Idle Speed/Throttle Actuator - Electronic: Testing and Inspection

The scan tool displays Idle Air Control (IAC) position in counts. "0" counts indicates the PCM is commanding the IAC to be driven all the way in to a fully seated position. This is usually caused by a vacuum leak. The higher the number of counts, the more air is being commanded to bypass the IAC pintle. Use Chart C-2C Idle Air Control Valve Check for diagnostic procedures. Refer to System Diagnosis/Procedures. Testing and Inspection