Most of theASR failures seem to be related to the electronic throttle actuator. Also the accelerator (throttle) position switch sometimes gets funky and will trigger the limp in mode. (If the engine control computer senses the electronic throttle opens, but the accelerator position switch has not closed to indicate movement of the accelerator pedal--it goes TILT and goes into the limp home mode.

If the throttle plate position sensor reading does not agree with what the computer tells it to be--again it goes TILT.

To make it 'fool proof', the ETA has yet another throttle plate position sensor called a 'reference', and its resistance changes opposite to that of the first position sensor, and if the two 'position sensors' do not agree ---TILT.

If the values read on the position sensors do not move in a smooth and unbroken fashion--TILT again.

It won't run-away for sure. Now--if the damn things would just WORK.