Infiniti F50. Manual — part 744
STARTING SYSTEM
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Wiring Diagram — START —
EKS000AC
TKWM0352E
SC-24
STARTING SYSTEM
Trouble Diagnosis with Battery/Starting/Charging System Tester
EKS00149
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.
Diagnosis 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
Go to
.
CHARGE BATTERY
Perform the slow battery charging procedure. (Initial rate of charge is 10A for 12 hours.) Per-
form battery test again with Battery/Starting/Charging system tester. Refer to
Diagnosis 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
with Battery/Starting/Charging System Tester"
. If second test result is “REPLACE BAT-
TERY”, then do so. Perform battery test again to confirm repair.
STARTING SYSTEM
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WORK FLOW
PKIA2371E
SC-26
STARTING SYSTEM
DIAGNOSTIC PROCEDURE 1
Check “B” Terminal Circuit
1.
CHECK POWER SUPPLY FOR STARTER MOTOR “B” 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 switch OFF.
4.
Make sure that the starter motor B terminal E313 terminal 2 (B/R) connection is clean and tight.
5.
Check voltage between starter motor B terminal E313 terminal 2
(B/R) and ground using a digital circuit tester.
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 B terminal E313 terminal 2
(B/R) and battery positive terminal using a digital circuit tester.
OK or NG
OK
>> GO TO 3.
NG
>> Check harness between the battery and the starter
motor for poor continuity.
3.
CHECK STARTER MOTOR GROUND CIRCUIT (VOLTAGE DROP TEST)
1.
Check voltage between starter motor case and battery negative
terminal using a digital circuit tester.
OK or NG
OK
>> Starter motor “B” terminal circuit is OK. Further inspec-
tion necessary. Refer to
NG
>> Check the starter motor case and ground for poor conti-
nuity.
*1
SC-6, "Trouble Diagnosis with Bat-
tery/Starting/Charging System
Tester"
*2
SC-27, "MINIMUM SPECIFICATION
OF CRANKING VOLTAGE REFER-
ENCING COOLANT TEMPERA-
TURE"
*3
SC-26, "DIAGNOSTIC PROCE-
DURE 1"
*4
SC-27, "DIAGNOSTIC PROCE-
DURE 2"
Battery voltage should exist.
PKIA2369E
When the ignition switch is in START position,
Voltage: Less than 0.5V
PKIA2370E
When the ignition switch is in START position,
Voltage: Less than 0.2V
SKIA0399E
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