I :heart: SUBARU
Join Date: Aug 2006
Location: Buffalo, NY USA
Car: '00OBW, '96&'94 Legacy
Feedback Score: 0 reviews
Right on, ECU = engine control unit or ECM = engine control module. It is essentially a computer with software that takes all sorts of inputs from engine sensors and controls engine fuel, spark, timing, etc.
Like all software, sometimes there are glitches/bugs that don't get noticed until it has been rolled out.
Don't worry, soon vehicles will download their own software updates via wireless internet. I'm sure someone already has the patent for that.....