Meritor Wabco Antilock Braking System - freightliner CENTURY CLASS S Driver Manual

phase, in which the idle speeds up to
1000 rpm, the engine will stop and start
automatically to keep the battery charged
and the engine oil warm.
IMPORTANT: The cruise control must be
turned on once the engine is idling. If it was
previously turned on, turn the cruise control
off, then turn it on again.
2. Activate thermostat mode, if equipped.
NOTE: When the system is in thermostat
mode, it is also in engine mode. It will con-
tinue to operate in engine mode even if ther-
mostat mode is turned off.
2.1
With the system in engine mode, set the
cab and sleeper heater or air conditioner
controls to the highest setting.
2.2
Turn on the thermostat by touching any of
the four buttons. See
The display will flash the current sleeper
temperature and the previous mode (cool-
ing or heating) selected. If the cab needs
to be cooled or heated, the cool/heat icon
will flash.
2.3 Choose either cool or heat by pressing the
Cool/Heat button. Make sure the selection
matches that of the cab controls.
IMPORTANT: If the heat or cool selection of
the thermostat does not match that of the
cab controls, the system will idle and cycle
excessively.
2.4 Select Fahrenheit or Celsius by pressing
and holding the MODE button until either
the "F" or "C" is displayed.
2.5 Select the temperature set point by press-
ing the up or down arrows, as applicable.
Holding the button will cause the display
to scroll up or down rapidly. When the de-
sired set point is displayed, release the
button. The set point is stored in memory.
2.6 Select the temperature comfort zone by
pressing the MODE button until the upper
and lower temperature limit icon is dis-
played. Then use the up or down arrow to
select one of the three comfort zones: 4°F
(2°C), 7°F (4°C), or 10°F (6°C).
Instruments and Controls Identification
Fig. 2.35.
3. To deactivate thermostat mode and return to just
engine mode, press and hold the MODE button
for three seconds.
4.
To shut down Optimized Idle completely, either
turn off the ignition or use the drive away feature.
The drive away feature allows the use of all the
engine features. Use the drive away feature as
follows:
4.1 If the engine is running: Release the park-
ing brakes or put the transmission in gear.
If the engine is not running: Start the en-
gine. Release the parking brakes or put
the transmission into gear.
4.2
Let the engine return to base idle. The
active light will turn off. Optimized Idle is
now disabled.
Meritor WABCO
Braking System
The Meritor WABCO Antilock Braking System (ABS)
is an electronic wheel speed monitoring and control
system that works with the standard air brake sys-
tem. ABS passively monitors vehicle wheel speed at
all times, and controls wheel speed during emer-
gency stops.
IMPORTANT: For proper ABS system operation,
do not change tire sizes. The sizes of the tires
installed during production are programmed into
the electronic control unit. Installing different-
sized tires could result in a reduced braking
force, leading to longer stopping distances.
ABS includes signal-generating tone wheels and sen-
sors located in the wheel hubs of each sensed
wheel. The sensors transmit vehicle wheel speed
information to an electronic control unit (located be-
hind the center dash). The control unit's main circuit
interprets the speed sensor signals and calculates
wheel speed, wheel retardation, and a vehicle refer-
ence speed. If the calculations indicate wheel lockup,
the main circuit signals the appropriate modulator
valve to reduce braking pressure. During emergency
braking, the modulator valve alternately reduces, in-
creases, or maintains air pressure supply in the
brake chamber to prevent front and rear wheel
lockup.
®
Antilock
2.30