So, when it goes bad, it can knock your Accord’s air fuel ratio off. Poor PerformanceĪs mentioned above, the ECM controls the engine timing, and air/fuel ratio. It may stall, and not be able to start again, until you turn the ignition all the way off and back on again. The misfire can come or go depending on what is going on with the ECM. Rough Running EngineĪn engine with a bad ECM will often run rough and misfire. Almost none of them have to do with the ECM. Now, the check engine light can turn on for a lot of reasons. This trouble code will tell you what part of the diagnostic that it failed, and you’ll have a pretty good idea of the appropriate action to take to fix it. If it fails the cycle, you’ll get a check engine light. When you start your Accord, the ECM will do a self diagnostic cycle. Here are some of the most common things that happen when your Accord’s ECM is bad. Make sure that you’re checking for trouble codes and doing what you can to make sure it’s not any of the more common causes of these problems before you jump straight to the ECM. While we’ve listed some of the most common symptoms of a bad ECM below, it’s not the primary cause for any of these. You very well get one such as P0606 (processor fault).īad ECM Symptoms: Honda Accord A typical ECMĭue to the immense power that the ECM has over your engine, there can be a lot of different symptoms when it goes bad. Your Accord does run self diagnostic checks, so it is worth it to check if there is any error code related to the ECM/PCM currently stored. When the ECM it self goes bad it can be extra challenging to determine that it is at fault. One of the problems with diagnosing the ECM, is that you depend on it to provide you with all the diagnostic data that you need to repair the engine, or engine sensors.
While modern engines are more complicated than older engines, this data more than evens out the advantage of the older engine. Other than the many performance advantages of an ECM over mechanically controlled engines, it also provides data that can help you diagnose what is wrong with the engine when there is a problem.
It’s so vital to the operation of your Accord that it won’t run without one. It uses the data from the oxygen sensors, camshaft sensor(s), mass airflow sensor, knock sensors, and much much more to make constant adjustments to the engine. The ECM takes all of the data from the various sensors, and uses it to operate the engine in a way that is significantly more efficient than traditionally controlled engines. Almost all of the essential functions of the vehicle are controlled by the ECU/ECM.
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