GF30.30-P-3002GQ Permanent Speed Limiter, Function

GF30.30-P-3002GQ Permanent Speed Limiter, Function
- with CODE (219) Distronic (DTR)
- as of model year 09


Function requirements of Permanent Speed Limiter in general
^ Circuit 61 ON (engine running)
^ CC [TPM] (cruise control) coded in central gateway control unit (N93)

Permanent Speed Limiter, general
The Permanent Speed Limiter (also called the SPEEDTRONIC) is an additional function of the Distronic, which is integrated in the ESP control unit (N47-5).

The Permanent Speed Limiter allows the driver to limit the maximum speed of the vehicle (e.g. for winter tires with a lower permissible maximum speed).

The set maximum speed is transmitted from the instrument cluster (A1) to the ESP control unit over the engine compartment CAN.

The ESP control unit sends the request to decelerate the vehicle via the engine compartment CAN to the CDI control unit (N3/9) (for diesel engines) or to the ME-SFI [ME] control unit (N3/10) (for gasoline engines).

Shift requests to the automatic transmission are transmitted by the ESP control unit over the engine compartment CAN to the electric controller unit (VGS) (Y3/8).

Permanent Speed Limiter function sequence
Engine power is reduced as the vehicle approaches the set maximum speed.
If this is inadequate, the service brake is actuated proportionately and if necessary, the automatic transmission shifts to a lower gear so that the set maximum speed is not exceeded (e.g. in case of steep declivity).

The Permanent Speed Limiter is switched on/off using the LH or RH multifunction steering wheel button group (S110, S111) with the "Settings" menu, sub-menu "Vehicle",menu item "Speed limiting (winter tires)" on the instrument cluster.

The maximum speed can be set in 10 km/h increments from 160 to 240 km/h.

If the Permanent Speed Limiter is switched on, it is activated at the same time and can be switched off or deactivated again only through the menu in the instrument cluster.

A warning message is displayed in the multifunction display (A1p13) at about 10 km/h under the set maximum speed.

While the Permanent Speed Limiter is active, the Distronic PLUS or Variable Speed Limiter (except code (494) USA version) can be use independently of the set maximum speed, up to a maximum of 200 km/h.