ENGINE
SECTION
STARTING SYSTEM
STR STR
E
CONTENTS
BASIC INSPECTION .................................... 2 Symptom Table .......................................................12 F
DIAGNOSIS AND REPAIR WORKFLOW .......... 2 PRECAUTION .............................................. 13
Work Flow ................................................................. 2 G
PRECAUTIONS ................................................. 13
FUNCTION DIAGNOSIS ............................... 5 Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
STARTING SYSTEM ........................................... 5 SIONER" .................................................................13 H
System Diagram ........................................................ 5
System Description ................................................... 5 PREPARATION ........................................... 14
Component Parts Location ........................................ 5 I
Component Description ............................................ 6 PREPARATION ................................................. 14
Special Service Tools ..............................................14
COMPONENT DIAGNOSIS .......................... 7 Commercial Service Tools .......................................14
J
B TERMINAL CIRCUIT ....................................... 7 ON-VEHICLE REPAIR ................................. 15
Description ................................................................ 7
Diagnosis Procedure ................................................. 7 STARTER MOTOR ........................................... 15
Exploded View .........................................................15 K
S CONNECTOR CIRCUIT ................................... 8 Removal and Installation .........................................16
Description ................................................................ 8 Inspection ................................................................16
Diagnosis Procedure ................................................. 8 L
SERVICE DATA AND SPECIFICATIONS
STARTING SYSTEM ........................................... 9 (SDS) ............................................................ 18
Wiring Diagram - STARTING SYSTEM - .................. 9
M
SERVICE DATA AND SPECIFICATIONS
SYMPTOM DIAGNOSIS .............................. 12 (SDS) ................................................................. 18
Starter Motor ...........................................................18
STARTING SYSTEM ..........................................12 N
Revision: 2008 October STR-1 2009 Murano
DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >
BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow INFOID:0000000003412966
OVERALL SEQUENCE
JSMIA0056GB
DETAILED FLOW
Revision: 2008 October STR-2 2009 Murano
DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >
NOTE:
To ensure a complete and thorough diagnosis, the battery, starter motor and alternator test segments must be A
done as a set from start to finish.
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
hours.) Perform battery test again. Refer to Technical Service Bulletin. D
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 BAT-
TERY”, then do so. Perform battery test again to confirm repair. E
2. CRANKING CHECK
Check that the starter motor operates correctly.
Does the engine crank normally? F
YES >> GO TO 3.
NO >> GO TO 4.
G
3.ENGINE START CHECK
Check that the engine starts.
Does the engine start? H
YES >> Starter motor is OK. INSPECTION END
NO >> Perform further diagnosis of engine mechanical or engine control system. Once resolved, perform
battery test again. I
4.STARTER MOTOR ACTIVATION
Check that the starter motor operates.
J
Does the starter motor turn?
YES >> Check ring gear and starter motor drive pinion. Once resolved, perform battery test again.
NO >> GO TO 7.
K
5.COMPARISON BETWEEN ENGINE COOLANT AND CRANKING VOLTAGE
Compare the engine coolant temperature and the cranking voltage with the specifications.
Minimum Specification of Cranking Voltage Referencing Coolant Temperature
L
Engine coolant temperature [°C (°F)] Voltage [V]
−30 to −20 (−22 to −4) 8.6
M
−19 to −10 (−2 to 14) 9.1
−9 to 0 (16 to 32) 9.5
More than 1 (More than 34) 9.9 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. P
Does the starter motor turn smoothly?
YES >> Starter motor is OK. INSPECTION END
NO >> GO TO 7.
7.“B” TERMINAL CIRCUIT INSPECTION
Check “B” terminal circuit. Refer to STR-7, "Diagnosis Procedure".
Is “B” terminal circuit normal?
Revision: 2008 October STR-3 2009 Murano
DIAGNOSIS AND REPAIR WORKFLOW
< BASIC INSPECTION >
YES >> GO TO 8.
NO >> Repair as needed.
8.“S” CONNECTOR CIRCUIT INSPECTION
Check “S” connector circuit. Refer to STR-8, "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, per-
form battery test again. Refer to Technical Service Bulletin.
Revision: 2008 October STR-4 2009 Murano
STARTING SYSTEM
< FUNCTION DIAGNOSIS >
FUNCTION DIAGNOSIS A
STARTING SYSTEM
System Diagram INFOID:0000000003412967
STR
I
JPBIA1665GB
J
System Description INFOID:0000000003412968
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 K
engine starts.
Component Parts Location INFOID:0000000003412969
L
O
JPBIA1756ZZ
1. Starter motor 2. BCM 3. TCM
P
4. IPDM E/R
A. Cylinder block left side B. Behind the combination meter C. Engine room dash panel (LH)
Revision: 2008 October STR-5 2009 Murano
STARTING SYSTEM
< FUNCTION DIAGNOSIS >
Component Description INFOID:0000000003412970
Component part Description
TCM supplies power to the starter relay and starter control relay
TCM 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.
The starter motor plunger closes and the motor is supplied with
Starter motor battery power, which in turn cranks the engine, when the “S” ter-
minal is supplied with electric power.
Revision: 2008 October STR-6 2009 Murano
B TERMINAL CIRCUIT
< COMPONENT DIAGNOSIS >
COMPONENT DIAGNOSIS A
B TERMINAL CIRCUIT
Description INFOID:0000000003412971
STR
The “B” terminal is constantly supplied with battery power.
Diagnosis Procedure INFOID:0000000003412972 C
CAUTION:
Perform diagnosis under the condition that engine cannot start by the following procedure.
1. Remove fuel pump fuse. D
2. Crank or start the engine (where possible) until the fuel pressure is released.
1.CHECK “B” TERMINAL CIRCUIT E
1. Turn ignition switch OFF.
2. Check that starter motor “B” terminal connection is clean and tight.
3. Check voltage between starter motor “B” terminal and ground.
F
Terminals
(+) Voltage (Approx.)
(–) G
Starter motor “B” terminal Terminal
F10 2 Ground Battery voltage
Is the inspection result normal? H
YES >> GO TO 2.
NO >> Check harness between battery and starter motor for open circuit.
2.CHECK BATTERY CABLE CONNECTION STATUS (VOLTAGE DROP TEST) I
1. Shift the selector lever to “P” or “N” position.
2. Check voltage between battery positive terminal and starter motor “B” terminal. J
Terminals
(–)
Condition Voltage (Approx.) K
(+) Starter motor
Terminal
“B” terminal
When the ignition switch is Less than L
Battery positive terminal F10 2
in START position 0.5 V
Is the inspection result normal?
YES >> GO TO 3. M
NO >> Check harness between the battery and the starter motor for poor continuity.
3.CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)
1. Shift the selector lever to “P” or “N” position. N
2. Check voltage between starter motor case and battery negative terminal.
Terminals O
Condition Voltage (Approx.)
(+) (–)
When the ignition switch is in
Starter motor case Battery negative terminal Less than 0.2 V P
START position
Is the inspection result normal?
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.
Revision: 2008 October STR-7 2009 Murano
S CONNECTOR CIRCUIT
< COMPONENT DIAGNOSIS >
S CONNECTOR CIRCUIT
Description INFOID:0000000003412973
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 INFOID:0000000003412974
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. Shift the selector lever to “P” or “N” position.
4. Check voltage between starter motor harness connector and ground.
Terminals
(+)
Condition Voltage (Approx.)
Starter motor har- (–)
Terminal
ness connector
When the ignition switch is in
F47 1 Ground Battery voltage
START position
Is the inspection result normal?
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. Disconnect IPDM E/R connector.
2. Check continuity between starter motor harness connector and IPDM E/R harness connector.
Starter motor harness connector IPDM E/R harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
F47 1 F12 80 Existed
Is the inspection result normal?
YES >> Further inspection is necessary. Refer to SEC-8, "Work Flow" in SEC section.
NO >> Repair the harness.
Revision: 2008 October STR-8 2009 Murano
STARTING SYSTEM
< COMPONENT DIAGNOSIS >
STARTING SYSTEM
A
Wiring Diagram - STARTING SYSTEM - INFOID:0000000003412975
STR
P
JCBWM1068GB
Revision: 2008 October STR-9 2009 Murano
STARTING SYSTEM
< COMPONENT DIAGNOSIS >
JCBWM1069GB
Revision: 2008 October STR-10 2009 Murano
STARTING SYSTEM
< COMPONENT DIAGNOSIS >
STR
JCBWM1070GB
Revision: 2008 October STR-11 2009 Murano
STARTING SYSTEM
< SYMPTOM DIAGNOSIS >
SYMPTOM DIAGNOSIS
STARTING SYSTEM
Symptom Table INFOID:0000000003412976
Symptom Reference
No normal cranking
Refer to STR-2, "Work Flow".
Starter motor does not rotate
Revision: 2008 October STR-12 2009 Murano
PRECAUTIONS
< PRECAUTION >
PRECAUTION A
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT STR
PRE-TENSIONER" INFOID:0000000003412977
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along C
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. D
Information necessary to service the system safely is included in the “SRS AIRBAG” and “SEAT BELT” of this
Service Manual.
WARNING: E
• 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.
F
• 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 G
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-
ness connectors.
H
Revision: 2008 October STR-13 2009 Murano
PREPARATION
< PREPARATION >
PREPARATION
PREPARATION
Special Service Tools INFOID:0000000003412978
Tool number
(Kent-Moore No.) Description
Tool name
—
(J-44373 Model MCR620)
Starting/Charging System Tester
Tests starting and charging systems.
For operating instructions, refer to Technical
SEL403X
Service Bulletin.
Commercial Service Tools INFOID:0000000003412979
Tool name Description
Power tool Loosening bolts, nuts and screws
PIIB1407E
Revision: 2008 October STR-14 2009 Murano
STARTER MOTOR
< ON-VEHICLE REPAIR >
ON-VEHICLE REPAIR A
STARTER MOTOR
Exploded View INFOID:0000000003469056
STR
REMOVAL
C
J
JPBIA1922GB
1. Converter housing 2. “B” terminal harness 3. Starter motor “B” terminal nut K
4. Starter motor mounting bolt 5. Starter motor 6. “S” connector
Refer to GI-4, "Components" for symbols in the figure.
L
DISASSEMBLY
Type: M000TA0072
M
Revision: 2008 October STR-15 2009 Murano
STARTER MOTOR
< ON-VEHICLE REPAIR >
JPBIA1777GB
1. Magnetic switch assembly 2. Dust cover kit 3. Gear case assembly
4. Pinion assembly 5. Stopper 6. Ring
7. Ring 8. Stopper 9. 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.
Removal and Installation INFOID:0000000003416500
REMOVAL
1. Remove the battery Refer to PG-106, "Removal and Installation".
2. Remove the air cleaner assembly and air ducts.
3. Disconnect the following unit connectors:
• ECM
• TCM
• IPDM E/R
4. Remove the battery tray.
5. Disconnect the starter motor harness connectors.
6. Remove the starter motor mounting bolts, using power tools.
7. Remove the starter motor.
INSTALLATION
Installation is in the reverse order of removal.
Inspection INFOID:0000000003469058
INSPECTION AFTER DISASSEMBLY
Pinion/Clutch Check
Revision: 2008 October STR-16 2009 Murano
STARTER MOTOR
< ON-VEHICLE REPAIR >
1. Inspect pinion teeth.
• Replace pinion if teeth are worn or damaged. (Also check condition of ring gear teeth.) A
2. Inspect reduction gear teeth.
• Replace reduction gear if teeth are worn or damaged. (Also check condition of armature shaft gear
teeth.) STR
3. 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.
C
Revision: 2008 October STR-17 2009 Murano
SERVICE DATA AND SPECIFICATIONS (SDS)
< SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
SERVICE DATA AND SPECIFICATIONS (SDS)
Starter Motor INFOID:0000000003412983
M000TA0072
Type MITSUBISHI make
Reduction gear type
System voltage (V) 12
Terminal voltage (V) 11
No-load Current (A) Less than 90
Revolution (rpm) More than 2,400
Minimum diameter of commutator [mm (in)] 28.0 (1.102)
Minimum length of brush [mm (in)] 5.5 (0.217)
Brush spring tension [N (kg, lb)] 15.0 - 20.4 (1.5 - 3.4)
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)] 0.5 - 2.0 (0.020 - 0.079)
Revision: 2008 October STR-18 2009 Murano
