2004 INFINITI FX35 bat fl

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STARTING SYSTEM
Revision: 2004 November 2004 FX35/FX45
STARTING SYSTEMPFP:23300
System Description AKS0079C
Power is supplied at all times:

through 40A fusible link (letter F, located in the fuse and fusible link box)

to ignition switch terminal 1

through 15A fuse (No. 78, located in the IPDM E/R)

to CPU of IPDM E/R

through 10A fuse (No. 71, located in the IPDM E/R)

to CPU of IPDM E/R.
When the selector lever in the P or N position, power is supplied:

from TCM, and through A/T assembly terminal 9

to IPDM E/R terminal 53.
Ground is supplied:

to IPDM E/R terminals 38, 50 and 60

from body grounds E21, E50 and E51.
With the ignition switch in the START position, and provided that the IPDM E/R receives a starter relay ON sig-
nal from the CAN lines, the IPDM E/R is energized and power is supplied:

from ignition switch terminal 5

to IPDM E/R terminal 4 and

through IPDM E/R terminal 3

to starter motor terminal 1.
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.

STARTING SYSTEM
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Revision: 2004 November 2004 FX35/FX45
Trouble Diagnosis with Battery/Starting/Charging System TesterAKS0079E
NOTE:
To ensure a complete and thorough diagnosis, the battery, starter and alternator test segments must be done
as a set from start to finish.
1. Turn off all loads on the vehicle electrical system.
2. Perform battery test with Battery/Starting/Charging system
tester. Refer to SC-6, "
Trouble Diagnosis with Battery/Starting/
Charging System Tester" .
3. Press “ENTER” to begin the starting system test.
4. Start the engine.
5. Diagnosis result is displayed on the tester. Refer to SC-13,
"DIAGNOSTIC RESULT ITEM CHART" .
NOTE:

If the starter performs normally but the engine does not start,
perform engine diagnosis.

For intermittent “NO CRANK” or “NO STARTER OPERA-
TION” incidents, refer to SC-16, "
DIAGNOSTIC PROCE-
DURE 2" .
DIAGNOSTIC RESULT ITEM CHART
SEL408X
SEL409X
SEL410X
Diagnostic item Service procedure
CRANKING VOLTAGE NORMAL Go to SC-14, "
WORK FLOW" .
CRANKING VOLTAGE LOW Go to SC-14, "
WORK FLOW" .
CHARGE BATTERYPerform the slow battery charging procedure. (Initial rate of charge is 10A for 12 hours.) Per-
form battery test again with Battery/Starting/Charging system tester. Refer toSC-6, "
Trouble
Diagnosis with Battery/Starting/Charging System Tester" .
REPLACE BATTERYBefore replacing battery, clean the battery cable clamps and battery posts. Perform battery
test again with Battery/Starting/Charging system tester. Refer to SC-6, "
Trouble Diagnosis
with Battery/Starting/Charging System Tester" . If second test result is “REPLACE BAT-
TERY”, then do so. Perform battery test again to confirm repair.

SC-14
STARTING SYSTEM
Revision: 2004 November 2004 FX35/FX45
WORK FLOW
*1SC-6, "Trouble Diagnosis with Bat-
tery/Starting/Charging System
Te s t e r".*2SC-16, "
MINIMUM SPECIFICATION
OF CRANKING VOLTAGE REFER-
ENCING COOLANT TEMPERA-
TURE".*3SC-15, "
DIAGNOSTIC PROCE-
DURE 1".
*4SC-16, "
DIAGNOSTIC PROCE-
DURE 2".
SKIB0227E

STARTING SYSTEM
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Revision: 2004 November 2004 FX35/FX45
DIAGNOSTIC PROCEDURE 1
Check “B” Terminal Circuit
1. CHECK POWER SUPPLY FOR STARTER MOTOR “B” TERMINAL
1. Remove fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is released.
3. Turn ignition switch OFF.
4. Make sure that the starter motor B terminal E313 terminal 2 (B)
*1 or (B/R)*2 connection is clean and tight.
5. Check voltage between starter motor B terminal E313 terminal 2
(B)
*1 or (B/R)*2 and ground using a digital circuit tester.
NOTE:
*1: VK45DE, *2: VQ35DE
OK or NG
OK >> GO TO 2.
NG >> Check harness between the battery and the starter
motor for open circuit.
2. CHECK BATTERY HARNESS CONNECTION (VOLTAGE DROP TEST)
Check voltage between starter motor B terminal E313 terminal 2
(B)
*1 or (B/R)*2 and battery positive terminal using a digital circuit
tester.
NOTE:
*1: VK45DE, *2: VQ35DE
OK or NG
OK >> GO TO 3.
NG >> Check harness between the battery and the starter
motor for poor continuity.
3. CHECK STARTER MOTOR GROUND CIRCUIT (VOLTAGE DROP TEST)
1. Turn ignition switch OFF.
2. Check voltage between starter motor case and battery negative
terminal using a digital circuit tester.
OK or NG
OK >> Starter motor “B” terminal circuit is OK. Further inspec-
tion necessary. Refer to SC-14, "
WORK FLOW" .
NG >> Check the starter motor case and ground for poor conti-
nuity. Battery voltage should exist.
PKIA2842E
When the ignition switch is in START position,
Voltage: Less than 0.5V
PKIA2370E
When the ignition switch is in START position,
Voltage: Less than 0.2V
PKIA2943E

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STARTING SYSTEM
Revision: 2004 November 2004 FX35/FX45
DIAGNOSTIC PROCEDURE 2
Check “S” Connector Circuit
1. CHECK POWER SUPPLY FOR STARTER MOTOR “S” CONNECTOR
1. Remove fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is released.
3. Turn ignition switch OFF.
4. Disconnect starter motor S connector.
5. Check voltage between starter motor harness connector E312
*1
or F33*2 terminal 1 (B) and ground using a digital circuit tester.
NOTE:
*1: VK45DE, *2: VQ35DE
OK or NG
OK >> GO TO 2.
NG >> Check the following.

40A fusible link (letter F , located in fuse and fusible
link box)

Ignition switch

Starter relay [within the IPDM E/R (intelligent power distribution module engine room)].

Harness for open or short
2. CHECK “S” TERMINAL CONNECTION (VOLTAGE DROP TEST)
1. Turn ignition switch OFF.
2. Connect starter motor S connector.
3. Check voltage between starter motor harness connector E312
*1
or F33*2 terminal 1 (B) and battery positive terminal using a dig-
ital circuit tester.
NOTE:
*1: VK45DE, *2: VQ35DE
OK or NG
OK >> Starter motor “S” connector circuit is OK. Further inspec-
tion necessary. Refer to SC-14, "
WORK FLOW" .
NG >> Check harness between the battery and the starter motor “S” connector for poor continuity.
MINIMUM SPECIFICATION OF CRANKING VOLTAGE REFERENCING COOLANT TEMPERA-
TURE
When the ignition switch is in START position,
Battery voltage should exist.
PKIA2807E
When the ignition switch is in START position,
Voltage: Less than 1V
PKIA2808E
Engine coolant temperature Voltage V
−30°C to −20°C (−22°F to −4°F) 8.4
−19°C to −10°C (−2°F to 14°F) 8.9
−9°C to 0°C (16°F to 32°F) 9.3
More than 1°C (More than 34°F) 9.7

STARTING SYSTEM
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Revision: 2004 November 2004 FX35/FX45
Removal and Installation AKS00BQ1
VK45DE ENGINE MODELS
Removal
1. Disconnect negative battery cable.
2. Remove engine front and rear undercover, using power tools.
3. Disconnect S connector.
4. Remove B terminal nut.
5. Remove starter motor mounting bolts.
6. Loosen A/T fluid cooler tube clip bolts. Refer to AT- 2 6 6 ,
"TRANSMISSION ASSEMBLY" in “AUTOMATIC TRANSMIS-
SION (A/T)” section.
7. Remove starter motor to the direction of under side the vehicle.
Installation
Install in the reverse order of removal.
CAUTION:
Be sure to tighten B terminal nut carefully.
1. Starter motor 2. Starter motor mounting bolt 3. B terminal harness
4. B terminal nut 5. S connector 6. Cylinder block
PKIA2809E
PKIA2810E

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STARTING SYSTEM
Revision: 2004 November 2004 FX35/FX45
VQ35DE ENGINE MODELS (2WD)
Removal
1. Disconnect negative battery cable.
2. Remove engine rear undercover, using power tools.
3. Disconnect S connector.
4. Remove B terminal nut.
5. Remove starter motor mounting bolts and harness clip bracket,
using power tools.
6. Remove starter motor to the direction of under side the vehicle.
Installation
Install in the reverse order of removal.
CAUTION:
Be sure to tighten B terminal nut carefully.
1. Starter motor mounting bolt 2. Harness clip bracket 3. S connector
4. B terminal nut 5. B terminal harness 6. Starter motor
7. Oil pan
PKIA3127E
PKIA2812E

STARTING SYSTEM
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Revision: 2004 November 2004 FX35/FX45
VQ35DE ENGINE MODELS (AWD)
Removal
1. Disconnect negative battery cable.
2. Remove engine front and rear undercover, using power tools.
3. Disconnect S connector.
4. Remove B terminal nut.
5. Remove starter motor mounting bolts.
6. Remove starter motor to the direction of under side the vehicle.
Installation
Install in the reverse order of removal.
CAUTION:
Be sure to tighten B terminal nut carefully.
1. Starter motor mounting bolt 2. Oil pan 3. Starter motor
4. B terminal harness 5. B terminal nut 6. S connector
PKIA2843E
PKIA2844E