User Manual

DDEC IV ENGINE DRIVING TIPS
Turn the switch ON to energize th e
system. When you reach your road
speed, press the “Set” switch to
activate cruise control. T he cruise
light will come on. To increase
road speed in one mile-per-hour
(1.6 kilometer-per-hour) incremen ts,
press the “R esume/Accel” switch. To
reduce road speed, press and hold the
“Set/Coast” switch until the lower
speed is reached.
Cruise control is deactivated by
slightly depressing the service brakes,
clutch pedal, or trailer brake. The
“On/Off” sw itch will also deactivate
cruise control.
Cruise control will maintain vehicle
speed even on up grades, unless p ower
requirements demand a do wnshift.
And, of course, cruise control does
not lim it your speed on down grades.
Most likely, cruise control will feel
stronger than driving with the foot
pedal because of the instantaneous and
wide-open throttle response. That's
why cruise control use is not suggested
during slippery driving conditions.
Usecruisecontrolafterdown
shifting on a hill to pull the hill.
Hitting the “Resume” switch (not
the “Set” switch) will keep the truck
accelerating in the lower gears up to
the rated engine speed.
Cruise control will disengage below
11 00 rpm or 20 mph (32 kph) road
speed. When using cruise control,
if you want to pull the engine below
11 00 rpm, remember to hold the
throttle pedal to the floor to keep the
engine pulling at wide-open thro ttle.
Realistically, the engine will pull to
about 1050 rpm.
Remember: The electronic data
programmed int o th e ECM w ill
not allow you to hurt or overfuel
theengineatlowor“lug”engine
speeds. There is enough oil pressure
to withstand hard pulls at low engine
speeds.
38 All information subject to change without notice. (Rev. 01/04)
DDC-SVC-MAN-0058 Copyright © 2004 DETROIT DIESEL CORPORATION