S15/T15 Sonoma P/U 2WD L4-2.2L VIN 5 Flex Fuel (2001)
Idle Speed: Adjustments
The Powertrain Control Module (PCM) controls the Idle Air Control (IAC) valve in order to regulate the air flow through the idle air bypass passage.
The amount of air flowing through the idle air bypass passage determines the idle speed. The PCM directs the IAC valve according to changes in
engine load. A stalling or poor idle concern could be caused by the IAC valve not operating properly.
