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HOMESERVICE MANUALSNISSAN-DATSUN2009XTERRA SE, 4WDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - INTRODUCTIONFUNCTION DIAGNOSISVARIABLE INDUCTION AIR SYSTEMDESCRIPTIONSYSTEM DESCRIPTION
2009 Nissan-Datsun Xterra SE, 4WD

System Description

2009 Nissan-Datsun Xterra SE, 4WDSECTION System Description
ECM FUNCTION CHART

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(1)
(1) ECM determines the start signal status by the signals of engine speed and battery voltage.
Fig 1: Variable Induction Air System Diagram
G04897439Courtesy of NISSAN MOTOR CO., U.S.A.

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 passage 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 shortened intake manifold length results in enhanced engine output due to reduced suction resistance under high speeds.

RENDER: 1.0x

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