buick Workshop Repair Guides

Buick Workshop Service and Repair Manuals

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All Other Service Bulletins for Idle Speed/Throttle Actuator - Electronic:|033206|Page 2851 > < All Other Service Bulletins for Idle Speed/Throttle Actuator - Electronic:|033206|Page 2849

LeSabre V6-231 3.8L VIN L SFI (1992)

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Chart C-2B, Idle Air Control (IAC) Valve Check

CIRCUIT DESCRIPTION

The PCM controls idle speed by moving the IAC valve pintle which opens and closes the air passage bypassing the throttle valve. A "SCAN" tool
displays the commanded pintle position in counts. The greater the number of counts, the farther open the IAC valve is and the greater the commanded
idle speed. IAC counts range from 0 (fully closed) to 255 (fully open.) Normal is between 15 - 20 counts.

TEST DESCRIPTION

All Other Service Bulletins for Idle Speed/Throttle Actuator - Electronic:|033206|Page 2851 > < All Other Service Bulletins for Idle Speed/Throttle Actuator - Electronic:|033206|Page 2849