Infiniti F50. Manual - part 498

 

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Infiniti F50. Manual - part 498

 

 

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

EC-633

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VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

PFP:14956

Description

EBS00MNQ

SYSTEM DESCRIPTION

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”.

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 operated by the vacuum stored in the surge tank. The
vacuum in the surge tank is controlled by the VIAS control solenoid
valve.

Sensor

Input Signal to ECM

ECM function

Actuator

Mass air flow sensor

Amount of intake air

VIAS control

VIAS control solenoid valve

Throttle position sensor

Throttle position

Accelerator pedal position sensor

Accelerator pedal position

Ignition switch

Start signal

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

Engine speed

Engine coolant temperature sensor

Engine coolant temperature

PBIB1876E

PBIB1253E

EC-634

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

VIAS Control Solenoid Valve

The VIAS control solenoid valve cuts the intake manifold vacuum
signal for power valve control. 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.

CONSULT-II Reference Value in Data Monitor Mode

EBS00MNR

PBIB1253E

MONITOR ITEM

CONDITION

SPECIFICATION

VIAS S/V

Engine speed: Idle

Selector lever: “P” or “N”
Engine speed: More than 5,000 rpm

ON

Except above

OFF

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

EC-635

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Wiring Diagram

EBS00MNS

TBWM0171E

EC-636

VARIABLE INDUCTION AIR CONTROL SYSTEM (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.

Diagnostic Procedure

EBS00MNT

1. 

CHECK OVERALL FUNCTION

 With CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Perform “VIAS SOL VALVE” in “ACTIVE TEST” mode with CONSULT-II.

3.

Turn VIAS control solenoid valve “ON” and “OFF”, and make sure that power valve actuator rod moves.

 Without CONSULT-II

1.

Lift up the vehicle.

2.

Start engine and warm it up to normal operating temperature.

3.

Make sure that power valve actuator rod moves when changing
the gear position to “N” and “D” alternately.

OK or NG

OK

>> INSPECTION END

NG (With CONSULT-II)>>GO TO 2.
NG (Without CONSULT-II)>>GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

27

PU

VIAS control solenoid 
valve

[Engine is running]

Selector lever: “P” or “N”

0 - 1.0V

[Engine is running]

Selector lever: “D”

BATTERY VOLTAGE
(11 - 14V)

[Engine is running]

Engine speed is above 5,000 rpm

0 - 1.0V

PBIB1255E

PBIB1254E

 

 

 

 

 

 

 

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