Infiniti Q45. Manual — part 793
CHARGING SYSTEM
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Wiring Diagram — CHARGE —
NKS0016U
TKWM1454E
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CHARGING SYSTEM
Trouble Diagnoses with Battery/Starting/Charging System Tester
NKS0016V
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.
Before starting, perform the preliminary inspection. Refer to
SC-21, "PRELIMINARY INSPECTION"
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
CHARGING SYSTEM
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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
"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
LOW CHARGING VOLTAGE
HIGH CHARGING VOLTAGE
DIODE RIPPLE NORMAL
Diode ripple is OK and will also show CHARGING VOLTAGE test result.
EXCESS RIPPLE DETECTED
Replace the alternator. Perform “DIODE RIPPLE” test again using Battery/Starting/Charging
system tester to confirm repair.
DIODE RIPPLE NOT DETECTED
Go to
SC-20
CHARGING SYSTEM
WORK FLOW
*1
SC-22, "Check “L” Terminal Circuit
(Open)"
*2
SC-22, "Check “L” Terminal Circuit
(Short)"
*3
SC-23, "Check “S” Terminal Circuit"
*4
SC-24, "Check “B” Terminal Circuit"
*5
SC-26, "ALTERNATOR PULLEY
INSPECTION"
SKIB0527E
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