If sensors are the ECM’s nerves, then solenoids (including injector solenoids) can be thought of as the “muscles” that the ECM controls. The ECM is the brain and can “feel” problems through its wires and nerve-like sensors.
Think of your truck’s ECM and its electrical system being similar in function to your body’s electrochemical nervous system. Today’s technicians need to truly understand the electronics and the ECM. Just being good with a wrench doesn’t cut it anymore. And each year, these electronics become more and more integrated in the truck. These days, just about everything on the engine is monitored and controlled by the engine computer, also commonly referred to as the ECU (Electronic Control Unit) or ECM (Electronic Control Module). It’s been 19 years since the first computer-controlled electronic diesel engine for semi trucks has been released.
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