My Damn Check Engine Light Is Still On! How Do I Debug My Engine? A Dive into Engine Control Units
summary
Shows concrete debugging steps for an engine ECU: obtain Megasquirt source code, connect an inexpensive ELM327 OBD-II dongle to the port, and use python-OBD to read live PIDs, freeze-frame fault data and log to CSV. Demonstrates a running bench built from a donor harness and a Continental ECU, including a live demo of injecting a simulated EGR coil fault, reading and clearing DTCs, and restarting the engine to avoid professional diagnostic costs.
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