Conditions For Running DTC

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Sonoma, 2002 GMC Safari, 2002 GMC Jimmy, 2002 Chevrolet S10 Pickup, and 2002 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

The engine is running for more than 2 seconds.
The engine speed is more than 400 RPM.
The ignition 1 signal is more than 8 volts.
The MAF sensor frequency is stable for more than 1 second.