General Information on DME

General
A further-developed Motronic (DME) system with the designation M 5.2.2 is installed to produce the injection signal, to calculate the ignition timing angle, to realize adaptive controls of various systems, and to perform diagnostic functions.

Essential characteristics of the DME
- Electronic map-based ignition with stationary high-voltage distribution
- Sequential injection
- Mixture controlled separately for each cylinder bank
- Adaptive stereo oxygen sensor closed loop control
- Floating oxygen sensors
- Oxygen sensor heating controlled via ground side
- Hall-effect sensor installed on inlet camshaft for cylinder bank 1 - 3
- Control of VarioCam valves for cylinder banks 1 - 3 and 4 - 6
- New hot film mass air flow sensor
- Intake air temperature sensor installed in hot film mass air flow sensor
- Cylinder charging control with new two winding IACV (positioner)
- Adaptive throttle potentiometer
- Adaptive knock regulation
- Oil temperature measurement
- New temperature sensor for engine temperature measurement and analogue display in the instrument cluster
- Engine compartment temperature sensor to control the engine compartment purge fan
- Radiator fan control by the DME control module
- Starting relay activation and disabling
- Control of the A/C compressor relay
- Activation of the Check Engine light in the event of misfires damaging to the catalytic converter
- Torque reduction upon Traction Control demand by means of ignition timing retardation and injection suppression
- Electronically controlled ventilation of the carbon canister
- Airbag control module switches off fuel pump in the event of an accident
- Programmed idle speed changed in the case of Tiptronic vehicles and engaged transmission range
- Torque reduction during shifting operations of the Tiptronic transmission
- Facility to inject disturbances for testing the oxygen sensor control loop (e.g. for inspection and maintenance)

Additionally for USA vehicles:
- Complete scope of OBD II functions with activation of the Check Engine light
- Secondary air system
- Two additional oxygen sensors behind the catalytic converters
- Additional Hall-effect sensor for camshaft of cylinder bank 4 - 6