Theory of Operation
WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) will turn on the MIL lamp immediately after the diagnostic runs and fails. During this time the ETC lamp will also illuminate. The PCM will turn off the MIL lamp after the diagnostic runs and passes in four consecutive drive cycles.