Conditions For Setting DTC
WARNING: This page is about a different car, the 2003 Pontiac Grand Prix, 2003 Chevrolet Malibu, and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
The PCM detects that the average transition time ratio is not within 0.4-4.2 during a 100 second monitoring period.