Driver Controls and Instruments mounted to the left of the ignition switch, and provides the driver with an extra 30 seconds of engine operating time. Once the engine has shut down, cycle the ignition key off and then on, and press the "Override/Chk" switch to restart the engine. Standard DDEC III ® systems will shut down the engine if sensors indicate an emergency engine condition such as low coolant level, high coolant temperature, high oil temperature, or low oil pressure. If such a condition oc- curs, the yellow CHECK ENGINE light in the warning and indicator light module will come on.
If the problem gets bad enough to cause possible engine damage, the DDEC III will gradually cut engine power down to 70 percent of original power. At that point, the red engine protection (ENG PROTECT) light will come on, and 30 seconds later, DDEC III will shut down the engine (if programmed). The cruise control and PTO governor options are con- trolled in two ways: 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 DDEC III detects low oil pressure, both the check en- gine and engine protection lights will come on and the engine will shut down in 30 seconds (if programmed). Parking Brake Control Valve and Trailer Air Supply Valve On Vehicles With Trailer Air Brake Hookup NOTE:
If the vehicle is in a hazardous place when the "Shutdown Engine" light illuminates, the driver must immediately press the "Override/Chk" switch or the engine will shut down in 30 seconds. Press- ing the switch will give the driver an additional 30 seconds to move the vehicle. If this is still not enough time, the driver must press the switch again for another 30-second delay before engine shutdown. The yellow diamond-shaped knob operates the parking brake valve. See Fig. 3.16 . Pull the knob out to apply both the tractor and the trailer spring parking brakes. Push the knob in to release the tractor spring parking brakes.
Before the spring parking brakes can be re- leased, the air pressure in either air brake system must be at least 65 psi (447 kPa). 3.13