What is OBD in 'OBDI' and 'OBDII'?

[poizon]

I know they are different variants of ECUs on our ITRs,

1. What do they mean
2. What are the differences
3. How to tell whether you're on OBDI or OBDII

Thanks ahead for the replies.

[tinkerbell]

http://en.wikipedia.org/wiki/On-Board_Diagnostics

On-Board Diagnostics, or OBD, in an automotive context, is a generic term referring to a vehicle's self-diagnostic and reporting capability.

ecu part numbers:

OBD JDM (88-91)

PM7 civic/crx Si DOHC ZC; semi-rare ecu
PR3 civic/crx SiR & integra XSi/RSi DOHC VTEC (B16A)
PW0 civic/crx SiR & integra XSi/RSi DOHC VTEC (B16A)


OBD-1 U.S. (92-95)

PR4 integra RS/LS/LS-SE/GS (B18B); same programming as P74 & P75
P0A accord EX (SOHC VTEC)
P05 civic CX; uses 1-wire 02 sensor, convertable to VTEC (may vary)
P06 civic DX (D15B); convertable to VTEC (may vary) & supports B-series DOHC VTEC& non-VTEC programming
P07 civic VX (D15B SOHC VTEC-E); 2 versions of this ecu - one is P28-like, the other is an oddball ecu and is not suggested for reprogramming, uses 5-wire 02 sensor. P28-style P07 supports B-series DOHC VTEC programming.
P14 prelude Si DOHC (H23)
P13 prelude DOHC VTEC (H22A)
P28 civic Si/EX (D16Z6 SOHC VTEC); reprogrammable to DOHC VTEC
P30 civic delsol Si VTEC (B16A)
P61 integra GSR (B17A); only availabe in the US
P72 integra GS-R (B18C1)
P74 integra RS/LS/LS-SE/GS (B18B); same programming as PR4 & P75
P75 integra RS/LS/LS-SE/GS (B18B); same programming as PR4 & P74

OBD-1 JDM/EURO (92-95)

PR3 integra XSi/RSi DOHC VTEC (B16A); semi-rare ecu, equivilent to a US P30 ecu.
P08 civic VTi (D15B SOHC VTEC); small ecu body, equivilent to a P28, supports B-series DOHC VTEC programming
P13 prelude DOHC VTEC (H22A); only supports JDM P13 programming
P27 civic coupe (D16A); rare ecu, equivilent to a P28. supports B-series DOHC VTEC programming
P29 civic (DOHC ZC); rare ecu! equivilent to a P06/DX ecu. supports B-series DOHC programming
P30 civic SiR & delsol SiR (B16A); small ecu body
P72 integra SiR/SiR-G (B18C); small ecu body
P91 civic orthio (D16A SOHC VTEC); rare but equivilent to a P28, supports B-series DOHC VTEC programming


OBD-2a U.S. (96-98)

P2E civic DX coupe
P2N civic HX coupe; uses a 5-wire 02 sensor
P2P civic EX coupe (D16Y8)
P72 integra GS-R (B18C)
P75 integra RS/LS & LS-SE/GS
P13 96-97 prelude VTEC ( H22A); rare ecu!
P5M prelude VTEC (H22A); remained OBD2a from 98-00

OBD2a JDM

P2T civic Si coupe (B16A)
PCT civic Type-R (EK9/B16B)
P73 integra Type-R (B18C)


OBD-2b U.S. (99-01)

P2T civic Si coupe (B16A)
P72 integra GS-R (B18C); Immobilizer equipped
P73 integra Type-R (B18C5); Immobilizer equipped
P75 integra RS/LS/GS (B18B), Immobilzer equipped

OBD-2b (JDM)

PCB prelude Type-S
PCT civic Type-R (EK9/B16B)
PCX S2000 (F20C)

OBD-2c

PRB A01-A05 RSX Type-S (US)
PRC RSX Type-R (JDM)
PRD Civic Type-R (JDM)

basically - if you have a AUDM DC2R - you have a OBD2a "P73" ECU

but to CONFIRM your OBD version - this is what the ECU plugs look like:

OBD2a



OBD2b