NISSAN PICK-UP 1998 Repair Manual

LHD MODELS
HEC407
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Vehicle Speed Sensor (VSS) (Cont'd)
EC-119

RHD MODELS
HEC408
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Vehicle Speed Sensor (VSS) (Cont'd)
EC-120

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK OVERALL FUNCTION.
1. Lift up the vehicle.
2. Start engine.
3. Perform ``VEHICLE SPEED
SEN CKT'' in ``FUNCTION
TEST'' mode with CONSULT.
----------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------
2. Start engine.
3. Read ``VHCL SPEED SE'' sig-
nal in ``DATA MONITOR'' mode
with CONSULT.
The vehicle speed on CON-
SULT should be able to
exceed 10 km/h (6 MPH)
when rotating wheels with
suitable gear position.
----------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------
2. Turn ignition switch ``ON''.
3. Rotate drive wheel by hand.
4. Check voltage between ECM
terminal
V32and ground.
Voltage should vary between
approx.0-5V.
NG
cOK
INSPECTION END
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Disconnect ECM harness connector
and combination meter harness con-
nector.
3. Check harness continuity between
ECM terminal
V32and terminalV34.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
cNG
Check the following.
lHarness connectorsF54,M48(RHD mod-
els)
lHarness connectorsM6,N1
lHarness for open or
short between ECM and
combination meter
If NG, repair open circuit,
short to ground or short to
power in harness or con-
nectors.
CHECK SPEEDOMETER FUNCTION.
Make sure that speedometer functions
properly.
OK
cNG
Check the following.
lHarness for open or
short between combina-
tion meter and vehicle
speed sensor
If NG, repair harness or
connectors.
lVehicle speed sensor
and its circuit
(Refer to EL section.)
VA
MEF559D
SEF941N
SEF163U
SEF090U
.
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Vehicle Speed Sensor (VSS) (Cont'd)
EC-121

VA
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM harness
connector and retest.
INSPECTION END
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Vehicle Speed Sensor (VSS) (Cont'd)
EC-122

Heated Oxygen Sensor (HO2S)
Ð LHD Models Ð
COMPONENT DESCRIPTION
The heated oxygen sensor is placed into the front exhaust tube.
It detects the amount of oxygen in the exhaust gas compared to
the outside air. The heated oxygen sensor has a closed-end tube
made of ceramic zirconia. The zirconia generates voltage from
approximately 1V in richer conditions to 0V in leaner conditions.
The heated oxygen sensor signal is sent to the ECM. The ECM
adjusts the injection pulse duration to achieve the ideal air-fuel
ratio. The ideal air-fuel ratio occurs near the radical change from
1V to 0V.
CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
O2 SEN
lEngine: After warming up Maintaining engine speed at 2,000 rpm 0 - 0.3V«0.6 - 1.0V
ECM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values, and are measured between each terminal andV39(ECCS ground) with a voltme-
ter.
TER-
MINAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC voltage)
19 W Heated oxygen sensorEngine is running.
After warming up sufficiently and engine speed
is 2,000 rpm.0 - Approximately 1.0V
(periodically change)
SEF463R
SEF288D
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
EC-123

HEC561
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Heated Oxygen Sensor (HO2S)
Ð LHD Models Ð (Cont'd)
EC-124

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK HEATED OXYGEN SENSOR
CIRCUIT.
1. Start engine and warm it up suffi-
ciently.
2. Perform ``MIXTURE RATIO
TEST'' in ``FUNCTION TEST''
mode with CONSULT.
----------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------
2. Make sure that ``M/R F/C MNT''
in ``DATA MONITOR'' mode
indicates ``RICH'' and ``LEAN''
periodically more than 5 times
during 10 seconds at 2,000
rpm.
----------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------
2. Stop engine and set ECM Diag-
nostic Test Mode II (Heated
oxygen sensor monitor).
3. Restart engine and run it at
about 2,000 rpm for about 2
minutes under no-load.
4. Keep engine speed at 2,000
rpm and make sure that the
malfunction indicator lamp on
the instrument panel comes on
more than 5 times during each
10 seconds.
NG
cOK
INSPECTION END
VA
SEF091U
SEF815L
SEF052U
SEF051PA
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Heated Oxygen Sensor (HO2S)
Ð LHD Models Ð (Cont'd)
EC-125

VA
CHECK SHIELD CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Loosen and retighten engine ground
screws.
3. Remove joint connector
M31.
4. Check the following.
lContinuity between joint connector
terminal
V1and ground
lJoint connector
(Refer to ``HARNESS LAYOUT'' in
EL section.)
Continuity should exist.
If OK, check harness for short to
ground and short to power. Then
reconnect joint connector.
OK
cNG
Repair open circuit, short
to ground or short to
power in harness or con-
nectors.
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Disconnect heated oxygen sensor har-
ness connector and ECM harness con-
nector.
3. Check harness continuity between
ECM terminal
V19and terminalV2.
Continuity should exist.
4. Check harness continuity between
ECM terminal
V19(or terminalV2) and
ground.
Continuity should not exist.
If OK, check harness for short to
ground and short to power.
OK
cNG
Repair open circuit, short
to ground or short to
power in harness or con-
nectors.
Disconnect and reconnect harness con-
nectors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage
and check the connection of ECM har-
ness connector. Reconnect ECM harness
connector and retest.
OK
cNG
Replace heated oxygen
sensor.
INSPECTION END
SEF076U
SEF092U
.
.
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Heated Oxygen Sensor (HO2S)
Ð LHD Models Ð (Cont'd)
EC-126

Heated Oxygen Sensor Heater
Ð LHD Models Ð
SYSTEM DESCRIPTION
Camshaft position sensorcEngine speedECM
(ECCS
control
mod-
ule)c
Heated
oxygen
sensor
heater
The ECM performs ON/OFF control of the heated
oxygen sensor heater corresponding to the engine
speed.OPERATION
Engine speed rpm Heated oxygen sensor heater
Above 3,200 OFF
Below 3,200 ON
ECM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values, and are measured between each terminal andV39(ECCS ground) with a voltme-
ter.
TER-
MINAL
NO.WIRE
COLORITEM CONDITIONDATA
(DC voltage)
114 RHeated oxygen sensor
heaterEngine is running.
Engine speed is below 3,200 rpm.Approximately 0V
Engine is running.
Engine speed is above 3,200 rpm.BATTERY VOLTAGE
(11 - 14V)
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
EC-127

HEC561
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Heated Oxygen Sensor Heater
Ð LHD Models Ð (Cont'd)
EC-128