OBD2: On Board Diagnostics 2
OBD2 (On Board Diagnostics 2) is a US standard established in 1996 that specifies methods for accessing vehicle engine computers, emission controls, and related systems. Required on all North American vehicles since 1996.
Overview
OBD2 (On Board Diagnostics 2) is a standardized specification established in the United States in 1996 that defines methods for accessing vehicle engine computers, emission controls, and diagnostic parameters. Since the 1996 model year, all North American automobiles are required to provide an OBD data port for connection to diagnostic equipment.
The OBD2 port enables retrieval of emission-related diagnostic information and, in many cases, real-time vehicle operating parameters. In Europe, this standard was adapted as EOBD, with mandatory compliance required since 2001 for gasoline engines and 2003 for diesel engines.
Note
Honda ECUs from the European market (EDM) built between 1996 and 2000 utilized a 3-pin connector incompatible with OBD2 for communication with diagnostic equipment.
OBD2 ECU Models (1996â2001)
The following ECUs implement OBD2 compliance across Honda and Acura platforms:
| ECU Model | Model Years | Vehicle | Market |
|---|---|---|---|
| P72 | 1996â2000 | Integra GSR | USDM |
| P73 | 1996â2000 | Integra Type-R | JDM & USDM |
| P75 | 1996â2000 | Integra LS/GS | USDM |
| P2E | 1996+ | Civic LX | Automatic (USDM) |
| P2N | 1996+ | Civic HX Coupe | USDM |
| P2P | 1996+ | Civic EX Coupe | USDM |
| P2T | 1999+ | Civic Si Coupe | USDM |
| PCF | 1999â2001 | Accord Wagon | JDM |
| P5P | 1997â2000 | Prelude Type-S | JDM |
| P5M | 1997â2000 | Prelude | EDM, Oz DM |
| P28-G03 | 1996+ | Del Sol (SOHC VTEC) | European |