The Digital Diesel Electronics (DDE) have been revised for the M57/M67. The DDE versions used are 4.0 and 4.1 respectively.
The DDE control unit features the familiar modular pin-socket system (5 pin sockets) and the printed-circuit board is of the multi-layer sandwich type.
The innovations introduced with the DDE 4.0 as used in the M57 are as follows:
• Advance delivery pressure control
• Rail-pressure control
• Activation of the injectors
The DDE 4.1 as implemented in the M67 has the following, additional new features:
• 2 control units because of the number of cylinders and the increased scope of function
• DDE control unit I controls the fuel injectors for cylinders 2, 3, 5 and 8
• DDE control unit II controls the fuel injectors for cylinders 1, 4, 6 and 7
• Separate CAN bus for communication between control units
• Redundant components for EGR and charge-air pressure control
