Nissan PULSAR N13 Series / ASTRA LD Series. Manual — part 28

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 the 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 engine 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 the 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 wiring 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 engine 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 connector 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 engine 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 wiring 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 proceed 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.

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 specialist 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 wiring 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 control 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 right hand rear cylinder
head bolt.

(7) Check the vehicle 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 temperature 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 sensor 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 between 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 reading 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 wiring connections. Check

that all wiring connectors are clean and secure.

(b) Check that all earth connections 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 wire 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 volts proceed to operation

(18).

Installed view of the vehicle speed sensor.

116

Fuel and Engine Management

Rear view of the instrument cluster showing the

flexible printed circuit.

If the voltage is under 5 volts proceed as follows.

(17) Check the wiring harness for continuity or

shorts to earth between the red wire terminal on the
speed sensor harness connector and the green and
black wire terminal on the instrument cluster wiring
connector.

If no fault can be found check the instrument

cluster printed circuit for continuity or shorts. If no
fault can be found, renew the speedometer and the
signal divider circuit board.

(18) Remove the instrument cluster as described

in the Electrical System section and repeat operation
(16).

If the voltage is under 1 volt, check the flexible

printed circuit on the rear of the instrument cluster for
continuity or shorts and renew as necessary. If no fault
can be found, renew the speedometer and the signal
divider circuit board.

(19) Connect the harness connector to the vehicle

speed sensor wiring connector.

(20) Raise the front of the vehicle and support it

on chassis stands. Place the transaxle in Neutral.

(21) With the aid of assistants, slowly spin the

front wheels by hand while backprobing the brown
wire terminal on the vehicle speed sensor wiring
connector with a voltmeter to earth.

The voltage should alternate between approxi-

mately 1 and 7 volts.

If the voltage is as specified, check the flexible

printed circuit on the rear of the instrument cluster for
continuity or shorts. If no fault can be found, renew
the speedometer and the signal divider circuit board.

If the voltage is not as specified, proceed as

follows.

(22) Disconnect the vehicle speed sensor wiring

connector and unscrew the sensor from the speedom-
eter drive housing.

(23) Rotate both front wheels in the same direc-

tion and check that the speedometer drive shaft is
turning and does not slip.

If the drive shaft does not operate as described,

renew the drive assembly as described in the Manual
or Automatic Transaxle section.

If the drive shaft operates satisfactorily, renew the

vehicle speed sensor.

To Remove and Install

(1) Disconnect the negative battery terminal.
(2) Disconnect the vehicle speed sensor wiring

connector.

(3) Unscrew the vehicle speed sensor from the

speedometer drive housing.

Installation is a reversal of the removal procedure

with attention to the following points:

(1) Align the cut-out in the speedometer drive

shaft with the notch in the vehicle speed sensor shaft.

(2) Tighten the vehicle speed sensor securely.