Transmission Control Systems: Testing and Inspection

Matching DME(DDE) - EWS III

In specific cases, it is possible that synchronization between the DME/DDE control unit and EWS control unit may deviate from each other. In these cases, the test module refers to the matching procedure which must then be carried out. In this way, the variable codes of both control units are reset to the common starting value.

This matching procedure must also be conducted when a new engine control unit is installed. In this case, the matching procedure adopts the basic code of the EWS control unit from the DME(DDE) control unit. This basic matching procedure is only possible once.

With this matching it is therefore not possible to adjust DME(DDE) control units - which were adapted in another vehicle with another EWS control unit - to a further EWS control unit.