Conditions For Setting DTC

WARNING: This page is about a different car, the 2003 Pontiac Grand Am, 2003 Oldsmobile Alero, 2003 Chevrolet Monte Carlo, and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

The Engine Speed parameter is 100 RPM less than the Desired Idle Speed parameter for more than 8 seconds for each test.
The PCM detects the IAC test failed 4 consecutive times in one ignition cycle.
The vehicle must enter the above criteria and then leave the criteria for 1 second to complete one IAC test.