This is usually a two or three digit number stamped on the 28 pin ROM, or main processor. P5P : 97-00 OBD-2 Prelude Type-S (JDM ECU)Īs further identification Honda ECUs have a software revision number inside the ECU.P73 : 96-00 OBD-2 Integra Type-R (JDM & USDM).P30 : 92-95 OBD-1 DelSol DOHC Vtec Si/EG SiR.P14 : 93-95 OBD-1 Prelude Si (non Vtec).PG7 : 86-89 Integra (86-87 vac advance, 88-89 electronic advance).The second digit '0' typically means manual transmission, where a '5' means automatic transmission, and the last digit '1' is the version number. There are other versions of this, but you get the idea. The last 3 characters are broken down into 3 parts. a P72 OBD I ECU is different from a P72 OBD II ECU. Different generation ECUs may use the same characters.

The middle three characters are the most useful to identify what the ECU is. Three characters (which are the revision of the ECU) e.g.Three characters (which are loosely related to the model of car/engine).Honda's part number for ECU, which is always 37820.The part number consists of three components: Below is a stack of ECUs running from the newest generation at the top to the oldest generation at the bottom.Īll Honda ECUs have a part number which is located on the side of the ECU and inside the ECU on the connector. Honda ECUs run in generations, which use different connectors. There may be small daughter circuit board covering some of the main circuitry. Remove the computer, and with a philips screwdriver remove the metal lid from the top of the computer. The computer is connected via three connectors that pull out when a plastic clip is pressed. The ECU can be located in several places: under a metal plate in the passenger's footwell (models up to 91), in the passenger's footwell behind a plastic panel (models 92-99) or by the driver's footwell under a plastic panel (some models 2000+) To identify your ECU you will need to know its generation, part number and possibly its ROM number. Technical Information ECU Identification Identifying your ECU

Honda ecu pinout