PLATE 6G0505 - Caterpillar

Travel Control Pedal Position Sensor
Illustration 9 g03373852
The travel control pedal position sensor is an active pulse width position sensor. The sensor sends a pulse width modulated signal to the ECM. The signal allows the ECM to determine the operator input request for ground speed reduction based on the position of the pedal.Thumbwheel Sensor
Illustration 10 g03373957
The thumbwheel sensor is an active pulse width modulated sensor. The sensor sends a pulse width modulated signal to the ECM. The duty cycle of the signal is proportional to the position of the thumbwheel. The signal allows the ECM to determine the operator input request for ground speed.Forward Neutral Reverse Selector
The forward neutral reverse (FNR) selector generates two PWM signals. Based on the duty cycle of the two signals, the ECM determines the operator request for forward, reverse, or neutral.Switches
Switches provide an open signal, a ground signal, or a +battery signal to the inputs of the ECM. Switches are open or closed.
When a switch is open, no signal is provided to the corresponding input of the ECM. This "no signal" condition is also called "floating".
When a switch is closed, a ground signal or a +battery signal is provided to the corresponding input of the ECM.Parking Brake
Illustration 11 g03372717
The parking brake switch is a two position switch with a normally open contact and a normally closed contact. The contacts provide switch to ground inputs to the ECM. Through these contacts, the ECM can determine if the operator has engaged or disengaged the parking brake switch. The parking brake switch directly controls the action of the parking brake system, by either opening or closing the driver side circuit on the brake solenoid.Speed Set/Recall Switch
Illustration 12 g03373911
The speed set/recall switch is a momentary switch with a normally open contact and a normally closed contact. The contacts provide switch to ground inputs to the ECM. Through these contacts, the ECM can determine if the switch is depressed or not. The ECM then uses internal programming to control the speed set/recall feature based on the operation of the switch.Outputs
The ECM responds to decisions by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or the service technician.Proportional Solenoids
Brake Solenoid
Illustration 13 g03372925
The brake solenoid is designed to control the flow of brake oil to the brakes. The brakes are spring applied and hydraulically released. When the solenoid is not engaged or receiving a low duty cycle signal, the solenoid does not allow brake oil to disengage the brakes. As the duty cycle of the signal to the solenoid increases, the solenoid allows some flow and the brakes begin to release. When the duty cycle of the signal to the solenoid is at the maximum, the flow of brake oil fully releases the brakes. The engagement of the brakes is inversely proportional to the duty cycle of the signal sent by the ECM.Note: The solenoid coils are not designed to operate using 24 DCV directly. The ECM sends a PWM signal of 24