![]() ![]() A diagnostic tool is a computer program that has the ability to exchange information with the engine’s ECM.Īt BoatBuy, we have the ability to complete a ECM plugin on most petrol engines, inboard and outboards should you request it. Marine engine manufacturers each have their own engine management software and diagnostic tool. If any of the engine’s ECM inputs go outside of the preset parameters the engine can sound a warning alarm and potentially de-rate / limit the RPM of the engine to prevent significant damage to the engine occurring. The list of possible engine inputs can become exhaustive, some further basic examples are oil pressure, coolant temperature, throttle position, inlet manifold pressure and exhaust manifold temperature. As a result the ECM now knows when to “output” the signal for fuel injection and spark to the given cylinder. An example “input” could be crankshaft and camshaft position (so the engine knows where each piston is at any time). ![]() The ECM receives “inputs”, analyses data and delivers “outputs”. ![]() That little black box is the ECM or ECU (engine control module/unit). The little black box, where the “magic happens” controls modern marine engines. Engines typically have diagnostics and reads outs performed by one computer although may have multiple computers fitted. We will explain the reasons why you would plugin to the computer, and what you can expect to achieve from doing so. Whilst there are a few different names for plugging into a boat computer, for this article we’re going to call it the Engine Control Module (ECM). ![]()
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