2001 INFINITI QX4 IDX

DIAGNOSTIC RESULT ITEM CHARTNBSC0019S01
Diagnostic item Service procedure
CRANKING VOLTAGE NORMAL Go to ªWORK FLOWº, SC-14.
CRANKING VOLTAGE LOW Go to ªWORK FLOWº, SC-14.
CHARGE BATTERYPerform the slow battery charging procedure. (Initial rate of charge is 10A for 12 hours.)
Perform battery test again with Battery/Starting/Charging system tester. Refer to SC-7.
REPLACE BATTERYBefore replacing battery, clean the battery cable clamps and battery posts. Perform bat-
tery test again with Battery/Starting/Charging system tester. Refer to SC-7. If second test
result is ªREPLACE BATTERYº, then do so. Perform battery test again to confirm repair.GI
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STARTING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont'd)
SC-13

DIAGNOSTIC PROCEDURE 1NBSC0019S03Check ªBº Terminal CircuitNBSC0019S0301
1 CHECK POWER SUPPLY FOR STARTER MOTOR ªBº TERMINAL
1. Remove the fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is released.
3. Turn the ignition OFF.
4. Check that the starter motor terminal 1 connection is clean and tight.
5. Check voltage between starter motor terminal 1 and ground using a digital circuit tester.
SEL412X
OK or NG
OK©GO TO 2.
NG©Check harness between the battery and the starter motor for open circuit.
2 CHECK BATTERY CABLE CONNECTION QUALITY (VOLTAGE DROP TEST)
1. Check voltage between starter motor terminal 1 and battery positive terminal using a digital circuit tester.
SEL413X
OK or NG
OK©GO TO 3.
NG©Check harness between the battery and the starter motor for poor continuity.
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STARTING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont'd)
SC-15

DIAGNOSTIC PROCEDURE 2=NBSC0019S04Check ªSº Terminal CircuitNBSC0019S0401
1 CHECK POWER SUPPLY FOR STARTER MOTOR ªSº TERMINAL
1. Remove the fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is released.
3. Turn the ignition OFF.
4. Disconnect starter motor terminal 2 connector.
5. Check voltage between starter motor terminal 2 and ground using a digital circuit tester.
SEL415X
OK or NG
OK©GO TO 2.
NG©Check the following.
I40A fusible link (lettere, located in fuse and fusible link box)
IPark/neutral position relay
IHarness for open or short
2 CHECK ªSº TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)
1. Connect starter motor terminal 2 connector.
2. Check voltage between starter motor terminal 2 and battery positive terminal using a digital tester.
SEL416X
OK or NG
OK©Starter motor ªSº terminal circuit is OK. Further inspection necessary. Refer to ªWORK
FLOWº, SC-14.
NG©Check harness between the battery and the starter motor ªSº terminal for poor continuity.
MINIMUM SPECIFICATION OF CRANKING VOLTAGE
REFERENCING COOLANT TEMPERATURE
NBSC0019S05
Engine coolant temperature Voltage V
þ30ÉC to þ20ÉC (þ22ÉF to þ4ÉF) 8.6
þ19ÉC to þ10ÉC (þ2ÉF to 14ÉF) 9.1
þ9ÉC to 0ÉC (16ÉF to 32ÉF) 9.5
More than 1ÉC (More than 34ÉF) 9.9
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STARTING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester (Cont'd)
SC-17

System DescriptionNBSC0009The 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:
I120A fusible link (lettera, located in the fuse and fusible link box), and
I7.5A 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
Ithrough 10A fuse [No. 8, located in the fuse block (J/B)]
Ito 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.GI
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CHARGING SYSTEM
System Description
SC-19

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

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

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 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)
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