Engines NOTE: Essential information regarding the opera- tion and care of Allison automatic transmissions is contained in the Allison Driver’s Handbook. Apply- ing the knowledge presented will not only make driving easier, but will give the maximum benefits Cruise Control The cruise control is activated by the CRUISE ON and SET/RESUME switches located on the instrument con- trol panel ( Fig. 4.3 ) or by optional PAUSE, RESUME, and SET buttons on the transmission shift knob ( Fig. 4.4 ). The minimum speed at which cruise control can be used on Mercedes-Benz, Caterpillar, and Cummins electronic engines is 30 mph (48 km/h).
On Detroit Die- sel engines, the minimum speed at which cruise control can be used is 35 mph (56 km/h). from an Allison-equipped vehicle.Maintenance lit- erature is also available for drivers of Allison- equipped vehicles who desire trouble-free perfor- mance and maximum life from their equipment. These maintenance books are available from any authorized Detroit Diesel engine distributor. 8. As with all engines, prolonged idling of Detroit Die- sel engines is not recommended. An idling engine wastes fuel and if left unattended, is also unsafe. NOTE:
On Caterpillar engines, the minimum and maximum speed cruise control set limits can be programmed by authorized personnel into the ECM personality module. A Detroit Diesel Electronic Control (DDEC) engine can be equipped to shut off automatically after a specified idling time. The vehicle transmission must be in neutral and the parking brake must be set for the automatic shutoff option to work. To start the engine, follow the normal start-up procedure. WARNING Do not engage the cruise control in heavy traffic or when road conditions are wet or slippery. Failure to follow this precaution could result in loss of vehicle control and possible property damage or personal injury.
Engines equipped with DDEC will idle fast when cold. As the engine warms up to operating tempera- ture, the idle speed will decrease. Warm the engine until idle speed is normal before operating the ve- hicle. CAUTION Do not attempt to shift gears without using the clutch pedal when the cruise control is engaged. 4.16