No. How the heck would it do that? It's not even sealed! It's just for mechanical/handling protection. It has no environmental or electrical (i.e. shielding) purpose at all. The ECU will work just as well without it as with it.

Just FYI... If you're builiding electronics, particularly those that go into environmentally challenging applications such as automotive or aircraft, one of the decisions you ahve to make concerns environmental protection. If you have a situation that demands sealing, it had better be *damn* good sealing. Why? Because in humid environments, like most of the world, small atmospheric pressure variations, caused by normal weather patterns or by driving over altitude changes, eventually cause the slow process of "pumping" moisture into the "sealed" module unless it is PERFECTLY tight. Naturally this situation is exaggerated on aircraft, but it's present to a lesser degree -- which translates to a longer-term phenomenon -- in automotive applications. Once you get moisture in there, you have a serious problem on your hands. Failure is only a question of time, not a question of will/won't. Therefore, you are better off taking the approach that the BMW engineers did (they're pretty smart folks, actually) which is to forego any attempt at sealing and simply mount the elex in a fairly water repellent box and add some forced ventilation. The success of this approach is pretty clear. Cars that are approaching two decades of life still have perfectly functioning electronics.