Name: Toyota 3VZ–FE
Brand: Toyota
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IAC Valve Circuit

CIRCUIT DESCRIPTION

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The IAC valve is provided on the intake air chamber

and intake air bypassing the throttle valve is di-

rected to the IAC valve through a hose.

A step motor is built into the IAC valve. It consists of

four coils, the magnetic rotor, valve shaft and

valve.When current flows to the coils due to signals

from the ECM, the rotor turns and moves the valve

shaft forward or backward, changing the clearance

between the valve and the valve seat.

In this way the intake air volume bypassing the

throttle valve is regulated, controlling the engine

speed.There are 125 possible positions to which the

valve can be opened.

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Reference: INSPECTION USING OSCILLOSCOPE

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IAC SIGNAL WAVEFORM

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 With the engine idling measure between terminals

ISC1, ISC2, ISC3, ISC4 abd E01 of ECM when A/C

switch ON or OFF.

HINT:

The correct waveform appears as shown in the il-

lustration on the left.

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EG–436

–ENGINE TROUBLESHOOTING CIRCUIT INSPECTION

Brand

Toyota

Model

3VZ–FE

Toyota 3VZ–FE User Manual

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Toyota 3VZ–FE Specifications

Related product manuals

Brand	Toyota
Model	3VZ–FE
Category	Engine
Language	English