1987 NISSAN PULSAR warning light

Fuel and Engine Management 113
(2) Disconnect the wiring connector from the
MAT sensor.

(3) Unscrew the sensor from the inlet manifold.
Installation is a reversal of the removal procedure

with attention to the following points:
(1) Apply Loctite 567 or a similar conductive
sealer to the threads of th e sensor. Tighten the sensor
to the specified torque. (2) Ensure that the wiring connector is clean and
tight.
OXYGEN SENSOR

To Test - Code 13
(1) Run the engine until the normal operating
temperature is obtained. (2) With the ignition switched Off, connect a
jumper lead between terminals A and B on the
diagnostic link connector.
(3) Start and run the engi ne at approximately
1 600-1 800 rpm for 2 minutes and note the ECM
warning lamp.
If the ECM warning lamp flashes at the rate of
twice per second, proceed to operation (5).

If the ECM warning lamp flashes at the rate of
once per second or slower, proceed as follows.

(4) Remove the jumper lead from the diagnostic
link connector and run th e engine above 2 000 rpm
for 2 minutes, noting the ECM warning lamp.

If the ECM warning lamp lights, stop the engine,
switch the ignition On and connect a jumper lead
between terminals A and B on the diagnostic link
connector. If code 13 is displayed proceed to opera-
tion (5).

If the ECM warning lamp does not light, 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.
(5) Switch the ignition Off and disconnect the
oxygen sensor wiring connector. Using a jumper lead
connect the oxygen sensor wiring connector to a
suitable engine earth. (6) Start and run the engi ne at approximately
1 600-1 800 rpm and note the ECM warning lamp.
The lamp may flash for a few seconds but should then
extinguish for at least 30 seconds.
If the ECM warning lamp functions as described,
proceed to operation (7).

If the ECM warning lamp does not function as
described proceed as follows:

(a) Check the wiring harness between the oxygen
sensor wiring connector and the control unit wiring
connector D7 for open circuits. Repair or renew the
wiring harness as necessary.

{b) Check the earth circuit between the control
unit wiring connect D6 and the right rear cylinder
head bolts. Repair or renew the wiring harness as
necessary.

(c) If no fault is found in (a) and (b) renew the
control unit and retest for fault codes.

(7) Check the wiring harness earth circuit be-
tween the control unit wiring connector D6 and the
right rear cylinder head bolts. Repair or renew the
wiring harness as necessary.

If no fault is found, thoroughly check the oxygen
sensor connector. If the conne ctor is not faulty, renew
the oxygen sensor.

To Test - Code 44
(1) Run the engine until normal operating tem-
perature is attained.
(2) With the ignition switched Off, connect a
jumper lead between terminals A and B on the
diagnostic link connector. (3) Start and run the engi ne at approximately
1 600-1 800 rpm for 2 minutes and note the ECM
warning lamp. If the ECM warning lamp is off more than on or
flashes at the rate of twice per second, proceed to
operation (4).

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) Start and run the engine at 1 600-1 800 rpm
for at least 30 seconds and note the ECM warning
lamp. If the ECM warning lamp flashes at the rate of
twice per second procee d to operation (6).

If the ECM warning lamp extinguishes for at least
30 seconds, check the wiring harness between the
oxygen sensor wiring connector and the control unit
wiring connector terminal D7 for shorts to earth.

Repair or renew the wiring harness as necessary.
If no fault can be found in the wiring harness, renew
the control unit.

Installed view of the oxygen sensor.

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)

220 Electrical System


Wiring diagram (WD2) for the instruments, hazard and turning signal systems.
COLOUR CODE
The first letter of the code
represents the main wire color,
the other letters represent the
trace colors.

B - BLACK
L - BLUE
G - GREEN
R - RED
Y - YELLOW
W- WHITE
N - BROWN
O - OHANGE
K - PINK
S - GREY V -VIOLET
P - PURPLE X - LIGHT GREEN Z - LIGHT BLUE M - DARK GREEN T - DARK BLUE A - LIGHT BROWN E - SLATE D - TAN
KEY 1. Fuse 11 Ignition
2. Speedometer
3. Vehicle speed sensor
4. To No. 21 WD1
5. To ECU A10
6. To No. 13 WD1
7. Tachometer
8. Voltage regulator
9. Resistor
10. Temperature gauge
11. Fuel gauge
12. Temperature sender
13. Fuel sender
14. To ECM lamp
15. Oil lamp
16. Park brake lamp
17. Low fuel lamp
18. To ECU A5
19. To No. 20 WD1
20. Park brake switch
21. Low fuel switch
22. Brake switch
23. Brake fail lamp
24. Bulb check relay
25. Charge lamp
26. Door ajar lamp
27. To No. 6 VWD1
28. To No. 8 WD4
29. To No. 18 WD6
30. To No. 17 WD6 31. Hazard switch

32. Flasher unit
33. Turn signal switch
34. L H front combination
lamp
35. L H side indicator lamp
36. L H rear combination lamp
37. L H instrument warning
lamp
38. R H instrument warning lamp
39. R H rear combination lamp
40. R H side indicator lamp
41. R H front combination lamp
42. Divider circuit

Electrical System 221

Wiring diagram (WD3) for the fan switch, blower, air conditioning, rear demister and power
window circuits.
COLOUR CODE
The first letter of tha code
represents the main wire color,
the other letters represent the
trace colours.
B - BLACK
L - BLUE
G - GREEN
R - BED
Y - YELLOW
W - WHITE
N - BROWN
0 - ORANGE
K - PINK
S - GREY
V - VIOLET
P - PURPLE
X - LIGHT GREEN
Z - LIGHT BLUE
M - DARK GREEN
T - DARK BLUE
A - LIGHT BROWN
E - SLATE
D - TAN KEY

1. Blower fan motor
2. To No. 11 WD5
3. Resistors
4. Blower fan switch
5. To ECU C2
6. Air conditioning switch
7. Thermo amplifier
8. Pressure switch
9. Air conditioning relay No. 2
10. Compressor
11. Air conditioning relay No. 1
12. To ECU B8
13. Air conditioning relav No. 3
14. Condenser fan
15. Cooling Ian relay
16. Fuse 22 BATT
17. Fuse 10 Ignition
18. To ECU C1
19. Rear demister switch
20. Cooling fan motor
21. Rear demister
22. Rear demister warning lamp
23. Power window relay
24. Circuit breaker
25. R H front power
window motor
26. Power window amplifier
27. R H front power window switch
28. Door lock switch
29. Main power window switch
30. L H front power
window switch
31. R H rear power window switch
32. L H rear power window switch
33. L H front power
window motor
34. R H rear power window motor
35. L H rear power window motor