DDEC V ENGINE DRIVING TIPS 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. speed in one mile-per-hour (1.6 kilometer-per-hour) increments, press the Resume/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 pressing the service brakes, clutch pedal, or trailer brake. The On/Off Switch will also deactivate Cruise Control. The ECU 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 V to see a status change to allow Cruise Control activation. The status of DDEC V inputs to activate Cruise Control at key ON is listed in Table 1. Cruise Control will maintain vehicle speed even on up grades, unless power requirements demand a downshift. And, of course, Cruise Control does not limit 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. Once Cruise Control is enabled and you reach your road speed, press the Set Switch to activate Cruise Control. The cruise light will come on. To increase road Table 1 Input Status to Activate Cruise Control 36 All information subject to change without notice. DDC-SVC-MAN-0039 Copyright © 2009 DETROIT DIESEL CORPORATION Input Status of Input at Key ON Status of Input Before Cruise Control Activates Service Brake Switch ON OFF Clutch Release Switch (Manual Trans only) ON OFF Cruise Control Enable Switch OFF ON