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CHARGING SYSTEM
Revision: 2004 November 2004 FX35/FX45
Wiring Diagram — CHARGE —AKS0079J
VK45DE ENGINE MODELS
TKWM0550E
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VQ35DE ENGINE MODELS
TKWM0551E
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SC-26
CHARGING SYSTEM
Revision: 2004 November 2004 FX35/FX45
Trouble Diagnosis with Battery/Starting/Charging System TesterAKS0079K
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.
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
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Revision: 2004 November 2004 FX35/FX45
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-27,
"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-28, "
WORK FLOW" .
LOW CHARGING VOLTAGE Go to SC-28, "
WORK FLOW" .
HIGH CHARGING VOLTAGE Go to SC-28, "
WORK FLOW" .
DIODE RIPPLE NORMAL Diode ripple is OK and will also show CHARGING VOLTAGE test result.
EXCESS RIPPLE DETECTEDReplace the alternator. Perform “DIODE RIPPLE” test again using Battery/Starting/Charging
system tester to confirm repair.
DIODE RIPPLE NOT DETECTED Go to SC-28, "
WORK FLOW" .
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CHARGING SYSTEM
Revision: 2004 November 2004 FX35/FX45
WORK FLOW
PKIA2226E
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DIAGNOSTIC PROCEDURE 1
Check “L” Terminal Circuit
1. CHECK “L” TERMINAL CONNECTION
1. Turn ignition switch OFF.
2. Check to see if “L” terminal is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair “L” terminal connection. Confirm repair by performing complete Battery/Starting/Charging
system test.
2. CHECK “L” TERMINAL CIRCUIT
1. Disconnect alternator connector.
2. Apply ground to alternator harness connector E311
*1 or F26*2
terminal 3 (OR) with the ignition switch in the ON position.
NOTE:
*1: VK45DE, *2: VQ35DE
OK or NG
OK >> Go to SC-28, "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 alternator CHARGE lamp should light up.
PKIA2815E
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Revision: 2004 November 2004 FX35/FX45
DIAGNOSTIC PROCEDURE 2
Check “B” Terminal Circuit
1. CHECK “B” TERMINAL CONNECTION
1. Turn ignition switch OFF.
2. Check to see if “B” terminal is clean and tight.
OK or NG
OK >> GO TO 2. Confirm repair by performing complete Battery/Starting/Charging system test.
NG >> Repair “B” terminal connection.
2. CHECK ALTERNATOR “B” TERMINAL CIRCUIT
Check voltage between alternator B terminal E307 terminal 1 (B/R)
and ground using a digital circuit tester.
OK or NG
OK >> GO TO 3.
NG >> Check the following.
120A fusible link [fusible link holder (VK45DE and
VQ35DE AWD)]
Harness for open or short between alternator and fus-
ible link (VK45DE and VQ35DE AWD)
Harness for open or short between alternator and battery (VQ35DE 2WD)
3. CHECK “B” TERMINAL CONNECTION (VOLTAGE DROP TEST)
1. Start the engine.
2. When the engine running at idle and warm, check voltage
between alternator B terminal E307 terminal 1 (B/R) and battery
positive terminal using a digital circuit tester.
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. Battery voltage should exist.
PKIA2944E
Voltage: Less than 0.2V
PKIA2366E
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DIAGNOSTIC PROCEDURE 3
Check “L” Terminal Circuit
1. CHECK “L” TERMINAL CONNECTION
1. Turn ignition switch OFF.
2. Check to see if “L” terminal is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair “L” terminal connection. Confirm repair by performing complete Battery/Starting/Charging
system test.
2. CHECK “L” TERMINAL CIRCUIT
1. Disconnect alternator connector.
2. Apply ground to alternator harness connector E311
*1 or F26*2
terminal 3 (OR) with the ignition switch in the ON position.
NOTE:
*1: VK45DE, *2: VQ35DE
OK or NG
OK >> Replace the alternator. 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 alternator CHARGE lamp should light up.
PKIA2815E