Monitor Condition

WARNING: This page is about a different car, the 1995 Oldsmobile Ninety-Eight and 1995 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.

PCM will run EGR test when the following conditions are present.

Codes P0122, P0123 or P0501 are not set.
Brake has been applied.
Engine coolant temperature is greater than 185°F (85°C).
Throttle angle is less than one percent.
Vehicle speed is greater than 25 MPH.
Engine speed is 900-1100 RPM.