Engine Management
EGR TechnologyEGR and On-Board Diagnostics (OBD) In times before vehicles were equipped with component monitoring systems, the failure of a component in the EGR system often remained almost unnoticed. However, since the introduction of on-board diagnostic systems, known as "OBD", every malfunction is "a case for the repair shop". Within the scope of OBD II (USA), the EGR system is monitored for function and effect. According to EOBD, the European version, electronic monitoring of the components and monitoring the function are adequate. EOBD does not stipulate any test of the effectiveness. Various manufacturers also supply European vehicles according to OBD II standards. However, one observation is of extreme importance when troubleshooting: although EGR components are monitored by the on-board diagnostic system, and a failure or incorrect functioning will be detected, this is not always the actual cause of the failure or fault.
One of the most frequent causes of malfunctions in the EGR system is stuck or carbonised EGR valves that become noticeable, for instance, through error messages such as "EGR flow rate too high" or "too low".
However, since nothing "gets stuck" by itself, the actual causes must be investigated as they can arise from a number of different faults.
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