improving safety. The
ECM does not directly drive the fuel pump. It sends the control signal
to the fuel pump control module, which in turn controls the fuel
pump.

Heated Oxygen Sensor 1

INFOID:0000000006036753

DESCRIPTION

Engine coolant temperature 

[

°

C (

°

F)]

Voltage* (V)

Resistance (k

Ω

)

−

10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.35 - 2.73

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

SEF012P

PBIA9664J

JSBIA0498ZZ

Condition

Fuel pump operation

Ignition switch is turned to ON.

Operates for 1 second.

Engine running and cranking

Operates.

When engine is stopped

Stops in 1.5 seconds.

Except as shown above

Stops.

EC-332

< SYSTEM DESCRIPTION >

[HR12DE (TYPE 2)]

COMPONENT PARTS

The heated oxygen sensor 1 is placed into the exhaust manifold. It
detects the amount of oxygen in the exhaust gas compared to the
outside air. The heated oxygen sensor 1 has a closed-end tube
made of ceramic zirconia. The zirconia generates voltage from
approximately 1 V in richer conditions to 0 V in leaner conditions.
The heated oxygen sensor 1 signal is sent to the ECM. The ECM
adjusts the injection pulse duration to achieve the ideal air-fuel ratio.
The ideal air-fuel ratio occurs near the radical change from 1 V to 0
V.

HEATED OXYGEN SENSOR 1

The ECM performs ON/OFF duty control of the heated oxygen sensor 1 heater corresponding to the engine
operating condition to keep the temperature of heated oxygen sensor 1 element at the specified range.

Heated Oxygen Sensor 2

INFOID:0000000006036732

DESCRIPTION

The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the heated oxygen sensor 1 are
shifted, the air fuel ratio is controlled to stoichiometric, by the signal
from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1 V in richer conditions to 0 V in leaner con-
ditions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.

HEATED OXYGEN SENSOR 2 HEATER

Heated oxygen sensor 2 heater is integrated in the sensor.
The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed,
amount of intake air and engine coolant temperature. 

SEF463R

SEF288D

Engine speed

Heated oxygen sensor 1 heater

Above 3,600 rpm

OFF

Below 3,600 rpm after warming up

ON

SEF327R

Engine speed

Heated oxygen sensor 2 heater

Above 3,600 rpm

OFF

Below 3,600 rpm after the following conditions are met.
• Engine: After warming up
• Keeping the engine speed between 3,500 and 4,000 rpm for 1 

minute and at idle for 1 minute under no load

ON