Gen 5 DD Platform Operators Manual In general, when using a 7- or 9-speed transmission, the operator should always downshift between 1150 and 1250 rpm for the DD13 and between 1000 and 1100 rpm for the DD15. This is true even on steep grades with heavy loads. When using an 18-, 15-, or 13-speed transmission, the operator will need to downshift at an rpm that allows "less than rated" rpm before throttle application in the next gear down. The operator may want to limit engine speed to 1900 rpm in all gears as fuel economy is not as efficient above 1800 rpm.
Vehicle Emergency Operation Emergency Running Mode Detroit™ Gen 5 Heavy Duty engines are equipped with Detroit Diesel Electronic Control® (DDEC®) which monitors and controls the Detroit™ powertrain functions and operation. As soon as an engine fault is detected, it is evaluated and one of the following measures is initiated. DDEC® will turn on an instrument panel indicator when certain predetermined conditions are present. If the fault is serious enough to impair normal operation, DDEC ® switches over to a limp mode. The limp speed is dependent on engine control parameters and could be as low as 1000 rpm.
This allows the operator to safely move the vehicle to a service location or a safe stopping area. To prevent possible serious equipment damage, have any faults corrected immediately by an authorized Detroit™ service outlet. Emergency Jump Starting The engine's electronic system operates on 12 volts DC. If a Detroit™ Gen 5 Heavy Duty engine requires emergency jump starting, do not exceed 16 volts DC as this may damage the MCM and or other electrical equipment. Before attempting to jump start the engine, the jumper cables must be connected using the sequence of first, positive-to-positive, and then last, negative-to-chassis or suitable ground.
Reversing battery polarity may damage the electrical equipment. Failure to connect jumper cables in the proper sequence can result in alternator and/or equipment damage. Stop Engine Override Option The engine shutdown feature is designed to prevent engine damage from occurring; extending the engine run time during an engine shutdown could cause engine damage. The Stop Engine Override feature allows the operator to override the automatic stop engine sequence. Only use the Stop Engine Override during emergency situations where moving the vehicle to a safe location is critical. The All information subject to change without notice. 31 DDC-SVC-MAN-0217 Copyright © 2022 DETROIT DIESEL CORPORATION