Introduction

Schematic View - New Features Of DME M5.2:

The new Digital Motor Electronics M5.2 System is being introduced with the M73 engine in the E38 750iL. It is the next generation of Motronic control systems including new features and functions that will be phased into production on other models.

The M5.2 includes features already found on the M3.x systems including
- Hot Film Air Mass Sensors
- Knock control
- Hall Effect Camshaft Position Sensing
- CAN Bus Utilization
- Fully Sequential Fuel Injection
- Selective Injector Cancelling

M5.2 features and functions that are new include:
- OBD II (On board Diagnostics - Version II interface compatibility)
- Catalytic Converter Operation Monitoring
- Engine Mechanical Misfire Detection
- Secondary Air Injection System
- Control of new smaller, lighter ignition coils
- Automatic Starter Motor Control
- Purge Valve Operation

Engine Compartment E-Box:

Both DME control modules are located in the engine compartment E-Box as shown.

Schematic View - DME I Inputs/Outputs:

Schematic View - DME II Inputs/Outputs: