Nissan Sentra. Manual - part 331

EC-20

< SYSTEM DESCRIPTION >

[MRA8DE]

COMPONENT PARTS

The sensor element of the A/F sensor 1 is composed an electrode

layer, which transports ions. It has a heater in the element.
The sensor is capable of precise measurement = 1, but also in the

lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide range.

The exhaust gas components diffuse through the diffusion layer at

the sensor cell. An electrode layer is applied voltage, and this current

relative oxygen density in lean. Also this current relative hydrocar-

bon density in rich.

Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this

electrode layer of current. In addition, a heater is integrated in the

sensor to ensure the required operating temperature of approxi-

mately 760

°C (1,400°F).

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.

ASCD Steering Switch

INFOID:0000000009758329

ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation

of switch, and determines which button is operated.

Battery Current Sensor (with Battery Temperature Sensor)

INFOID:0000000009758330

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. For the details of the power generation voltage

variable control, refer to

CHG-8, "System Description"

CAUTION:

Never connect the electrical component or the ground wire

directly to the battery terminal. The connection causes the malfunction of the power generation volt-

age variable control, and then the battery discharge may occur.

BATTERY CURRENT SENSOR

The battery current sensor is installed to the battery negative cable. The sensor measures the charging/dis-

charging current of the battery.

BATTERY TEMPERATURE SENSOR

JPBIA4038GB

PBIB3354E

JPBIA3262ZZ

COMPONENT PARTS

EC-21

< SYSTEM DESCRIPTION >

[MRA8DE]

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 battery temperature
sensor signal terminal and sensor ground.

Camshaft Position Sensor (PHASE)

INFOID:0000000009758331

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.

Clutch Pedal Position Switch

INFOID:0000000009758332

Stop lamp switch is installed to clutch pedal bracket. The switch detects the state of the clutch pedal and trans-

mits an ON/OFF signal to ECM.

Crankshaft Position Sensor (POS)

INFOID:0000000009758333

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.

Cooling Fan

INFOID:0000000009758334

Cooling fan operates when the current flows in the cooling fan motor.

For control details, refer to

EC-47, "COOLING FAN CONTROL : System Description"

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

JPBIA4621ZZ

Clutch pedal

Clutch pedal position switch

Released

OFF

Depressed

JPBIA4617ZZ

EC-22

< SYSTEM DESCRIPTION >

[MRA8DE]

COMPONENT PARTS

ECM

INFOID:0000000009758335

The ECM consists of a microcomputer and connectors for signal

input and output and for power supply. The ECM controls the engine.

Electric Throttle Control Actuator

INFOID:0000000009758336

OUTLINE

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

tion sensor.

THROTTLE CONTROL MOTOR RELAY

Power supply for the throttle control motor is provided to the ECM via throttle control motor relay. The throttle

control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends

an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition

switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not

provided to the ECM.

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 and it provides feed-

back to the ECM to control the throttle control motor to make the throttle valve opening angle properly in

response to driving condition.

THROTTLE POSITION SENSOR

The throttle position sensor responds to the throttle valve movement.

JPBIA5843ZZ

JSBIA0270GB

COMPONENT PARTS

EC-23

< SYSTEM DESCRIPTION >

[MRA8DE]

The throttle position sensor has two sensors. These sensors are a

kind of potentiometers which transform the throttle valve position into

output voltage, and emit the voltage signal to the ECM. In addition,

these sensors detect the opening and closing speed of the throttle

valve and feed the voltage signals to the ECM. The ECM judges the

current opening angle of the throttle valve from these signals and the

ECM controls the throttle control motor to make the throttle valve

opening angle properly in response to driving condition.

Engine Coolant Temperature Sensor

INFOID:0000000009758337

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 Pressure Sensor

INFOID:0000000009758338

The engine oil pressure (EOP) sensor is detects engine oil pressure

and transmits a voltage signal to the ECM.

PBIB0145E

JSCIA0285ZZ

Engine coolant 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

SEF012P

JSBIA0292ZZ

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