Nissan Sentra. Manual — part 333
EC-28
< SYSTEM DESCRIPTION >
[MRA8DE]
COMPONENT PARTS
Intake Manifold Tuning Valve
INFOID:0000000009758351
Intake manifold tuning (IMT) valve is integrated to intake manifold.
Intake manifold tuning valve consists of valve and motor.
Intake manifold tuning valve is used to control the suction passage of
the intake manifold tuning system.
INTAKE MANIFOLD TUNING VALVE MOTOR
Intake manifold tuning valve motor is connected to the front end of the valve shaft.
The motor is operated by the ECM and it opens and closes the intake manifold tuning valve.
Knock Sensor
INFOID:0000000009758352
The knock sensor is attached to the cylinder block. It senses engine
knocking using a piezoelectric element. A knocking vibration from
the cylinder block is sensed as vibrational pressure. This pressure is
converted into a voltage signal and sent to the ECM.
Mass Air Flow Sensor (with Intake Air Temperature Sensor)
INFOID:0000000009758353
MASS AIR FLOW SENSOR
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 mass air flow 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 sen-
sor.
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.
JSBIA3183ZZ
JSBIA0284ZZ
PBIA9559J
Intake air temperature
[
°C (°F)]
Voltage
*
(V)
25 (77)
1.9 – 2.1
80 (176)
3.2 – 3.4
COMPONENT PARTS
EC-29
< SYSTEM DESCRIPTION >
[MRA8DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Park/Neutral Position Switch
INFOID:0000000009758354
Park/Neutral Position Switch is installed to manual transaxle. The switch detects the neutral position and
transmits a voltage signal.
Refrigerant Pressure Sensor
INFOID:0000000009758355
The refrigerant pressure sensor is installed at the condenser of the air conditioner system. The sensor uses an
electrostatic volume pressure transducer to convert refrigerant pressure to voltage. The voltage signal is sent
to ECM, and ECM controls cooling fan system.
Stop Lamp Switch & Brake Pedal Position Switch
INFOID:0000000009758356
Stop lamp switch and brake pedal position switch are installed to
brake pedal bracket.
ECM detects the state of the brake pedal by those two types of input
(ON/OFF signal).
Transmission Range Switch
INFOID:0000000009758357
Transmittion Range Switch is installed to automatic transmission and CVT transaxle. The switch detects the
state of the gear position (N range and P range) and transmits a voltage signal to ECM.
PBIB2657E
JSBIA0308ZZ
Brake pedal
Brake pedal position switch
Stop lamp switch
Released
ON
OFF
Depressed
OFF
ON
EC-30
< SYSTEM DESCRIPTION >
[MRA8DE]
STRUCTURE AND OPERATION
STRUCTURE AND OPERATION
Positive Crankcase Ventilation
INFOID:0000000009758358
This system returns blow-by gas to the intake manifold.
The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas to the intake
manifold.
During partial throttle operation of the engine, the intake manifold sucks the blow-by gas through the PCV
valve.
Normally, the capacity of the valve is sufficient to handle any blow-by and a small amount of ventilating air.
The ventilating air is then drawn from the air inlet tubes into the crankcase. In this process the air passes
through the hose connecting air inlet tubes to rocker cover.
Under full-throttle condition, the manifold vacuum is insufficient to draw the blow-by flow through the valve.
The flow goes through the hose connection in the reverse direction.
On vehicles with an excessively high blow-by, the valve does not
meet the requirement. This is because some of the flow will go
through the hose connection to the air inlet tubes under all condi-
tions.
PBIB0492E
PBIB1588E
STRUCTURE AND OPERATION
EC-31
< SYSTEM DESCRIPTION >
[MRA8DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
On Board Refueling Vapor Recovery (ORVR)
INFOID:0000000009758359
From the beginning of refueling, the air and vapor inside the fuel tank go through refueling EVAP vapor cut
valve and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by the EVAP canister and the air is
released to the atmosphere.
When the refueling has reached the full level of the fuel tank, the refueling EVAP vapor cut valve is closed and
refueling is stopped because of auto shut-off. The vapor which was absorbed by the EVAP canister is purged
during driving.
WARNING:
When conducting inspections below, be sure to observe the following:
• Put a “CAUTION: FLAMMABLE” sign in workshop.
• Do not smoke while servicing fuel system. Keep open flames and sparks away from work area.
• Be sure to furnish the workshop with a CO
2
fire extinguisher.
CAUTION:
• Before removing fuel line parts, carry out the following procedures:
- Put drained fuel in an explosion-proof container and put lid on securely.
- Release fuel pressure from fuel line. Refer to
- Disconnect battery ground cable.
• Always replace O-ring when the fuel gauge retainer is removed.
• Do not kink or twist hose and tube when they are installed.
• Do not tighten hose and clamps excessively to avoid damaging hoses.
• After installation, run engine and check for fuel leaks at connection.
• Do not attempt to top off the fuel tank after the fuel pump nozzle shuts off automatically.
Continued refueling may cause fuel overflow, resulting in fuel spray and possibly a fire.
JMBIA1930GB
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст