Infiniti F50. Manual - part 744

 

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Infiniti F50. Manual - part 744

 

 

STARTING SYSTEM

SC-23

C

D

E

F

G

H

I

J

L

M

A

B

SC

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/

Charging System Tester"

 .

3.

Press “ENTER” to begin the starting system test.

4.

Start the engine.

5.

Diagnosis result is displayed on the tester. Refer to 

SC-24,

"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 

SC-25, "WORK FLOW"

 .

CRANKING VOLTAGE LOW

Go to 

SC-25, "WORK FLOW"

 .

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 

SC-6, "Trouble 

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 

SC-6, "Trouble Diagnosis 

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

SC-25

C

D

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F

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B

SC

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 

SC-25, "WORK FLOW"

 .

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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