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Home >> Chevrolet >> 2002 >> Tracker 4D Utility, 2.5 4, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System & Component Testing >> Idle Control System >> Idle Air Control System Diagnosis (2.5L) >> Circuit Description
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Circuit Description

Powertrain Control Module (PCM) controls Idle Air Control (IAC) valve in order to regulate air flow through idle air by-pass passage. Amount of air flowing through idle air by-pass passage determines idle speed. PCM directs IAC valve according to changes in engine load. A stalling or poor idle concern could be caused by an IAC valve that is not operating properly.

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