Grand Prix V6-204 3.4L DOHC (1992)
Idle Speed/Throttle Actuator - Electronic: Testing and Inspection
Idle Air Control (IAC) Valve Circuit Diagram
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 5 - 50 counts.
TEST DESCRIPTION
