INFINITI QX4 2001 Factory Service Manual

Wiring Diagram Ð CHARGE ÐNBSC0010
MEL653L
CHARGING SYSTEM
Wiring Diagram Ð CHARGE Ð
SC-20

Trouble Diagnoses with
Battery/Starting/Charging System Tester
NBSC0020NOTE:
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 ªENTERº to begin the charging system test.
4. Start engine.
SEL418X
5. Press ªENTERº until ªLOADS OFF REV ENGINE 5 SECº 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 ªENTERº
to continue.
NOTE:
IIf after 30 seconds an increase in engine idle speed is not
detected, ªRPM NOT DETECTEDº will display.
ISome 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.
IHeater fun set to highest. Do not run the A/C or windshield
defroster.
IHeadlamp high beam
IRear 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
SC-21

SEL420X
9. Press ªENTERº to continue.
SEL421X
10. Raise and hold the engine speed at 1,500 to 2,000 rpm for
about 5 seconds, then return the engine to idle. Once the
increase in engine rpm is detected, press ªENTERº to con-
tinue.
NOTE:
If after 30 seconds an increase in engine idle speed is not detected,
ªRPM NOT DETECTEDº will be displayed. Press ªENTERº to
restart the test.
SEL422X
11. Diagnostic result is displayed on the tester. Refer to ªDIAG-
NOSTIC RESULT ITEM CHARTº, SC-23.
SEL577X
12. Press ªENTERº then test output code is displayed. Record the
test output code on the repair order.
13. Toggle back to the ªDIAGNOSTIC SCREENº for test results.
CHARGING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont'd)
SC-22

DIAGNOSTIC RESULT ITEM CHARTNBSC0020S01
Diagnostic item Service procedure
CHARGING SYSTEM NORMAL Charging system is normal and will also show DIODE RIPPLE test result.
NO CHARGING VOLTAGE Go to ªWORK FLOWº, SC-24.
LOW CHARGING VOLTAGE Go to ªWORK FLOWº, SC-24.
HIGH CHARGING VOLTAGE Go to ªWORK FLOWº, SC-24.
DIODE RIPPLE NORMAL Diode ripple is OK and will also show CHARGING VOLTAGE test result.
EXCESS RIPPLE DETECTEDReplace the alternator. Perform ªDIODE RIPPLEº test again using Battery/Starting/
Charging system tester to confirm repair.
DIODE RIPPLE NOT DETECTED Go to ªWORK FLOWº, SC-24.GI
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CHARGING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont'd)
SC-23

WORK FLOWNBSC0020S02
SEL423X
CHARGING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont'd)
SC-24

DIAGNOSTIC PROCEDURE 1NBSC0020S03Check ªLº Terminal CircuitNBSC0020S0301
1 CHECK ªLº TERMINAL CONNECTION
Check to see if ªLº terminal is clean and tight.
OK or NG
OK©GO TO 2.
NG©Repair ªLº terminal connection. Confirm repair by performing complete Battery/Starting/
Charging system test.
2 CHECK ªLº TERMINAL CIRCUIT
1. Disconnect E106 connector from alternator.
2. Apply ground to E106 connector terminal 1 with the ignition switch in the ON position.
SEL424X
OK or NG
OK©Replace the alternator. Confirm repair by performing complete Battery/Starting/Charging
system test.
NG©Check the following.
I10A fuse [No. 8, located in fuse block (J/B)]
ICHARGE lamp
IHarness for open or short between combination meter and fuse
IHarness for open or short between combination meter and alternator
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CHARGING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont'd)
SC-25

DIAGNOSTIC PROCEDURE 2=NBSC0020S04Check ªBº Terminal CircuitNBSC0020S0401
1 CHECK ªBº TERMINAL CONNECTION
Check to see if ªBº terminal is clean and tight.
OK or NG
OK©GO TO 2. Confirm repair by performing complete Battery/Starting/Charging system test.
NG©Repair ªBº terminal connection.
2 CHECK ALTERNATOR ªBº TERMINAL CIRCUIT
Check voltage between alternator terminal B and ground using a digital circuit tester.
SEL425X
OK or NG
OK©GO TO 3.
NG©Check the following.
I120A fusible link (lettera, located in fuse and fusible link box)
IHarness for open or short between alternator and fusible link
3 CHECK ªBº TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)
Check voltage between alternator terminal B and battery positive terminal using a digital tester.
SEL426X
OK or NG
OK©Replace the alternator. Confirm repair by performing complete Battery/Starting/Charging
system test.
NG©Check harness between the battery and the alternator for poor continuity.
CHARGING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont'd)
SC-26

DIAGNOSTIC PROCEDURE 3=NBSC0020S05Check ªSº Terminal CircuitNBSC0020S0501
1 CHECK ªSº TERMINAL CONNECTION
Check to see if ªSº terminal is clean and tight.
OK or NG
OK©GO TO 2.
NG©Repair ªSº terminal connection. Confirm repair by performing complete Battery/Starting/
Charging system test.
2 CHECK ALTERNATOR ªSº TERMINAL CIRCUIT
Check voltage between alternator terminal 2 and ground using a digital circuit tester.
SEL427X
OK or NG
OK©GO TO 3.
NG©Check the following.
I7.5A fuse (No. 65, located in fuse and fusible link box)
IHarness for open or short between alternator and fuse
3 CHECK ªSº TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)
Check voltage between alternator terminal 2 and battery positive terminal using a digital tester.
SEL428X
OK or NG
OK©Replace the alternator. Confirm repair by performing complete Battery/Starting/Charging
system test.
NG©Check harness between the battery and the alternator for poor continuity.
MALFUNCTION INDICATORNBSC0020S06The IC regulator warning function activates to illuminate
ªCHARGEº warning lamp, if any of the following symptoms occur
while alternator is operating:
IExcessive voltage is produced.
INo voltage is produced.
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CHARGING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont'd)
SC-27

ConstructionNBSC0012
MEL951LA
MEL952LA
Removal and InstallationNBSC0013
CHARGING SYSTEM
Construction
SC-28

BatteryNBSC0014
Applied area USA Canada
Type80D26R
Capacity V-AH12-65
Cold cranking current A
(For reference value)582
StarterNBSC0015
TypeM0T50371
MITSUBISHI make
Reduction gear type
System voltage12V
No-loadTerminal voltage 11.0V
Current Less than 90A
Revolution More than 2,700 rpm
Minimum diameter of commutator28.8 mm (1.134 in)
Minimum length of brush7.0 mm (0.276 in)
Brush spring tension18.3 - 24.8 N (1.87 - 2.53 kg, 4.11 - 5.58 lb)
Movement ªº in height of pinion assembly 0.5 - 2.0 mm (0.020 - 0.079 in)
AlternatorNBSC0016
TypeLR1110-712
HITACHI make
Nominal rating12V-110A
Ground polarityNegative
Minimum revolution under no-load (When 13.5 volts is applied) Less than 1,000 rpm
Hot output current (When 13.5 volts is applied)More than 35A/1,300 rpm
More than 85A/2,500 rpm
More than 110A/5,000 rpm
Regulated output voltage14.1 - 14.7V
Minimum length of brushMore than 6.0 mm (0.236 in)
Brush spring pressure 1.0 - 3.43 N (102 - 350 g, 3.60 - 12.34 oz)
Slip ring minimum outer diameter More than 26.0 mm (1.024 in)
Rotor (Field coil) resistance2.31W
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SERVICE DATA AND SPECIFICATIONS (SDS)
Battery
SC-29