1998 NISSAN PICK-UP Repair Manual

Wiring Diagram Ð CHARGE Ð/Diesel Engine
HEL319A
CHARGING SYSTEM
EL-35

Trouble Diagnoses
Before conducting an alternator test, make sure that the battery is fully charged. A 30-volt voltmeter and
suitable test probes are necessary for the test. The alternator can be checked easily by referring to the
Inspection Table.
lBefore starting, inspect the fusible link.
lUse fully charged battery.
GASOLINE ENGINE MODELS
Check the fol-
lowing:
lWarning
lamp bulb
lFuse for
warning lamp
Ignition switch
``ON''Warning lamp
``OFF''Disconnect connector (S, L) and
ground L harness side.Warning lamp
``OFF''
Warning lamp
``ON''Damaged IC
regulator.
Replace.
Warning lamp
``ON''
Engine start.
Engine speed:
1,500 rpmWarning lamp
``ON''Check the following:lDrive beltlFuse for S terminallConnector (S, L terminal) con-
nection
Engine idlingWarning lamp
``OFF''OK
Warning lamp
``ON''
Warning lamp
``OFF''OKEngine speed:
1,500 rpm
(Measure B
terminal volt-
age)More than
15.5VDamaged IC
regulator.
Replace.
No generationField circuit is
open.
Warning lamp: ``CHARGE'' warning lamp in combination meter
Note:
lIf the inspection result is OK even though the charging system is malfunctioning, check the B
terminal connection. (Check the tightening torque.)
lWhen field circuit is open, check condition of rotor coil, rotor slip ring and brush. If necessary,
replace faulty parts with new ones.
Malfunction indicator
The IC regulator warning function activates to illuminate ``CHARGE'' warning lamp, if any of the following
symptoms occur while alternator is operating:
lField circuit is open.
lExcessive voltage is produced.
CHARGING SYSTEM
EL-36

DIESEL ENGINE MODELS
Check the fol-
lowing:
lWarning
lamp bulb
lFuse for
warning lamp
Ignition switch
``ON''Warning lamp
``OFF''Disconnect connector (S, L) and
ground L harness side.Warning lamp
``OFF''
Warning lamp
``ON''Damaged IC
regulator.
Replace.
Warning lamp
``ON''
Engine idlingWarning lamp
``ON''Check the fol-
lowing:
lDrive beltlField circuit
Check the fol-
lowing:
lFuse for S
terminal
lOpen circuit
for S terminal
lIC regulator
Warning lamp
``OFF''Engine speed: 1,500 rpm
(Measure B terminal voltage)More than
15.5V
13 - 15VOK
Warning lamp: ``CHARGE'' warning lamp in combination meter
Note:
lIf the inspection result is OK even though the charging system is malfunctioning, check the B
terminal connection (check the tightening torque).
lWhen field circuit is open, check condition of rotor coil, rotor slip ring and brush. If necessary,
replace faulty parts with new ones.
CHARGING SYSTEM
Trouble Diagnoses (Cont'd)
EL-37

Construction
MEL383I
MEL443HA
CHARGING SYSTEM
EL-38

Removal and Installation
CAUTION:
lStart service operation after removing the negative ter-
minal from the battery.
lAlso remove the undercover, if equipped, before servic-
ing.
Disassembly
REAR COVER
CAUTION:
Rear cover may be hard to remove because a ring is used
to lock outer race of rear bearing. To facilitate removal of
rear cover, heat just bearing box section with a 200W sol-
dering iron.
Do not use a heat gun, as it can damage diode assembly.
REAR BEARING
CAUTION:
lDo not reuse rear bearing after removal. Replace with a
new one.
lDo not lubricate rear bearing outer race.
Inspection
ROTOR CHECK
1. Resistance test
Resistance: Refer to SDS, EL-41.
lNot within the specified values ... Replace rotor.
2. Insulator test
lContinuity exists. ... Replace rotor.
3. Check slip ring for wear.
Slip ring minimum outer diameter:
Refer to SDS, EL-41.
lNot within the specified values ... Replace rotor.
MEL445H
.
SEL032Z
SEL033Z
CHARGING SYSTEM
EL-39

BRUSH CHECK
1. Check smooth movement of brush.
lNot smooth ... Check brush holder and clean.
2. Check brush for wear.
lReplace brush if it is worn down to the limit line.
STATOR CHECK
1. Continuity test
lNo continuity ... Replace stator.
2. Ground test
lContinuity exists. ... Replace stator.
Assembly
RING FITTING IN REAR BEARING
lFix ring into groove in rear bearing so that it is as close to
the adjacent area as possible.
CAUTION:
Do not reuse rear bearing after removal.
REAR COVER INSTALLATION
1. Fit brush assembly, diode assembly, regulator assembly and
stator.
2. Push brushes up with fingers and install them to rotor.
Take care not to damage slip ring sliding surface.
SEL631DA
SEL108E
SEL109E
SEL044Z
SEL048Z
CHARGING SYSTEM
Inspection (Cont'd)
EL-40

Service Data and Specifications (SDS)
ALTERNATOR
TypeLR160-727C LR160-728C
HITACHI
Applied model KA24 TD25
Nominal rating V-A 12-60
Ground polarityNegative
Minimum revolution under no-load
(When 13.5V is applied) rpmLess than 1,000
Hot output current A/rpmMore than 17/1,300
More than 48/2,500
More than 57/5,000
(When 13.5V is applied)
Regulated output voltage V 14.1 - 14.7
Minimum length of brush
mm (in)6.0 (0.236)
Brush spring pressure
N (g, oz)1.0 - 3.4 (102 - 350, 3.60 - 12.34)
Slip ring minimum outer diameter
mm (in)26.0 (1.024)
Rotor (Field coil) resistanceW2.58
SEL049Z
CHARGING SYSTEM
Assembly (Cont'd)
EL-41

Check
FOR EUROPE AND LHD MODELS
HEL320A
COMBINATION SWITCH
EL-42