2004 INFINITI QX56 battery

CHARGING SYSTEM
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Revision: August 20072004 QX56
Trouble Diagnoses with Battery/Starting/Charging System TesterEKS0079G
NOTE:
To ensure a complete and thorough diagnosis, the battery, starter and generator test segments must be done
as a set from start to finish.
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.
5. Press “ENTER” until “LOADS OFF REV ENGINE 5 SEC” is dis-
played.
6. 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 “ENTER” to
continue.
NOTE:

If after 30 seconds an increase in engine idle speed is not
detected, “RPM NOT DETECTED” will display.

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, con-
tinue on with the testing process. The final results will not be affected.
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 follow-
ing electrical loads.

Heater fan set to highest speed. Do not run the A/C or wind-
shield defroster.

Headlamp high beam

Rear window defogger
NOTE:
Do not run the windshield wipers or any other cyclical loads.
9. Press “ENTER” to continue.
SEL417X
SEL418X
SEL419X
SEL420X

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CHARGING SYSTEM
Revision: August 20072004 QX56
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 “ENTER” to continue.
NOTE:
If after 30 seconds an increase in engine idle speed is not
detected, “RPM NOT DETECTED” will be displayed. Press
“ENTER” to restart the test.
11. Diagnostic result is displayed on the tester. Refer to SC-20,
"DIAGNOSTIC RESULT ITEM CHART" .
12. Press “ENTER” then test output code is displayed. Record the
test output code on the repair order.
13. Toggle back to the “DIAGNOSTIC SCREEN” for test results.
DIAGNOSTIC RESULT ITEM CHART
SEL421X
SEL422X
SEL577X
Diagnostic item Service procedure
CHARGING SYSTEM NORMAL Charging system is normal and will also show DIODE RIPPLE test result.
NO CHARGING VOLTAGE Go to SC-21, "
WORK FLOW" .
LOW CHARGING VOLTAGE Go to SC-21, "
WORK FLOW" .
HIGH CHARGING VOLTAGE Go to SC-21, "
WORK FLOW" .
DIODE RIPPLE NORMAL Diode ripple is OK and will also show CHARGING VOLTAGE test result.
EXCESS RIPPLE DETECTEDReplace the generator. Perform “DIODE RIPPLE” test again using Battery/Starting/Charging
system tester to confirm repair.
DIODE RIPPLE NOT DETECTED Go to SC-21, "
WORK FLOW" .

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CHARGING SYSTEM
Revision: August 20072004 QX56
DIAGNOSTIC PROCEDURE 1
Check Terminal "3" Circuit
1. CHECK “3” TERMINAL CONNECTION
1. Turn the ignition switch OFF.
2. Check to see if “3” terminal is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair “3” terminal connection. Confirm repair by performing complete Battery/Starting/Charging
system test.
2. CHECK “3” TERMINAL CIRCUIT
1. Disconnect E205 connector from generator.
2. Apply ground to connector E205 terminal 3 (BR/W) with the igni-
tion switch in the ON position.
OK or NG
OK >> GO TO SC-21, "WORK FLOW" .
NG >> Check the following.

10A fuse [No. 14, located in fuse block (J/B)]

CHARGE lamp

Harness for open or short between combination
meter and fuse

Harness for open or short between combination meter and generator CHARGE lamp should light up.
WKIA2110E

CHARGING SYSTEM
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Revision: August 20072004 QX56
DIAGNOSTIC PROCEDURE 2
Check Terminal "1" Circuit
1. CHECK “1” TERMINAL CONNECTION
1. Turn the ignition switch OFF.
2. Check to see if “1” terminal is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair “1” terminal connection. Confirm repair by performing complete Battery/Starting/Charging
system test.
2. CHECK GENERATOR “1” TERMINAL CIRCUIT
Check voltage between generator connector E206 terminal 1 (B/R)
and ground using a digital circuit tester.
OK or NG
OK >> GO TO 3.
NG >> Check the following.

140A fusible link (letter a , located in fusible link box)

Harness for open or short between generator and fus-
ible link
3. CHECK “1” TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)
Check voltage between generator connector E206 terminal 1 (B/R)
and battery positive terminal using a digital circuit tester.
OK or NG
OK >> Replace the generator. Refer to SC-27, "Removal and
Installation" . Confirm repair by performing complete
Battery/Starting/Charging system test.
NG >> Check harness between the battery and the generator
for poor continuity.
DIAGNOSTIC PROCEDURE 3
Check Terminal "3" Circuit
1. CHECK “3” TERMINAL CONNECTION
1. Turn the ignition switch OFF.
2. Check to see if “3” terminal is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair “3” terminal connection. Confirm repair by performing complete Battery/Starting/Charging
system test. Battery voltage should exist.
W K I A 2111 E
With engine running
at idle and warm.: Less than 0.2V
WKIA2112E

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CHARGING SYSTEM
Revision: August 20072004 QX56
2. CHECK “3” TERMINAL CIRCUIT
1. Disconnect E205 connector from generator.
2. Apply ground to connector E205 terminal 3 (BR/W) with the igni-
tion switch in the ON position.
OK or NG
OK >> Replace the generator. Refer to SC-27, "Removal and
Installation" . Confirm repair by performing complete
battery/starting/charging system test.
NG >> Check the following.

10A fuse [No. 14, located in fuse block (J/B)]

CHARGE lamp

Harness for open or short between combination meter and fuse

Harness for open or short between combination meter and generator CHARGE lamp should light up.
WKIA2110E

CHARGING SYSTEM
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Revision: August 20072004 QX56
DIAGNOSTIC PROCEDURE 4
Check Terminal "1" Circuit
1. CHECK “1” TERMINAL CONNECTION
1. Turn the ignition switch OFF.
2. Check to see if “1” terminal is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair “1” terminal connection. Confirm repair by performing complete Battery/Starting/Charging
system test.
2. CHECK GENERATOR “1” TERMINAL CIRCUIT
Check voltage between generator connector E206 terminal 1 (B/R)
and ground using a digital circuit tester.
OK or NG
OK >> GO TO 3.
NG >> Check the following.

140A fusible link (letter a , located in fusible link box)

Harness for open or short between generator and fus-
ible link
3. CHECK “1” TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)
1. Start the engine.
2. Check voltage between generator connector E206 terminal 1 (B/
R) and battery positive terminal using a digital circuit tester.
OK or NG
OK >> GO TO 4.
NG >> Check harness between the battery and the generator
for poor continuity.
4. CHECK GENERATOR DRIVE BELT TENSION
1. Turn the ignition switch OFF.
2. Check generator drive belt tension. Refer to EM-12, "
DRIVE BELTS" .
OK or NG
OK >> Replace the generator. Refer to SC-27, "Removal and Installation" . Confirm repair by performing
complete battery/starting/charging system test.
NG >> Readjust drive belt tension. Refer to EM-12, "
Tension Adjustment" . Battery voltage should exist.
W K I A 2111 E
With engine running
at idle and warm.: Less than 0.2V
WKIA2112E

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CHARGING SYSTEM
Revision: August 20072004 QX56
DIAGNOSTIC PROCEDURE 5
Check Terminal "4" Circuit
1. CHECK “4” TERMINAL CONNECTION
1. Turn the ignition switch OFF.
2. Check to see if “4” terminal is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair “4” terminal connection. Confirm repair by performing complete Battery/Starting/Charging
system test.
2. CHECK GENERATOR “4” TERMINAL CIRCUIT
Check voltage between generator connector E205 terminal 4 (Y/B)
and ground using a digital circuit tester.
OK or NG
OK >> GO TO 3.
NG >> Check the following.

10A fuse (No. 30, located in fuse and fusible link box)

Harness for open or short between generator and
fuse
3. CHECK “4” TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)
1. Start the engine.
2. Check voltage between generator connector E205 terminal 4 (Y/
B) and battery positive terminal using a digital circuit tester.
OK or NG
OK >> Replace the generator. Refer to SC-27, "Removal and
Installation" . Confirm repair by performing complete
Battery/Starting/Charging system test.
NG >> Check harness between the battery and the generator
for poor continuity. Battery voltage should exist.
WKIA2113E
With engine running
at idle and warm.: Less than 0.2V
WKIA2114E

CHARGING SYSTEM
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Revision: August 20072004 QX56
MALFUNCTION INDICATOR
The IC regulator warning function activates to illuminate “CHARGE” warning lamp, if any of the following
symptoms occur while generator is operating:

Excessive voltage is produced.

No voltage is produced.
Removal and InstallationEKS0079H
REMOVAL
1. Disconnect the negative battery terminal.
2. Remove the fan shroud. Refer to CO-10, "
Removal and Installation" .
3. Remove the drive belt. Refer to EM-12, "
Removal and Installation" .
4. Remove the lower bracket, using power tools.
5. Remove the generator upper bolt, using power tools.
6. Disconnect the generator harness connectors.
7. Remove the generator.
INSTALLATION
Installation is in the reverse order of removal.

Install the generator and check the tension of the drive belt. Refer to EM-12, "Tension Adjustment" .
CAUTION:
Tighten terminal "1" nut carefully.
WKIA1390E
Terminal "1" nut : 10.8 N·m (1.1 kg-m, 8 ft-lb)