Conditions For Setting DTC

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2003 Pontiac Grand Prix, 2003 Pontiac Bonneville, 2003 Chevrolet Monte Carlo, 2003 Chevrolet Impala, and 2003 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

The actual engine speed is 175 RPM more than the desired idle speed for more than 8 seconds for each test.
The PCM detects the IAC test failed 5 consecutive times per ignition cycle.
The vehicle must enter this criteria and leave the criteria for 1 second in order to complete one test.