Instruments and Controls Identification All Caterpillar electronic engines have an engine check light in the lightbar located above the speed- ometer and tachometer. This warning light comes on or flashes if the engine oil pressure is low, the cool- ant temperature is high, the intake manifold air tem- perature is high, the coolant level is low (optional), or whenever there is a problem within the electronic engine system. Some vehicles equipped with Cater- pillar electronic engines have an automatic engine shutdown option. This option will shut off fuel to the engine if potentially damaging conditions are de- tected.
See the engine manufacturer’s service litera- ture for troubleshooting procedures. tronic engines are controlled by a microprocessor- based computer. This computer controls specific en- gine and vehicle speed modes of operation to maximize vehicle fuel economy and performance. Vehicles with these engine systems have a yellow engine check light and a red engine stop light in the lightbar located above the speedometer and tachom- eter. With the ignition switch on, both lights come on for about two seconds; then, if there is no problem with the engine system, the lights will go out.
When- ever there is a problem within the electronic engine system, one of the lights will come on and stay on as long as the problem exists. The cruise control and PTO governor options are controlled in one of two ways: If the yellow engine check light comes on while driv- ing, some features will not work, but the vehicle can still be driven. If the red engine stop light comes on while driving, and if the engine will not accelerate, pull off of the road and shut down the engine. In ei- ther situation, have the problem repaired as soon as possible. By two switches on the instrument control panel ( Fig. 2.5 ).
The "On/Off" switch turns on the cruise control option, and the spring-loaded "Set/Resume" switch selects the cruise speed or resumes cruise control after slowing down. For PTO operation, the "On/Off" switch turns on the PTO, and the "Set/ Resume" switch either selects or resumes the engine operating speed. With the CELECT IV system—if the system is pro- grammed to shut down—the engine shuts down 30 seconds after the red engine stop light comes on. The ignition switch will restart the engine after shut- down, but if the potentially damaging problem still exists, the engine will operate at the reduced speed or torque level allowed just prior to shutdown.
To check whether a vehicle is equipped with CELECT or with CELECT IV, see the vehicle service manual. By three optional buttons on the transmission shift knob ( Fig. 2.6 ). The "Pause" button allows the driver to temporarily interrupt cruise control. The "Resume" button allows the driver to resume 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 opera- tion, the "Resume" button resumes PTO operation at the previously selected engine speed, and the "Set" button is used to select the engine operating speed. See Chapter 7 for complete instructions.
The cruise control and PTO governor options are controlled in one of two ways: By two switches on the instrument control panel ( Fig. 2.5 ). The "On/Off" switch turns on the cruise control option, and the spring-loaded "Set/Resume" switch selects the cruise speed or resumes cruise control after slowing down. For PTO operation, the "On/Off" switch turns on the PTO, and the "Set/ Resume" switch either selects or resumes the engine operating speed. BrakeSaver Control, Optional The BrakeSaver (optional on Caterpillar C-15 en- gines) is operated by a lever mounted in the cab. The lever controls the amount of oil being directed through the BrakeSaver.
The time required to fill the BrakeSaver with pressure oil to the point of maxi- mum braking in the BrakeSaver is about 1.8 sec- onds. or By three optional buttons on the transmission shift knob ( Fig. 2.6 ). The "Pause" button allows the driver to temporarily interrupt cruise control. The "Resume" button allows the driver to resume 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 opera- tion, the "Resume" button resumes PTO operation at the previously selected engine speed, and the "Set" Cummins PACE and CELECT Electronic Engines, Operator Control Cummins PACE, CELECT, and CELECT IV are elec- tronic fuel control systems installed on model L10 and, for PACE only, Big Cam IV engines. These elec- 2.5