Engine Control Module: Description and Operation

DME Control Units:

2 DME control units operate in this system. The DME control unit I supplies the row of cylinders 1 (cylinders 1...6). the identical control unit supplies the row of cylinders II (cylinders 7...12). For the purpose of differentiation in diagnosis mode, Pin 48 on control unit II is connected to ground. Relevant components are mostly installed in duplicate. Exceptions are.

- Start relay

- Start lock-out relay

- Camshaft sensor

- Intake temperature sensor

- Engine temperature sensor

- Secondary air pump

- Electrical fuel pump

- EKP relay (electrical fuel pump)

The DME control units are connected with following systems:

- Adaptive transmission control AGS

- Electronic throttle control EML

- Dynamic stability control DSC

- Instrument cluster electronics IKE

- Central body electronics ZKE

- Antitheft system DWA via ZKE

- Multi-information display MID via IKE

The digital motor electronics DME undertakes following functions:

- Cylinder-individual injection with correction feature

- Ignition

- Ignition circuit monitoring

- Cylinder-selective, adaptive knock control with 2 sensors per row of cylinders

- Idle control via throttle valves of electronic throttle control EML

- Lambda control

- Load setting via hot-film air mass meter HFM

- Incremental system for engine speed and reference mark signal

- Cylinder reference by inductive pulse generator on camshaft gear

- Electrical fuel pump activation (EKP) with safety lockout function at speed zero

- Characteristic map-controlled tank ventilation

- DSC engine intervention (dynamic stability control)

- Drive-away protection via antitheft system (DWA), multi-information display MID or electronic drive away inhibit EWS

- Characteristic map programming

- Idle CO adjustment (vehicles without lambda control)

- Secondary air pump control

- Interface to AGS via CAN (Controller Area Network) data bus

- Ignition timing (angle) intervention by adaptive transmission control (AGS)

- Self-diagnosis and emergency operation characteristics

The EML undertakes following functions:

- Engine speed limitation

- Speed limitation by V-signal

- The idle system is controlled by the DME and carried out by the EML by correspondingly positioning the throttle valve.

- Maximum speed limitation takes place directly by reducing the throttle angle.