Infiniti I35 (A33). Manual — part 334
Description
NHEC0596
SYSTEM DESCRIPTION
NHEC0596S01
Sensor
Input Signal to ECM
ECM func-
tion
Actuator
Mass air flow sensor
Amount of intake air
VIAS con-
trol
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
SEC916C
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 collec-
tor’s suction port including the intake valve. This long suction port
provides increased air intake which results in improved suction
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 con-
trol 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 independently for each cylinder.
This shortened port length results in enhanced engine output with
reduced suction resistance under high speeds.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
Description
EC-677
SEC059D
COMPONENT DESCRIPTION
NHEC0596S02
Power Valve
NHEC0596S0201
The power valve is installed in intake manifold collector and used
to control the suction passage of the variable induction air control
system. 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 con-
trol solenoid valve.
SEC058D
VIAS Control Solenoid Valve
NHEC0596S0202
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.
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
Description (Cont’d)
EC-678
Wiring Diagram
NHEC0597
MEC897D
SEF636XC
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
Wiring Diagram
EC-679
Diagnostic Procedure
NHEC0598
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.
SEC128D
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Rev engine quickly up to above 5,000 rpm and make sure that power valve actuator rod moves.
SEC060D
OK or NG
OK
©
INSPECTION END
NG
©
GO TO 2.
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
Diagnostic Procedure
EC-680
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