Active diagnosis 3

The active diagnosis is a DME function. The function runs within a temperature window from 80-105°C. The function generates an artificial load. This facilitates a diagnosis only in the charged mode. However the engine generates heat during this and the electric fan is therefore activated. This component reacts slowly, therefore the function may possibly abort near the two limits. The function increases the engine speed to generate load. The DME then alternatingly activates the wastegate of the exhaust turbocharger. During this, the pressure histories are monitored by the pressure sensors. According to the pressure histories of the individual exhaust turbochargers, the DME evaluates the behavior of the charging system. At the end of the function, a message about the status of the charging is displayed. If the charging system is found to be OK and there is only one customer complaint an additional troubleshooting is unnecessary!