1987 NISSAN PULSAR fuse

Fuel and Engine Management 109


Diagram showing the identification of the relay and the relay connector terminals.
To Test Relay Circuits
(1) Remove the relevant relay as previously
described and connect the ne gative battery terminal.
(2) Connect a test lamp to earth and probe the
fuel pump relay connector terminal C or the EGI relay
connector terminal A. With the ignition switched On
the test lamp should light. If the test lamp does not light check the fuel pump
fuse and the wiring harness for continuity between the
ignition switch and the fuel pump relay connector
terminal C or EGI rela y connector terminal A.

(3) With the ignition remaining switched On,
connect the test lamp between the fuel pump relay
connector terminals C and B or the EGI relay
connector terminals A and B.

If the test lamp does not light, repair the open
circuit between terminal B and earth.

(4) When checking the EGI relay circuit, pro-
ceed to operation (9).

When checking the fuel pu mp relay circuit pro-
ceed as follows.

(5) Probe the relay connector terminal A with a
test lamp to earth. Switch the ignition On and note the
test lamp.

If the test lamp lights for 2 seconds, proceed to
step (7).

If the test lamp does not light as specified, proceed
as follows.

(6) Switch the ignition Off and backprobe the
control unit wiring connector terminal A1 with a test
lamp to earth. With the ignition switched On the test
lamp should light as previously described.

If the test lamp does not light as described, renew
the control unit.

If the test lamp does light as described, locate the
open circuit or short in the wiring harness between the
control unit wiring connector terminal Al and the
relay connector terminal A. Repair or renew the
wiring harness as necessary.

(7) With the ignition switched Off connect a
jumper lead between the relay connector terminals C
and D. (8) Switch the ignition On and listen for the
operation of the fuel pump. It should be possible to
feel vibrations in the fuel return hose. If the fuel pump is operating, the fuel pump relay
circuit can be considered serviceable.

If the fuel pump is not operating, check the wiring
harness for continuity between the fuel pump wiring
harness connector, the fuel pump relay connector
terminal D and earth. If no fault can be found, renew
the fuel pump.

(9) Probe the relay connector terminal C with a
test lamp to earth. The test lamp should light.

If the test lamp does not light, locate the open
circuit between the battery and terminal C. Check the
fusible link which is located third from the front in the
fusible link connecting block.

(10) Connect a jumper lead between the relay
connector terminals C and D and backprobe the
control unit wiring connector terminal A6 with a test
lamp to earth.

If the test lamp lights, the EGI relay circuit can be
considered serviceable.

If the test lamp does not light locate the open
circuit between the contro l unit wiring connector
terminal A6 and the relay connector terminal D.
Repair or renew the wiring harness as necessary.

COOLANT TEMPERATURE SENSOR
To Test — Codes 14 and 15
(1) Erase the self diagnosis code memory as
previously described. (2) Start and run the engine at idle speed for 60
seconds or until the ECM warning lamp lights.
(3) Stop the engine, switch the ignition On and
connect a jumper lead between terminals A and B on
the diagnostic link connect or. Note any fault codes
displayed. If codes 14 or 15 are displayed, proceed to
operation (4).

If codes 14 or 15 are not displayed, but were
displayed when the self diagnosis test procedure was


View showing the location of the coolant temperature
sensor. 1.6 liter engine.

114 Fuel and Engine Management
(6) Check the vehicle for the following:
(a) Low fuel pressure.
(b) Contaminated fuel.
(c) Vacuum leaks at the inlet manifold, engine
vacuum hoses and engine ventilation hoses. (d) Exhaust manifold leaks before the oxygen
sensor. (e) Correct MAP sensor operation.
(f) Blocked oxygen sensor metal vent cover eg.
plugged with mud etc. (g) Fuel injectors) partially blocked. Refer to a
fuel injection specialis t or a Nissan dealer.
If the above items have been checked and no
faults have been found, a faulty oxygen sensor is
indicated. Renew the oxygen sensor, run the engine
and ensure that no fault codes are set.

To Test — Code 45
(1) Run the engine until normal operating tem-
perature is attained. (2) With the ignition switched Off, connect a
jumper lead between terminals B and A on the
diagnostic link connector. (3) Start and run the engine at approximately
1 600-1 800 rpm for 2 minutes and note the ECM
warning lamp. If the ECM warning lamp is on more than off or
flashes at the rate of twice per second, proceed to the
following operation.

If the ECM warning lamp flashes evenly at the
rate of once per second an intermittent fault is
indicated. Proceed as follows:

(a) Check for faulty wiri ng connections. Check
that all wiring connectors are clean and secure. (b) Check that all earth wires are secure.
(4) Switch the engine Off and disconnect the
oxygen sensor wiring connector. (5) Using a jumper lead, connect the oxygen
sensor wiring connector to a suitable engine earth. (6) Start and run the engine at 1 600-1 800 rpm
and note the ECM warning lamp.
If the ECM warning lamp extinguishes for at least
30 seconds, proceed to operation (7).

If the ECM warning lamp flashes on more than off
or flashes at the rate of twice per second, switch the
engine Off and disconnect the control unit wiring
connectors. Using an ohmmeter, check that there is no
resistance between the co ntrol unit wiring connector
terminal D6 and earth. Repair or renew the wiring as
necessary.

If no fault can be found in the wiring harness,
renew the control unit.

NOTE: The wiring harness for terminal D6
earths through the righ t hand rear cylinder
head bolt.

(7) Check the vehicl e for the following:
(a) High fuel pressure.
(b) Leaking injector(s).
(c) Faulty ignition wiring.
(d) Charcoal canister purge system blocked or
restricted.
(e) Faulty coolant temper ature sensor circuit.
(f) Faulty MAT sensor circuit (1.8 liter engine).
(g) MAP sensor operation.
(h) Throttle position sensor operation.

If the above items have been checked and no
faults have been found, a faulty oxygen sensor is
indicated.

Renew the oxygen sensor, run the engine and
ensure that no fault codes are set.

To Remove and Install
(1) If the engine is cold, run the engine for
approximately two minutes to allow easy oxygen
sensor removal. (2) Disconnect the negative battery terminal and
the oxygen sensor connector.

View of the oxygen sensor removed from the exhaust
manifold.
(3) Remove the exhaust manifold heat shield
retaining bolts and remove the heat shield from the
engine.
(4) Remove the oxygen sensor with a short ring
spanner using care not to damage the sensor wire. Installation is a reversal of the removal procedure
with attention to the following points:

(1) When installing a sensor that has previously
been removed, coat the sen sor threads with anti-seize
compound. Nissan recommend a mixture of liquid
graphite and glass beads. (2) Install the sensor and tighten to the specified
torque. (3) Connect the electrical connector ensuring
that the wiring is secured away from the exhaust. (4) Install the heat shield and tighten the retain-
ing bolts securely. On 1.6 liter engines, ensure that the hot air inlet
tube is located correctly be tween the heat shield and
the air cleaner housing.

(5) Start the engine and check for leaks.
VEHICLE SPEED SENSOR
To Test - Code 24

(1) Check the fuel pump and meter fuses. If the
fuses are serviceable, proceed to operation (5). If a
fuse is blown, rectify the cause and renew the fuse.

Fuel and Engine Management 115
Erase the fault codes and retest for fault codes as
follows:

(2) Start and run the engine until normal oper-
ating temperature is attained. (3) Drive the vehicle at a speed of at least 80
km/h and, with the throttle closed, allow the vehicle to
decelerate until the engine speed is below 1 500 rpm.
NOTE: After rectifying any fault it will be
necessary to retest for fault codes. To test for
Code 24 the vehicle must be driven as
previously described.

(4) Switch the engine Off and connect a jumper
lead between terminals A and B on the diagnostic link
connector. Switch the ignition On and note the fault
codes. If code 24 is displayed proceed as follows. (5) Check the operation of the speedometer and
the instrument cluster warning lamps. If the speed-
ometer only is not functioning, proceed to operation
(13).
If the speedometer and the instrument cluster
warning lamps are not functioning, a fault in the
instrument cluster wiring harness is indicated. Refer
the fault to an auto electrical workshop or a Nissan
dealer.

If the speedometer is functioning, proceed as
follows:

(6) Raise the front of the vehicle and support it
on chassis stands. (7) Place the transaxle in Neutral and switch the
ignition On. (8) With the aid of assistants, slowly spin the
front wheels by hand while backprobing the control
unit wiring connector terminal A10 with a digital
voltmeter to earth. The voltage should alternate from under 1 volt to
over 10 volts.

If the voltmeter readi ng is not as specified,
proceed to operation (9).

If the voltmeter reading is as specified, the vehicle
speed sensor is operating satisfactorily, indicating an
intermittent fault was the cause of the fault code.
Proceed as follows:

(a) Check for faulty wiri ng connections. Check
that all wiring connectors are clean and secure. (b) Check that all earth c onnections are secure.
(9) Remove the instrument cluster as described
in the Electrical System section. (10) With the ignition switched On, backprobe
the control unit wiring connector terminal A10 with a
voltmeter to earth. The voltage should be over 10
volts. If the voltage is less than specified, check the
wiring harness for shorts to earth between the black
and yellow wire terminal on the instrument cluster
wiring connector and the control unit connector
terminal A10. Repair or renew the wiring harness as
necessary. If no fault can be found, renew the control
unit.

(11) With the ignition switched On, backprobe
the black and yellow wire terminal on the instrument
cluster wiring connector with a voltmeter to earth.
The voltage should be over 10 volts.

If the voltage is less than specified, locate the open
circuit between the instrument cluster black and
yellow wire terminal and the control unit wiring
connector terminal A10. Repair or renew the wiring
harness as necessary.

(12) With a test lamp connected to 12 volts,
backprobe the black wire terminals on the instrument
cluster wiring connectors. The test lamp should light.

If the test lamp does not light locate the open
circuit between the black wire terminals and earth.
Repair or renew the wiring harness as necessary.

If the test lamp does light, renew the signal
divider circuit board which is located in the instru-
ment cluster.

(13) With the ignition switched On and the
engine not running, disconnect the vehicle speed
sensor wiring connector from the harness connector.
(14) With a test lamp connected to earth, probe
the yellow wire terminal on the harness wiring con-
nector. The test lamp should light. If the test lamp does not light, locate the open
circuit between the yellow wi re terminal and the Fuel
Pump fuse. Repair or renew the wiring harness as
necessary.

(15) With a test lamp connected to 12 volts,
probe the black wire terminal on the harness wiring
connector. The test lamp should light.

If the test lamp does not light, locate the open
circuit between the black wire terminal and earth.
Repair or renew the wiring harness as necessary.

(16) Using a voltmeter measure the voltage at the
red wire terminal on the harness wiring connector.

If the voltage is 5-9 volts proceed to operation
(19).

If the voltage is over 9 vol ts proceed to operation
(18).

Installed view of the vehicle speed sensor.

192 Electrical System
transaxle models, check for a faulty or incorrectly
adjusted neutral safety switch.

1. Discharged battery: Check for a fault or short
circuit in the system. 2. Battery fully charged but will not crank
engine. Check for a locked drive and ring gear,
internal starter faul t or seized engine.
3. Fusible link blown: Check and repair the
cause and renew as necessary.
NOTE: Rotate the engine by hand to ensure
that the starter drive is not locked with the
flywheel ring gear and t hat the engine is not
seized. Ensure that the ignition key is
turned off before rotating the engine.

3. LIGHTING SYSTEM TROUBLE SHOOTING
LAMP OR LAMPS FAIL TO LIGHT
1. Faulty bulb(s): Check and renew the faulty
bulb(s). 2. Open circuit in the wiring or connections:
Check the lamp circuits and rectify as necessary.

1. Faulty lamp switch: Check and if necessary
renew the lamp switch. 2. Faulty fuse or fuse connection: Repair the
fuse connection or renew the fuse. 3. Lamp relay faulty: Check and renew as
necessary.
NOTE: Switch on the lamps concerned and
using a test lamp, check that the lamp
circuits are operating. This is best done by
starting at the lamp wiring connector or
bulb holder and work ing back to the power
source.

LAMP OR LAMPS INCORRECTLY
ILLUMINATED

1. Lamp or lamps incorrectly earthed: Check
the lamp earth for loosene ss or clean the contact,
either at the lamp body or wire.
2. Incorrect bulbs installe d: Check the bulb
wattage and voltage and renew with the correct type if
necessary. 3. Dirty or damaged lamp reflector: Clean or
renew the lamp reflector. 4. Faulty bulb: Check with a known serviceable
bulb and renew if necessary. 5. Dirty lamp lens: Clean or renew the lamp
lens. 6. High resistance or faulty connections be-
tween the alternator and battery: Check the circuit
and rectify th e condition.
7. Poor earth connection between the battery
and the engine or alternat or: Check the battery earth
lead and the strap between the engine and the body. 8. Voltage regulator faulty: Check and renew
the voltage regulator.
NOTE: The most common cause for this
condition is dirty t erminals on the earth
leads. Check all earth leads at their earthing
points.

4. TURN SIGNAL LAMP TROUBLE SHOOTING
TURN SIGNAL LAMP DOES NOT LIGHT AND
NO AUDIBLE NOISE FROM FLASHER UNIT

(1) Fuse blown: Rectify the fault and renew the
fuse.

(2) The Flasher unit is faulty: Renew the unit
(3) Turn signal switch faulty: Renew the switch
(4) Fault in the wiring circuit: Check and repair
the fault.

TURN SIGNAL WARNING LAMP DOES NOT
FLASH BUT AUDIBLE CLICKING FROM
FLASHER UNIT

(1) Warning lamp bulb blown: Check and renew
the bulb.

Checking the rear combination lamp circuit using a test
lamp.
Checking the headlamp circuit using a test lamp.

Electrical System 193


Installed view of the stop lamp switch and the flasher
unit.
(2) Fault in the warning lamp wiring: Check and
repair the fault.

NOTE: When renewing bulbs ensure that a
new bulb of the correct wattage is used.

TURN SIGNAL LAMPS FLASH WEAKLY AND
AT GREATER THAN NORMAL SPEED

1. Faulty flasher unit: Check and renew the
flasher unit.
2. Front or rear bulb blown on the turn side:
Check and renew the bulb.
NOTE: If the flasher unit is to be renewed,
always try to obtain a genuine replacement
part.

HAZARD WARNING LAMPS DO NOT
OPERATE

Fuse blown: Rectify the fault and renew as
necessary.
Flasher unit faulty: Re new the flasher unit.
Hazard warning switch faulty: Renew the
switch.
Fault in the wiring circuit: Check and repair
the fault.
5. TEST EQUIPMENT AND SOME APPLICATIONS

Special Equipment Required:
To Make Test Lamp or Jumper Lead — Soldering
iron

When working on the electrical system, a test
lamp and jumper leads can be very useful to check
circuits.

TO MAKE A JUMPER LEAD
The minimum materials required to make a
jumper lead are one length of 4 mm wire and two
small alligator clips.

Grouping of materials to construct jumper leads of
various sizes.
Bare both ends of a suitable length of 4 mm
wire. Connect a small alligato r clip to each end of
the wire. Solder and tape the connections. Test the jumper lead for continuity by re-
moving one battery cable and connecting the lead
between the cable and the battery terminal. Turn the
ignition On and the dashboard warning lamps should
operate indicating a completed circuit through the
jumper lead. Remove the jumper lead from the circuit and
reconnect the battery.
NOTE: Make a few jumper leads of various
lengths using different sizes and types of
alligator and battery clips.

TO MAKE A TEST LAMP
Due to the extensive use of electronic components
in the electrical system, an LED (light emitting diode)
test lamp can be made from a suitable length of 3 mm
wire, an alligator clip, an LED, a 1/4 watt 560 ohm
resistor, a suitable case such as an old ball point pen
case and a length of rod or wire sharpened to form a
probe.

(1) Solder the length of wire to the K (cathode)

194 Electrical System


Schematic of LED test lamp. Ensure that the connec-
tions to the K (cathode) lead and A (anode) lead of the LED are as illustrated.
lead of the LED. The K lead is the shorter of the two
leads and is adjacent to the flat on the LED.

Solder the 560 ohm resister to the A (anode)
lead of the LED. Solder a short length of wire to the other lead
of the resistor and to the probe. Drill a hole in the side of the case to accept
the wire attached to the K lead of the LED. Mount the probe in the case. If using a pen
case, push the probe through the lower end of the pen
after removing the refill. Push the lead attached to the K lead of the
LED through the hole made in the side of the case and
solder the alligator clip to the lead.
Mount the LED to the case. If using a pen
case, the LED may be mounted in the plug at the top
of the pen after drilling the plug to accept the LED. Suitably attach the probe to the case using
adhesive or tape.
TO TEST SWITCHES

Disconnect the wires from the switch.
Using a test lamp, test each wire to locate the
power wire. It may be nec essary to turn the ignition
On as the switch may be wired through the ignition
circuit. Disconnect the test lamp and connect a jumper lead between the power wire and the wire
from the other side of the switch.

If the circuit functions, the switch can be consid-
ered faulty and should be renewed. Refer to the
heading Switches and Controls.

TO TEST BULBS
Remove the bulb from the bulb holder.
Connect a jumper lead between the positive
terminal of a battery a nd the base of the bulb.
Connect another jumper lead between the
negative battery terminal and the contact on the base
of the bulb. The bulb should illuminate. If the bulb has two filaments, connect the jumper
lead to the second contact on the base of the bulb. The
second filament should illuminate.

If the bulb fails to illuminate, it should be
renewed with a bulb of the correct voltage and
wattage.

TO TEST CIRCUITS
Turn the circuit switch On.
Using a test lamp, check for power at one of
the circuit connections. A fuse is a good starting point.
If power is available, reconnect the connector and
continue checking towards the motor or bulb end of
the circuit.

If power is not available, continue checking
towards the battery or switch end of the circuit.

6. BATTERY
Special Equipment Required: To Test — Hydrometer
To Charge — Battery charger

TO REMOVE AND INSTAL
(1) Disconnect the negative and positive battery
terminals.

Installed view of the battery.

Electrical System 207

Disconnect the wiring connectors from the
rear of the combination switch.
Loosen the clamping screw located at the left
hand side of the combination switch. Push, turn and slide the combination switch
from the steering column. Installation is a reversal of the removal procedure.

REAR WINDOW DEMISTER
SWITCH/HAZARD WARNING LAMP SWITCH

To Remove and Install
Disconnect the negative battery terminal.
Using two small flat bladed screwdrivers,
carefully lever the edges of the switch forward to
release it from the instrument cluster surround.
Withdraw the switch from the surround and
disconnect the switch wiri ng at the connectors.
Installation is a reversal of the removal procedure.


View of the hazard warning switch removed from the
instrument cluster surround.
DOOR LOCKS AND POWER WINDOW
SWITCHES

To Remove and Install
Disconnect the negative battery terminal.
Loosen the retaining screws securing the
armrest to the door. Using a small flat bladed screwdriver, care-
fully lever the front edge of the switch panel up and
maneuver the switch forward and away from the
armrest. Disconnect the wiring connector and remove
the switch from the armrest. Installation is a reversal of the removal procedure.

POWER MIRRORS AND INSTRUMENT
ILLUMINATION SWITCHES

To Remove and Install
Disconnect the negative battery terminal.
Using two small flat bladed screwdrivers,

View of the power mirror switch removed from the
vehicle.
carefully lever the edges of the switch forward to
release it from the fascia lo cated directly above the
fuse box.

(3) Withdraw the switch from the fascia and
disconnect the wiring.

Installation is a reversal of the removal procedure.
REAR WINDOW WIPER/WASHER SWITCH
To Remove and Install
Disconnect the negative battery terminal.
Using two small flat bladed screwdrivers,
carefully lever the edges of the switch forward to
release it from the instrument cluster surround. Withdraw the switch from the surround and
disconnect the wiring.
Installation is a reversal of the removal procedure.


View of the rear window wiper/washer switch re-
moved from the vehicle.

Electrical System 215
Ensure that the wiper motor is in the Park
position before installing the wiper arm. If in doubt,
turn the wiper switch to the Off position and turn the
ignition switch to the On position until the wiper
motor stops.
Install the wiper arm to the pivot so that the
wiper blade is horizontal to the lower edge of the edge
of the rear window when in the Park position.
17. FUSES, FUSIBLE LINKS AND RELAYS

TO CHECK AND RENEW FUSE
NOTE: If a fuse is found to be faulty or
burnt out, use a replacement fuse of the
specified amperage only. The specified amp-
erage is marked on the fuse.

The use of a higher amperage fuse than
that specified could cause damage to the
vehicle wiring harness.

The fuses are mounted in a fuse box
located in the lower right hand corner of the
dashboard.

Remove the cover from the lower right hand
corner of the dashboard and using the information
marked on the fuse box, locate the fuse protecting the
circuit at fault. Pull the fuse out of the fuse box and inspect
it for serviceability.
Should the fuse appear to be in a serviceable
condition, test its continuity with an ohmmeter or test
lamp. Should the fuse be faulty or burnt out,
install
a new fuse of the same amperage. If the circuit is still inoperative or the fuse
burns out again, test the circuit as previously de-
scribed in this section or refer the problem to an
automotive electrician.
TO CHECK AND RENEW FUSIBLE LINK

NOTE: If a fusible link is found to be faulty
or burnt out, use a genuine replacement
fusible link of the specified amperage only.

The use of a higher amperage fusible link
than that specified could cause damage to
the vehicle wiring harness.

A new fusible link should never be in-
stalled until the fault which caused the
original link to fail has been repaired.

The fusible links installed to protect the
vehicles wiring system are located adjacent
to the washer bottle on the right hand inner
mudguard.

Disconnect the negative battery terminal
Check the fusible link visually for service-
ability.
Should the fusible link appear to be in a
serviceable condition, test its continuity using
an
ohmmeter or a test lamp. If the fusible link proves to be faulty, install
a
new fusible link and have an assistant temporarily
connect the battery while the circuit is checked for
operation.


View of the fuse box cover showing the fuse identifi-
cation label. Installed view of the fusible links.
View of the fuse box.