Driver Controls and Instruments light in the lightbar located below the speedometer and tachometer. With the ignition switch on, both lights come on for about two seconds, then, if there is no problem with the CELECT engine system, the lights will go out. Whenever there is a problem within the elec- tronic engine system, one of the lights will come on and stay on as long as the problem exists. operation, the CRUISE ON switch turns on the PTO, and the SET/RESUME switch is used to either select or resume the engine operating speed. The SET/RESUME switch is spring-loaded to return to neutral. See Chap- ter 4 for complete instructions.
The optional PAUSE, RESUME, and SET buttons on the transmission shift knob. See Fig. 3.15 . The PAUSE button allows the driver to temporarily interrupt cruise control. The RESUME button allows the driver to re- sume the cruise speed after slowing down. The SET button allows the driver to select the cruise speed. For PTO operation, the PAUSE button temporarily interrupts PTO operation, the RESUME button resumes PTO op- eration at the previously selected engine speed, and the SET button is used to select the engine operating speed. See Chapter 4 for complete instructions.
If the yellow check engine light illuminates while driving some CELECT features will not work, but the vehicle can still be driven. If the red stop engine light illumi- nates while driving and if the engine will not accelerate, pull off of the road and shut down the engine. In either situation, have the problem repaired as soon as pos- sible. If the system is programmed to shut down, the engine will shut down 30 seconds after the red engine protec- tion light illuminates. The ignition switch will restart the engine after shutdown. However, if the potentially dam- aging problem still exists, the engine will operate at the reduced speed or torque level allowed just prior to shut- down.
Detroit Diesel Electronic Engine Control (DDEC) Operator Control The DDEC system is centered around a computer that is programmed to automatically control engine timing and fuel injection, providing maximum engine perfor- mance and fuel economy. The cruise control and PTO governor options are con- trolled in two ways: The CRUISE ON and SET/RESUME switches on the instrument control panel. See Fig. 3.14 . The CRUISE ON switch turns on the cruise control, and the SET/ RESUME switch is used to select the cruise speed, or to resume cruise control after slowing down. For PTO Some DDEC II ® systems have an automatic engine shutdown option.
This option will shut down the engine if potentially damaging conditions are detected. An over- ride switch (on DDEC II engines, this switch is labelled "Override") is provided for emergency situations. It is 3.12