The engine brake will only operate when the accel-
erator pedal is fully released. Disengaging the clutch
will prevent the engine brake from operating.
Vehicles equipped with antilock braking systems
(ABS) have the ability to turn the engine brake off if
a wheel-slip condition is detected. The engine brake
will automatically turn itself back on once the wheel
slip is no longer detected. The DDEC VI system will
deactivate the engine brake system when the engine
speed falls below 1000 rpm or when the vehicle
slows down to a preset speed, depending on DDEC
programming. This prevents stalling the engine.
Power Takeoff (PTO) Governor
Front Engine Power Take Offs (PTO) are devices
used to tap into engine power to run auxiliary de-
vices. Common uses are vehicles with hydraulic
pumps which power additional equipment. The fol-
lowing instructions are general guidelines for operat-
ingaPTO.
1.
Set the parking brake. Shift the transmission to
neutral.
2.
Press the dash PTO switch. Release the switch
when the light begins to blink.
When the light comes on steadily, the PTO is
engaged and ready to operate. In stationary
mode, the vehicle must remain in neutral with the
parking brake set.
3.
To activate the mobile mode, shift from neutral to
reverse, 1st, or 2nd gear. The clutch will open
and the PTO will disengage for a moment.
4.
Touch the throttle pedal to close the clutch and
engage the PTO in mobile mode. The PTO may
be operated with the transmission in the follow-
ing gears only: R-N-1-2.
NOTE: Do not attempt to change gears while
the vehicle is moving. The transmission will ig-
nore the request.
5.
To end the mobile mode, bring the vehicle to a
stop. The clutch will open and shut off power to
the PTO.
6.
To resume stationary mode, shift to neutral. The
PTO will engage.
7.
To end stationary mode, press the dash switch.
When the light in the switch goes out, power to
the PTO is shut off. Shut down the engine.
Optimized Idle®
The optimized idle option on Detroit Diesel engines is
a system that automatically stops and restarts the
engine to accomplish the following:
•
Keep the engine oil temperature between 60
and 104°F (16 to 40°C)
•
Keep the battery charged
•
Keep the cab or sleeper at a constant, desired
temperature (if equipped with a thermostat)
The benefits of the system include reduced engine
idle time, fuel savings, reduction of exhaust emis-
sions and noise, increased starter and engine life,
and less chance of dead batteries due to electrical
loads.
Optimized Idle operates in two modes; the engine
mode or the thermostat mode. The engine mode
keeps the battery charged and the engine oil tem-
perature within factory set limits. The thermostat
mode is the same as the engine mode, but also
keeps the cab and sleeper at a constant preset
temperature.
The engine mode is always activated when the sys-
tem is operated. The thermostat mode is activated
when the thermostat is turned on.
The thermostat mode controls the set point, which is
the desired temperature of the cab and sleeper, and
the comfort zone, which is the number of degrees
from the set point before the engine needs to heat or
cool the cab. There are three comfort zones: 4°F
(2°C), 7°F (4°C), or 10°F (6°C).
Vehicles equipped with Optimized Idle have a label
on the dash, and a telltale lens in the dash message
center. See
Fig. 10.6 for the dash label detail. See
Chapter 4 for the appropriate dash message center.
If equipped with the thermostat mode, a thermostat is
located in the sleeper, above the bunk. See
Fig. 10.7.
The thermostat consists of an LCD readout and four
buttons.
The display normally shows the temperature of the
sleeper, but changes accordingly as the buttons are
pressed.
The button functions are as follows:
•
Up Button: increases the set point and comfort
zone.
Optional Engine Systems
10.5
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