INFINITI QX56 2011 Factory Service Manual

PRECAUTIONSSTR-3
< PRECAUTION >
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5. When the repair work is completed, re-connect both
battery cables. With the brake pedal released, turn
the push-button ignition switch from ACC position to ON position, then to LOCK position. (The steering
wheel will lock when the push-button ignition switch is turned to LOCK position.)
6. Perform self-diagnosis check of a ll control units using CONSULT-III.
Revision: 2010 May2011 QX56

STR-4
< PREPARATION >
PREPARATION
PREPARATION
PREPARATION
Special Service ToolsINFOID:0000000006275531
Commercial Service ToolsINFOID:0000000006275532
Tool number
(Kent-Moore No.) Tool name Description
—
(J-44373 Model MCR620)
Starting/Charging System Tester Tests starting and charging systems.
For operating instructio
ns, refer to Technical
Service Bulletin.
SEL403X
Tool name Description
Power tool Loosening bolts, nuts and screws
PIIB1407E
Revision: 2010 May2011 QX56

COMPONENT PARTSSTR-5
< SYSTEM DESCRIPTION >
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006275518
Component DescriptionINFOID:0000000006275519
1. IPDM E/R
Refer to PCS-4, "
Component Parts
Location". 2. Starter motor 3. TCM
Refer to TM-10, "
A/T CONTROL SYS-
TEM : Component Parts Location".
4. BCM Refer to BCS-4, "
BODY CONTROL
SYSTEM : Componen t Parts Loca-
tion".
A. Engine
JMBIA2982ZZ
Component part Description
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.
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.
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STR-6
< SYSTEM DESCRIPTION >
SYSTEM
SYSTEM
System DiagramINFOID:0000000006275520
System DescriptionINFOID:0000000006275521
 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 tu rns 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 re lay condition by the inputted signal.
JMBIA2983GB
Revision: 2010 May2011 QX56

STARTING SYSTEMSTR-7
< WIRING DIAGRAM >
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WIRING DIAGRAM
STARTING SYSTEM
Wiring DiagramINFOID:0000000006275522
JCBWM2110GB
Revision: 2010 May2011 QX56

STR-8
< WIRING DIAGRAM >
STARTING SYSTEM
J C B W M 2 111 G B
Revision: 2010 May2011 QX56

STARTING SYSTEMSTR-9
< WIRING DIAGRAM >
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JCBWM2112GB
Revision: 2010 May2011 QX56

STR-10
< WIRING DIAGRAM >
STARTING SYSTEM
JCBWM2113GB
Revision: 2010 May2011 QX56

DIAGNOSIS AND REPAIR WORKFLOWSTR-11
< BASIC INSPECTION >
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BASIC INSPECTION
DIAGNOSIS AND REPAIR WORKFLOW
Work FlowINFOID:0000000006275533
OVERALL SEQUENCE
DETAILED FLOW
JSBIA0022GB
Revision: 2010 May2011 QX56

STR-12
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORKFLOW
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.
1.DIAGNOSIS WITH STARTING /CHARGING SYSTEM TESTER
Perform the starting system test with Starting/Char ging System Tester (SST: J-44373). For details and operat-
ing instructions, refer to Technical Service Bulletin.
Te s t r e s u l t
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. Re fer to Technical Service Bulletin.
REPLACE BATTERY>>Before replacing battery, clean t he battery cable clamps and battery posts. Perform
battery test again. Refer to Technical Service Bu lletin. If second test result is “REPLACE BAT-
TERY”, then do so. Perform battery test again to confirm repair.
2.CRANKING CHECK
Check that the starter motor operates correctly.
Does the engine crank normally?
YES >> GO TO 3.
NO >> GO TO 4.
3.ENGINE START CHECK
Check that the engine starts.
Does the engine start?
YES >> Starter motor is OK. INSPECTION END
NO >> Perform further diagnosis of engine mechanical or engine control system. Refer EM and EC sec-
tions. 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
Compare the engine coolant temperature and the cranking voltage with the specifications.
Minimum Specification of Cranking Voltage Referencing Coolant Temperature
Is the voltage less than the specified value?
YES >> GO TO 7.
NO >> GO TO 6.
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.
7.“B” TERMINAL CIRCUIT INSPECTION
Check “B” terminal circuit. Refer to STR-14, "
Diagnosis Procedure".
Is
“B” terminal circuit normal?
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
Revision: 2010 May2011 QX56