pg power INFINITI FX35 2004 Service Manual

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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
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

CHARGING SYSTEM
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Revision: 2004 November 2004 FX35/FX45
CHARGING SYSTEMPFP:23100
System DescriptionAKS0079I
The alternator provides DC voltage to operate the vehicle's electrical system and to keep the battery charged.
The voltage output is controlled by the IC regulator.
Power is supplied at all times:

through 10A fuse (No. 33, located in the fuse and fusible link box)

to alternator terminal 4 (S).
Terminal B supplies power to charge the battery and operate the vehicle's electrical system. Output voltage is
controlled by the IC regulator at terminal 4 (S) detecting the input voltage.
The charging circuit is protected by the 120A fusible link (VK45DE and VQ35DE AWD).
The alternator is grounded to the engine block.
With the ignition switch in the ON or START position, power is supplied:

through 10A fuse [No. 14, located in the fuse block (J/B)]

to combination meter terminal 7 for the charge warning lamp.
Ground is supplied:

to combination meter terminal 2

through alternator terminal 3 (L)

to alternator terminal E (VK45DE) or through body ground (VQ35DE)

through body ground E304 (VK45DE).
With power and ground supplied, the charge warning lamp will illuminate. When the alternator is providing suf-
ficient voltage with the engine running, the ground is opened and the charge warning lamp will go off.
If the charge warning lamp illuminates with the engine running, a malfunction is indicated.

SC-34
CHARGING SYSTEM
Revision: 2004 November 2004 FX35/FX45
Removal and Installation AKS00816
VK45DE ENGINE MODELS
Removal
1. Disconnect negative battery cable.
2. Remove engine front undercover, using power tools.
3. Remove cooling fan lower shroud. Refer to CO-39, "
RADIATOR" in “ENGINE COOLING SYSTEM (CO)”
section.
4. Remove alternator, water pump and A/C compressor belt. Refer to EM-169, "
Removal and Installation" in
“ENGINE MECHANICAL (EM)” section.
5. Remove alternator mounting bolts, using power tools.
6. Disconnect alternator connector.
7. Remove B terminal nut.
8. Remove alternator ground harness mounting bolt.
9. Remove alternator assembly to the direction of under side the
vehicle.
1. Alternator ground harness mounting bolt 2. B terminal nut 3. Alternator B terminal harness
4. Alternator Nut 5. Alternator bracket 6. Alternator connector
7. Alternator 8. Alternator mounting bolt 9. Alternator stay
10. Alternator mounting bolt 11. Alternator stay mounting bolt 12. Alternator ground harness
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PKIA2954E
PKIA2820E

CHARGING SYSTEM
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Revision: 2004 November 2004 FX35/FX45
Installation
Note the following, and install in the reverse order of removal.

Install alternator, and check tension of belt. Refer to EM-169, "Checking Drive Belts" in “ENGINE
MECHANICAL (EM)” section.
CAUTION:
Be sure to tighten B terminal nut carefully.
VQ35DE ENGINE MODELS
Removal
1. Disconnect negative battery cable.
2. Remove engine front undercover, using power tools.
3. Remove alternator and power steering belt. Refer to EM-16, "
Removal and Installation" in “ENGINE
MECHANICAL (EM)” section.
4. Disconnect alternator connector.
5. Remove B terminal nut.
6. Remove harness clip and water hose bracket from alternator.
1. B terminal nut 2. Alternator B terminal harness 3. Alternator connector
4. Alternator mounting bolt 5. Alternator stay mounting bolt 6. Alternator stay
7. Alternator
PKIA2821E
PKIA2358E

SC-36
CHARGING SYSTEM
Revision: 2004 November 2004 FX35/FX45
7. Remove oil pressure switch harness clip from alternator stay.
(2WD)
8. Disconnect oil pressure switch connector. (2WD)
9. Remove alternator stay mounting bolts and alternator stay, using
power tools.
10. Remove alternator mounting bolt, using power tools.
11. Remove alternator assembly to the direction of under side the vehicle.
Installation
Note the following, and install in the reverse order of removal.

Install alternator, and check tension of belt. Refer to EM-15, "Checking Drive Belts" in “ENGINE
MECHANICAL (EM)” section.
CAUTION:
Be sure to tighten B terminal nut carefully.
PKIA1923E