Engine control (SIM 4LDE) is incorporated within the ME control unit (N3/10).
The abbreviation SIM 4LDE means:
S = Siemens
I = Integrated
m = Motorsteuerung (engine control_
4 = 4-cylinder
DE = Direkt-Einspritzer (direct injection)
The following systems are controlled and coordinated by the ME control unit:
Ignition system
Injection system
Electronic accelerator/cruise control/idle speed control
Diagnosis and fault storage
Drive authorization system/immobilizer
Emission control system
Depending on the equipment and model, additional control units are networked via the CAN databus (Controller Area Network) with the ME control unit.