nissan Workshop Repair Guides

Nissan and Datsun Workshop Service and Repair Manuals

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Auxiliary Air Control (AAC) Valve <--> [Idle Speed/Throttle Actuator - Electronic]|Specifications|Page 2471 > < Auxiliary Air Control (AAC) Valve <--> [Idle Speed/Throttle Actuator - Electronic]|Specifications|Page 2469

240SX L4-2.4L (KA24DE) (1993)

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Auxiliary Air Control (AAC) Valve: Description and Operation

Idle Speed Control System

CIRCUIT OPERATION

The idle speed is controlled by the amount of air that is allowed to bypass the throttle plate through the auxiliary air control (AAC) valve. The
AAC valve is turned ON and OFF at a rate between 100 and 200 Hz. The ECU calculates the duty cycle (frequency of ON/OFF signals) necessary
to maintain the proper idle speed, compensating for transmission gear position, electrical and accessory loads.

IACV-Auxiliary Air Control Valve

AUXILIARY AIR CONTROL VALVE

Purpose

Controls the idle speed.

Location

Located in the Idle Air Control Unit, back-side of the cylinder head, passenger's side.

Operation

It receives a pulse signal from the ECU which opens and closes an air passage allowing a precise amount of air to bypass the throttle plate.

Auxiliary Air Control (AAC) Valve <--> [Idle Speed/Throttle Actuator - Electronic]|Specifications|Page 2471 > < Auxiliary Air Control (AAC) Valve <--> [Idle Speed/Throttle Actuator - Electronic]|Specifications|Page 2469