The rise in the sheer amount of electronics in the automobile, the use of software to control the vehicle, and the increased complexity of modern fuel-injection systems place high demands on the diagnostic concept, monitoring during vehicle operation (on-board diagnosis), and workshop diagnosis (Fig. 1). Workshop diagnosis is based on a guided troubleshooting procedure that links the many possibilities of on-board and off-board test procedures and test equipment. As emission-control legislation becomes more and more stringent and continuous monitoring is now called for, lawmakers have now acknowledged onboard diagnosis as an aid to monitoring exhaust emissions, and have produced manufacturer-independent standardization. This additional system is termed the OBD system (On-Board-Diagnosis system).
KeywordsCatalytic Converter Throttle Valve Fault Memory Diagnostic Function Electrical Fault
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