2008 INFINITI QX56 Factory Service Manual

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Page 3537 of 4083

INFINITI QX56 2008 Factory Service Manual STR-8
< FUNCTION DIAGNOSIS >
STARTING SYSTEM
FUNCTION DIAGNOSIS
STARTING SYSTEM
System DiagramINFOID:0000000001696224
System DescriptionINFOID:0000000001696225
The starter motor plunger closes and pro

Page 3538 of 4083

INFINITI QX56 2008 Factory Service Manual STARTING SYSTEMSTR-9
< FUNCTION DIAGNOSIS >
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STR
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Component DescriptionINFOID:0000000001696227
Component part
Description
TCM TCM supplies power to the starter relay inside t

Page 3539 of 4083

INFINITI QX56 2008 Factory Service Manual STR-10
< COMPONENT DIAGNOSIS >
B TERMINAL CIRCUIT
COMPONENT DIAGNOSIS
B TERMINAL CIRCUIT
DescriptionINFOID:0000000001696228
Terminal "2" (B) is constantly supplied with battery power.
Diagnosis Proced

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INFINITI QX56 2008 Factory Service Manual S CONNECTOR CIRCUITSTR-11
< COMPONENT DIAGNOSIS >
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S CONNECTOR CIRCUIT
DescriptionINFOID:0000000001696230
Terminal "1" (S) is the power supply for the starter mo
tor mag

S CONNECTOR CIRCUITSTR-11
< COMPONENT DIAGNOSIS >
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S CONNECTOR CIRCUIT
DescriptionINFOID:0000000001696230
Terminal "1" (S) is the power supply for the starter mo
tor magnetic switch. Terminal 1 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.
Diagnosis ProcedureINFOID:0000000001696231
CAUTION:
Perform diagnosis under the cond ition that engine cannot start by the following procedure.
1. Remove fuel pump fuse.
2. Crank or start the engine (where possi ble) until the fuel pressure is released.
1.CHECK STARTER MOTOR MAGNETIC SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect starter motor connector F28.
3. Shift transmission into park or neutral.
4. Check voltage between starter motor harness connector F28 terminal 1 and ground with the ignition in START.
Is battery voltage present?
YES >> Magnetic switch circuit is OK. Further inspection necessary. Refer to STR-5, "Work Flow".
NO >> GO TO 2
2.CHECK CONNECTOR
1. Turn ignition switch OFF.
2. Check the IPDM E/R harness connector E120 and starter motor harness connector F28 for damage, bent pins and loose connections.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair the terminal and connector.
3.CHECK HARNESS CONTI NUITY (OPEN CIRCUIT)
1. Disconnect IPDM E/R connector E120 and starter motor con- nector F28.
2. Check continuity between starter motor harness connector F28 (A) terminal 1 and IPDM E/R harness connector E120 (B) termi-
nal 19.
3. Check continuity between starter motor harness connector F28 (A) terminal 1 and ground.
Are the continuity test results as specified?
YES >> Further inspection necessary. Refer to STR-5, "Work Flow".
NO >> Repair the harness.
(+) (-)Condition Voltage
Connector Terminal
F28 1 Ground While cranking the
engine Battery voltage
AWBIA0125GB
AB
Continiuty
Connector Terminal Connector Terminal
F28 1E120 19 Yes
A —Continiuty
Connector Terminal
F28 1Ground No
AWBIA0126GB
Revision: March 2010 2008 QX56

Page 3541 of 4083

INFINITI QX56 2008 Factory Service Manual STR-12
< COMPONENT DIAGNOSIS >
STARTING SYSTEM
STARTING SYSTEM
Wiring DiagramINFOID:0000000001696232
AWBWA0140GB
Revision: March 20102008 QX56

Page 3542 of 4083

INFINITI QX56 2008 Factory Service Manual STARTING SYSTEMSTR-13
< COMPONENT DIAGNOSIS >
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STR
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ALBIA0463GB
Revision: March 2010
2008 QX56

Page 3543 of 4083

INFINITI QX56 2008 Factory Service Manual STR-14
< COMPONENT DIAGNOSIS >
STARTING SYSTEM
ABBIA0785GB
Revision: March 20102008 QX56

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INFINITI QX56 2008 Factory Service Manual STARTING SYSTEMSTR-15
< COMPONENT DIAGNOSIS >
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ALBIA0465GB
Revision: March 2010
2008 QX56

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