Electronic Spark Control Module Symptoms. When the engine speed exceeds 400 rpm, the ecm sends a bypass signal to the ignition. Once you have diagnosed that the.

Working alongside your distributor and ignition control module, the electronic spark control module varies ignition depending on many things like engine load. The check engine light only turns on if the ecm ( engine control module ) is analyzing the data it receives not up to standards. To make this short, sweet, and to the point;