Tapping the Onboard Diagnostics

Published by Andrew Hreschak in research and planning, the xtras
Published on 12/04/05 @ 12:44:00 am using 322 words, and has 14560 views

AutoTap Diagnostics InterfaceCAPTION: The AutoTap System Diagnostics Display

A few nights ago a friend and I were discussing Dyno Scans, and tapping the onboard diagnostics (OBD) port to get an inside look at engine operations. I got to thinking about that, and dug up a bunch of links that deal with hardware/software options for tapping the OBD port that comes standard with every car manufactured after 1996.

I'm not sure if I'll implement this as an addition to the Acura ITX project, but while the planning stages are underway I'll keep the links available here in case I decide to hardwire a tap into the OBD port.

The first thing I did was to perform a quick visual inspection of the Acura's OBD port (first picture), to learn exactly which language it speaks. Shining a flashlight onto the port itself, I saw that pins 4, 5, 7, 9, 14, and 16 were active, which means the Acura uses the ISO language. The language is crucial, as not all taps and software apps will communicate with all vehicles.

In any case, here's a brief list of links for OBD software and taps:

OBD Scanner circuit schematic, including part numbers

AKM Electronics OBDII Information

Andy Whittaker's OBD-II Hardware Site

Andy Whittaker's OBD-II Software Site

Auterra's OBD II Scan Tools for Windows and Palm OS

AutoTap OBDII Diagnostic Scanner - Product Information - Screenshots

Dyno-Scan - Automotive OBD II Scanner Kits for Windows PCs

FreeDiag, Open Source OBD Software Interface

Introduction to OBD-II

Jeff Noxon's ODB-II PCB schematics: Build Your Own

MP3Car OBD-II Forum

Multiplex Engineering, Prebuilt OBD Modules

OBDII Automotive Diagnostics Homepage

OBDII Automotive Scan Tool and Virtual Dashboard

OBDII OpenDiag Software

OBD-2 Vehicle Explorer Scan Tool Browser

ScanTool.net - ElmScan ISO OBD-II Scan Tool

TroubleCodes.net- engine & OBD2 Trouble Codes and Technical Info

Contemporaneous Auditory Narcotics:
or, What my speakers are currently pumping...
Miles Davis - On the Corner

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