Infiniti M45 (Y34). Manual — part 488
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
EC-641
C
D
E
F
G
H
I
J
K
L
M
A
EC
VARIABLE INDUCTION AIR CONTROL SYSTEM (VIAS)
PFP:14956
Description
ABS002TF
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 selector lever 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
PBIB0035E
EC-642
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
ABS002TG
PBIB0035E
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-643
C
D
E
F
G
H
I
J
K
L
M
A
EC
Wiring Diagram
ABS002TH
TBWA0304E
EC-644
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
ABS002TI
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 selector lever 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: Above 5,000 rpm
0 - 1.0V
PBIB0171E
PBIB0172E
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст