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ENGINE

SECTION

STR

STARTING SYSTEM

A

STR

C

D

E

CONTENTS
BASIC INSPECTION ................................... 2
.
DIAGNOSIS AND REPAIR WORKFLOW ......... 2
.

STARTING SYSTEM ......................................... 14

F

Symptom Table ......................................................14
.

Work Flow ................................................................ 2
.

PRECAUTION ............................................. 15
.

FUNCTION DIAGNOSIS .............................. 5
.

PRECAUTIONS ................................................. 15

STARTING SYSTEM .......................................... 5
.
M/T .............................................................................. 5
.
M/T : System Diagram ............................................. 5
.
M/T : System Description ......................................... 5
.
M/T : Component Parts Location ............................. 6
.
M/T : Component Description .................................. 6
.
A/T .............................................................................. 6
.
A/T : System Diagram .............................................. 7
.
A/T : System Description .......................................... 7
.
A/T : Component Parts Location .............................. 7
.
A/T : Component Description .................................. 8
.

COMPONENT DIAGNOSIS ......................... 9
.
B TERMINAL CIRCUIT ...................................... 9
.
Description ............................................................... 9
.
Diagnosis Procedure ................................................ 9
.

S CONNECTOR CIRCUIT .................................10
.
Description ............................................................. 10
.
Diagnosis Procedure .............................................. 10
.

STARTING SYSTEM .........................................11
.
Wiring Diagram - STARTING SYSTEM - ............... 11
.

SYMPTOM DIAGNOSIS ............................. 14
.

Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER" ................................................................15
.
Precaution for Battery Service ................................15
.

PREPARATION .......................................... 16
.

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PREPARATION ................................................. 16
Special Service Tools .............................................16
.
Commercial Service Tools ......................................16
.

ON-VEHICLE REPAIR ................................ 17
.

J

K

STARTER MOTOR ........................................... 17
Exploded View ........................................................17
.
L
M/T ............................................................................18
.
M/T : Removal and Installation ...............................18
.
A/T .............................................................................19
.
A/T : Removal and Installation ................................19
.
Inspection ...............................................................20
.

SERVICE DATA AND SPECIFICATIONS
(SDS) ........................................................... 21
.
SERVICE DATA AND SPECIFICATIONS
(SDS) ................................................................. 21

M

N

O

Starter Motor ..........................................................21
.
P

Revision: 2008 October

STR-1

2009 370Z

DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >

BASIC INSPECTION
Work Flow

INFOID:0000000004457472

OVERALL SEQUENCE

JSBIA0022GB

DETAILED FLOW

STR-2

2009 370Z

NOTE:
To ensure a complete and thorough diagnosis, the battery, starter motor and alternator test segments must be
done as a set from start to finish.

A

1.DIAGNOSIS WITH STARTING/CHARGING SYSTEM TESTER
Perform the starting system test with Starting/Charging System Tester (SST: J-44373). For details and operat- STR
ing instructions, refer to Technical Service Bulletin.
Test result
C
CRANKING VOLTAGE NORMAL>>GO TO 2.
CRANKING VOLTAGE LOW>>GO TO 5.
CHARGE BATTERY>>Perform the slow battery charging procedure. (Initial rate of charge is 10A for 12
D
hours.) Perform battery test again. Refer to Technical Service Bulletin.
REPLACE BATTERY>>Before replacing battery, clean the battery cable clamps and battery posts. Perform
battery test again. Refer to Technical Service Bulletin. If second test result is “REPLACE BATTERY”, then do so. Perform battery test again to confirm repair.
E
CRANKING CHECK

2.

Check that the starter motor operates correctly.
Does the engine crank normally?
YES >> GO TO 3.
NO
>> GO TO 4.

F

G

3.ENGINE START CHECK
Check that the engine starts.
Does the engine start?
YES >> Starter motor is OK. INSPECTION END
NO
>> Starter motor is OK. Perform further diagnosis of engine mechanical or engine control system.
Refer EM and EC sections. Once resolved, perform battery test again.

4.STARTER MOTOR ACTIVATION
Check that the starter motor operates.
Does the starter motor turn?
YES >> Check ring gear and starter motor drive pinion. Once resolved, perform battery test again.
NO
>> GO TO 7.

5.COMPARISON BETWEEN ENGINE COOLANT AND CRANKING VOLTAGE

H

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Compare the engine coolant temperature and the cranking voltage with the specifications.
L

Minimum Specification of Cranking Voltage Referencing Coolant Temperature

Engine coolant temperature [°C (°F)]

Voltage [V]

−30 to −20 (−22 to −4)

8.6

−19 to −10 (−2 to 14)

9.1

−9 to 0 (16 to 32)

9.5

More than 1 (More than 34)

9.9

M

N

Is the voltage less than the specified value?
YES >> GO TO 7.
NO
>> GO TO 6.

O

6.STARTER OPERATION
Check the starter operation status.
Does the starter motor turn smoothly?
YES >> Starter motor is OK. INSPECTION END
NO
>> GO TO 7.

P

7.“B” TERMINAL CIRCUIT INSPECTION
Check “B” terminal circuit. Refer to STR-9, "Diagnosis Procedure".
Is “B” terminal circuit normal?

STR-3

2009 370Z

YES >> GO TO 8.
NO
>> Repair as needed.

8.“S” CONNECTOR CIRCUIT INSPECTION
Check “S” connector circuit. Refer to STR-10, "Diagnosis Procedure".
Is “S” connector circuit normal?
YES >> GO TO 9.
NO
>> Repair as needed.

9.ENGINE ROTATION STATUS
Check that the engine can be rotated by hand.
Does the engine turn freely by hand?
YES >> Replace starter motor.
NO
>> Perform further diagnosis of engine mechanical or powertrain mechanism. Once resolved, perform battery test again. Refer to Technical Service Bulletin.


STR-4

2009 370Z

STARTING SYSTEM
< FUNCTION DIAGNOSIS >

FUNCTION DIAGNOSIS

A

STARTING SYSTEM
M/T

STR

M/T : System Diagram

INFOID:0000000004457473

C

D

E

F

G

H

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JSMIA0095GB

M/T : System Description

J

INFOID:0000000004457474

• When the clutch interlock switch is turned ON, power is supplied to starter relay and starter control relay.
And BCM and IPDM E/R (CPU) detect clutch interlock switch condition by the inputted signal.
• When starter operating condition is satisfied, IPDM E/R turns starter control relay ON by starter control relay
control signal.
• When engine cranking condition is satisfied, BCM turns starter relay ON by starter relay control signal.
• Then battery power is supplied to starter motor (“S” terminal) through starter control relay and starter relay.
And IPDM E/R (CPU) detect starter relay condition by the inputted signal.

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STR-5

2009 370Z

STARTING SYSTEM

M/T : Component Parts Location

INFOID:0000000004457475

JSBIA0038ZZ

BCM
Refer to BCS-8, "Component Parts
Location".

4.

Engine

IPDM E/R
Refer to PCS-5, "Component Parts
Location".

3.

Starter motor

Clutch pedal

Clutch interlock switch

A.

2.

B.

1.

M/T : Component Description

INFOID:0000000004458493

Component part

Description

Clutch interlock switch

The switch turns ON and electric power is supplied to the starter
relay and starter control relay inside IPDM E/R when the clutch
pedal is depressed.

BCM

BCM controls the starter relay inside IPDM E/R.

IPDM E/R

CPU inside IPDM E/R controls the starter control relay.

Starter motor

The starter motor plunger closes and the motor is supplied with
battery power, which in turn cranks the engine, when the “S” terminal is supplied with electric power.

A/T


STR-6

2009 370Z

STARTING SYSTEM

A/T : System Diagram

INFOID:0000000004457498

A

STR

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D

E

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JSMIA0096GB

A/T : System Description

INFOID:0000000004457497

• When selector lever is P or N, power is supplied to starter relay and starter control relay by TCM. And BCM
and IPDM E/R (CPU) detect selector lever P/N condition by the inputted signal.
• When starter operating condition is satisfied, IPDM E/R turns starter control relay ON by starter control relay
control signal.
• When engine cranking condition is satisfied, BCM turns starter relay ON by starter relay control signal.
• Then battery power is supplied to starter motor (“S” terminal) through starter control relay and starter relay.
And IPDM E/R (CPU) detect starter relay condition by the inputted signal.

A/T : Component Parts Location

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INFOID:0000000004457476

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JSBIA0039ZZ


STR-7

2009 370Z

STARTING SYSTEM
1.

BCM
Refer to BCS-8, "Component Parts
Location".

4.

IPDM E/R
Refer to PCS-5, "Component Parts
Location".

3.

TCM
Refer to TM-142, "Component Description".

Starter motor

A.

2.

Engine

A/T : Component Description

INFOID:0000000004457496

Component part

Description

TCM

TCM supplies power to the starter relay and starter control relay
inside IPDM E/R when the selector lever is shifted to the P or N
position.

BCM

BCM controls the starter relay inside IPDM E/R.

IPDM E/R

CPU inside IPDM E/R controls the starter control relay.

Starter motor

The starter motor plunger closes and the motor is supplied with
battery power, which in turn cranks the engine, when the “S” terminal is supplied with electric power.


STR-8

2009 370Z

B TERMINAL CIRCUIT
< COMPONENT DIAGNOSIS >

COMPONENT DIAGNOSIS

A

B TERMINAL CIRCUIT
Description

INFOID:0000000004457478

STR

INFOID:0000000004457479

C

The “B” terminal is constantly supplied with battery power.

Diagnosis Procedure

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.

D

1.CHECK “B” TERMINAL CIRCUIT
1.
2.
3.

E

Turn ignition switch OFF.
Check that starter motor “B” terminal connection is clean and tight.
Check voltage between starter motor “B” terminal and ground.

F

Terminals
(+)
Starter motor “B” terminal

Terminal

E204

Voltage (Approx.)

(–)

2

Ground

G

Battery voltage

Is the inspection result normal?
YES >> GO TO 2.
NO
>> Check harness between battery and starter motor for open circuit.

H

2.CHECK BATTERY CABLE CONNECTION STATUS (VOLTAGE DROP TEST)

I

1.
2.

Shift A/T selector lever to “P” or “N” position. (A/T models)
Keep depressing clutch pedal fully. (M/T models)
Check voltage between battery positive terminal and starter motor “B” terminal.

J

Terminals

K

(–)

Condition

(+)

Starter motor
“B” terminal
E204

2

When the ignition switch is
in START position

Less than
0.5 V

Terminal

Battery positive terminal

Voltage (Approx.)

L

YES >> GO TO 3.
NO
>> Check harness between the battery and the starter motor for poor continuity.

M

3.CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)
1.
2.

N

Check voltage between starter motor case and battery negative terminal.
Terminals
(+)
Starter motor case

Condition

Voltage (Approx.)

When the ignition switch is in
START position

Less than 0.2 V

(–)
Battery negative terminal

O

YES >> “B” terminal circuit is OK. Further inspection is necessary. Refer to STR-2, "Work Flow".
NO
>> Check the starter motor case and ground for poor continuity.


STR-9

2009 370Z

P

S CONNECTOR CIRCUIT

S CONNECTOR CIRCUIT
Description

INFOID:0000000004457480

The starter motor magnetic switch is supplied with power when the ignition switch is turned to the START position while the selector lever is in the P or N position for A/T models or the clutch pedal is depressed for M/T
models.

Diagnosis Procedure

INFOID:0000000004457481

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.
2.
3.
4.

Turn ignition switch OFF.
Disconnect starter motor connector.
Check voltage between starter motor harness connector and ground.
Terminals
(+)
Starter motor harness connector

Terminal

F52

Condition

Voltage (Approx.)

When the ignition switch is in
START position

Battery voltage

(–)

1

Ground

YES >> “S” connector circuit is OK. Further inspection is necessary. Refer to STR-2, "Work Flow".
NO
>> GO TO 2.

2.CHECK HARNESS CONTINUITY (OPEN CIRCUIT)
1.
2.

Disconnect IPDM E/R connector.
Check continuity between starter motor harness connector and IPDM E/R harness connector.
Starter motor harness connector

IPDM E/R harness connector

Connector No.

Terminal No.

Connector No.

Terminal No.

F52

1

E7

80

Continuity
Existed

YES >> Further inspection is necessary. Refer to STR-2, "Work Flow".
NO
>> Repair the harness.


STR-10

2009 370Z

STARTING SYSTEM

STARTING SYSTEM

A

Wiring Diagram - STARTING SYSTEM -

INFOID:0000000004457482

STR

C

D

E

F

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JCBWA1064GB


STR-11

2009 370Z

STARTING SYSTEM

JCBWA1065GB


STR-12

2009 370Z

STARTING SYSTEM
A

STR

C

D

E

F

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JCBWA1066GB

P


STR-13

2009 370Z

STARTING SYSTEM
< SYMPTOM DIAGNOSIS >

SYMPTOM DIAGNOSIS
STARTING SYSTEM
Symptom Table

INFOID:0000000004457483

Symptom
No normal cranking
Starter motor does not rotate


Reference
Refer to STR-2, "Work Flow".

STR-14

2009 370Z

PRECAUTIONS
< PRECAUTION >

PRECAUTION

A

PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"

STR

INFOID:0000000004769555

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the “SRS AIRBAG” and “SEAT BELT” of this
Service Manual.
WARNING:
• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal
injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag
Module, see the “SRS AIRBAG”.
• Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness
connectors.

C

D

E

F

G

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

H

When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors while ignition switch is
ON or engine is running, never use air or electric power tools or strike near the sensor(s) with a hammer.
Heavy vibration may activate the sensor(s), deploy the airbag(s), possibly cause serious injury.
When using air or electric power tools or hammers, always turn OFF ignition switch, disconnect the battery,
and wait 3 minutes or more before performing any service.

I

Precaution for Battery Service

J

INFOID:0000000004769556

Before disconnecting the battery, lower both the driver and passenger windows. This will prevent any interference between the window edge and the vehicle when the door is opened/closed. During normal operation, the
window slightly raises and lowers automatically to prevent any window to vehicle interference. The automatic
window function will not work with the battery disconnected.

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STR-15

2009 370Z

PREPARATION
< PREPARATION >

PREPARATION
PREPARATION
Special Service Tools

INFOID:0000000004457485

Tool number
(Kent-Moore No.)
Tool name

Description

—
(J-44373 Model MCR620)
Starting/Charging System Tester

SEL403X

Tests starting and charging systems.
For operating instructions, refer to Technical
Service Bulletin.

Commercial Service Tools

INFOID:0000000004457486

Tool name

Description

Power tool

Loosening bolts, nuts and screws

PIIB1407E


STR-16

2009 370Z

STARTER MOTOR
< ON-VEHICLE REPAIR >

ON-VEHICLE REPAIR

A

STARTER MOTOR
Exploded View

INFOID:0000000004457487

STR

REMOVAL
C

D

E

F

G

H
JPBIA0147GB

1.

“B” terminal nut

2.

“B” terminal harness

3.

Starter motor

4.

Harness clip bracket

5.

Starter motor mounting bolt

6.

Converter housing (A/T models)
Transmission case (M/T models)

7.

“S” connector

I

J

: Engine front
Refer to GI-4, "Components" for symbols in the figure.

DISASSEMBLY

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STR-17

2009 370Z

STARTER MOTOR
Type: 114-932

JPBIA0148GB

1.

Magnetic switch assembly

2.

Dust cover kit

3.

Shift lever set

4.

Center bracket (A)

5.

Yoke assembly

6.

Armature assembly

7.

Brush holder assembly

8.

Thrust washer

9.

Rear cover assembly

10. Shaft gear assembly

11. Packing

12. Thrust washer

13. Center bracket (P)

14. E-ring

15. Pinion assembly

16. Pinion stopper

17. Pinion stopper clip

18. Gear case assembly

: High-temperature grease point
Refer to GI-4, "Components" for symbols not described on the above.

M/T
M/T : Removal and Installation

INFOID:0000000004457488

Removal
1.
2.
3.

Disconnect the battery cable from the negative terminal.
Remove engine undercover using power tools.
Remove “B” terminal nut (1).

PKIB8802E


STR-18

2009 370Z

STARTER MOTOR
4. Disconnect “S” connector (A).
5. Remove starter motor mounting bolts (B) and harness bracket,
using power tools.

A

: Vehicle front

STR

C
JPBIA1187ZZ

6.

D

Remove starter motor (1) forward from the vehicle.
: Vehicle front

E

F

G
JSBIA0040ZZ

INSTALLATION
Install in the reverse order of removal.
CAUTION:
Be sure to tighten “B” terminal nut carefully.

H

A/T

I

A/T : Removal and Installation

INFOID:0000000004458487

J

Removal
1.
2.
3.

Disconnect the battery cable from the negative terminal.
Remove engine undercover using power tools.
Remove “B” terminal nut (1).

K

L

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N
PKIB8802E

4.
5.

Disconnect “S” connector (A).
Remove starter motor mounting bolts (B) and harness bracket,
using power tools.

O

P
: Vehicle front

JPBIA1187ZZ


STR-19

2009 370Z

STARTER MOTOR
6. Remove the bolt (A) and remove the harness bracket (1).
: Vehicle front

JSBIA0011ZZ

7.
8.
9.

Remove A/T fluid cooler tube clip bolts and bracket. Refer to TM-295, "Exploded View".
Move A/T fluid cooler tube (1) downward.
Remove starter motor (2) forward from the vehicle.
: Vehicle front

JSBIA0041ZZ

INSTALLATION
Install in the reverse order of removal.
CAUTION:
Be sure to tighten “B” terminal nut carefully.

Inspection

INFOID:0000000004457490

INSPECTION AFTER DISASSEMBLY
Pinion/Clutch Check

1.
2.

3.

Inspect pinion teeth.
• Replace pinion if teeth are worn or damaged. (Also check condition of ring gear teeth.)
Inspect reduction gear teeth.
• Replace reduction gear if teeth are worn or damaged. (Also check condition of armature shaft gear
teeth.)
Check to see if pinion locks in one direction and rotates smoothly in the opposite direction.
• If it locks or rotates in both directions, or unusual resistance is evident, replace.


STR-20

2009 370Z

SERVICE DATA AND SPECIFICATIONS (SDS)
< SERVICE DATA AND SPECIFICATIONS (SDS)


A

Starter Motor

INFOID:0000000004457494

S114-932
Type

STR

C

HITACHI make
Reduction gear type

System voltage

12

Terminal voltage
No-load

[V]
[V]

11

Current

[A]

Less than 110

Revolution

[rpm]

D

E

More than 2,700

Minimum diameter of commutator

[mm (in)]

28.0 (1.102)

Minimum length of brush

[mm (in)]

10.5 (0.413)

Brush spring tension

[N (kg, lb)]

Clearance between bearing metal and armature shaft

[mm (in)]

Less than 0.2 (0.008)

Clearance between pinion front edge and pinion stopper

[mm (in)]

F

16.2 (1.65, 3.6)

0.3 - 2.5 (0.012 – 0.098)

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STR-21

2009 370Z

�ݺ�ߣ

Str

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