1998 NISSAN PICK-UP relay

DIAGNOSTIC PROCEDURE
INSPECTION START
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 mass air flow sensor har-
ness connector.
2. Turn ignition switch ``ON''.
3. Check voltage between terminal
V3
and ground with CONSULT or tester.
Voltage: Battery voltage
OK
cNG
Check the following.
lHarness connectorsM5,E101
lHarness connectorsF54,M48(RHD mod-
els)
lHarness for open or
short between mass air
flow sensor and ECM
lHarness for open or
short between mass air
flow sensor and ECCS
relay
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Disconnect ECM harness connector.
3. Check harness continuity between ter-
minal
V2and ECM terminalV17.
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 INPUT SIGNAL CIRCUIT.
Check harness continuity between termi-
nal
V1and ECM terminalV16.
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.
VA
SEF076U
SEF150U
SEF079U
SEF080U
SEF081U
.
.
.
.
.
TROUBLE DIAGNOSIS FOR ``MASS AIR FLOW SEN'' (DTC 12)KA
Mass Air Flow Sensor (MAFS) (Cont'd)
EC-93

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

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK OVERALL FUNCTION.
1. Turn ignition switch ``ON''.
2. Pinch fuel feed hose with fingers.
Fuel pressure pulsation should be
felt on the fuel feed hose for 5 sec-
onds after ignition switch is turned
``ON''.
NG
cOK
INSPECTION END
CHECK POWER SUPPLY.
1. Turn ignition switch ``OFF''.
2. Disconnect fuel pump relay.
3. Turn ignition switch ``ON''.
4. Check voltage between terminals
V1,
V3and ground with CONSULT or
tester.
Voltage: Battery voltage
OK
cNG
Check the following.
l15A fuse
lHarness connectorsE101,M5
lHarness for open or
short between fuse and
fuel pump relay
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Disconnect fuel pump harness connec-
tor.
3. Check harness continuity between ter-
minal
V6and body ground, relay ter-
minal
V5and terminalV5.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
cNG
Check the following.
lHarness connectorsC9,M121(LHD mod-
els for Europe)
lHarness connectorsE101,M5
lHarness for open or
short between fuel pump
and body ground
lHarness for open or
short between fuel pump
and fuel pump relay
If NG, repair open circuit,
short to ground or short to
power in harness or con-
nectors.
CHECK OUTPUT SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between
ECM terminal
104and terminalV2.
Continuity should exist.
If OK, check harness for short to
ground and short to power.
OK
cNG
Check the following.
lHarness connectorsE101,M5
lHarness connectorsM48,F54(RHD mod-
els)
lHarness for open or
short between ECM and
fuel pump relay
If NG, repair open circuit,
short to ground or short to
power in harness or con-
nectors.
VA
(Go to next page.)
SEF109U
SEF110U
SEF479P
SEF154U
.
.
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Fuel Pump (Cont'd)
EC-155

VA
CHECK COMPONENT
(Fuel pump relay).
1. Reconnect fuel pump relay, fuel
pump harness connector and
ECM harness connector.
2. Turn ignition switch ``ON''.
3. Turn fuel pump relay ``ON'' and
``OFF'' in ``ACTIVE TEST''
mode with CONSULT and
check operating sound.
----------------------------------------------------------------------------------------------------------------------------------OR----------------------------------------------------------------------------------------------------------------------------------
Refer to ``COMPONENT INSPEC-
TION'' below.
OK
cNG
Replace fuel pump relay.
CHECK COMPONENT
(Fuel pump).
Refer to ``COMPONENT INSPECTION''
below.
OK
cNG
Replace fuel pump.
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
Fuel pump relay
Check continuity between terminalsV3andV5.
Conditions Continuity
12V direct current supply
between terminals
V1andV2Yes
No current supply No
If NG, replace relay.
Fuel pump
1. Disconnect fuel pump harness connector.
2. Check resistance between terminals
V5andV6.
Resistance: 0.2 - 5.0Wat 25ÉC (77ÉF)
If NG, replace fuel pump.
SEF111U
SEF168U
SEF511P
SEF155U
.
.
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
Fuel Pump (Cont'd)
EC-156

COMPONENT DESCRIPTION
The idle air adjusting (IAA) unit is made up of the IACV-AAC
valve, IACV-FICD solenoid valve and idle adjusting screw. It
receives the signal from the ECM and controls the idle speed at
the preset value.
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)
11 G/R Air conditioner relayEngine is running.
Both air conditioner switch and blower switch
are ``ON''. (Compressor operates.)Approximately 1V
Engine is running.
Air conditioner switch is ``OFF''.BATTERY VOLTAGE
(11 - 14V)
41 Y Air conditioner switchEngine is running.
Both air conditioner switch and blower switch
are ``ON''. (Compressor operates.)Approximately 0V
Engine is running.
Air conditioner switch is ``OFF''.BATTERY VOLTAGE
(11 - 14V)
SEF158U
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
IACV-FICD Solenoid Valve (Cont'd)
EC-170

DIAGNOSTIC PROCEDURE
INSPECTION START
CHECK OVERALL FUNCTION.
1. Start engine and warm it up suffi-
ciently.
2. Check idle speed.
800 50 rpm
If NG, adjust idle speed.
3. Turn air conditioner switch and blower
fan switch ``ON''.
4. Recheck idle speed.
900 rpm or more
NG
cOK
INSPECTION END
Check if air conditioner compressor func-
tions normally.
OK
cNG
Refer to HA section.
CHECK POWER SUPPLY.
1. Stop engine.
2. Disconnect IACV-FICD solenoid valve
harness connector.
3. Restart engine and turn air conditioner
switch and blower fan switch ``ON''.
4. Check voltage between terminal
V4
and ground with CONSULT or tester.
Voltage: Battery voltage
OK
cNG
Check the following.
lHarness connectors,
E101,M5
lHarness for open or
short between IACV-
FICD solenoid valve and
air conditioner relay
If NG, repair harness or
connectors.
CHECK GROUND CIRCUIT.
1. Turn ignition switch ``OFF''.
2. Check harness continuity between ter-
minal
V2and body ground.
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
(IACV-FICD solenoid valve).
Refer to ``COMPONENT INSPECTION''
on next page.
OK
cNG
Replace IACV-FICD sole-
noid valve.
VA
(Go to next page.)
MEF634E
SEF117U
SEF118U
.
.
.
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
IACV-FICD Solenoid Valve (Cont'd)
EC-171

Description
When coolant temperature is lower than 50ÉC (122ÉF), the relay is turned on at the same time that the igni-
tion switch is turned on. From this time, the electric current flows through the glow plugs and heats them up
quickly. After T
1seconds have passed, the control unit turns off the indicator. The relay automatically turns
off after it has been on for T
2seconds or the cranking time, whichever is longer.
The relay remains on for T
3seconds after the ignition switch has returned to ``ON'' from ``START''. These
features improve the combustion performance of the engine after it has started.
When the coolant temperature is higher than 50ÉC (122ÉF), the relay is turned on only during engine crank-
ing.
T1: approx.2-6[sec.] (Varies with coolant temperature.)
T
2: 30 [sec.] [When coolant temperature is below 50ÉC (122ÉF).]
5 [sec.] [When coolant temperature is over 50ÉC (122ÉF).]
T
3: 600 [sec.] [When coolant temperature is below 50ÉC (122ÉF).]
0 [sec.] [When coolant temperature is over 50ÉC (122ÉF).]
SEF905V
QUICK-GLOW SYSTEMTD
EC-196