Operators Manual

Table Of Contents
Engine speed and power are varied under Cruise Control to maintain the set vehicle
speed. The vehicle speed must be above Min Cruise Set Speed and below Max
Cruise Set Speed. It is recommended that Max Cruise Set Speed be set to the
default to allow proper operation of other features such as Fuel Economy Incentive
and PasSmart. The Vehicle Speed Limit should be used to limit vehicle throttle
speed.
Turn the switch ON to energize the system. Remember as a check after each engine
start, DDEC looks for a one-time activation of the clutch (if equipped) and service
brake before DDEC allows Cruise Control to be enabled.
DDEC must also see or recognize that the Cruise Enable Switch has changed. If the
Cruise Enable Switch is OFF it needs to be turned ON. If the Cruise Enable Switch
is left in the ON position at key OFF, the switch must be cycled OFF then ON for
DDEC to see a status change to allow Cruise Control activation. The status of
DDEC inputs to activate Cruise Control at key ON is listed in the following table.
Table 6.
Input Status to Activate Cruise Control
Input Input Status at Key ON
Input Status Before Cruise
Control Activates
Service Brake Switch ON OFF
Clutch Release Switch
(Manual Trans. only)
ON OFF
Cruise Control Enable Switch OFF ON
DD Heavy Duty Platform Operators Manual
All information subject to change without notice. 73
DDC-SVC-MAN-0189 Copyright © 2022 DETROIT DIESEL CORPORATION