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STARTING SYSTEM
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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
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Wiring Diagram — START — NKS005C3
VQ35DE ENGINE MODELS
TKWT3232E
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STARTING SYSTEM
Revision: 2007 April2007 M35/M45
VK45DE ENGINE MODELS
TKWT3233E
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STARTING SYSTEM
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Trouble Diagnosis with Starting/Charging System Tester (Starting)NKS005BT
For starting system testing, use Starting/Charging System Tester (J-44373). For details and operating instruc-
tions, refer to Technical Service Bulletin.
SKIB1369E
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STARTING SYSTEM
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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
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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
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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
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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