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Nissan Murano Z51 (2008 year). Manual - part 374

STARTING SYSTEM

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FUNCTION DIAGNOSIS

STARTING SYSTEM

System Diagram

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System Description

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The starter motor plunger closes and provides a closed circuit between the battery and starter motor. The
starter motor is grounded to the engine block. With power and ground supplied, cranking occurs and the
engine starts.

Component Parts Location

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JPBIA1665GB

Starter motor

BCM

TCM

IPDM E/R

Cylinder block left side

Behind the combination meter

Engine room dash panel (LH)

JPBIA1756ZZ

Revision: 2008 October

2009 Murano

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STARTING SYSTEM

Component Description

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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” ter-
minal is supplied with electric power.

Revision: 2008 October

2009 Murano

B TERMINAL CIRCUIT

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COMPONENT DIAGNOSIS

B TERMINAL CIRCUIT

Description

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

Diagnosis Procedure

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CAUTION:

Perform diagnosis under the condition that engine cannot start by the following procedure.
1.

Remove fuel pump fuse.

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

CHECK “B” TERMINAL CIRCUIT

Turn ignition switch OFF.

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

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

Is the inspection result normal?

YES

>> GO TO 2.

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

CHECK BATTERY CABLE CONNECTION STATUS (VOLTAGE DROP TEST)

Shift the selector lever to “P” or “N” position.

Check voltage between battery positive terminal and starter motor “B” terminal.

Is the inspection result normal?

YES

>> GO TO 3.

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

CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)

Shift the selector lever to “P” or “N” position.

Check voltage between starter motor case and battery negative terminal.

Is the inspection result normal?

YES

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

STR-2, "Work Flow"

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

Terminals

Voltage (Approx.)

(+)

(–)

Starter motor “B” terminal

Terminal

F10

2 Ground

Battery

voltage

Terminals

Condition

Voltage (Approx.)

(+)

(–)

Starter motor

“B” terminal

Terminal

Battery positive terminal

F10

When the ignition switch is

in START position

Less than

0.5 V

Terminals

Condition

Voltage (Approx.)

(+)

(–)

Starter motor case

Battery negative terminal

When the ignition switch is in

START position

Less than 0.2 V

Revision: 2008 October

2009 Murano

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S CONNECTOR CIRCUIT

S CONNECTOR CIRCUIT

Description

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The starter motor magnetic switch is supplied with power when the ignition switch is turned to the START posi-
tion while the selector lever is in the P or N position.

Diagnosis Procedure

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CAUTION:

Perform diagnosis under the condition that engine cannot start by the following procedure.
1.

Remove fuel pump fuse.

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

CHECK “S” CONNECTOR CIRCUIT

Turn ignition switch OFF.

Disconnect starter motor connector.

Shift the selector lever to “P” or “N” position.

Check voltage between starter motor harness connector and ground.

Is the inspection result normal?

YES

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

STR-2, "Work Flow"

>> GO TO 2.

CHECK HARNESS CONTINUITY (OPEN CIRCUIT)

Disconnect IPDM E/R connector.

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

Is the inspection result normal?

YES

>> Further inspection is necessary. Refer to

SEC-8, "Work Flow"

in SEC section.

>> Repair the harness.

Terminals

Condition

Voltage (Approx.)

(+)

(–)

Starter motor har-

ness connector

Terminal

F47

1 Ground

When the ignition switch is in

START position

Battery voltage

Starter motor harness connector

IPDM E/R harness connector

Continuity

Connector No.

Terminal No.

Connector No.

Terminal No.

F47

F12

Existed

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2009 Murano

STARTING SYSTEM

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STARTING SYSTEM

Wiring Diagram - STARTING SYSTEM -

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JCBWM1068GB

Revision: 2008 October

2009 Murano

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STARTING SYSTEM

JCBWM1069GB

Revision: 2008 October

2009 Murano

STARTING SYSTEM

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JCBWM1070GB

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2009 Murano

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STARTING SYSTEM

SYMPTOM DIAGNOSIS

STARTING SYSTEM

Symptom Table

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Symptom

Reference

No normal cranking

Refer to

STR-2, "Work Flow"

Starter motor does not rotate

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2009 Murano

PRECAUTIONS

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PRECAUTION

PRECAUTIONS

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

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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”.

• Do not 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 har-
ness connectors.

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2009 Murano

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PREPARATION

PREPARATION

Special Service Tools

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Commercial Service Tools

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Tool number
(Kent-Moore No.)
Tool name

Description

—

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

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

SEL403X

Tool name

Description

Power tool

Loosening bolts, nuts and screws

PIIB1407E

Revision: 2008 October

2009 Murano

STARTER MOTOR

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ON-VEHICLE REPAIR

STARTER MOTOR

Exploded View

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REMOVAL

DISASSEMBLY

Type: M000TA0072

Converter housing

“B” terminal harness

Starter motor “B” terminal nut

Starter motor mounting bolt

Starter motor

“S” connector

Refer to

GI-4, "Components"

for symbols in the figure.

JPBIA1922GB

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STARTER MOTOR

Removal and Installation

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REMOVAL

Remove the battery Refer to

PG-106, "Removal and Installation"

Remove the air cleaner assembly and air ducts.

Disconnect the following unit connectors:
• ECM
• TCM
• IPDM E/R

Remove the battery tray.

Disconnect the starter motor harness connectors.

Remove the starter motor mounting bolts, using power tools.

Remove the starter motor.

INSTALLATION

Installation is in the reverse order of removal.

Inspection

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INSPECTION AFTER DISASSEMBLY

Pinion/Clutch Check

Magnetic switch assembly

Dust cover kit

Gear case assembly

Pinion assembly

Stopper

Ring

Stopper

Yoke assembly

10. Armature assembly

11.

Brush holder assembly

12. Metal

13. Rear cover

14. Gear assembly

15. Shift lever set

16. Clutch gear assembly

17. Center bracket

18. Packing

19. Gear shaft

Refer to

GI-4, "Components"

for symbols not described on the above.

JPBIA1777GB

Revision: 2008 October

2009 Murano

STARTER MOTOR

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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.

Revision: 2008 October

2009 Murano