HonOBDapt

HonOBDapt translates requests for on-board automotive computer sensor data from an ISO standard OBD II format to a Honda proprietary format used in 92-95 Honda Civics.

HonOBDapt uses a general purpose microcontroller module equipped with external digital I/O ports, the Arduino Uno Rev. 3. HonOBDapt uses a Freescale MC33660 ISOLink logic level converter integrated circuit to electrically connect the OBD II signal line to the Arduino. HonOBDapt software is written in C++ and uses the SoftwareSerialWithHalfDuplex library.

HonOBDapt supports core interactive diagnostic functionality of the OBD II standard, comprised of essential sensor data including: air and coolant temperature, spark advance, fuel injector pulse width, exhaust gas oxygen content, engine speed (RPM), short and long term fuel trim, fuel system status (open or closed loop), manifold barometric pressure, atmospheric barometric pressure, throttle position, vehicle speed, etc. There is also a basic capability of translating check engine diagnostic trouble codes (DTCs). There is no support for obtaining OBD II freeze frame data, nor any analog to the concept of continuous fuel status, EVAP system or misfire monitoring.

These limitations notwithstanding this adapter serves a crucial purpose in allowing 92-95 Honda to be diagnosed with modern, readily available OBD II diagnostic scanners.