Here is the location in the vehicle for most Honda Civic/CRX ecus. Most of the times, it is in the location pictured below. This happens to be true for the Civic models, while Accord models have it at the bottom of the center console. Some models use an ECM (or ECU) for the engine and one for the automatic transmission (TCM or TCU) and some other models use one module for both things (PCM).
You located the module, but not sure if it is the engine ECM? You can make sure by checking the part number of the box. It should be in the format of “37820-Pxx-xxx” and you will find that number on its side label. The “X” in the number format can be any combination of numbers or letters. Any other number that does not start with “37820”, it is not the engine ECM, but a different module, as there are several electronic modules around the interior of the car.
In the picture below, there is an example of a P04 engine ECM. The complete number is “37820-P04-G52”. You can notice that every time we refer to an ECM as the “P04“, “P28“, “P0A“, etc., we are referring to the three characters in the middle of the complete ECM part number, as it is the code of the ECM “family”, while the last three numbers are the country, transmission, and software version. In this same example, the “G52”, “G” indicates that is a European ECM from Great Britain of GDM (Great Britain Domestic Market), The “5” means automatic transmission (5 and greater = A/T, while “0” is M/T) and the last number, the “2” is and identifies of the version of software (there are “0”, “1”, “2” and in some, “3”).
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