User Manual

DDEC IV SYSTEM
When the Cruise Control switch
is in the ON position, cruise
control is engaged by momentarily
contacting the “Set/Coast” switch
to the ON position. Holding the
switch in the ON po si tion all ows the
vehicle to slow to a lower speed.
Toggling the switch will result in a
one mile-per-hour (1 .6 kph) decrease
in vehicle speed. If cru ise control
has been disabled, toggling the
“Resume/Accel” switch restores the
vehicle to the previously set cruise
speed.
Using either the brake or the clutch
will disable cruise control.
Engine Brakes
Engine brakes are enabled by an
ON/OFF switch mounted on the dash.
A separate intensity switch is used to
select low, medium or high braking
power. The engine brakes will only
operate when the electronic foot pedal
assembly (EFPA) is fully released.
Disengaging the clutch will prevent
the engine brakes from operating.
Engine brakes will su pply braking
power even when in cruise control.
The electronic con trol module (ECM)
will control the amount of engine
braking with respect to the cruise
control set speed. The maximum
amount of braking (low, medium, high)
is selected wi th the dash switch e s.
LOSS OF VEHICLE CONTROL
To avoid injury from loss of
vehicle control, do not activate
the Engine Brake system under
the following conditions:
□ On wet or slippery pavement,
unless the vehicle is equippe d
with ABS (anti-lock braking
system) and you have had
prior experience driving
under these conditions.
□ When driving without a trailer
(bobtailing) or pulling an
empty trailer.
□ If the tractor drive wheels
begin to lock or there is
fishtail motion after the
Engine B rak e is activated,
deactivate the brake system
immediately if this occurs.
26 All information subject to change without notice. (Rev. 01/04)
DDC-SVC-MAN-0058 Copyright © 2004 DETROIT DIESEL CORPORATION