Infiniti Q45. Manual — part 791
STARTING SYSTEM
SC-9
C
D
E
F
G
H
I
J
L
M
A
B
SC
STARTING SYSTEM
PFP:00011
System Description
NKS0016N
Power is supplied at all times
●
through 50A fusible link (letter G , located in the fuse, fusible link and relay block)
●
to ignition switch terminal 1.
With the ignition switch in the START position, power is supplied
●
from ignition switch terminal 4
●
to park/neutral position relay terminal 7.
Ground is supplied with the selector lever in the P or N position
●
to A/T assembly terminal 9
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through park/neutral position relay terminals 1 and 2
●
from grounds E24, E42 and E62.
Then park/neutral position switch is energized and power is supplied
●
from park/neutral position relay terminal 6
●
to starter motor harness connector terminal 1.
The starter motor plunger closes and provides a closed circuit between the battery and starter motor. The
starter motor is grounded to the engine block. With power and ground supplied, cranking occurs and the
engine starts.
SC-10
STARTING SYSTEM
Wiring Diagram — START —
NKS0016O
TKWM1455E
STARTING SYSTEM
SC-11
C
D
E
F
G
H
I
J
L
M
A
B
SC
Trouble Diagnosis with Battery/Starting/Charging System Tester
NKS0016P
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 test with Battery/Starting/Charging system
tester. Refer to
SC-6, "Trouble Diagnosis with Battery/Starting/
.
3.
Press “ENTER” to begin the starting system test.
4.
Start the engine.
5.
Diagnostic result is displayed on the tester. Refer to
"DIAGNOSTIC RESULT ITEM CHART"
.
NOTE:
●
If the starter performs normally but the engine does not start,
perform engine diagnosis.
●
For intermittent “NO CRANK” or “NO STARTER OPERA-
TION” incidents, go to DIAGNOSTIC PROCEDURE 2.
DIAGNOSTIC RESULT ITEM CHART
SEL408X
SEL409X
SEL410X
Diagnostic item
Service procedure
CRANKING VOLTAGE NORMAL
Go to
CRANKING VOLTAGE LOW
CHARGE BATTERY
Perform 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
with Battery/Starting/Charging System Tester"
REPLACE BATTERY
Before replacing battery, clean the battery cable clamps and battery posts. Perform battery test
again with Battery/Starting/Charging system tester. Refer to
SC-6, "Trouble Diagnosis with Bat-
tery/Starting/Charging System Tester"
. If second test result is “REPLACE BATTERY”, then do so.
Perform battery test again to confirm repair.
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