Great write up Gramps!
I just want to emphasize this blurb from the 2008 Patriot Owner Manual:
Malfunction Indicator Light (MIL)
I did do an extensive write up on what the system goes through to check all of the systems and what it takes for them to turn the warnings on/off by themselves. You may want to look threw it for your own peace of mind. http://www.jeepforum.com/forum/f98/e...seless-855751/
This light is part of an Onboard Diagnostic
system called OBD II that monitors emissions,
engine, and automatic transmission control systems.
The light will illuminate when the key is in the
ON/RUN position before engine start. If the light does
not come on when turning the key from OFF to ON/
RUN, have the condition checked promptly.
Certain conditions such as a loose or missing gas cap,
poor fuel quality, etc., may illuminate the light after
engine start. The vehicle should be serviced if the light
stays on through several of your typical driving cycles.
most situations the vehicle will drive normally and will
not require towing.
If the MIL flashes
when the engine is running, serious
conditions may exist that could lead to immediate loss of
power or severe catalytic converter damage. The vehicle
should be serviced as soon as possible if this occurs.