What is OBD or OBD-2/EOBD?

OBD is the abbreviation of On Board Diagnosis, a diagnosis-system integrated in the vehicle. OBD2/EOBD is therefore an aid to the maintenance and mistake recognition in current, modern vehicles with a multitude of computer-aided systems. An OBD-II interface provides almost complete engine control and allows for the readout of DTCs (Diagnostic Trouble Codes) that have been generated by the on-board computer, as well as real-time data from the sensors connected to the on-board computer. In addition, the OBD-II interface provides a means to clear the DTC list once maintenance has been completed.

The tasks of OBD are:

- continuous supervision of all exhaust fume relevant components in all vehicles - ever present grasping and reporting of essential emission increases during the total operation of a vehicle - Guarantee of durably low exhaust fume emissions - Protection of components, for example the catalyst in misfire - Storage of the data in appeared mistakes - Provision of an interface for selecting the stored data

Where'd it come from?

To combat its smog problem in the LA basin, the State of California started requiring emission control systems on 1966 model cars. The federal government extended these controls nationwide in 1968.     Congress passed the Clean Air Act in 1970 and established the Environmental Protection Agency (EPA). This started a series of graduated emission standards and requirements for maintenance of vehicles for extended periods of time. To meet these standards, manufacturers turned to electronically controlled fuel feed and ignition systems. Sensors measured engine performance and adjusted the systems to provide minimum pollution. These sensors were also accessed to provide early diagnostic assistance.     At first there were few standards and each manufacturer had their own systems and signals. In 1988, the Society of Automotive Engineers (SAE) set a standard connector plug and set of diagnostic test signals. The EPA adapted most of their standards from the SAE on-board diagnostic programs and recommendations. OBD-II is an expanded set of standards and practices developed by SAE and adopted by the EPA and CARB (California Air Resources Board) for implementation by January 1, 1996. In Europe, OBD II was received from 2001 as an OBD or EOBD.

Does my vehicle have OBD II?

In the USA is prescribed for all new vehicles from the 1 January 1996 OBD-2. That is that also vehicles can have for the American market with model 1995 already OBD-2. In the EU was named for new vehicles with Otto-motor 2001 with the EURO-3 standards OBD-2, here as of 1 January EOBD, was introduced. For automobile diesel vehicles, EOBD is introduced on the 1 January 2003 and for truck first on the 1 January 2005. American or European vehicles have OBD-2 if - an available connector with the scheme of the below-mentioned picture and - In the engine compartment a sign or sticker with the reference "OBD II compliant" or the entry "EURO-3".

Pencils 2 - J1850 bus + Pencils 4 - vehicle-mass Pencils 5 - signal mass Pencils 6 - CAN High (J-2284) Pencils 7 - ISO 9141-2 K exit Pencils 10 - J1850 bus Pencils 14 - CAN Low (J-2284) Pencils 15 - ISO 9141-2 L exit Pencils 16 - battery (+ )

- The connector should be in the vicinity of a meter of the driver. Usually under the instrument panel or under the ashtray. - All pencils of the connector are not be laid. According to related protocol, further connector places cannot be be laid with contact-pencils. - In European vehicles with Otto-motor from model 2000 it gives the false function notice (MIL) (PAINTED) portrayed yellow below That over the OBD-2 connectors selection cash parameter and values are in all vehicles same, not however the transmission protocols related in addition. The manufacturers unfortunately were not able to agree here. As a rule of thumb counts: for general of motor of vehicles and easy trucks, SAE J1850 VPW (variable pulse Width modulation) becomes, for Chrysler of vehicles and all European and Asian vehicles ISO 9141 with KWP (Key Word protocol) and for Ford SAE J1850 PWM (pulse Width modulation) used. In vehicles from model 1996 can be determined based on the connector occupancy, which protocol is used:

Pencil (signal)	Pencil (mass)	Pencil (signal)	Pencil (signal)	Pencil (+ 12 V)	Protocol
--	4 + 5	7	15	16	ISO 9141-2
2	4 + 5	--	10	16	PWM J1850
2	4 + 5	--	--	16	VPW J1850
--	4 + 5	6	14	16	CAN bus

It is in addition possible that you have a vehicle with the above-mentioned connector occupancy, but it is not OBD-2 in conformity, if it concerns a vehicle model before 1996. Security gives the sticker "OBD II compliant" or the entry "EURO-3".