Variable Speed Limiter, function - GF30.30-P-3001LEB

ENGINES 156, 273, 275 in MODEL 216 up to 31.8.10 with CODE (440) Cruise control except CODE (494) USA version as of model year 2009/YoM 08

ENGINES 156, 272, 273, 275, 642, 629 in MODEL 221 up to 31.8.10 with CODE (440) Cruise control except CODE (494) USA version as of model year 2009/YoM 08

View of instrument cluster (A1) with Variable Speed Limiter activated

Fig 1: Identifying Variable Speed Limiter Activated - Instrument Cluster Display

Courtesy of MERCEDES-BENZ USA

Function requirements of Variable Speed Limiter in general

Circuit 61 "ON" (engine running)
CC [TPM] (cruise control) coded in central gateway control unit (N93)
Electronic Stability Program (ESP) not deactivated
Vehicle speed 30 km/h
CC [TPM] push button (S40/4) in variable speed limiter position (LIM indicator lamp (LIMI TER) is lit)

Variable Speed Limiter, general

The Variable Speed Limiter (also known as a LIMITER or SPEEDTRONIC) is an additional cruise control function that is integrated into the ESP control unit (N47-5) or the recuperative braking system control unit (N30/6) (with hybrid).

The Variable Speed Limiter allows the driver to set his/her own maximum speed, in a range from 30 km/h up to vehicle maximum speed.

The signals from the CC [TPM] push button are detected by the steering column tube module (N80) and via the chassis CAN (CAN E) to the ESP control unit or to the RBS control unit (for HYBRID).

The set maximum speed is sent by the ESP control unit or by the recuperative braking system control unit (for HYBRID) via the chassis CAN and backbone CAN (CAN F) to the IC (A1).

The requests for acceleration or deceleration (for engine control intervention) are sent by the ESP control unit or the recuperative brake system control unit (with hybrid) via the chassis CAN to the CDI control unit (N3/9) (with diesel engine) or to the ME-SFI [ME] control unit (N3/10) (with gasoline engine).

A switching request at the automatic transmission is transmitted from the ESP control unit or from the RBS control unit (for HYBRID) via the chassis CAN and drive train CAN (CAN C) to the EGS control unit (N15/3) (for mechanism 722.6) or to the electric controller unit (VGS) (Y3/8) (for transmission 722.9).

Function sequence for Variable Speed Limiter

The function sequence is described in the following steps:

Function sequence for maximum speed
Function sequence for activation
Function sequence for deactivation

Function sequence for maximum speed

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).

Function sequence for activation

Pulling or moving the CC [TPM] switch up or down activates the Variable Speed Limiter. In this way the current vehicle speed is set as the maximum speed and moving the CC [TPM] push button switch increases or decreases it.

The CC [TPM] switch can be moved up or down to different degrees to increase or reduce the maximum speed in 1 km/h or 10 km/h increments (two settings).

If the Variable Speed Limiter is activated at a speed of <30 km/h, the maximum speed is automatically set to 30 km/h.

When the Variable Speed Limiter is activated, the segments in the speedometer arc are illuminated from the beginning of the scale up to the set maximum speed. The set maximum speed is marked with an orange-colored triangle.

If the CC push button is switched to the variable speed limiter, the cruise control is deactivated.

Function sequence for deactivation

The Variable Speed Limiter is deactivated if:

The CC [TPM] switch is pushed forwards
Pressing the CC [TPM] switch induces a switchover to the cruise control (LIM indicator lamp off)
Kickdown is activated (accelerator pedal pressed > 90% and driven speed <20 km/h away from set maximum speed)
Circuit 15 OFF (ignition OFF)

Component description for instrument cluster	A1 Model 216.3, 221.0/1 except 221.095/195 HYBRID	GF54.30-P-6000LE
Component description for instrument cluster	Model 221.095/195 HYBRID	GF54.30-P-6000LEH
Component description for CDI control unit	N3/9 Model 221.0/1 with engine 629.9	GF07.16-P-6000OA
Component description for CDI control unit	Model 221.0/1 with engine 642.9	GF07.16-P-6000OHL
Component description for ME-SFI [ME] control unit	N3/10 Model 216.3, 221.0/1 with engine 156	GF07.61-P-6000MAS
	Model 221.0/1 with ENGINE 272 except model 221.095/195 HYBRID with engine 272.974	GF07.61-P-6000MIS
	Model 221.095/195 HYBRID with engine 272.974	GF07.61-P-6000MEH
	Model 216.3, 221.0/1 with engine 273	GF07.61-P-6000MLS
	Model 216.3, 221.1 with engine 275	GF07.61-P-6000MOS
Component description for electronic transmission control unit	N15/3 Model 216.3, 221.1 with transmission 722.6	GF27.60-P-5164ACS
Component description for regenerative braking system control unit	N30/6 Model 221.095/195 HYBRID	GF42.22-P-1100LEH
Component description for ESP control unit	N47-5 Model 216.3, 221.0/1 except 221.095/195 HYBRID	GF42.45-P-5118LE
Component description for fully integrated transmission control unit	Y3/8n4 Model 216.3, 221.0/1 with transmission 722.9	GF27.60-P-5165AHS