System Overview

System overview, operation






Bus-connected components

System Overview, Components Connected To K Lead:

Components connected to K lead


Brief description

System Overview, Brief Description, Other Models:

The two powertrain systems EDC 15 and the diesel pump are not connected to the I bus. These systems require much faster communication so that there are no noticeable delays, when EDC requests a new fuel mass per injection or a new injection angle. Therefore, they are connected to a separate bus called the P bus (Powertrain Bus). Communication on the P bus is ten times faster than on the I bus.
The P bus is also connected to MIU. The MIU is responsible for making the information that is available on one of the buses also available on the other. The other powertrain systems, Trionic, Motronic and TCM, as well as the auxiliary heater for diesel engines, are not connected to the bus. Note also that EDC 15 has a separate K lead to the diagnostic tool.
All the other bus systems communicate with the diagnostic tool via DICE, one of the I bus control modules.