Infiniti QX4 (R50). Manual — part 543
Construction
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MEL949LB
MEL950L
Removal and Installation
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Pinion/Clutch Check
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1.
Inspect pinion teeth.
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Replace pinion if teeth are worn or damaged. (Also check
condition of ring gear teeth.)
2.
Inspect reduction gear teeth.
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Replace reduction gear if teeth are worn or damaged. (Also
check condition of armature shaft gear teeth.)
3.
Check to see if pinion locks in one direction and rotates
smoothly in the opposite direction.
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If it locks or rotates in both directions, or unusual resistance is
evident, replace.
STARTING SYSTEM
Construction
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System Description
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The alternator provides DC voltage to operate the vehicle’s electrical system and to keep the battery charged.
The voltage output is controlled by the IC regulator.
Power is supplied at all times to alternator terminal S through:
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120A fusible link (letter a, located in the fuse and fusible link box), and
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7.5A fuse (No. 65, located in the fuse and fusible link box).
Terminal B supplies power to charge the battery and operate the vehicle’s electrical system. Output voltage
is controlled by the IC regulator at terminal S detecting the input voltage. The charging circuit is protected by
the 120A fusible link.
Terminal E of the alternator supplies ground through body ground E101.
With the ignition switch in the ON or START position, power is supplied
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through 10A fuse [No. 8, located in the fuse block (J/B)]
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to combination meter terminal 12 for the charge warning lamp.
Ground is supplied to terminal 43 of the combination meter through terminal L of the alternator. With power
and ground supplied, the charge warning lamp will illuminate. When the alternator is providing sufficient volt-
age with the engine running, the ground is opened and the charge warning lamp will go off.
If the charge warning lamp illuminates with the engine running, a fault is indicated.
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CHARGING SYSTEM
System Description
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Wiring Diagram — CHARGE —
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MEL653L
CHARGING SYSTEM
Wiring Diagram — CHARGE —
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Trouble Diagnoses with
Battery/Starting/Charging System Tester
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NOTE:
To ensure a complete and thorough diagnosis, the battery, starter
and alternator test segments must be done as a set from start to
finish.
SEL417X
1.
Turn off all loads on the vehicle electrical system.
2.
Perform battery and starting system test with Battery/Starting/
Charging system tester.
3.
Press “ENTER” to begin the charging system test.
4.
Start engine.
SEL418X
5.
Press “ENTER” until “LOADS OFF REV ENGINE 5 SEC” is
displayed.
6.
Raise and hold the engine speed at 1,500 to 2,000 rpm for
about 5 seconds, then return to the engine to idle.
Once the increase in engine rpm is detected, press “ENTER”
to continue.
NOTE:
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If after 30 seconds an increase in engine idle speed is not
detected, “RPM NOT DETECTED” will display.
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Some engines may have a higher idle initially after starting,
particularly when the engine is cold. The tester may detect this
without any other action being taken. If this occurs, continue on
with the testing process. The final results will not be affected.
SEL419X
7.
The tester now checks the engine at idle and performs the
DIODE/RIPPLE check.
8.
When complete, the tester will prompt you to turn on the fol-
lowing electrical loads.
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Heater fun set to highest. Do not run the A/C or windshield
defroster.
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Headlamp high beam
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Rear window defogger
NOTE:
Do not run the windshield wipers or any other cyclical loads.
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CHARGING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester
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