1998 NISSAN PICK-UP Repair Manual

FOR EUROPE
HEC566
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
IACV-FICD Solenoid Valve (Cont'd)
EC-169

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

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. Then retest.
INSPECTION END
COMPONENT INSPECTION
IACV-FICD solenoid valve
Disconnect IACV-FICD solenoid valve harness connector.
lCheck for clicking sound when applying 12V direct current to
terminals.
lCheck plunger for seizing or sticking.
lCheck for broken spring.
SEF159U
SEF199S
.
.
.
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
IACV-FICD Solenoid Valve (Cont'd)
EC-172

MIL & Data Link Connectors
LHD MODELS EXCEPT FOR EUROPE
HEC362
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
EC-173

RHD MODELS
HEC363
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
MIL & Data Link Connectors (Cont'd)
EC-174

FOR EUROPE
HEC567
TROUBLE DIAGNOSIS FOR NON-DETECTABLE ITEMSKA
MIL & Data Link Connectors (Cont'd)
EC-175

CAUTION:
lDisassembly and assembly of the injection pumps should be done only in service shops autho-
rized by NISSAN or by the pump manufacturer.
lThe pump tester is required for servicing the pump.
lBefore removing fuel injection pump from vehicle, check closely to make sure that it is definitely
malfunctioning.
For TD25 engine models with Nissan Anti-Theft System (NATS)
lFor inspection of coded solenoid unit (CSOLU), refer to NATS (Diesel) in EL section.
lWhen replacing injection pump assembly along with CSOLU, perform NATS initialisation with
CONSULT.
For initialisation procedure, refer to NATS (Diesel) in EL section.
Fuel System
SEF378RA
INJECTION SYSTEMTD
EC-176