This ECM power relay acts as a switch that supplies power to the ECM. It contains a relay for the ECM that is powered up when the ignition key is turned to the on position. The power distribution center, or fuse block, located under the hood houses most or all of the vehicle’s fuses and relays. In order to dispense power to operate these other systems, the engine control module requires power itself. The ECM monitors and adjusts operation and power distribution to the fuel supply and injection systems, engine timing, exhaust gas recirculation, emissions, ignition system, and several other systems. This is actually the case for the engine and its related functions as it is controlled by the engine control module, or ECM. Vehicle development has evolved over the past several decades to a point where it seems every vehicle function is controlled by a computer, right down to the engine itself.
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