Infiniti M45 (Y34). Manual - part 740

STARTING SYSTEM

SC-11

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SC

Trouble Diagnosis with Battery/Starting/Charging System Tester

AKS002EM

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-11,

"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, refer to DIAGNOSTIC PROCEDURE 2.

DIAGNOSTIC RESULT ITEM CHART

SEL408X

SEL409X

SEL410X

Diagnostic item

Service procedure

CRANKING VOLTAGE NORMAL

Go to 

SC-12, "WORK FLOW"

 .

CRANKING VOLTAGE LOW

Go to 

SC-12, "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.

SC-12

STARTING SYSTEM

WORK FLOW

*1

SC-6, "Trouble Diagnosis with Bat-
tery/Starting/Charging System 
Tester"

*2

SC-14, "MINIMUM SPECIFICATION 
OF CRANKING VOLTAGE REFER-
ENCING COOLANT TEMPERA-
TURE"

*3

SC-13, "DIAGNOSTIC PROCE-
DURE 1"

*4

SC-14, "DIAGNOSTIC PROCE-
DURE 2"

SKIB0227E

STARTING SYSTEM

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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)

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.

Turn ignition switch OFF.

2.

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-12, "WORK FLOW"

 .

NG

>> Check the starter motor case and ground for poor conti-

nuity.

Battery voltage should exist.

PKIA2842E

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

PKIA2943E

SC-14

STARTING SYSTEM

DIAGNOSTIC PROCEDURE 2
Check “S” Connector Circuit

1. 

CHECK POWER SUPPLY FOR STARTER MOTOR “S” CONNECTOR

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.

Disconnect starter motor connector.

5.

Check voltage between starter motor harness connector E312
terminal 1 (B/R) and ground using a digital circuit tester.

OK or NG

OK

>> GO TO 2.

NG

>> Check the following.

●

50A fusible link (letter G , located in fuse, fusible link
and relay box)

●

Ignition switch

●

Park/neutral position relay

●

Harness for open or short

2. 

CHECK “S” TERMINAL CONNECTION  QUALITY (VOLTAGE DROP TEST)

1.

Turn ignition switch OFF.

2.

Connect starter motor connector.

3.

Check voltage between starter motor harness connector E312
terminal 1 (B/R) and battery positive terminal using a digital cir-
cuit tester.

OK or NG

OK

>> Starter motor “S” connector circuit is OK. Further inspec-

tion necessary. Refer to 

SC-12, "WORK FLOW"

 .

NG

>> Check harness between the battery and the starter motor “S” connector for poor continuity.

MINIMUM SPECIFICATION OF CRANKING VOLTAGE REFERENCING COOLANT TEMPERA-
TURE

When the ignition switch is in START position,

Battery voltage should exist.

PKIA2807E

When the ignition switch is in START position,

Voltage: Less than 1V

PKIA2808E

Engine coolant temperature

Voltage V

−

30

°

C to 

−

20

°

C (

−

22

°

F to 

−

4

°

F)

8.4

−

19

°

C to 

−

10

°

C (

−

2

°

F to 14

°

F)

8.9

−

9

°

C to 0

°

C (16

°

F to 32

°

F)

9.3

More than 1

°

C (More than 34

°

F)

9.7