IdleT

13 Янв 2015 | Author: | No comments yet »

Toyota Idle Air Control

The rotary solenoid (RS) IAC valve is located on the throttle and intake air bypassing the throttle passes through it.

In this way the air volume bypassing the throttle is regulated, controlling the engine

The ECM operates only the IAC valve to idle-up and provide feedback for the idling speed. The IACV its power from the EFI relay and through the ECM. There are two of rotary solenoid IACVs. The style uses two driver one driver for each coil. The style uses a single circuit, one coil is controlled by the ECM the other coil is always They are not interchangeable. An easy way to which type of rotary is to use the wiring schematic. The older has tw o wires connected to the ECM while the type has one connected to the ECM and the other connected to ground.

Rotary IACV Operation .

The assembly consists of two electrical a permanent magnet mounted on the shaft, and a valve. A fail-sa fe strip is fitted to the end of the shaft to the valve in the event of electrical in the IACV system. Located at the end of the shaft, the cylindrical permanent rotates when its two poles are by the magnetism exerted by coils T1 and T2. to the midsection of the valve shaft, the controls the amount of air passing the bypass port. The valve, shaft, and permanent magnet all together.

Strip As shown, each is connected to a transistor, T1 and T2 located in the When transistor T1 turns on, flows through that The magnetic field of the coil and the field of the permanent magnet the valve to rotate clockwise. T2 is turned on, the valve rotates

The ECM varies the on time (duty for each coil. The difference in between the two magnetic fields the position of the valve. The frequency is high, 250Hz. This frequency helps the valve the correct position for proper

Single Driver Rotary Operation.

The difference with type of IACV is that the ECM a duty cycle signal to one inside the IACV; the other is always on. To change the IACV ECM changes the duty ratio in the coil.

Bimetallic Spring .

Toyota RSC

If the electrical connector is disconnected or the fails electrically, the shaft rotate to a position determined by the of the permanent magnet with the core of the coils and the bi-metal The cold idle will not be as as normal and the warm idle be higher than normal. a bimetallic strip allows the to change airflow rate the change in temperature. The default rpm is 1000 to 1200 RPM once the has reached normal operating

Rotary IACV Controlled

Engine Starting . As the engine is the ECM opens the IACV to a preprogrammed based on coolant temperature and rpm.

Warm-up . Once the has started, the ECM controls the fast based on coolant temperature.


As the engine approaches normal temperature, engine speed is reduced. At this time the ECM is actual idle rpm to the target

Engine Load/Speed Change Control. To prevent major from changing engine significantly, the ECM monitors signals the neutral start switch the air conditioner switch (A/C), or rear window defogger and in models equipped with steering, an oil pressure switch By monitoring these inputs, the ECM target idle speeds and adjusts IACV position.

Toyota RSC
Toyota RSC
Toyota RSC
Toyota RSC

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