1998 NISSAN PICK-UP engine

ON BOARD DIAGNOSIS LOGIC
Diagnostic
Trouble
Code No.Malfunction is detected when ...Check Items
(Possible Cause)
43
lAn excessively low or high voltage from the sensor is
sent to ECM.*lHarness or connectors
(The sensor circuit is open or shorted.)
lThrottle position sensor
*: When this malfunction is detected, the ECM enters fail-safe mode.
Engine operating condition in fail-safe mode Condition Driving condition
Throttle position will be determined based on the
amount of mass air flow and the engine speed.
Therefore, acceleration will be poor.When engine is idling Normal
When accelerating Poor acceleration
OVERALL FUNCTION CHECK
Use this procedure to check the overall function of the throttle
position sensor circuit. During this check, a DTC might not be
confirmed.
1) Start engine and warm it up sufficiently.
2) Turn ignition switch ``OFF'' and wait at least 5 seconds.
3) Turn ignition switch ``ON''.
4) Select ``THRTL POS SEN'' in ``DATA MONITOR'' mode
with CONSULT.
5) Read ``THRTL POS SEN'' signal and check the follow-
ing:
lThe voltage when accelerator pedal fully released is
approximately 0.35 - 0.65V.
lThe voltage when accelerator pedal fully depressed
is approximately 4V.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------OR-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1) Start engine and warm it up sufficiently.
2) Turn ignition switch ``OFF'' and wait at least 5 seconds.
3) Turn ignition switch ``ON''.
4) Check the voltage between ECM terminals
V20andV39
(ground) and check the following:
lThe voltage when accelerator pedal fully released is
approximately 0.35 - 0.65V.
lThe voltage when accelerator pedal fully depressed
is approximately 4V.
SEF770T
SEF771T
SEF087U
TROUBLE DIAGNOSIS FOR ``THROTTLE POSI SEN'' (DTC 43)KA
Throttle Position Sensor (Cont'd)
EC-114

DIAGNOSTIC PROCEDURE
INSPECTION START
ADJUST THROTTLE POSITION SEN-
SOR.
Perform BASIC INSPECTION, EC-58.
OK
CHECK SHIELD CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Loosen and retighten engine ground
screws.
3. Remove joint connector
M31orF53.
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 POWER SUPPLY.
1. Disconnect throttle position sensor har-
ness connector.
2. Turn ignition switch ``ON''.
3. Check voltage between terminal
V1
and ground with CONSULT or tester.
Voltage: Approximately 5V
OK
cNG
Check the following.
lHarness connectorsM205,M301(LHD mod-
els)
F5,F101(RHD mod-
els)
lHarness for open or
short between throttle
position sensor and
ECM
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Check harness continuity between ter-
minal
V3and engine ground.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
cNG
Check the following.
lHarness connectorsM205,M301(LHD mod-
els)
F5,F101(RHD mod-
els)
lHarness for open or
short between throttle
position sensor and
ECM
If NG, repair open circuit,
short to ground or short to
power in harness or con-
nectors.
VA
SEF076U
SEF160U
SEF107S
SEF108S
.
.
.
.
.
TROUBLE DIAGNOSIS FOR ``THROTTLE POSI SEN'' (DTC 43)KA
Throttle Position Sensor (Cont'd)
EC-116

VA
CHECK INPUT SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between
ECM terminal
V20and terminalV2.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
cNG
Check the following.
lHarness connectorsM205,M301(LHD models)
F5,F101(RHD models)
lHarness for open or short
between throttle position
sensor and ECM
If NG, repair open circuit,
short to ground or short to
power in harness or connec-
tors.
CHECK COMPONENT
(Throttle position sensor).
Refer to ``COMPONENT INSPECTION''
below.
OK
cNG
Replace throttle position
sensor. To adjust it, perform
BASIC INSPECTION,
EC-58.
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
COMPONENT INSPECTION
Throttle position sensor
1. Start engine and warm it up sufficiently.
2. Turn ignition switch ``OFF''.
3. Disconnect throttle position sensor harness connector.
4. Make sure that resistance between terminals
V2andV3
changes when opening throttle valve manually.
Throttle valve conditions Resistance at 25ÉC (77ÉF)
Completely closed Approximately 0.6 kW
Partially open 0.6 - 4.0 kW
Completely open Approximately 4 kW
If NG, replace throttle position sensor.
To adjust throttle position sensor, perform ``BASIC
INSPECTION'', EC-58.
SEF088U
SEF161U
.
.
.
.
.
TROUBLE DIAGNOSIS FOR ``THROTTLE POSI SEN'' (DTC 43)KA
Throttle Position Sensor (Cont'd)
EC-117

Vehicle Speed Sensor (VSS)
COMPONENT DESCRIPTION
The vehicle speed sensor is installed in the transmission. It con-
tains a pulse generator which provides a vehicle speed signal to
the speedometer. The speedometer then sends a signal to the
ECM.
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)
32 W/L Vehicle speed sensorEngine is running.
Jack up all wheels and run engine at idle in
1st position.Varies from 0 to 5V
SEF068U
SEF089U
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
EC-118

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

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

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