废气再循环压力诊断
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Electrical exhaust gas recirculation
Pressure diagnosis
While exhaust gas is admitted into the intake manifold, the intake manifold pressure sender must register a rise in pressure (less partial pressure). The engine control unit compares the pressure rise in the intake manifold with the supplied exhaust gas quantity and can thus determine whether the exhaust gas recirculation (EGR) system is functioning properly. This diagnosis is only carried out in overrun mode, because injection is deactivated as a disturbing influence for measurement and the intake capacity of the engine is very high.
— “Euro On-Board Diagnostic System For petrol engines Self-Study Programme 231″, © VOLKSWAGEN AG, Wolfsburg