GF30.30-P-3001FA | Variable Speed Limiter, function | 21.2.08 |
ENGINE 271, 272, 646 in MODEL 203.7
as of Model Year 09 /AEJ 08
with CODE (440) Cruise control
Function requirements of Variable Speed Limiter in general
Circuit 61 ON (engine running)
CC (cruise control) coded in the EIS control unit (N73)
ESP not deactivated
Vehicle speed > 30 km/h
Parking brake not applied
Selector lever in "D" position (with automatic transmission)
CC [TPM] push button switch (S40/4) in Variable Speed Limiter position LIM indicator lamp is lit
If the CC push button is switched to the variable speed limiter, the cruise control is deactivated.
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Variable Speed Limiter, general
The Variable Speed Limiter enables the driver to set a maximum speed ranging from 30 km/h up to the maximum speed.
The variable speed limiter (also called the "Speedtronic") is an additional function of the cruise control, and is integrated in the ESP and BAS control unit (N47-5).
Variable Speed Limiter, function sequence
The signals from the CC [TPM] push button switch are detected by the steering column tube module (N80) and transmitted to the ESP control unit over the engine compartment CAN (CAN C).
The set maximum speed is transmitted to the instrument cluster (A1) from the ESP control unit over the engine compartment CAN.
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The acceleration/deceleration requests (to engage the engine control) are sent by the ESP control unit over the engine compartment CAN to the CDI control unit (N3/9) or ME-SFI control unit (N3/10).
A request to automatic transmission for shifting gears is transmitted to the ETC [EGS] control unit (N15/3) or to the electric controller unit (VGS) (Y3/8) over the engine compartment CAN.
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).
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Activation
Pulling or moving the CC [TPM] push button switch up or down activates the Variable Speed Limiter. At this time, 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 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.
If the variable speed limiter is activated, the LIM indicator lamp is lit and the selected maximum speed is shown on the multifunction display (A1p13) of the instrument cluster.
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Deactivation
The Variable Speed Limiter is deactivated by:
- Moving the CC [TPM] push button to the "OFF" position
- Switching to cruise control LIM indicator lamp Off
- Operating the service brake
- Operating the parking brake
- Selector lever in "N" or "R" position (with automatic transmission)
- ESP control intervention function
- deactivating ESP
- kickdown (operating the accelerator pedal >90 % and current speed <20 km/h different from the set maximum speed)
- Vehicle speed <30 km/h
- Clutch pedal actuated for less than 6 s (with manual transmission)
- Circuit 61 OFF (engine off)