Nissan Quest E52. Instruction — part 452
EC-18
< SYSTEM DESCRIPTION >
[VQ35DE]
COMPONENT PARTS
ECM
INFOID:0000000009650921
• ECM (Engine Control Module) controls the engine.
A.
Fuel tank top center
B.
Rear suspension member periphery
C.
Pedal periphery
D.
Pedal periphery
No.
Component
Function
1.
Combination meter
Malfunction indicator lamp (MIL)
EC-19, "Malfunction Indicator lamp (MIL)"
Information display
The operation mode of the ASCD is indicated on the information
display in the combination meter.
ECM transmits the status signal to the combination meter via CAN
communication according to ASCD operation.
2.
ASCD steering switch
3.
Fuel level sensor unit and fuel pump
EC-28, "Fuel Level Sensor Unit and Fuel Pump"
for detailed installationlocation.
4.
Fuel tank temperature sensor
EC-28, "Fuel Tank Temperature Sensor"
5.
EVAP canister vent control valve
EC-26, "EVAP Canister Vent Control Valve"
6.
EVAP canister
EC-26, "EVAP Canister Vent Control Valve"
7.
EVAP control system pressure sensor
EC-26, "EVAP Control System Pressure Sensor"
8.
ASCD brake switch
EC-28, "Stop Lamp Switch & ASCD Brake Switch"
9.
Stop lamp switch
10.
Accelerator pedal position sensor
EC-19, "Accelerator Pedal Position Sensor"
JSBIA4089ZZ
COMPONENT PARTS
EC-19
< SYSTEM DESCRIPTION >
[VQ35DE]
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• ECM consists of a microcomputer and connectors for signal input
and output and for power supply.
• Battery voltage is supplied to the ECM even when the ignition
switch is turned OFF for the ECM memory function of the DTC
memory, the air-fuel ratio feedback compensation value memory,
the idle air volume learning value memory, etc.
Malfunction Indicator lamp (MIL)
INFOID:0000000009650922
Malfunction Indicator lamp (MIL) is located on the combination
meter.
MIL will illuminate when the ignition switch is turned ON without the
engine running. This is a bulb check.
When the engine is started, MIL should turn OFF. If the MIL remains
illuminated, the on board diagnostic system has detected an engine
system malfunction.
For details, refer to
EC-58, "Diagnosis Description"
.
Accelerator Pedal Position Sensor
INFOID:0000000009650923
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 potentiometers which transform the accelerator pedal
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors detect the opening and closing speed of
the accelerator pedal and feed 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.
Electric Throttle Control Actuator
INFOID:0000000009650924
OUTLINE
PBIA9222J
JSBIA1315ZZ
JPBIA4615ZZ
PBIB1741E
EC-20
< SYSTEM DESCRIPTION >
[VQ35DE]
COMPONENT PARTS
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 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.
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.
Ignition Coil (With Power Transistor)
INFOID:0000000009650925
The ignition signal from the ECM is sent to and amplified by the
power transistor. The power transistor turns ON and OFF the ignition
coil primary circuit. This ON/OFF operation induces the proper high
voltage in the coil secondary circuit.
JSBIA0270GB
PBIB0145E
JPBIA4613ZZ
COMPONENT PARTS
EC-21
< SYSTEM DESCRIPTION >
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Fuel Injector
INFOID:0000000009650926
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.
Mass Air Flow Sensor (With Intake Air Temperature Sensor)
INFOID:0000000009650927
MASS AIR FLOW SENSOR
The mass air flow sensor (1) is placed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. The mass air flow sensor controls the temperature of the
hot wire to a certain amount. The heat generated by the hot wire is
reduced as the intake air flows around it. The more air, the greater
the heat loss.
Therefore, the electric current supplied to hot wire is changed to
maintain the temperature of the hot wire as air flow increases. The
ECM detects the air flow by means of this current change.
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. Electrical
resistance of the thermistor decreases in response to the temperature rise.
<Reference data>
*: These data are reference values and are measured between ECM terminals.
PBIA9664J
PBIA9559J
Intake air temperature
[
°
C (
°
F)]
Voltage
*
(V)
Resistance (k
Ω
)
25 (77)
3.3
1.800 - 2.200
80 (176)
1.2
0.283 - 0.359
SEF012P
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