PIN 1535396 - Caterpillar

Inputs
The machine has several different types of input devices. The ECM receives machine status information from the input devices and determines the correct output action that is needed in order to control machine operations based on memory and software parameters. The machine utilizes the following types of inputs: switch type and sensor type.Switches provide signals to the switch inputs of the ECM. The possible outputs of a switch are listed: an open signal, a grounded signal and + battery signal.Sensors provide an electrical signal to the ECM that constantly changes. The sensor input to the ECM can be one of several different types of electrical signals such as: pulse width modulated (PWM) signals, voltage signals and frequency input signals. Each possible input to the ECM is listed in the tables for the 70-pin connectors.Inputs provide information to the ECM in the form of sensors or switches.Sensors
Sensors provide information to the ECM about the intent of the operator or changing conditions. The sensor signal changes proportionally to the changing of operator input or changing conditions. The following types of sensor signals are used by the ECM.Frequency - The sensor produces a signal and the frequency (Hz) varies as the condition changes.Pulse width modulated - The sensor produces a signal. The duty cycle of the signal varies as the condition changes. The frequency of this signal is constant.Analog - The ECM measures the voltage that is associated to a specific condition of the control.Hook and Boom Motor Pressure Sensors
Illustration 2 g03346558The hook and boom motor pressure sensors are active analog sensors. The sensors send output voltages that are proportional to the pressure that is being sent to the hook and boom motors.Hook and Boom Motor Speed Sensors
Illustration 3 g03376774The hook and boom motor speed sensors are active frequency sensor. There are two proportional frequency signals produced by the sensor. The sensor detects the passing of a timing gear, and converts the speed of the timing gear into a frequency signal. Based on the signals the ECM receives from the sensor, the ECM can determine the speed of the hook or boom motor.Implement Control Handle
Illustration 4 g03869125The ECM receives signals from the implement control handle as pulse width modulated signals. These signals are operator requests for winch movement such as RAISE, LOWER, for the hook, or RAISE, LOWER, for the boom. In most cases, the ECM will respond to the duty cycle of the pulse width modulated signal by sending a corresponding pulse width modulated signal to the related solenoids. The ECM relates a specific sensor duty cycle value to a specific control handle position. The ECM determines the correct solenoid output based on a "software map" that is contained in the programmable memory of the ECM. The ECM receives signals from a position sensor on the X-axis and a position sensor on the Y-axis.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