alternator INFINITI M35 2007 Factory Owner's Manual

CHARGING SYSTEM
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Revision: 2007 April2007 M35/M45
POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM
Power generation voltage variable control system that controls the power generation voltage of the alternator
has been adopted. By performing the power generation voltage variable control, the engine load due to the
power generation of the alternator is reduced and fuel consumption is decreased.
Operation Description

The battery current sensor detects the charging/discharging current of the battery. ECM judges the battery
condition based on this signal.

ECM judges whether to perform the power generation voltage variable control according to the battery
condition.

When performing the power generation voltage variable control, ECM calculates the target power genera-
tion voltage according to the battery condition and sends the calculated value as the power generation
command value to IPDM E/R.

IPDM E/R converts the received power generation command value into the power generation command
signal (PWM signal) and sends it to the IC regulator.

The IC regulator controls the power generation voltage by the target power generation voltage based on
the received power generation command signal.

When there is no power generation command signal, the alternator performs the normal power generation
according to the characteristic of the IC regulator.
NOTE:
When any malfunction is detected in the power generation voltage variable control system, the power genera-
tion is performed according to the characteristic of the IC regulator of the alternator.
Main Component Part
BATTERY CURRENT SENSOR

Battery current sensor (1) is installed to the battery cable at the
negative terminal, and it detects the charging/discharging cur-
rent of the battery and sends the voltage signal to ECM accord-
ing to the current value.
SKIB5009E
PKIB8806E

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Revision: 2007 April2007 M35/M45
PRELIMINARY INSPECTION
1. CHECK BATTERY TERMINALS CONNECTION
Check if battery terminals is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair battery terminals connection.
2. CHECK FUSE AND FUSIBLE LINK
Check for blown fuse and fusible link.
OK or NG
OK >> GO TO 3.
NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse.
3. CHECK “E” TERMINAL CONNECTION
Check if “E” terminal (alternator ground harness) is clean and tight.
OK or NG
OK >> GO TO 4.
NG >> Repair “E” terminal connection.
4. CHECK ALTERNATOR DRIVE BELT TENSION
Check alternator drive belt tension. Refer to the following.

VQ35DE: EM-17, "Removal and Installation"

VK45DE: EM-174, "Removal and Installation"
OK or NG
OK >> INSPECTION END
NG >> Repair as needed.
DIAGNOSTIC PROCEDURE 1
Check “L” Terminal Circuit (Open)
1. CHECK “L” TERMINAL CONNECTION
1. Turn ignition switch OFF.
2. Check if “L” terminal is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair “L” terminal connection. Confirm repair by performing complete Starting/Charging system
test. Refer to Technical Service Bulletin.
*1SC-26, "Check “L” Terminal Circuit
(Open)"
*2SC-27, "Check “L” Terminal Circuit
(Short)"
*3SC-27, "Check “S” Terminal Circuit"
*4SC-28, "Check “B” Terminal Circuit"*5SC-32, "Alternator Pulley Inspec-
tion" (VQ35DE)
SC-34, "
Alternator Pulley Inspec-
tion" (VK45DE)
Unit Power source (Power supply terminals) Fuse and fusible link No.
Alternator Battery (“S” terminal) 36
Combination meter Ignition switch ON (“L” terminal) 14

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2. CHECK “L” TERMINAL CIRCUIT (OPEN)
1. Disconnect alternator connector.
2. Apply ground to alternator harness connector terminal.
3. Check condition the charge warning lamp with the ignition
switch in the ON position.
OK or NG
OK >> Go to SC-25, "Trouble Diagnosis with Starting/Charging System Tester (Charging)" .
NG >> Check the following.

Harness for open between combination meter and alternator

Harness for open between combination meter and fuse

Charge warning lamp (Combination meter)
DIAGNOSTIC PROCEDURE 2
Check “L” Terminal Circuit (Short)
1. CHECK “L” TERMINAL CIRCUIT (SHORT)
1. Turn ignition switch OFF.
2. Disconnect alternator connector.
3. Turn ignition switch ON.
Charge warning lamp should illuminate?
YES >> Check the following.

Harness for short between combination meter and alternator

Charge warning lamp (Combination meter)
NO >> Go to SC-25, "
Trouble Diagnosis with Starting/Charging System Tester (Charging)" .
DIAGNOSTIC PROCEDURE 3
Check “S” Terminal Circuit
1. CHECK “S” TERMINAL CONNECTION
1. Turn ignition switch OFF.
2. Check if “S” terminal is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair “S” terminal connection. Confirm repair by performing complete Starting/Charging system
test. Refer to Technical Service Bulletin.
Alternator
connectorTerminal
GroundCondition
Ignition switch
positionCharge warning
lamp
F20 (VQ35DE)
E209 (VK45DE)3 ON illuminate
PKIB8807E

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2. CHECK “S” TERMINAL CIRCUIT
1. Disconnect alternator connector.
2. Check voltage between alternator harness connector and
ground.
OK or NG
OK >> Go to SC-25, "Trouble Diagnosis with Starting/Charging
System Tester (Charging)" .
NG >> Check harness for open between alternator and fuse.
DIAGNOSTIC PROCEDURE 4
Check “B” Terminal Circuit
1. CHECK “B” TERMINAL CONNECTION
1. Turn ignition switch OFF.
2. Check if “B” terminal is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair “B” terminal connection. Confirm repair by performing complete Starting/Charging system
test. Refer to Technical Service Bulletin.
2. CHECK “B” TERMINAL CIRCUIT
Check voltage between alternator “B” terminal and ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open between alternator and fusible
link.
Terminals
Voltage (Approx.) (+)
(–)
Alternator connector Terminal
F20 (VQ35DE)
E209 (VK45DE)4 Ground Battery voltage
PKIB8808E
Terminals
Voltage (Approx.) (+)
(–)
Alternator “B” terminal Terminal
E205 [VQ35DE (2WD)]
E202 [VQ35DE (AWD)/VK45DE]1 Ground Battery voltage
PKIB8809E

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3. CHECK “B” TERMINAL CONNECTION (VOLTAGE DROP TEST)
1. Start engine, then engine running at idle and warm.
2. Check voltage between battery positive terminal and alternator
“B” terminal.
OK or NG
OK >> Go to SC-25, "Trouble Diagnosis with Starting/Charging
System Tester (Charging)" .
NG >> Check harness between battery and alternator for poor continuity.
Power Generation Voltage Variable Control System Operation InspectionNKS003NQ
CAUTION:

For this model, the battery current sensor that is installed to the battery cable at the negative ter-
minal measures the charging/discharging current of the battery, and performs various controls. If
the electrical component or the ground wire is connected directly to the battery terminal, the cur-
rent other than that being measured with the battery current sensor is charging to or discharging
from the battery. This condition causes the malfunction of the control, and then the battery dis-
charge may occur. Never connect the electrical component or the ground wire directly to the bat-
tery terminal.

When performing this inspection, always use the charged battery that completed the battery
inspection. (When the charging rate of the battery is low, the response speed of the voltage
change will become slow. This is a cause of an incorrect inspection.)
INSPECTION PROCEDURE
1. CHECK ECM (CONSULT-II)
Perform ECM self-diagnosis with CONSULT-II. Refer to the following.

VQ35DE: EC-123, "CONSULT-II Function (ENGINE)"

VK45DE: EC-826, "CONSULT-II Function (ENGINE)"
Self-diagnostic results content
No malfunction detected>> GO TO 2.
Malfunction detected>> Check applicable parts, and repair or replace corresponding parts.
Terminals
Voltage
(Approx.)
(+)(–)
Alternator “B” terminal Terminal
Battery positive
terminalE205 [VQ35DE (2WD)]
E202 [VQ35DE (AWD)/VK45DE]1 Less than 0.2 V
PKIB8810E

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Revision: 2007 April2007 M35/M45
2. CHECK OPERATION OF POWER GENERATION VOLTAGE VARIABLE CONTROL SYSTEM
1. Connect CONSULT-II and start the engine.
2. The selector lever is in “P” or “N” position and all of the electric
loads and A/C, etc. are turned OFF.
3. Select “ALTERNATOR DUTY” at “ACTIVE TEST” of “ENGINE”,
and then check the value of “BATTERY VOLT” monitor when
DUTY value of “ALTERNATOR DUTY” is set to 40.0 %.
4. Check the value of “BATTERY VOLT” monitor when DUTY value
of “ALTERNATOR DUTY” is set to 80.0%.
OK or NG
OK >> INSPECTION END
NG >> GO TO 3. (The charging condition of the battery should
be normal.)
3. CHECK IPDM E/R (CONSULT-II)
Perform IPDM E/R self-diagnosis with CONSULT-II. Refer to PG-20, "
CONSULT-II Function (IPDM E/R)" .
Self
-diagnostic results content
No malfunction detected>> GO TO 4.
Malfunction detected>> Check applicable parts, and repair or replace corresponding parts.
4. CHECK HARNESS BETWEEN ALTERNATOR AND IPDM E/R
1. Turn ignition switch OFF.
2. Disconnect alternator connector and IPDM E/R connector.
3. Check continuity between alternator harness connector (A) and
IPDM E/R harness connector (B).
4. Check continuity between alternator harness connector (A) and
ground.
OK or NG
OK >> Replace IPDM E/R.
NG >> Repair harness or connector between IPDM E/R and alternator. “BATTERY VOLT”
2 seconds after setting the
DUTY value of “ALTERNA-
TOR DUTY” to 40.0 %: 12 - 13.6 V
PKIB4503E
“BATTERY VOLT”
20 seconds after setting
the DUTY value of “ALTER-
NATOR DUTY” to 80.0 %: +0.5 V or more against
the value of “BATTERY
VOLT” monitor when
DUTY value is 40.0 %
PKIB4504E
AB
Continuity
Connector Terminal Connector Terminal
F20 (VQ35DE)
E209 (VK45DE)5 E8 33 Yes
A
GroundCondition
Connector Terminal
F20 (VQ35DE)
E209 (VK45DE)5No
PKIB8811E

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Removal and Installation NKS005C0
VQ35DE ENGINE MODELS
Removal (2WD Models)
1. Disconnect the battery cable from the negative terminal.
2. Remove engine front undercover, using power tools.
3. Remove alternator and power steering oil pump belt. Refer to EM-16, "
DRIVE BELTS" .
4. Disconnect alternator connector (1).
5. Remove “B” terminal nut (2).
6. Remove the harness bracket bolts (A).
7. Remove oil pressure switch harness clip (A) from alternator stay.
8. Disconnect oil pressure switch connector (1).
9. Remove alternator mounting bolt (B) and alternator stay mount-
ing bolt (C) using power tools, then remove alternator stay (2).
10. Remove alternator mounting bolt (D), using power tools.
11. Remove alternator assembly downward from the vehicle.
1. “B” terminal nut 2. “B” terminal harness 3. Alternator connector
4. Alternator mounting bolt 5. Alternator stay mounting bolt 6. Alternator stay
7. Alternator : N·m (kg-m, ft-lb) : Engine front
PKIB8815E
SKIB2605J
PKIB8817E

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Revision: 2007 April2007 M35/M45
Removal (AWD Models)
1. Disconnect the battery cable from the negative terminal.
2. Remove power steering oil reservoir tank from the bracket.
3. Remove the clips (A) and the hose clamp (B) from the harness
bracket (1).
4. Remove engine front undercover, using power tools.
5. Remove alternator and power steering oil pump belt. Refer to
EM-16, "
DRIVE BELTS" .
6. Remove alternator mounting bolt (A) and alternator stay mount-
ing bolt (B) using power tools, then remove alternator stay (1).
7. Remove alternator mounting bolt (C), using power tools.
8. Pull and turn alternator, and then remove the harness bracket
bolts (A).
9. Disconnect alternator connector (1).
10. Remove “B” terminal nut (2).
11. Remove alternator assembly downward from the vehicle.
Alternator Pulley Inspection
Perform the following.

Make sure that alternator pulley does not rattle.

Make sure that alternator pulley nut is tight.
Installation
Installation is the reverse order of removal.
CAUTION:
Be sure to tighten “B” terminal nut carefully.

Install alternator, and check tension of belt. Refer to EM-16, "Checking Drive Belts" .

For this model, the power generation voltage variable control system that controls the power generation
voltage of the alternator has been adopted. Therefore, the power generation voltage variable control sys-
tem operation inspection should be performed after replacing the alternator, and then make sure that the
system operates normally. Refer to SC-29, "
Power Generation Voltage Variable Control System Operation
Inspection" .
PKIB8818E
PKIB8819E
SKIB2608J
Alternator pulley nut:
: 118 N·m (12.0 kg-m, 87 ft-lb)

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VK45DE ENGINE MODELS
Removal
1. Disconnect the battery cable from the negative terminal.
2. Remove engine front undercover, using power tools.
3. Remove “B” terminal nut (1).
4. Disconnect alternator connector (2).
5. Remove alternator ground harness mounting bolt (3).
6. Remove the harness bracket bolts (A).
7. Remove air intake duct. Refer to EM-177, "
AIR CLEANER AND AIR DUCT" .
8. Remove alternator, water pump and A/C compressor belt. Refer to EM-174, "
DRIVE BELTS" .
9. Remove power steering oil reservoir tank (1) from the bracket,
engine coolant reservoir tank (2) and vacuum tank (3).
10. Remove the harness clips (A).
11. Remove alternator mounting bolts (B), using power tools.
12. Remove alternator assembly upward.
1. Alternator ground harness 2. “B” terminal nut 3. “B” terminal harness
4. Alternator nut 5. Alternator bracket 6. Alternator
7. Alternator mounting bolt 8. Alternator stay
: N·m (kg-m, in-lb) : N·m (kg-m, ft-lb) : Engine front
PKIB8812E
PKIB8813E
PKIB8814E

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Revision: 2007 April2007 M35/M45
Alternator Pulley Inspection
Perform the following.

Make sure that alternator pulley does not rattle.

Make sure that alternator pulley nut is tight.
Installation
Installation is the reverse order of removal.
CAUTION:
Be sure to tighten “B” terminal nut carefully.

Install alternator, and check tension of belt. Refer to EM-174, "Checking Drive Belts" .

For this model, the power generation voltage variable control system that controls the power generation
voltage of the alternator has been adopted. Therefore, the power generation voltage variable control sys-
tem operation inspection should be performed after replacing the alternator, and then make sure that the
system operates normally. Refer to SC-29, "
Power Generation Voltage Variable Control System Operation
Inspection" . Alternator pulley nut:
: 118 N·m (12.0 kg-m, 87 ft-lb)