Nissan Note E12. Manual — part 169
COMPONENT PARTS
EC-15
< SYSTEM DESCRIPTION >
[HR16DE]
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ECM
INFOID:0000000009022416
The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The ECM controls the engine.
Accelerator Pedal Position Sensor
INFOID:0000000009022417
The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The sensor detects the accelera-
tor position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometer which transform the accelerator pedal
position into output voltage, and emit the voltage signals to the ECM.
The ECM judges the current opening angle of the accelerator pedal
from these signals and controls the throttle control motor based on
these signals.
Idle position of the accelerator pedal is determined by the ECM
receiving the signal from the accelerator pedal position sensor. The
ECM uses this signal for the engine operation such as fuel cut.
Air Fuel Ratio Sensor 1
INFOID:0000000009022418
The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is composed an elec-
trode 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 about 800
°C
(1,472
°F).
Air Fuel Ratio Sensor 1 Heater
INFOID:0000000009022419
SYSTEM DESCRIPTION
PBIA9222J
PBIB1741E
JMBIA0112GB
PBIB3354E
EC-16
< SYSTEM DESCRIPTION >
[HR16DE]
COMPONENT PARTS
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:0000000009509471
ASCD steering switch has variant values of electrical resistance for each button. ECM reads voltage variation
of switch, and determines which button is operated.
EC-34, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description"
for the ASCD func-
tion.
Camshaft Position Sensor (PHASE)
INFOID:0000000009022421
The camshaft position sensor (PHASE) senses the protrusion 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.
Clutch Pedal Position Switch
INFOID:0000000009509475
When the clutch pedal is depressed, the clutch pedal position switch turns OFF and the clutch pedal position
switch signal is sent to the ECM. The ECM judges the clutch pedal conditions via the signal (ON or OFF).
Cooling Fan
INFOID:0000000009022422
Cooling fan operates at low and high speed when the current flows in the cooling fan motor.
EC-35, "COOLING FAN CONTROL : System Description"
Sensor
Input Signal to ECM
ECM function
Actuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)
Engine speed
Air fuel ratio (A/F) sensor 1
heater control
Air fuel ratio (A/F) sensor 1
heater
Mass air flow sensor
Amount of intake air
PBIA9209J
JPBIA5503GB
COMPONENT PARTS
EC-17
< SYSTEM DESCRIPTION >
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Crankshaft Position Sensor (POS)
INFOID:0000000009022423
The crankshaft position sensor (POS) is located on the cylinder
block rear housing facing the gear teeth (cogs) of the signal plate at
end of the crankshaft. It detects the fluctuation of the engine revolu-
tion.
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.
Electric Throttle Control Actuator
INFOID:0000000009022424
Electric throttle control actuator consists of throttle control motor, throttle position sensor, etc.
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 valve in response to driving conditions via the throttle control motor.
Engine Coolant Temperature Sensor
INFOID:0000000009022425
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>
PBIA9209J
JPBIA5503GB
SEF594K
Engine coolant temperature [
°C (°F)]
Voltage* (V)
Resistance (k
Ω)
–10 (14)
4.4
7.0 - 11.4
20 (68)
3.5
2.10 - 2.90
50 (122)
2.2
0.68 - 1.00
90 (194)
0.9
0.236 - 0.260
SEF012P
EC-18
< SYSTEM DESCRIPTION >
[HR16DE]
COMPONENT PARTS
Engine Oil Pressure Sensor
INFOID:0000000009022426
The engine oil pressure (EOP) sensor is detects engine oil pressure
and transmits a voltage signal to the ECM.
Engine Oil Temperature Sensor
INFOID:0000000009022427
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.
<Reference data>
*: These data are reference values and are measured between ECM terminals.
EVAP Canister Purge Volume Control Solenoid Valve
INFOID:0000000009022428
The EVAP canister purge volume control solenoid valve uses a ON/
OFF duty to control the flow rate of fuel vapor from the EVAP canis-
ter. The EVAP canister purge volume control solenoid valve is
moved by ON/OFF pulses from the ECM. The longer the ON pulse,
the greater the amount of fuel vapor that will flow through the valve.
JSBIA0292ZZ
SEF594K
Engine oil temperature [
°C (°F)]
Voltage
*
(V)
Resistance (k
Ω)
–10 (14)
4.4
7.0 - 11.4
20 (68)
3.5
2.10 - 2.90
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
JSBIA0651ZZ
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