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

GF30.30-P-3002G Permanent Speed Limiter, Function
ENGINE 642.8 in MODEL 463.306 /336 /346 up to 31.5.12
- as of Model Year 2011
/YoM 10
ENGINE 273 in MODEL 463.202 /222 /236 /237 up to 31.5.12
- as of Model Year 2009
/YoM 08
ENGINE 113 in MODEL 463.270 /271 up to 31.5.12
- as of Model Year 2009
/YoM 08
ENGINE 642.9 in MODEL 463.303 /340 /341 up to 31.5.12
- as of Model Year 2009
/YoM 08

Function requirements of Permanent Speed Limiter in general
^ Circuit 61 ON (engine running)
^ Function for cruise control in EIS control unit (N73) coded
^ Permanent Speed Limiter activated in the menu of the instrument cluster (A1)

Function sequence for Permanent Speed Limiter
The Permanent Speed Limiter allows the driver to set (limit) the maximum speed of the vehicle (e.g. for winter tires with a lower permissible maximum speed).
The Permanent Speed Limiter (also called the SPEEDTRONIC) is an additional function of the cruise control, which is integrated in the ESP control unit (N30/4).

The set maximum speed is transmitted from the instrument cluster to the ESP control unit over the drive CAN.
The ESP control unit sends the request to decelerate the vehicle via the drive CAN to the CDI control unit (N3/9) (for diesel engines) or to the ME-SFI [ME] control unit (N3/10) (for gasoline engines).
A switching request to the automatic transmission is transmitted via the drive CAN to the ETC control unit (N15/3) (for transmission 722.6) or to the fully integrated transmission control unit (VGS) (Y3/8n4) (for transmission 722.9).
The engine performance is reduced if 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 can be switched on/off on the instrument cluster, by selecting the "Settings" menu, "vehicle" submenu, "Limiting (winter tire)" menu item.
The maximum speed can be set in 10 km/h steps from 160 - 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.

The selected maximum speed is indicated on the multifunction display (A1p13) of the instrument cluster.

When the permanent speed limiter is active, the cruise control or variable speed limiter can be used up to the selected permanent maximum speed.