Infiniti M35/M45 Y50. Manual - part 1044

STARTING SYSTEM

SC-11

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B

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Trouble Diagnosis with Starting/Charging System Tester (Starting)

NKS005BT

For starting system testing, use Starting/Charging System Tester (J-44373). For details and operating instruc-
tions, refer to Technical Service Bulletin.

SKIB1369E

SC-12

STARTING SYSTEM

DIAGNOSTIC PROCEDURE 1
Check “B” Terminal Circuit

CAUTION:

Perform diagnosis under the condition that engine cannot start by the following procedure.

1.

Remove fuel pump fuse.

2.

Crank or start the engine (where possible) until the fuel pressure is released.

1. 

CHECK “B” TERMINAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Make sure that starter motor “B” terminal connection is clean
and tight.

3.

Check voltage between starter motor “B” terminal and ground.

OK or NG

OK

>> GO TO 2.

NG

>> Check harness between battery and starter motor for open circuit.

2. 

CHECK BATTERY CABLE CONNECTION STATUS (VOLTAGE DROP TEST)

Check voltage between starter motor “B” terminal and battery posi-
tive terminal.

OK or NG

OK

>> GO TO 3.

NG

>> Check harness between the battery and the starter motor for poor continuity.

*1

For battery testing, use Battery Ser-
vice Center (J-48087). For details 
and operating instructions, refer to 
Technical Service Bulletin and/or 
Battery Service Center User Guide.

*2

SC-13, "MINIMUM SPECIFICATION 
OF CRANKING VOLTAGE REFER-
ENCING COOLANT TEMPERA-
TURE"

*3

SC-12, "Check “B” Terminal Circuit"

*4

SC-13, "Check “S” Connector Cir-
cuit"

Terminals

Voltage (Approx.)

(+)

(–)

Starter motor

“B” terminal

Terminal

E203

2 Ground

Battery 

voltage

PKIB8793E

Terminals

Condition

Voltage 

(Approx.)

(+)

(–)

Starter motor

“B” terminal

Terminal

Battery positive 

terminal

E203

2 

When the ignition 

switch is in 

START position

Less than

 0.5 V

PKIB8794E

STARTING SYSTEM

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3. 

CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)

1.

Turn ignition switch OFF.

2.

Check voltage between starter motor case and battery negative
terminal.

OK or NG

OK

>> “B” terminal circuit is OK. Further inspection necessary.

Refer to 

SC-11, "Trouble Diagnosis with Starting/Charging System Tester (Starting)"

 .

NG

>> Check the starter motor case and ground for poor continuity.

DIAGNOSTIC PROCEDURE 2
Check “S” Connector Circuit

CAUTION:

Perform diagnosis under the condition that engine cannot start by the following procedure.

1.

Remove fuel pump fuse.

2.

Crank or start the engine (where possible) until the fuel pressure is released.

1. 

CHECK “S” CONNECTOR CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect starter motor connector.

3.

Check voltage between starter motor harness connector and
ground.

OK or NG

OK

>> “S” connector circuit is OK. Further inspection necessary. Refer to 

SC-11, "Trouble Diagnosis with

Starting/Charging System Tester (Starting)"

 .

NG

>> Check the following.

●

Ignition switch and PDU

●

IPDM E/R

●

Harness between starter motor and IPDM E/R

MINIMUM SPECIFICATION OF CRANKING VOLTAGE REFERENCING COOLANT TEMPERA-
TURE

Terminals

Condition

Voltage (Approx.)

(+)

(–)

Starter motor 

case

Battery negative 

terminal

When the ignition 

switch is in

START position

Less than 0.2 V

PKIB8795E

Terminals

Condition

Voltage 

(Approx.)

(+)

(–)

Starter motor

connector

Terminal

F9 (VQ35DE)

E210 (VK45DE)

1 Ground

When the ignition 

switch is in 

START position

Battery voltage

PKIB8796E

Engine coolant temperature

Voltage [V]

−

30 

°

C to 

−

20 

°

C (

−

22 

°

F to 

−

4 

°

F)

8.6

−

19 

°

C to 

−

10 

°

C (

−

2 

°

F to 14

°

F)

9.1

−

9 

°

C to 0 

°

C (16 

°

F to 32 

°

F)

9.5

More than 1 

°

C (More than 34 

°

F)

9.9

SC-14

STARTING SYSTEM

Removal and Installation 

NKS005BU

VQ35DE ENGINE MODELS (2WD)

Removal

1.

Disconnect the battery cable from the negative terminal.

2.

Remove engine front and rear undercover, using power tools.

3.

Remove “B” terminal nut (1).

4.

Disconnect “S” connector (2).

5.

Remove starter motor mounting bolts (A), using power tools.

6.

Remove starter motor downward from the vehicle.

Installation

Installation is the reverse order of removal.

CAUTION:

Be sure to tighten “B” terminal nut carefully.

1.

Starter motor mounting bolt

2.

Harness clip bracket

3.

“S” connector

4.

“B” terminal nut

5.

“B” terminal harness

6.

Starter motor

7.

Oil pan

: N·m (kg-m, ft-lb)

: N·m (kg-m, in-lb)

: Engine front

PKIB8799E

PKIB8800E