2007 INFINITI M35 Starter

PG-18
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
Revision: 2007 April2007 M35/M45
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
PFP:284B7
System DescriptionNKS004E2

IPDM E/R (Intelligent Power Distribution Module Engine Room) integrates the relay box and fuse block
which were originally placed in engine compartment. It controls integrated relay via IPDM E/R control cir-
cuit.

IPDM E/R-integrated control circuit performs ON-OFF operation of relay, CAN communication control and
oil pressure switch signal reception, etc.

It controls operation of each electrical part via ECM, BCM and CAN communication lines.
CAUTION:
None of the IPDM E/R-integrated relays can be removed.
SYSTEMS CONTROLLED BY IPDM E/R
1. Lamp control
Using CAN communication, it receives signal from BCM and controls the following lamps:

Headlamps (HI, LO)

Tail, parking and license plate lamps

Front fog lamps
2. Daytime light relay control (for Canada models)
Using CAN communication, it receives signals from BCM and controls the daytime light relay.
3. Wiper control
Using CAN communication, it receives signals from BCM and controls the front wipers.
4. Rear window defogger relay control
Using CAN communication, it receives signals from BCM and controls the rear window defogger relay.
5. A/C compressor control
Using CAN communication, it receives signals from ECM and controls the A/C relay.
6. Cooling fan control
Using CAN communication, it receives signals from ECM and controls cooling fan via cooling fan control
module.
7. Horn control
Using CAN communication, it receives signals from BCM and controls horn relay.
8. Starter motor relay control
Using CAN communication, it receives signals from BCM and controls starter motor relay.
9. Alternator control
Using CAN communication, it receives signal from ECM and controls power generation voltage.
CAN COMMUNICATION LINE CONTROL
With CAN communication, by connecting each control unit using two communication lines (CAN L-line, CAN
H-line), it is possible to transmit maximum amount of information with minimum wiring. Each control unit can
transmit and receive data, and reads necessary information only.
1. Fail-safe control

When CAN communication with other control units is impossible, IPDM E/R performs fail-safe control.
After CAN communication recovers normally, it also returns to normal control.

Operation of control parts by IPDM E/R during fail-safe mode is as follows:
Controlled system Fail-safe mode
Headlamps

With the ignition switch ON, the headlamp low relay is ON.

With the ignition switch OFF, the headlamp low relay is OFF.
Tail, parking and
license plate lamps

With the ignition switch ON, the tail lamp relay is ON.

With the ignition switch OFF, the tail lamp relay is OFF.
Cooling fan

With the ignition switch ON, the cooling fan HI operates.

With the ignition switch OFF, the cooling fan stops.
Front wiperUntil the ignition switch is turned off, the front wiper LO and HI remains in the same status it was in just
before fail−safe control was initiated.

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
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DATA MONITOR
Operation Procedure
1. Touch “DATA MONITOR” on “SELECT MONITOR ITEM ” screen.
2. Touch “ALL SIGNALS”, “MAIN SIGNALS” or “SELECTION FROM MENU” on the “DATA MONITOR”
screen.
3. Touch the required monitoring item on “SELECTION FROM MENU”. In “ALL SIGNALS”, all items are
monitored. In “MAIN SIGNALS”, predetermined items are monitored.
4. Touch “START”.
5. Touch “RECORD” while monitoring to record the status of the item being monitored. To stop recording,
touch “STOP”.
All Signals, Main Signals, Selection From Menu
NOTE:

Perform monitoring of IPDM E/R data with the ignition switch ON. When the ignition switch is at ACC, the display may not be cor-
rect.

*1: Only the vehicle with day time light system operates. ALL SIGNALS All items will be monitored.
MAIN SIGNALS Monitor the predetermined item.
SELECTION FROM MENU Select any item for monitoring.
Item nameCONSULT-II
screen displayDisplay or unitMonitor item selection
Description
ALL
SIGNALSMAIN
SIGNALSSELECTION
FROM
MENU
Motor fan request MOTOR FAN REQ 1/2/3/4×× ×Signal status input from ECM
A/C Compressor
requestAC COMP REQ ON/OFF×× ×Signal status input from ECM
Tail & clearance
requestTAIL&CLR REQ ON/OFF×× ×Signal status input from BCM
Headlamp LO
requestHL LO REQ ON/OFF×× ×Signal status input from BCM
Headlamp HI
requestHL HI REQ ON/OFF×× ×Signal status input from BCM
Front fog lamp
request FR FOG REQ ON/OFF×× ×Signal status input from BCM
Front wiper request FR WIP REQSTOP/1LOW/
LOW/HI×× ×Signal status input from BCM
Wiper auto stop WIP AUTO STOP ACT P/STOP P×× ×Output status of IPDM E/R
Wiper protection WIP PROT OFF/BLOCK×× ×Control status of IPDM E/R
Starter request ST RLY REQ ON/OFF××Signal status input from BCM
Ignition relay status IGN RLY ON/OFF×× ×Ignition relay status monitored
with IPDM E/R
Rear window defog-
ger requestRR DEF REQ ON/OFF×× ×Signal status input from BCM
Oil pressure switch OIL P SW OPEN/CLOSE××Signal status input in IPDM E/R
Daytime running
light requestDTRL REQ
*1ON/OFF××Signal status input from BCM
Hood switch HOOD SW ON/OFF××Signal status input in IPDM E/R
Theft warning horn
requestTHFT HRN REQ ON/OFF××Signal status input from BCM
Horn chirp HORN CHIRP ON/OFF××Output status of IPDM E/R

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STARTING & CHARGING SYSTEM
K ELECTRICAL
CONTENTS
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STARTING & CHARGING SYSTEM
PRECAUTIONS .......................................................... 2
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 2
Precautions for Power Generation Voltage Variable
Control System ......................................................... 2
PREPARATION ........................................................... 3
Special Service Tools ............................................... 3
Commercial Service Tools ........................................ 3
BATTERY .................................................................... 4
How to Handle Battery ............................................. 4
METHODS OF PREVENTING OVER-DIS-
CHARGE ............................................................... 4
CHECKING ELECTROLYTE LEVEL .................... 5
SPECIFIC GRAVITY CHECK ............................... 5
CHARGING THE BATTERY ................................. 6
Trouble Diagnosis with Battery Service Center ........ 7
Removal and Installation .......................................... 7
REMOVAL ............................................................. 7
INSTALLATION ..................................................... 7
STARTING SYSTEM .................................................. 8
System Description .................................................. 8
Wiring Diagram — START — ................................... 9
VQ35DE ENGINE MODELS ................................. 9
VK45DE ENGINE MODELS ............................... 10
Trouble Diagnosis with Starting/Charging System
Tester (Starting) ....................................................... 11
DIAGNOSTIC PROCEDURE 1 ........................... 12
DIAGNOSTIC PROCEDURE 2 ........................... 13
MINIMUM SPECIFICATION OF CRANKING
VOLTAGE REFERENCING COOLANT TEM-
PERATURE ......................................................... 13
Removal and Installation ........................................ 14
VQ35DE ENGINE MODELS (2WD) .................... 14
VQ35DE ENGINE MODELS (AWD) ................... 15
VK45DE ENGINE MODELS ............................... 16Disassembly and Assembly .................................... 17
VQ35DE ENGINE MODELS (2WD) .................... 17
VQ35DE ENGINE MODELS (AWD) .................... 18
VK45DE ENGINE MODELS ................................ 19
Inspection After Disassembly ................................. 19
PINION/CLUTCH CHECK ................................... 19
CHARGING SYSTEM ............................................... 20
System Description ................................................. 20
DESCRIPTION .................................................... 20
MALFUNCTION INDICATOR .............................. 20
POWER GENERATION VOLTAGE VARIABLE
CONTROL SYSTEM ........................................... 21
Wiring Diagram — CHARGE — ............................. 22
VQ35DE ENGINE MODELS (2WD) .................... 22
VQ35DE ENGINE MODELS (AWD) .................... 23
VK45DE ENGINE MODELS ................................ 24
Trouble Diagnosis with Starting/Charging System
Tester (Charging) .................................................... 25
PRELIMINARY INSPECTION ............................. 26
DIAGNOSTIC PROCEDURE 1 ........................... 26
DIAGNOSTIC PROCEDURE 2 ........................... 27
DIAGNOSTIC PROCEDURE 3 ........................... 27
DIAGNOSTIC PROCEDURE 4 ........................... 28
Power Generation Voltage Variable Control System
Operation Inspection .............................................. 29
Removal and Installation ........................................ 31
VQ35DE ENGINE MODELS ............................... 31
VK45DE ENGINE MODELS ................................ 33
Disassembly and Assembly .................................... 35
VQ35DE ENGINE MODELS ............................... 35
VK45DE ENGINE MODELS ................................ 36
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 37
Battery .................................................................... 37
Starter ..................................................................... 37
Alternator ................................................................ 37

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STARTING SYSTEM
Revision: 2007 April2007 M35/M45
STARTING SYSTEMPFP:23300
System Description NKS005C2
Power is supplied at all times

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

to CPU of IPDM E/R,

through 15A fuse (No. 71, located in the IPDM E/R)

to CPU of IPDM E/R.
Ground is supplied

to IPDM E/R terminals 38 and 51

from grounds E22 and E43.
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.
And then provided that IPDM E/R receives a starter relay ON signal with CAN communication, starter relay is
energized.
With the ignition switch in the START position, power is supplied

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.

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STARTING SYSTEM
Revision: 2007 April2007 M35/M45
DIAGNOSTIC PROCEDURE 1
Check “B” Terminal Circuit
CAUTION:
Perform diagnosis under the condition that engine cannot start by the following procedure.
1. Remove fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is released.
1. CHECK “B” TERMINAL CIRCUIT
1. Turn ignition switch OFF.
2. Make sure that starter motor “B” terminal connection is clean
and tight.
3. Check voltage between starter motor “B” terminal and ground.
OK or NG
OK >> GO TO 2.
NG >> Check harness between battery and starter motor for open circuit.
2. CHECK BATTERY CABLE CONNECTION STATUS (VOLTAGE DROP TEST)
Check voltage between starter motor “B” terminal and battery posi-
tive terminal.
OK or NG
OK >> GO TO 3.
NG >> Check harness between the battery and the starter motor for poor continuity.
*1 For battery testing, use Battery Ser-
vice Center (J-48087). For details
and operating instructions, refer to
Technical Service Bulletin and/or
Battery Service Center User Guide.*2SC-13, "MINIMUM SPECIFICATION
OF CRANKING VOLTAGE REFER-
ENCING COOLANT TEMPERA-
TURE"
*3SC-12, "Check “B” Terminal Circuit"
*4SC-13, "Check “S” Connector Cir-
cuit"
Te r m i n a l s
Voltage (Approx.) (+)
(–)
Starter motor
“B” terminalTerminal
E203 2 Ground Battery voltage
PKIB8793E
Terminals
ConditionVoltage
(Approx.)
(+)(–)
Starter motor
“B” terminalTerminal
Battery positive
terminalE203 2 When the ignition
switch is in
START positionLess than
0.5 V
PKIB8794E

STARTING SYSTEM
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3. CHECK GROUND CIRCUIT STATUS (VOLTAGE DROP TEST)
1. Turn ignition switch OFF.
2. Check voltage between starter motor case and battery negative
terminal.
OK or NG
OK >> “B” terminal circuit is OK. Further inspection necessary.
Refer to SC-11, "
Trouble Diagnosis with Starting/Charging System Tester (Starting)" .
NG >> Check the starter motor case and ground for poor continuity.
DIAGNOSTIC PROCEDURE 2
Check “S” Connector Circuit
CAUTION:
Perform diagnosis under the condition that engine cannot start by the following procedure.
1. Remove fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is released.
1. CHECK “S” CONNECTOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect starter motor connector.
3. Check voltage between starter motor harness connector and
ground.
OK or NG
OK >> “S” connector circuit is OK. Further inspection necessary. Refer to SC-11, "Trouble Diagnosis with
Starting/Charging System Tester (Starting)" .
NG >> Check the following.

Ignition switch and PDU

IPDM E/R

Harness between starter motor and IPDM E/R
MINIMUM SPECIFICATION OF CRANKING VOLTAGE REFERENCING COOLANT TEMPERA-
TURE
Terminals
Condition Voltage (Approx.)
(+) (–)
Starter motor
caseBattery negative
terminalWhen the ignition
switch is in
START positionLess than 0.2 V
PKIB8795E
Terminals
ConditionVoltage
(Approx.) (+)
(–)
Starter motor
connectorTerminal
F9 (VQ35DE)
E210 (VK45DE)1 GroundWhen the ignition
switch is in
START positionBattery voltage
PKIB8796E
Engine coolant temperature Voltage [V]
−30 °C to −20 °C (−22 °F to −4 °F) 8.6
−19 °C to −10 °C (−2 °F to 14°F) 9.1
−9 °C to 0 °C (16 °F to 32 °F) 9.5
More than 1 °C (More than 34 °F) 9.9

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STARTING SYSTEM
Revision: 2007 April2007 M35/M45
Removal and Installation NKS005BU
VQ35DE ENGINE MODELS (2WD)
Removal
1. Disconnect the battery cable from the negative terminal.
2. Remove engine front and rear undercover, using power tools.
3. Remove “B” terminal nut (1).
4. Disconnect “S” connector (2).
5. Remove starter motor mounting bolts (A), using power tools.
6. Remove starter motor downward from the vehicle.
Installation
Installation is 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 : N·m (kg-m, ft-lb) : N·m (kg-m, in-lb)
: Engine front
PKIB8799E
PKIB8800E

STARTING SYSTEM
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VQ35DE ENGINE MODELS (AWD)
Removal
1. Disconnect the battery cable from the negative terminal.
2. Remove engine rear undercover, using power tools.
3. Remove exhaust mounting bracket. Refer to EM-28, "
Removal and Installation" .
4. Remove “B” terminal nut (1).
5. Disconnect “S” connector (1).
6. Remove starter motor mounting bolts (A) and harness bracket
(2), using power tools.
7. Remove starter motor downward from the vehicle.
Installation
Installation is 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
: N·m (kg-m, ft-lb) : Engine front
PKIB8801E
PKIB8802E
PKIB8803E