Conditions for Running the DTC

WARNING: This page is about a different car, the 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0336 is not set.
The ignition voltage is 6-18 volts.
The engine speed is more than 50 RPM.
The PCM is not in fuel shut-off, or decel fuel cut-off mode.