The automobiles of today are required to perform a multitude of electronic functions, and the list is still growing with only a limited amount of space available. The auto makers are forced to miniaturize nearly every component used in today's design. The ECM is not immune to this shrinkage, and the surface mount style of circuit design is employed in an increasing number of fuel injected vehicles. Surface mount componentry is constructed exactly as it sounds, i.e. the parts simply lie on top of the board connected only by the solder that connects it to the circuit.
Hopefully, the auto industry will make the necessary changes to correct these design problems, but for now it's something we will have to live with.