RING 1751225 - Caterpillar

Table 2
Implement ECM Connector J2 Contact Descriptions
No. Type Function
1 Switch to Battery Input/Sourcing Driver Enable Battery Positive
4 Sourcing Driver Return 2 A On/Off Return 1-3
5 Sourcing Driver Output Dual Tilt Solenoid (BL TIP)
6 Sourcing Driver Output Dual Tilt Solenoid (BL SGL Tilt)
24 PWM Input Joystick Lift Position Sensor
25 PWM Input Joystick Tilt Position Sensor
26 PWM Input Joystick Thumb Rocker
42 PWM Input Steering Oil Temperature
43 PWM Input Implement Pilot Pressure Sensor
45 Switch to Ground Input Joystick Push-Button # (N/C)
48 Switch to Ground Input Demand Fan Pressure Sensor
51 PWM Input Tilt Hydraulic Pump Pressure Sensor
56 CAN Data Link (+) CAN A HIGH
64 CAN Data Link (+) CAN B HIGH
65 CAN Data Link (-) CAN B LOW
67 CAN Data Link (+) CAN A HIGH
68 CAN Data Link (-) CAN A LOW
70 CAN Data Link(-) CAN A LOW 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 of the ECM are listed in Table 1 and Table 2.Temperature Sensors
Hydraulic Oil Temperature Sensor
Illustration 2 g03672236
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.Pressure Sensors
Fan Pump Pressure Sensor
Illustration 3 g03672238The 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.Fan Return Filter Bypass Switch
Illustration 4 g03672242The 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 in the closed position and the oil temperature is greater than 52° C (126° F) with the engine running.