SERIES 60 ON-HIGHWAY ENGINE OPERATOR'S GUIDE 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. 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. The ECU must also 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 on, it must be turned off then on for cruise to operate.
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 equipped 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. Holding the switch in the ON position allows 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 Cruise Control has been disabled, toggling the Resume/Accel Switch restores the vehicle to the previously set cruise speed.
If the tractor drive wheels begin to lock or there is fishtail motion after the Engine Brake is activated, deactivate the brake system immediately if this occurs. Using either the brake or the clutch will disable Cruise Control. The engine brakes will only operate when the Accelerator Pedal is fully released. Disengaging the clutch will prevent the engine brakes from operating. Engine Brakes Engine brakes are enabled by a dash-mounted On/Off switch with a separate intensity switch to select low, medium or high braking power. All information subject to change without notice. 25 DDC-SVC-MAN-0039 Copyright © 2009 DETROIT DIESEL CORPORATION