Speed Control - Mercedes-Benz 2005 Sprinter Service Manual

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SPEED CONTROL

DESCRIPTION
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OPERATION
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SPECIFICATIONS
TORQUE
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CABLE
DESCRIPTION
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SPEED CONTROL
DESCRIPTION
The speed control system is electronically con-
trolled by the Engine Control Module (ECM). A
cable and a vacuum controlled servo are not
used. This is a servo-less system. Control of the
system is accomplished by a 4-position, instrument
panel mounted switch (Fig. 1).
Switch settings (Fig. 2) are:
• 1. Set / Accelerate
• 2. Resume Set Speed
• 3. Set / Decelerate
• 4. Off
The system is designed to operate at speeds above
25 mph (40 km/h).
WARNING: THE USE OF SPEED CONTROL IS NOT
RECOMMENDED WHEN DRIVING CONDITIONS DO
NOT PERMIT MAINTAINING A CONSTANT SPEED,
SUCH AS IN HEAVY TRAFFIC OR ON ROADS THAT
ARE WINDING, ICY, SNOW COVERED, OR SLIP-
PERY.
OPERATION
When speed control operation is selected by the
speed control switch, the ECM (Engine Control Mod-
ule) allows a set speed to be stored in its RAM for
speed control. To store a set speed, press either of the
SET switch functions while the vehicle is moving,
and above 25 mph (40 km/h). In order for the speed
control to engage, the brakes cannot be applied, nor
can the gear selector be indicating the transmission
is in Park or Neutral.
The speed control can be disengaged manually by:
• Stepping on the brake pedal
• Pressing the speed control switch to OFF
• Depressing the clutch pedal (if equipped).
SPEED CONTROL
TABLE OF CONTENTS
page
SERVO
DESCRIPTION
SWITCH
REMOVAL
INSTALLATION
1 - COVER
2 - BEZEL
3 - INSTRUMENT CLUSTER
4 - STEERING WHEEL
5 - MULTI-FUNCTION SWITCH
6 - SPEED CONTROL SWITCH
NOTE: Depressing the OFF switch or turning off the
ignition switch will erase the set speed stored in
the ECM.
For added safety, the speed control system is pro-
grammed to disengage for any of the following condi-
tions:
• An indication of Park or Neutral
• A rapid increase rpm (indicates that the clutch
has been disengaged)
• Excessive engine rpm (indicates that the trans-
mission may be in a low gear)
• The speed signal increases at a rate of 10 mph
per second (indicates that the coefficient of friction
between the road surface and tires is extremely low)
• The speed signal decreases at a rate of 10 mph
per second (indicates that the vehicle may have
decelerated at an extremely high rate)
SPEED CONTROL 8P - 1
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Fig. 1 INSTRUMENT CLUSTER
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