fuel pump NISSAN PULSAR 1987 User Guide
[x] Cancel search | Manufacturer: NISSAN, Model Year: 1987, Model line: PULSAR, Model: NISSAN PULSAR 1987Pages: 238, PDF Size: 28.91 MB
Page 76 of 238
Cooling and Heating Systems
7. THERMOSTAT HOUSING
Special Equipment Required:
To Adjust Camshaft Drive Belt — Adjusting tool
TO REMOVE AND INSTAL
(1) Disconnect the negative battery terminal.
(2) On 1.6 liter models, remove the air cleaner
assembly from the engine. Refer to the Fuel and
Engine Management section if necessary. (3) Drain the cooling system as previously de-
scribed. (4) Remove the camshaft drive belt as described
in the Engine section under the heading Camshaft
Drive Belt. (5) Remove the bolts retaining the camshaft
drive belt rear cover to the cylinder block and remove
the rear cover.
\ COOLANT TEMPERATURE SENSOR TEMPERATURE SENDER SWITCH
View of the thermostat housing and
components.
(6) Disconnect the top radi ator hose, the heater
hose and the inlet manifold heater hose from the
thermostat housing.
(7) Disconnect the wire from the temperature
sender switch and the coolant temperature sensor. (8) Remove the bolts retaining the thermostat
housing to the cylinder head and remove the thermo-
stat housing and the O ring from the cylinder head. Installation is a reversal of the removal procedure
with attention to the following points:
(1) Ensure that all mounting faces are clean.
(2) Renew the O ring on installation.
NOTE; Ensure that the O ring is not
twisted. Do not use sealant.
(3) Tighten the thermostat housing retaining
bolts to the specified torque. (4) Adjust the camshaft drive belt tension as
described in the Engine section under the heading
Camshaft Drive Belt. (5) Fill the cooling system as previously de-
scribed and check for coolant leaks. 8. WATER PUMP
Special Equipment Required:
To Adjust Camshaft Drive Belt — Adjusting tool
TO REMOVE AND INSTAL
NOTE: The water pump is non-repairable
and if faulty must be renewed as a complete
assembly.
(1)
Drain the cooling system as previously de-
scribed.
(2) Remove the camshaft drive belt as described
in the Engine section under the heading Camshaft
Drive Belt. (3) Remove the water pump retaining bolts and
remove the water pump and the O ring from the
engine. Installation is a reversal of the removal procedure
with attention to the following points:
View of the water pump and components removed
from the vehicle.
(1) Ensure that all mounting faces are clean.
(2) Use a new O ring and smear it with a liberal
amount of silicone grease.
(3) Install the water pump to the engine but
do
not tighten the retaining bolts until the camshaft drive
belt has been installed and tensioned correctly as
described in the Engine section under the heading
Camshaft Drive Belt.
(4) Fill the cooling system as previously de-
scribed in this section and check for coolant leaks.
9. WELCH PLUGS
To facilitate the casting of the cylinder block and
cylinder head passages and water jackets, a number of
openings had to be ma de at manufacture.
Page 82 of 238
82
FUEL AND ENGINE MANAGEMENT
CAUTION: To prevent severe electrical shock, extreme care must be taken when
working on or near the electronic ignition system as dangerous high tension voltages
are produced in both the primary and secondary circuits. See the text fo\
r
precautionary notes.
SPECIFICATIONS
FUEL INJECTION
Type:
1.6 liter engine .................................. Single point
1.8 liter engine................................... Multi point
FUEL PUMP
Type ................................................................ Electric
Pressure at idle:
1.6 liter engine ..................................... 62-90 kPa
1.8 liter engine ................................ 190-230 kPa
FUEL FILTER
Type ................................................ Inline, disposable
AIR FILTER
Type ................................... Disposable paper element
DISTRIBUTOR
Make ........................................................ Delco Remy
Advance contro l .......................................... Electronic
Rotation of rotor .................................. Anti-clockwise
Firing order....................................................1 -3-4-2
ADJUSTMENTS
Base idle speed ..................................... 550-650 rpm
Ignition timing.......................................... 10° BTDC
TORQUE WRENCH SETTINGS
Throttle body nuts.......................................... 10 Nm
*Throttle body bolts ........................................ 12 Nm
*Fuel hose fittings............................................ 35 Nm
Fuel rail bolts ....................................................8 Nm
Fuel tank drain plug ........................................ 24 Nm
Coolant temperature sensor ............................ 12 Nm
Oxygen sensor .................................................. 40 Nm
MAT sensor..................................................... 14 Nm
*1.6 liter engine
l . 8 liter engine
1. FUEL AND ENGINE MANAGEMENT
TROUBLE SHOOTING
NOTE: The following Trouble Shooting pro-
cedures are basic checks only. If these pro-
cedures fail to locate the fault, refer to the
System Diagnosis and Adjustments heading
for more thorough testing.
Prior to performing any of the following
operations, refer to the Service Precautions
and Procedures heading.
ENGINE WILL NOT START OR HARD TO
START
(1) Water in the fuel: Dr ain the fuel from the
system and renew the fuel filter.
(2) Fault in the power supply: Check the battery,
fusible links and fuses. Check for clean, secure con-
nections, particularly the earth connections. Check the
EG1 and fuel pump relays.
NOTE: If the fuel pump relay fails, power
will be supplied to the fuel pump via the oil
pressure switch. When starting the engine,
Check that the MAP sensor hose is not blocked or split
and ensure that all electrical connections are clean and
secure.
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Fuel and Engine Management 83
the fuel pump will not operate until the oil
pressure is sufficient to extinguish the oil
pressure warning lamp. Therefore it will be
necessary to operate the starter motor for a
longer period than usual to start the engine.
(3) Faulty EFI component wiring connections:
Check that all component wiring connections are
clean and secure.
(4) Manifold absolute pressure (MAP) sensor
vacuum hose blocked or disconnected: Clear or recon-
nect the vacuum hose. (5) Fault in the ignition system: Check the
primary and secondary ignition circuits.
(6) Engine flooded: Fully depress the throttle
pedal until the engine starts. Check the coolant
temperature sensor. Check th e injector(s) for leakage.
ENGINE STARTS THEN STALLS
(1) Water in the fuel: Dr ain the fuel from the
system and renew the fuel filter.
(2) Air leakage at the inlet manifold: Check all
joints and hoses for air leaks. (3) Faulty EFI wiring connections: Check that
all component wiring connections are clean and
secure.
(4) Ignition timing incorrectly set: Check and
adjust the timing. (5) MAP sensor faulty or supply hose discon-
nected or blocked: Check the vacuum supply hose.
Check the operation of the MAP sensor.
ENGINE MISFIRES
(1) Faulty, dirty or incorrectly adjusted spark
plugs: Renew or clean and adjust the spark plugs.
(2) Condensation in the distributor cap: Dry and
examine the cap for cracks. (3) Faulty high tension leads: Check and renew
the high tension leads.
Testing the fuel system pressure using a pressure
gauge.
(4) Faulty ignition coil: Check and renew the
ignition coil.
(5) Fuel blockage: Check for blockage in the fuel
filter, lines and injector(s). (6) Low fuel pressure: Check the fuel pump and
fuel pressure regulator. (7) Water in the fuel: Dr ain the fuel from the
system and renew the fuel filter. (8) Loose fuel supply wiring connectors: Check
all connectors for tightness. (9) Faulty fuel injector: Check the connections
and test the condition of the fuel injectors.
ENGINE LACKS POWER
(1) Ignition timing incorrectly set: Check and
adjust the timing.
(2) Water in the fuel: Dr ain the fuel from the
system and renew the fuel filter.
(3) Incorrectly adjusted throttle cable: Adjust the
throttle cable.
Check the distributor cap for cracks or tracking be- tween the terminals. The air filter element should be renewed at 40 000 km
intervals. 1.8 liter engine.
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Fuel and Engine Management
(4) MAP sensor faulty or supply hose discon-
nected or blocked: Check the vacuum supply hose.
Check the operation of the MAP sensor.
EXCESSIVE FUEL CONSUMPTION
(1) Blocked air cleaner element: Check the ele-
ment and clean or renew as necessary.
(2) Incorrect fuel pressure: Check the fuel pump
and fuel pressure regulator. (3) Faulty coolant temperature sensor: Check
the connections and operation.
(4) Leaks in the fuel supply system: Check the
connections and components for leakage. (5) Leaking fuel injector(s): Clean or renew the
faulty injector(s). (6) Engine operating temperature too low:
Check the thermostat and electric cooling fan as
described in the Cooling an d Heating Systems section.
2. DESCRIPTION
The engine management system on the range of
vehicles covered by this manual controls the opera-
tion of the ignition system and the fuel system.
The central component of the engine management
system is the electronic control unit (ECU). The con-
trol unit is a micro-computer which controls the igni-
tion timing and the amount of fuel injected according
to signals received from various sensors. As changes
are detected in engine load and speed, coolant tem-
perature, barometric pressure, air temperature (1.8
liter engine), throttle position and vehicle speed, the
control unit alters the ignition timing and the fuel
injection amount to achieve optimum engine effi-
ciency.
The control unit incorporates a self diagnosis
mode which stores and displays codes relating to
certain system malfunctions. Whenever power is sup-
plied to the control unit, the control unit performs a
View of the 1.8 liter engine showing the engine management components.
Ensure that all fuel connections are securely tightened.
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Fuel and Engine Management 85
View of the 1.6 liter engine showing the engine management components. Air cleaner removed for clarity.
series of tests on various components in the system
and records the results, If a fault is discovered, the
ECM warning lamp on the instrument cluster will
illuminate while the engine is running. When the self
diagnosis mode is activated, the ECM warning lamp
will flash codes indicating the area in which the fault
has occurred.
This function is very useful in locating system
faults, particularly intermittent problems. However,
the self diagnosis mode does not provide comprehen-
sive testing of the EFI system, and therefore should
always be used in conjunction with the other test
procedures described later in this section in order to
accurately locate system faults.
The high energy electronic ignition system con-
sists of a distributor and an ignition coil.
The distributor has two functions. The first is to
produce and distribute secondary high tension voltage
to the spark plugs.
The second function is to provide the control unit
with information on engine speed and crankshaft
position.
The ignition timing is constantly adjusted by the
control unit to suit varying engine and vehicle oper-
ating conditions.
In the fuel injection system, a metered amount of
fuel is sprayed into the air stream. The air/fuel
mixture then enters the combustion chamber via the
inlet valves.
On 1.6 liter engines, the fuel is injected by a single
injector, located above the throttle valve within the
throttle body assembly. The injector fires twice per
engine revolution under most operating conditions.
On 1.8 liter engines, four injectors are used. The
fuel is distributed to the injectors via the fuel rail. All
injectors fire simultaneous ly once per engine revolu-
tion under most operating conditions.
Under conditions of high load the control unit
may signal the injector(s) to fire more often. However,
if the engine speed exceeds 6 700 rpm the control unit
will cease firing the injectors until the engine speed is
below 6 200 rpm.
Fuel is supplied under pressu re by an electric fuel
pump mounted in the fuel tank and the pressure is
regulated by a pressure regulator.
On 1.6 liter engines, the regulator consists of a
spring tensioned diaphragm which is mounted to the
side of the throttle body assembly. The fuel pressure is
regulated by the tension of the spring against the
diaphragm, opening and closing the fuel return port.
On 1.8 liter engines, the pressure regulator is
mounted adjacent to the fuel rail and consists of a
diaphragm with fuel pressu re acting on one side and
spring tension and manifold vacuum acting on the
Page 89 of 238
Fuel and Engine Management 89
The procedure for fabricating an LED test lamp is
fully described in the El ectrical System section.
If a conventional test lamp with a filament type
bulb is to be used, ensure that the current draw of the
test lamp does not exceed 0.3 amp to avoid damage to
the electronic components.
To check the current draw connect an accurate
ammeter, such as the multimeter described previ-
ously, in series with the test lamp and a battery.
If the ammeter reads less than 0.3 amp the test
lamp is suitable.
Tachometer
(1) Disconnect the resistor from the tachometer
pick-up wiring connector which is located on the
ignition coil wiring harness, and connect the positive
lead of an accurate tachometer to the brown wire
terminal in the wiring connector. (2) Connect the negative lead to a good earthing
point.
View showing the location of the tachometer pickup
wiring connector with the resistor installed.
Timing Light
(1) Connect the timing light to the engine fol-
lowing the instrument manufacturers instructions.
NOTE: Do not connect or disconnect the
timing light with the engine running as
voltage surges could damage the alternator
or control unit. Do not allow the high
tension leads to open circuit with the engine
running as damage to the engine manage-
ment system could result.
(2) Do not connect the timing light positive lead
to the alternator output terminal. Where possible,
connect the power leads of the timing light to an
external power source to prevent possible transient
voltages damaging the alternator or control unit.
4. SYSTEM DIAGNOSIS AND ADJUSTMENTS
NOTE: Due to the use of complex electronic
components in the engine management sys-
tem, the diagnosis and testing procedures
described in this section should not be
carried out by persons lacking an under-
standing of electronics and the precautions
associated with the servicing of electronic
components. It is rec ommended that should
a fault arise in the system, the vehicle be
referred to an authorized workshop.
The control unit can be damaged by
component faults not indicated by the self
diagnosis codes and the renewal of the
control unit without lo cating the cause of
the failure will result in the failure of the
replacement unit. It is for this reason that
the practice of substituting components to
isolate faults is not recommended.
Prior to performing any of the follow-
ing operations, refer to the Service Pre-
cautions and Procedures heading.
PRELIMINARY CHECKS
Prior to performing the Self Diagnosis Test Pro-
cedures, perform the following preliminary checks and
rectify any problems as necessary.
(1) Check for an adequate supply of fuel in the
fuel tank. (2) Check the wiring connectors and earth points
of all engine management components for clean,
secure connections. To prevent damage to the control
unit, disconnect the negative battery terminal before
disconnecting any engine ma nagement wiring connec-
tors. (3) Check the condition of the battery. Refer to
the Electrical System sectio n for checking procedures.
Rectify any faults as necessary. (4) Check the air cleaner element for restriction.
(5) Check for air leaks at the throttle body, inlet
manifold and all related hoses. (6) Check the fuel pump pr essure as described
later in this section. (7) Ensure that the engine is in a satisfactory
mechanical condition and is in tune. Refer to the
Engine and Engine Tune-up sections as necessary.
SELF DIAGNOSIS
This function is very useful in locating system
faults particularly intermittent problems. However,
the self diagnosis mode does not provide comprehen-
sive testing of the engine management system, and
therefore should always be used in conjunction with
the other test procedures described later, in order to
accurately locate system faults.
To Interpret Self Diagnosis Codes
Once the self diagnosis mode is activated, various
fault codes will be displayed as a series of flashes by
the ECM warning lamp on the instrument cluster.
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92 Fuel and Engine Management
Installed view of the throttle body assembly showing
the location of the base idle adjusting screw. 1.6 liter
engine.
(7) Disconnect the IAC valve wiring connector
and slowly connect the vacuum supply hose to the
inlet manifold. Allow five seconds to elapse and note
the engine speed.
(8) If the engine speed is not to Specifications,
remove the plug from the throttle body housing on 1.6
liter engines, or the cap from the base idle adjusting
screw on 1.8 liter engines, and adjust the idle screw
until the engine speed is 625 rpm. (9) Stop the engine and connect the IAC valve
wiring connector. (10) On 1.8 liter engines, install a new cap to
the
base idle adjusting screw.
On 1.6 liter engines, seal the throttle stop screw
with silicone sealant and install the air cleaner assem-
bly.
(11) Erase the memory codes as previously de-
scribed.
(12) Start the engine and increase the speed to
3 000 rpm for 10 seconds to allow the idle air control
valve to reset.
5. FUEL SUPPLY COMPONENTS
Special Equipment Required:
To Check Fuel Pressure — 0-500 kPa pressure
gauge
NOTE: Before proceeding with any of the
operations in this section, refer to the Ser-
vice Precautions and Procedures heading.
TO DEPRESSURISE FUEL SYSTEM
(1) Lift the front edge of the rear seat cushion on
each side, slide the cushion forward and remove it
from the vehicle. (2) Disconnect the fuel pump wiring harness
connector.
When depressurizing the fuel system, remove the rear
seat cushion and disconnect the fuel pump wiring
connector.
(3) Start and run the engine until it stalls.
Operate the starter motor for 10 seconds to ensure
that the pressure has dissipated.
(4) Connect the fuel pump wiring connector and
install the rear seat cushion.
NOTE: Failure to depressurize the fuel sys-
tem when instructed may result in a fuel
spray and possible fire.
TO TEST FOR EXTERNAL LEAKS
(1) Connect a jumper lead between terminals G
and H on the diagnostic link connector.
(2) Switch the ignition On.
(3) Check for leaks at all hose connections and
joints between the fuel pump and the engine. (4) Switch the ignition Off and remove the
jumper lead from the diagnostic link connector.
(5) If renewal of a component is necessary,
depressurize the fuel system as previously described. (6) Use only hoses and clamps as specified by
the manufacturer.
TO CHECK FUEL PRESSURE
(1) Depressurize the fuel system as previously
described. (2) On 1.6 liter engines, remove the air cleaner
as described in this section under the Air Cleaner
Assembly heading. (3) On 1.8 liter engines, release the hose clamp
securing the fuel supply hos e to the fuel rail and
disconnect the hose. On 1.6 liter engines, release the hose clamp
securing the fuel supply hose to the rear throttle body
hose fitting and disconnect the hose.
(4) Using a suitable gauge, tee piece, short piece
of fuel hose and clamps, install the pressure
gauge
between the fuel supply ho se and the fuel rail on 1.8
Page 93 of 238
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 a bove 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, disc onnect 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 consid ered 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 begi ns 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 inject ors are indicated. Remove
the injectors as described later in this section to locate
the leaking injectors.
If the pressure remains stea dy 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.
Page 94 of 238
94 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 pa nel, 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.
Page 95 of 238
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 Cleane r 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 thrott le 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 seat ed 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 connecto r(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. Pr ior 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 volt age 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 termin al on 1.6 liter engines, or
the black and red wire term inal on 1.8 liter engines,
check the EGI relay and circ uit 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 lite r 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 cont rol unit wiring connector