Nissan PULSAR N13 Series / ASTRA LD Series. Instruction — part 23
Fuel and Engine Management
93
liter engines, or the throttle body hose fitting on 1.6
liter engines.
(5) Tighten all connectors securely. Check for
external leaks as previously described.
(6) Start the engine and note the pressure while
the engine is idling.
(7) Switch the engine Off and check that the
residual pressure does not decrease.
If the fuel pressure is within Specifications and
does not decrease, the fuel system is in a serviceable
condition. Depressurize the fuel system and discon-
nect the pressure gauge.
If the fuel pressure is above Specifications proceed
to operation (9).
If the fuel pressure is below Specifications proceed
to the following operation.
If the fuel pressure decreases, an internal leak is
indicated. Proceed to the following heading and carry
out the test procedure.
Testing the fuel system pressure using a pressure
gauge. 1.8 liter engine.
NOTE: There may be a small initial de-
crease in pressure when the engine is
switched Off This is acceptable and does not
indicate a fault in the system.
(8) If the fuel pressure is below Specifications
proceed as follows:
(a) Check the fuel lines for blockages and kinks
or a blocked fuel filter or fuel pump pickup strainer.
(b) If no fault can be found in the previous
checks, on 1.8 liter engines clamp the fuel return hose
at the fuel rail.
On 1.6 liter engines, clamp the hose that is
connected to the front throttle body hose fitting.
(c) Connect a jumper lead between terminals G
and H on the diagnostic link connector and switch the
ignition On.
NOTE: Do not operate the fuel pump for
longer than is necessary to obtain a pressure
reading.
If the fuel pressure is less than 270 kPa on 1.8 liter
engines or 90 kPa on 1.6 liter engines, renew the fuel
pump.
If the fuel pressure is more than previously
specified, renew the pressure regulator assembly on
1.8 liter engines or the pressure regulator diaphragm
on 1.6 liter engines.
(9) If the fuel pressure in operation (6) is above
Specifications, proceed as follows:
(a) On 1.8 liter engines, disconnect the fuel
return hose from the pressure regulator outlet.
On 1.6 liter engines, disconnect the fuel return
hose from the front throttle body hose fitting.
(b) Connect a suitable length of fuel hose to the
pressure regulator or the front throttle body hose
filling and place the opposite end of the hose into a
petroleum resistant container.
(c) Connect a jumper lead between terminals G
and H on the diagnostic link connector and switch the
ignition On.
If the fuel pressure is 230-270 kPa on 1.8 liter
engines or 62-90 kPa on 1.6 liter engines, locate and
remove the restriction in the fuel return hose or pipe.
If the fuel pressure is more than previously
specified, renew the pressure regulator assembly on
1.8 liter engines or the pressure regulator diaphragm
on 1.6 liter engines.
TO TEST FOR INTERNAL FUEL LEAKAGE
Check the residual fuel pressure as previously
described.
If the pressure has decreased it is an indication of
an internal leak. With the pressure gauge still at-
tached, proceed as follows:
(1) Switch the ignition On to pressurize the fuel
system.
(2) As the pressure begins to decrease clamp the
fuel supply hose shut. If the pressure remains steady
the fuel pump may be considered faulty and should be
renewed as described later in this section.
(3) If the pressure continues to decrease switch
the ignition On after it has been Off at least 10
seconds. As the pressure begins to decrease clamp the
fuel return hose shut.
If the pressure remain steady on 1.8 liter engines,
renew the pressure regulator. If the pressure continues
to decrease, leaking injectors are indicated. Remove
the injectors as described later in this section to locate
the leaking injectors.
If the pressure remains steady on 1.6 liter engines,
renew the pressure regulator diaphragm as described
later in this section. If the pressure continues to
decrease remove the injector and renew the O ring
seals as described later in this section. If this fails to
rectify the fault remove the injector and clean or
renew the injector as necessary.
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Fuel and Engine Management
FUEL FILTER
To Remove and Install
Refer to the Engine Tune-up section for the
procedure to remove and install the fuel filter.
FUEL PUMP
To Test Electrical Circuit
Refer to the EGI and Fuel Pump Relays heading
later in this section for the test procedures.
To Remove and Install
(1) Depressurize the fuel system as previously
described.
(2) Disconnect the negative battery terminal.
(3) Remove the rear seat backrest as described
under the Seats heading in the Body section.
(4) Remove the bolts securing the fuel pump
cover plate to the floor panel, remove the rubber
grommet and slide the cover plate from the wiring
harness.
(5) Mark the fuel hoses to ensure correct install-
lation and disconnect the hoses from the fuel pump.
(6) Remove the fuel pump retaining screws and
carefully remove the fuel pump from the fuel tank.
View of the fuel pump cover plate removed, showing
the fuel pump installed.
Installation is a reversal of the removal procedure
with attention to the following points:
(1) Ensure that a new fuel pump O ring seal is
installed.
(2) Tighten the fuel pump retaining screws and
the fuel hose clamps securely.
(3) Ensure that the rubber grommet is seated
correctly in the fuel pump cover plate.
(4) Install the fuel pump cover plate ensuring
that the arrow on the plate is facing the front of the
vehicle.
(5) Connect the negative battery terminal, start
the engine and test for leaks as previously described.
Rectify as necessary.
FUEL PRESSURE REGULATOR
To Remove and Install — 1.8 Liter Engine
(1) Depressurize the fuel system as previously
described.
(2) Disconnect the negative battery terminal.
View of the fuel pump assembly removed from the fuel
tank.
Installed view of the fuel pressure regulator. 1.8 liter
engine
.
Fuel and Engine Management
95
(3) Disconnect the vacuum hose from the pres-
sure regulator.
(4) Release the fuel hose clamps, disconnect the
hoses from the pressure regulator and remove the
pressure regulator.
Installation is a reversal of the removal procedure
ensuring that the fuel hose clamps are tightened
securely.
To Remove and Install — 1.6 Liter Engine
(1) Depressurize the fuel system as previously
described.
(2) Disconnect the negative battery terminal.
(3) Remove the air cleaner assembly. If neces-
sary, refer to the Air Cleaner Assembly heading in this
section.
(4) Remove the screws securing the pressure
regulator cover to the throttle body assembly.
When removing the final screw hold the cover
firmly as it is under spring tension.
(5) Remove the cover, spring seat, spring and
diaphragm from the throttle body assembly. Discard
the diaphragm.
View of the pressure regulator components removed
from the throttle body assembly. 1.6 liter engine.
Installation is a reversal of the removal procedure
with attention to the following points:
(1) Install a new diaphragm ensuring that
the
diaphragm is correctly seated in the groove in the
throttle body assembly.
(2) Apply Loctite 262 to the threads of the
retaining screws.
(3) Place the spring seat and the spring in the
cover and install the cover to the throttle body
assembly, ensuring that the cover is positioned on the
locating dowels.
(4) While holding the cover in position install
the
retaining screws and tighten securely.
NOTE: When installing the pressure regu-
lator cover ensure that the diaphragm is not
disturbed, to prevent the possibility of a fuel
leak.
INJECTORS
To Test Injector Circuit and Injectors
(1) Disconnect the injector wiring connectors.
(2) Connect a test lamp between the injector
wiring connector terminals, ensuring that the test
lamp probes do not contact each other.
(3) With the ignition switched On the test lamp
should not light. On 1.8 liter engines, check each of
the other connectors.
If the test lamp lights check the wiring harness for
a short to earth between the injector wiring connec-
tor(s) and the control unit wiring connector termi-
nal - D15 and D16 on 1.8 liter engines, or D16 on
1.6 liter engines.
(4) With the aid of an assistant, operate the
starter motor. The test lamp should flash. On 1.8 liter
engines, check each of the other connectors.
If the test lamp does not flash when connected to
the injector wiring connector(s), proceed to operation
(6).
If the test lamp lights as described, proceed as
follows.
If the test lamp lights but fails to flash, a faulty
control unit is indicated. Prior to renewing the control
unit, check the condition of the injectors as follows.
(5) Connect an ohmmeter between the terminals
of the injectors).
The resistance should be more than 1.2 ohms on
1.6 liter engines or more than 12 ohms on 1.8 liter
engines.
If the injector resistance is as specified, the
injector circuit can be considered serviceable.
If the injector resistance is not as specified, renew
the faulty injector(s).
(6) With the ignition switched On, probe the
injector wiring connector terminals with a test lamp to
earth.
If the test lamp lights when the probe contacts the
pink wire terminal on 1.6 liter engines, or the white
wire terminal on 1.8 liter engines, check the wiring
harness for a short to voltage between the injector
wiring connector(s) and the control unit wiring con-
nector terminal(s) D16 on 1.6 liter engines, or D15
and D16 on 1.8 liter engines.
If the test lamp does not light when the probe
contacts the blue wire terminal on 1.6 liter engines, or
the black and red wire terminal on 1.8 liter engines,
check the EGI relay and circuit as described under the
EG! and Fuel Pump Relays heading in this section.
If the test lamp lights when the probe contacts the
blue wire terminal on 1.6 liter engines, or the blue and
red wire terminal on 1.8 liter engines, proceed as
follows.
(7) Switch the ignition Off and connect the
injector wiring connectors).
(8) Switch the ignition On and, using a test lamp
to earth, backprobe the control unit wiring connector
96
Fuel and Engine Management
terminal D16 on 1.6 liter engines, or D15 and D16
on
1.8 liter engines.
The test lamp should light.
If the test lamp does not light check the wiring
harness for continuity between the injector wiring
connector(s) and the control unit wiring connector
terminals.
Repair or renew the wiring harness as necessary.
To Remove and Install Injectors and Fuel Rail — 1.8
Liter Engine.
(1) Depressurize the fuel system as previously
described.
(2) Disconnect the negative battery terminal.
(3) Thoroughly clean around the injectors and
View of the fuel rail, injectors and pressure regulator
removed from the engine.
the fuel rail to prevent foreign material entering the
engine.
(4) Suitably mark the fuel hoses, loosen the hose
clamps and disconnect the fuel hoses from the fuel
rail.
(5) Disconnect the vacuum hose from the fuel
pressure regulator.
(6) Loosen the hose clamp and disconnect the
engine ventilation hose from the throttle body.
(7) Remove the bolts securing the fuel rail and
injectors to the inlet manifold.
(8) Carefully raise the fuel rail and injectors
from the inlet manifold until the injector nozzles are
clear of the manifold.
(9) Disconnect each injector wiring connector by
pushing in the wire retaining clip.
(10) Using a small screwdriver, remove the injec-
tor retaining clip and withdraw the injectors from the
fuel rail.
Installation is a reversal of the removal procedure
with attention to the following points:
(1) Check the condition of the injector O ring
seals and renew if necessary.
(2) Install the injectors to the fuel rail and secure
with the retaining clips.
(3) Connect the wiring connectors to each injec-
tor ensuring that the wire clip is locked in position.
(4) Install the injectors to the inlet manifold,
carefully guiding the injectors into place ensuring that
the O ring seals are not damaged.
(5) Install the fuel rail retaining bolts and tighten
to the specified torque.
(6) Install the fuel hoses to the fuel rail
and
tighten the hose clamps securely.
(7) Check for fuel leaks as previously described.
To Remove and Install Injector — 1.6 Liter Engine
(1) Depressurize the fuel system as previously
described.
(2) Disconnect the negative battery terminal.
(3) Remove the air cleaner assembly. If neces-
sary refer to the heading Air Cleaner Assembly in this
section.
(4) Remove the injector retaining plate screw
and remove the injector retaining plate from the
throttle body assembly.
(5) Insert the blade of a screwdriver from the
front of the throttle body assembly under the rim of
the injector in which the retaining plate locates.
Support the screwdriver on a suitable object to act as
a fulcrum.
(6) Carefully lever the screwdriver until the
injector can be withdrawn from the throttle body
assembly.
(7) Remove and discard the upper and lower O
ring seals from the injector. If necessary remove the
lower filter screen from the injector.
NOTE: As the injector contains electrical
View of the fuel injector removed from the throttle
body assembly. 1.6 liter engine.
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