1998 NISSAN PICK-UP Repair Manual

RHD MODELS
HEC352
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Injector (Cont'd)
EC-145

COMPONENT DESCRIPTION
The fuel injector is a small, precise solenoid valve. When the
ECM supplies a ground to the injector circuit, the coil in the
injector is energized. The energized coil pulls the needle valve
back and allows fuel to flow through the injector into the intake
manifold. The amount of fuel injected depends upon the injection
pulse duration. Pulse duration is the length of time the injector
remains open. The ECM controls the injection pulse duration
based on engine fuel needs.
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)
101
103
110
112W/B
W/R
W/L
W/GInjector No. 1
Injector No. 3
Injector No. 2
Injector No. 4Engine is running.
(Warm-up condition)
Idle speedBATTERY VOLTAGE
(11 - 14V)
SEF069U
Engine is running.
Engine speed is 2,000 rpm.BATTERY VOLTAGE
(11 - 14V)
SEF070U
SEF596K
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Injector (Cont'd)
EC-146

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK OVERALL FUNCTION.
1. Start engine.
2. Perform ``POWER BALANCE''
in ``ACTIVE TEST'' mode with
CONSULT.
3. Make sure that each circuit pro-
duces a momentary engine
speed drop.
----------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------
2. Listen to each injector operat-
ing sound.
Clicking noise should be
heard.
NG
cOK
INSPECTION END
CHECK POWER SUPPLY.
1. Stop engine.
2. Disconnect injector harness connector.
3. Turn ignition switch ``ON''.
4. Check voltage between terminal
V2
and ground with CONSULT or tester.
Voltage: Battery voltage
OK
cNG
Check the following.
lHarness connectorsF55,M47(RHD mod-
els)
lHarness for open or
short between injector
and ignition switch
If NG, repair harness or
connectors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Disconnect ECM harness connector.
3. Check harness continuity between ter-
minal
V1and ECM terminals101,103,110,112.
Continuity should 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.
CHECK COMPONENT
(Injector).
Refer to ``COMPONENT INSPECTION''
on next page.
OK
cNG
Replace injector.
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
SEF102U
SEF730L
SEF103U
SEF104U
SEF105U
.
.
.
.
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Injector (Cont'd)
EC-147

COMPONENT INSPECTION
Injector
1. Disconnect injector harness connector.
2. Check resistance between terminals as shown in the figure.
Resistance: 10 - 14Wat 25ÉC (77ÉF)
If NG, replace injector.
SEF106U
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Injector (Cont'd)
EC-148

Start Signal
HEC350
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
EC-149

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK OVERALL FUNCTION.
1. Turn ignition switch ``ON''.
2. Perform ``START SIGNAL CKT''
in ``FUNCTION TEST'' mode
with CONSULT.
----------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch ``ON''.
2. Check ``START SIGNAL'' in
``DATA MONITOR'' mode with
CONSULT.
----------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch to
``START''.
2. Check voltage between ECM
terminal
V34and ground.
Voltage:
Ignition switch ``START''
Battery voltage
Except above
Approximately 0V
NG
cOK
INSPECTION END
Check if 7.5A fuse is OK.
OK
cNG
Replace 7.5A fuse.
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Disconnect ECM harness connector
and 7.5A fuse.
3. Check harness continuity between
ECM terminal
V34and fuse block.
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 for open or
short between ECM and
fuse block
If NG, 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.
INSPECTION END
IGN ``ON'' OFF
IGN ``START'' ON
SEF191L
SEF153U
SEF107U
SEF108U
.
.
.
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Start Signal (Cont'd)
EC-150

Fuel Pump
SYSTEM DESCRIPTION
Camshaft position sensorcEngine speed
ECM
(ECCS
control
mod-
ule)
cFuel
pump
relay
Ignition switchcStart signal
The ECM activates the fuel pump for several sec-
onds after the ignition switch is turned on to
improve engine startability. If the ECM receives a
180É signal from the camshaft position sensor, it
knows that the engine is rotating, and causes the
pump to operate. If the 180É signal is not received
when the ignition switch is on, the engine stalls.
The ECM stops pump operation and prevents bat-
tery discharging, thereby improving safety. The
ECM does not directly drive the fuel pump. It con-
trols the ON/OFF fuel pump relay, which in turn
controls the fuel pump.Condition Fuel pump operation
Ignition switch is turned to ON.Operates for
5 seconds.
Engine running and cranking Operates.
When engine is stopped Stops in 1 second.
Except as shown above. Stops.
COMPONENT DESCRIPTION
The fuel pump with a fuel damper is an in-tank type (the pump
and damper are located in the fuel tank).
CONSULT REFERENCE VALUE IN DATA MONITOR MODE
Remarks: Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
FUEL PUMP RLY
lIgnition switch is turned to ON (Operates for 5 seconds).lEngine running and crankinglWhen engine is stopped (Stops in 1 second)ON
Except as shown above OFF
SEF476P
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
EC-151

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)
104 W/R Fuel pump relayIgnition switch ``ON''
For 5 seconds after turning ignition switch
``ON''
Engine is running.Approximately 1V
Ignition switch ``ON''
5 seconds after turning ignition switch ``ON''BATTERY VOLTAGE
(11 - 14V)
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Fuel Pump (Cont'd)
EC-152