Infiniti M35/M45 Y50. Manual - part 739

VIAS

EC-1429

[VK45DE]

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EC

VIAS

PFP:14956

Description

NBS005PK

SYSTEM DESCRIPTION

*: The ECM determines the start signal status by the signals of engine speed and battery voltage.

When the engine is running at low or medium speed, the power valve is fully closed. Under this condition, the
effective suction port length is equivalent to the total length of the intake manifold collector's suction port
including the intake valve. This long suction port provides increased air intake which results in improved suc-
tion efficiency and higher torque generation.
The surge tank and one-way valve are provided. When engine is running at high speed, the ECM sends the
signal to the VIAS control solenoid valve. This signal introduces the intake manifold vacuum into the power
valve actuator and therefore opens the power valve to two suction passages together in the collector.
Under this condition, the effective port length is equivalent to the length of the suction port provided indepen-
dently for each cylinder. This shortened port length results in enhanced engine output with reduced suction
resistance under high speeds.
The power valve is always open regardless of the engine speed when gear position is in N or P.

Sensor

Input signal to ECM

ECM function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

VIAS control

VIAS control solenoid valve

Mass air flow sensor

Amount of intake air

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Battery

Battery voltage*

Engine coolant temperature sensor

Engine coolant temperature

PBIB1876E

EC-1430

[VK45DE]

VIAS

COMPONENT DESCRIPTION
Power Valve

The power valve is installed in intake manifold collector and used to
control the suction passage of the variable induction air control sys-
tem. It is set in the fully closed or fully opened position by the power
valve actuator (1) operated by the vacuum stored in the surge tank.
The vacuum in the surge tank is controlled by the VIAS control sole-
noid valve.

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: Vehicle front

VIAS Control Solenoid Valve

The VIAS control solenoid valve (1) cuts the intake manifold vacuum
signal for power valve actuator. It responds to ON/OFF signals from
the ECM. When the solenoid is off, the vacuum signal from the
intake manifold is cut. When the ECM sends an ON signal the coil
pulls the plunger downward and feeds the vacuum signal to the
power valve actuator.

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: Vehicle front

CONSULT-II Reference Value in Data Monitor Mode

NBS005PL

PBIB2695E

PBIB2694E

MONITOR ITEM

CONDITION

SPECIFICATION

VIAS S/V

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Selector lever: P or N

ON

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Engine speed: More than 5,000 rpm

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Selector lever: Except P or N

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Engine speed: Less than 5,000 rpm

OFF

VIAS

EC-1431

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EC

Wiring Diagram

NBS005PM

TBWT1060E

EC-1432

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VIAS

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

29

V

VIAS control solenoid valve

[Engine is running]

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Selector lever: P or N

0 - 1.0V

[Engine is running]

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Selector lever: D

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Engine speed: Below 5,000 rpm

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

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Engine speed: Above 5,000 rpm

0 - 1.0V

111

SB

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch: OFF]

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For a few seconds after turning ignition 
switch OFF

0 - 1.5V

[Ignition switch: OFF]

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More than a few seconds after turning igni-
tion switch OFF

BATTERY VOLTAGE
(11 - 14V)

119

120

R
R

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)