1999 NISSAN PRIMERA Electronic Repair Manual

cabin filter fuse diagram wiring door lock oil type coolant temperature

Page 825 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual Fuel Injection TimingNCEC0014S07
Two types of systems are used.
Sequential Multiport Fuel Injection System
NCEC0014S0701Fuel is injected into each cylinder during each engine cycle according to the fi

Page 826 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual System DescriptionNCEC0015S02
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of
the engine. The ignition timing data is stored in the ECM.

System DescriptionNCEC0015S02
The ignition timing is controlled by the ECM to maintain the best air-fuel ratio for every running condition of
the engine. The ignition timing data is stored in the ECM. This data forms the map shown above.
The ECM receives information such as the injection pulse width and camshaft position sensor signal. Com-
puting this information, ignition signals are transmitted to the power transistor.
e.g., N: 1,800 rpm, Tp: 1.50 msec
AÉBTDC
During the following conditions, the ignition timing is revised by the ECM according to the other data stored
in the ECM.
IAt starting
IDuring warm-up
IAt idle
IAt low battery voltage
IDuring acceleration
The knock sensor retard system is designed only for emergencies. The basic ignition timing is programmed
within the anti-knocking zone, if recommended fuel is used under dry conditions. The retard system does not
operate under normal driving conditions.
If engine knocking occurs, the knock sensor monitors the condition. The signal is transmitted to the ECM. The
ECM retards the ignition timing to eliminate the knocking condition.
Air Conditioning Cut Control
DESCRIPTIONNCEC0016Input/Output Signal ChartNCEC0016S01
Sensor Input Signal to ECMECM func-
tionActuator
Air conditioner switch Air conditioner ªONº signal
Air condi-
tioner cut
controlAir conditioner relay PNP switch Neutral position
Throttle position sensor Throttle valve opening angle
Camshaft position sensor Engine speed
Engine coolant temperature sensor Engine coolant temperature
Ignition switch Start signal
Refrigerant pressure sensor Refrigerant pressure
Vehicle speed sensor or ABS actuator and
electric unit (control unit)Vehicle speed
Power steering oil pressure switch Power steering operation
System DescriptionNCEC0016S02This system improves engine operation when the air conditioner is used.
Under the following conditions, the air conditioner is turned off.
IWhen the accelerator pedal is fully depressed.
IWhen cranking the engine.
SEF742M
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTIONSR20DE
Distributor Ignition (DI) System (Cont'd)
EC-26

Page 827 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual IAt high engine speeds.
IWhen the engine coolant temperature becomes excessively high.
IWhen operating power steering during low engine speed or low vehicle speed.
IWhen engine speed is excessively lo

IAt high engine speeds.
IWhen the engine coolant temperature becomes excessively high.
IWhen operating power steering during low engine speed or low vehicle speed.
IWhen engine speed is excessively low.
Fuel Cut Control (at no load & high engine
speed)
DESCRIPTIONNCEC0017Input/Output Signal ChartNCEC0017S01
Sensor Input Signal to ECMECM func-
tionActuator
Vehicle speed sensor or ABS actuator and
electric unit (control unit)Vehicle speed
Fuel cut
controlInjectors PNP switch Neutral position
Throttle position sensor Throttle position
Engine coolant temperature sensor Engine coolant temperature
Camshaft position sensor Engine speed
If the engine speed is above 3,950 rpm with no load, (for example, in Neutral and engine speed over 4,000
rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies based on engine speed.
Fuel cut will operate until the engine speed reaches 1,150 rpm, then fuel cut is cancelled.
NOTE:
This function is different from deceleration control listed under ªMultiport Fuel Injection (MFI) Systemº,
EC-SR-23.
Evaporative Emission System
DESCRIPTIONNCEC0018
The evaporative emission system is used to reduce hydrocarbons emitted into the atmosphere from the fuel
system. This reduction of hydrocarbons is accomplished by activated charcoals in the EVAP canister.
The fuel vapor in the sealed fuel tank is led into the EVAP canister which contains activated carbon and the
vapor is stored there when the engine is not operating or when refueling to the fuel tank.
The vapor in the EVAP canister is purged by the air through the purge line to the intake manifold when the
engine is operating.
EVAP canister purge volume control solenoid valve is controlled by ECM. When the engine operates, the flow
Intake manifold
Throttle body
Purge line
EVAP canister
purge volume
control solenoid
valve
Relief of vacuum
Sealing gas cap with
pressure relief valve
and vacuum relief
valve
Fuel tankAir
Fuel vapor EVAP
canister
SEF916W
ENGINE AND EMISSION BASIC CONTROL
SYSTEM DESCRIPTIONSR20DE
Air Conditioning Cut Control (Cont'd)
EC-27

Page 828 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual rate of vapor controlled by EVAP canister purge volume control solenoid valve is proportionally regulated as
the air flow increases.
EVAP canister purge volume control solenoid valve also shuts off th

Page 829 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual EVAPORATIVE EMISSION LINE DRAWINGNCEC0020NOTE:
Do not use soapy water or any type of solvent while installing
vacuum hoses or purge hoses.
SEF193X Intake manifold collector
Throttle body
Rear view (Le

Page 830 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual Positive Crankcase Ventilation
DESCRIPTIONNCEC0022
This system returns blow-by gas to the intake collector.
The positive crankcase ventilation (PCV) valve is provided to conduct crankcase blow-by gas

Page 831 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual Fuel Pressure ReleaseNCEC0024Before disconnecting fuel line, release fuel pressure from fuel
line to eliminate danger.
WITH CONSULT-IINCEC0024S011. Start engine.
2. Perform ªFUEL PRES RELEASEº in ª

Page 832 of 2267

NISSAN PRIMERA 1999 Electronic Repair Manual If results are unsatisfactory, perform Fuel Pressure Regulator
Check, EC-SR-32.
Fuel Pressure Regulator CheckNCEC00261. Stop engine and disconnect fuel pressure regulator vacuum
hose from intake manif

If results are unsatisfactory, perform Fuel Pressure Regulator
Check, EC-SR-32.
Fuel Pressure Regulator CheckNCEC00261. Stop engine and disconnect fuel pressure regulator vacuum
hose from intake manifold.
2. Plug intake manifold with a rubber cap.
3. Connect variable vacuum source to fuel pressure regulator.
4. Start engine and read indication of fuel pressure gauge as
vacuum is changed.
Fuel pressure should decrease as vacuum increases. If results
are unsatisfactory, replace fuel pressure regulator.
IDo not reuse O-ring.
Injector
REMOVAL AND INSTALLATIONNCEC00271. Release fuel pressure to zero.
2. Disconnect fuel hoses and injector harness connectors.
3. Remove fuel tube assemblies with fuel injectors.
4. Expand and remove clips securing fuel injectors.
5. Extract fuel injectors straight from fuel tubes.
IBe careful not to damage injector nozzles during removal.
IDo not bump or drop fuel injectors.
IDo not disassemble or adjust fuel injectors.
6. Install fuel injectors with extra care for O-rings.
IDo not reuse O-rings.
IUse bare hands to install O-rings. Do not wear gloves.
IApply a coat of new engine oil (with a low viscosity of
5W-30, etc.) to O-rings before installation.
IDo not use solvent to clean O-rings and other parts.
IMake sure that O-rings and other parts are clean and free
from foreign particles.
IBe careful not to damage O-rings with service tools, clip
or finger nails. Do not expand or twist O-rings. If
stretched, do not insert them into fuel tubes immediately
after stretching.
IAlways insert O-rings straight into fuel tubes. Do not tilt
or rotate them during installation.
7. Position clips in grooves on fuel injectors.
IMake sure that protrusions of fuel injectors are aligned
with cutouts of clips after installation.
8. Align protrusions of fuel tubes with those of fuel injectors.
Insert fuel injectors straight into fuel tubes.
9. After properly inserting fuel injectors, check to make sure that
fuel tube protrusions are engaged with those of fuel injectors,
and that flanges of fuel tubes are engaged with clips.
SEF718B
SEF927W
BASIC SERVICE PROCEDURESR20DE
Fuel Pressure Regulator Check
EC-32

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