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DME reduces torque during the gearshift procedure (ignition timing retarded)
Mandatory
TR
Engine speed signal (3 timer pulses per crankshaft revolution)
Square-wave voltage
EGS receives information relating to the engine speed
Mandatory
ASC/MSR
Automatic stability control or engine drag torque control
U-Bat
2 functions within DME control unit: complete torque cut-off if currently active (MSR) Otherwise, ignition timing set towards retard (ASC)
Optional
ASC/ZAB
Automatic stability control, ignition fade out
U-Bat
DME fades out the ignition and fuel injection (not in ASC+T)
Optional
TD
Engine speed signal (once per ignition cycle)
Square-wave signal
EML undertakes idle control and engine speed limitation. ASC requires this information to ensure it does not stall the engine. Instrument cluster requires this signal for tachometer.
Mandatory
ASC+T
Automatic stability control + traction
U-Bat = ON
With ASC+T is active, EGS prevents alternate gearshifts in transmission.
No
DKR
Throttle reduction
Square-wave voltage with fixed frequency and variable duty factor
EML reduces throttle opening angle
Optional
DKE
Throttle increase
Square-wave voltage with fixed frequency and variable duty factor
EML increases throttle opening angle
Optional
DKV
Set throttle value
Square-wave voltage with fixed frequency and variable duty factor
ASC/MSR receives information on the current status of pedal position sensor (driver requirement)