DME Diagnosis

General Information

Diagnosis
Monitoring of signals by the DME control module permits the system to perform reliable and exact diagnosis. Furthermore, certain additional functions such as the drive links test and input signals test can be activated and checked with the Porsche System Tester 2.

The fault memory can be read out and erased with the new Porsche System Tester 2. The data link connector is located below the knee guard on the driver's side.







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 realise 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