11/12/2022 0 Comments Ecm magic engine![]() This image alone tells us that the fuel inlet metering valve is a normally open valve. The waveform was captured during a wide open throttle (WOT) condition. The yellow trace is the fuel rail pressure sensor voltage (feedback) and the green trace is the current flow through the inlet metering valve (command). The actual operation of the fuel system can be compared to the desired system operation and using the data, a decision can be made on the condition of the system and where a fault (if any) may be.Īn oscilloscope is another important tool when investigating a fault with such a complex system.īelow is an oscilloscope waveform from an Audi with the 2.0L common rail engine. There is an enormous amount of data available from these data parameters, which can allow you to ascertain the nature of the fault. However, if you prepare yourself with a fundamental understanding of the system and all data available about the fault, a systematic approach to the fault-finding procedure can be carried out.īelow is a table showing the live data returned from a common rail diesel injection vehicle with an EDC16 engine management system:įuel pressure measure/desired loop difference Many modern systems, such as common rail diesel injection, can appear to be so complex that they seem to operate by magic.Īs a vehicle technician you can be presented with a seemingly endless amount of data relating to fuel pressure feedback, fuel pressure control, cam/crank synchronisation, measured mass airflow, injector flow correction feedback, and many other areas. This month’s Technical Focus article shows that a systematic approach to fault-finding can help the technician get to the bottom of a problem quicker. ![]()
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