BTW - both sets of instructions use 'ECU' where we've been using 'ICM.' I prefer ICM because it's less ambiguous.
ECU can refer to a lot of electronic control units that are very different in function and application. (For example, some newer RV refrigerators have 12V electronic control units --ECUs -- for governing the propane and 120V operation.)
Ignition Control Module (ICM) is more specific. Via context, we can assume it applies to a motor vehicle engine ignition system.
(ICM is still somewhat ambiguous, although less so. Some non-pilot light stoves and furnaces have ICMs for igniting the propane or natural gas.)
