SLEEVE 2S5265 - Caterpillar

Inputs
The inputs describe the status of the machine systems. Two types of inputs exist. The inputs can be either a switch type or a sensor type. Switches provide an open, a ground, or a + battery signal to the inputs of the controller. Sensors (frequency, PWM, or voltage) provide a changing signal to the sensor inputs of the controller. The inputs to ECMs are listed in table .Temperature Sensors
Hydraulic Oil Temperature Sensor
Illustration 2 g03375133
Hydraulic Oil Temperature Sensor
The temperature sensor for the hydraulic oil informs the ECM of the temperature of the hydraulic system oil. The sensor is designed internally to change resistance based on the temperature of the hydraulic oil. The Implement ECM uses a pull up resistor to receive sensor voltage and convert the voltage to a temperature reading. The resistance range for this sensor is 33,650 ohms at −40° C (−40° F)to 18.6 ohms at 150° C (302° F).Pressure Sensors
Implement/Steering Pump Pressure Sensor
Illustration 3 g03375142The implement/steering pressure sensor sends a PWM signal to the Implement ECM indicating system pressure. The duty cycle of the signal will vary in proportion to the system pressure. These PWM signals are inputs to the Implement ECM.Switches
Switches provide one of the following types of inputs to the ECM:
Open
Ground
+BatterySwitches are devices that have two states, opened or closed.
When a switch is open, no signal is provided to the corresponding input of the ECM. This condition is also referred to as floating.
When a switch is closed, a ground signal or a +battery signal is provided to the ECM. Steering and Transmission Lock
Illustration 4 g03375229The switch tells the ECM when the operator has the lock lever in the locked position.
Table 4
Switch Status
Switch Position Normally Open Normally Closed
Locked Closed Open
Unlocked Open Closed Fan Return Filter Bypass Switch
Illustration 5 g03375146The bypass switch is a pressure switch that shows whether the filter is plugged and the filter is being bypassed. The fan return filter bypass switch is a normally closed switch. The bypass switch will close at 500 kPa (73 psi) differential pressure notifying the ECM that the filter is plugged. The hydraulic filter bypass switch provides a ground to the ECM when activated.This switch is one of the inputs that is used in order to drive the "system indicator" in the instrument cluster. This indicator is turned ON when the switch is