Infiniti FX35 / FX45. Manual - part 606

SNOW MODE SWITCH

EC-1185

< SERVICE INFORMATION >

[VK45DE]

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EC

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4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 9.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

7.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten three ground screws on the body.
Refer to 

EC-723, "Ground Inspection"

.

OK or NG

OK

>> GO TO 8.

NG

>> Repair or replace ground connections.

8.

CHECK SNOW MODE INDICATOR LAMP GROUND CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between snow mode switch terminal 2 and ground.
Refer to Wiring Diagram.

2.

Also check harness for short to power.

OK or NG

OK

>> GO TO 9.

NG

>> Repair open circuit or short to power in harness or connectors.

9.

CHECK SNOW MODE SWITCH

Refer to 

EC-1185, "Component Inspection"

.

OK or NG

OK

>> GO TO 10.

NG

>> Replace snow mode switch.

10.

CHECK INTERMITTENT INCIDENT

Refer to 

EC-717

.

>> INSPECTION END

Component Inspection

INFOID:0000000001327081

SNOW MODE SWITCH

PBIB2195E

Continuity should exist.

EC-1186

< SERVICE INFORMATION >

[VK45DE]

SNOW MODE SWITCH

1.

Check continuity between snow mode switch terminals 1 and 4
under the following conditions.

2.

If NG, replace snow mode switch.
If OK, go to following step.

3.

Check continuity between snow mode switch terminals 2 and 4
under the following conditions.

4.

If NG, replace snow mode switch.

CONDITION

CONTINUITY

Snow mode switch: ON

Should exist

Snow mode switch: OFF

Should not exist

PBIB2563E

CONDITION

CONTINUITY

1

Should exist

2

Should not exist

PBIB2564E

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

EC-1187

< SERVICE INFORMATION >

[VK45DE]

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VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

Description

INFOID:0000000001327082

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 isfully closed. Under this condition, the
effective suction port length is equivalentto the total length of the intake manifold collector's suction port includ-
ingthe intake valve. This long suction port provides increased air intake whichresults in improved suction effi-
ciency and higher torque generation.
The surge tank and one-way valve are provided. When engine is runningat high speed, the ECM sends the
signal to the VIAS control solenoid valve.This signal introduces the intake manifold vacuum into the power
valve actuatorand therefore opens the power valve to two suction passages together in thecollector.
Under this condition, the effective port length is equivalent to thelength of the suction port provided indepen-
dently for each cylinder. Thisshortened port length results in enhanced engine output with reduced suctionre-
sistance 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

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-1188

< SERVICE INFORMATION >

[VK45DE]

VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)

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.
•

: Vehicle front

VIAS Control Solenoid Valve

The VIAS control solenoid valve (1) 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.
• Vacuum tank (2)

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001327083

PBIB3237E

PBIB3236E

MONITOR ITEM

CONDITION

SPECIFICATION

VIAS S/V

• Selector lever: P or N

ON

• Engine speed: More than 5,000 rpm

• Selector lever: Except P or N
• Engine speed: Less than 5,000 rpm

OFF