How about this? Haynes PCM test. This is a word for word quote from the manual:
"Using the tips of the fingers, tap vigorously on the side of the computer while the engine is running. If the computer is not functioning properly, the engine may stumble or stall, and display glitches on the engine data stream obtained using a SCAN tool or other diagnostic equipment."....."If there are no obvious signs of damage, have the unit checked at a dealer service department."
Of course if you happen to be trying to figure why the engine won't start.......