Nissan Frontier. Instruction — part 483
TUMBLE CONTROL VALVE CONTROL
EC-503
< SYSTEM DESCRIPTION >
[VQ40DE FOR USA AND CANADA]
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TUMBLE CONTROL VALVE CONTROL
System Description
INFOID:0000000009481202
SYSTEM DIAGRAM
SYSTEM DESCRIPTION
Intake manifold runner control valve has a valve portion in the intake passage of each cylinder.
While idling and during low engine coolant temperature, the intake manifold runner control valve closes. Thus
the velocity of the air in the intake passage increases, promoting the vaporization of the fuel and producing a
intake manifold runner in the combustion chamber.
Because of this operation, this system tends to increase the burning speed of the gas mixture, improve
exhaust emission, and increase the stability in running conditions.
Also, except when idling and during low engine coolant temperature, this system opens the intake manifold
runner control valve.
In this condition, this system tends to increase power by improving intake efficiency via reduction of intake flow
resistance.
The intake manifold runner control valve is operated by the ECM.
JPBIA6226GB
EC-504
< SYSTEM DESCRIPTION >
[VQ40DE FOR USA AND CANADA]
VARIABLE INDUCTION AIR SYSTEM
VARIABLE INDUCTION AIR SYSTEM
Description
INFOID:0000000009481203
SYSTEM DESCRIPTION
*: ECM determines the start signal status by the signals of engine speed and battery voltage.
When the engine is running at medium speed, the ECM sends the ON signal to the VIAS control solenoid
valve. This signal introduces the intake manifold vacuum into the power valve actuator and therefore closes
the power valve.
Under this condition, the effective intake manifold length is equivalent to the total length of passage A and pas-
sage B. This long intake manifold provides increased amount of intake air, which results in improved suction
efficiency and higher torque.
When engine is running at low or high speed, the ECM sends the OFF signal to the VIAS control solenoid
valve and the power valve is opened.
Under this condition, the effective intake manifold length is equivalent to the length of passage B. This short-
ened intake manifold length results in enhanced engine output due to reduced suction resistance under high
speeds.
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
Engine coolant temperature sensor
Engine coolant temperature
Throttle position sensor
Throttle position
Accelerator pedal position sensor
Accelerator pedal position
Battery
Battery voltage*
PBIB1822E
VARIABLE INDUCTION AIR SYSTEM
EC-505
< SYSTEM DESCRIPTION >
[VQ40DE FOR USA AND CANADA]
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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 saved in the surge tank. The
vacuum in the surge tank is controlled by the VIAS control solenoid
valve.
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.
BBIA0569E
BBIA0569E
EC-506
< SYSTEM DESCRIPTION >
[VQ40DE FOR USA AND CANADA]
VARIABLE INDUCTION AIR SYSTEM
Vacuum Hose Drawing
INFOID:0000000009481204
Refer to
for Vacuum Control System.
PBIB2529E
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