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OCR: Data View Help ldle Air Control (IAC) Valve/Motor: Testing and Inspection Chart C-2B Image Chart C-2B Image IAC Circuit CIRCUIT DESCRIP TION The M controls engine idle ENGINE T HORMAL OPERATING speed with the IAO valve To TEMPERATURE PARK/NEUTRALM increase idle speed the ECM INSTALL PARKING TECH BRAKE KET retracts the IAC valve pintle away from pass its by seat, allowing more air to CYCLE SELECT 1AC TO RPMI 1500 THROUGH CONTROL RPM ITS (MISC RANGE TEST! FR the throttle bore RPMUP decrease idle speed it extends the RPM SHOULO CHANGE ATHIOOWS IAC valve pintle towards its seat, DOES IT reducing bypass air flow Scan" tool Will read the ECM commands to the IAC valve in counts The higher the counts indicate more air huna thin idlal The the General Motors 93 Buick Century FW[ V6 3300 3 31 ATNORMA ...