VDO CONTISYS OBD - V3.0 Instruction Manual

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EOBD Application11EOBD ApplicationWhat is EOBD?The American Environmental Protection Agency and the European government haveset targets for reducing the levels of pollution produced by passenger and commercialvehicles. In order to ensure that these targets can be met, manufacturers are requiredto build new vehicles which meet increasingly stiff emissions standards. Themanufacturers must further maintain these emission standards for the useful life of thevehicle. In order to meet and maintain these standards the vehicles are fitted with On-Board Diagnostic systems which monitor the integrity and effectiveness of all emissionrelated components.As vehicles are becoming more and more complex, many of the systems fitted tothem are being controlled by electronic control modules. Most vehicles now havemultiple control modules (e.g. Engine, Transmission, Body, Suspension, etc.) locatedat different locations on the vehicle. The On-Board Diagnostic systems are integratedinto the vehicle control modules.With so many different vehicle and component manufacturers, a common interfacewas required to communicate with these control modules. In 1988, the SAE (Societyof Automotive Engineers) created a standard that defined a standard diagnosticsocket (J1962) and a set of diagnostic test signals.With the diagnostic socket and diagnostic signals agreed, another standard wasproduced that defined a universal inspection and diagnosis method to ensure that avehicle is performing to Original Equipment Manufacturer (OEM) specifications. Thisstandard is known as EOBD (European On-Board Diagnostics).The fundamental requirement for an EOBD system is that in the event of an emissionsrelated component fault, a DTC (Diagnostic Trouble Code) will be stored in thememory of the control module responsible for that component, and a MalfunctionIndicator (MI) lamp will illuminate on the vehicle's instrument pack to alert the driver.The DTC can then be retrieved using diagnostic equipment to determine the type andstatus of the fault.