ELECTRICAL SYSTEM CONTINUED
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
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 switch to + battery signals, switch to ground signals, analog
pulse width modulated (PWM) signals, and frequency input signals.
The ECM sends electrical signals through the outputs. The outputs can create an action or the outputs can provide
information to the ECM. The ECM can send output signals to the system components in one of several different
electrical signal types such as: driver outputs, sinking driver outputs, sensor power supply outputs, and data link
Each ECM uses the Data Link to communicate with the other. The data link is bidirectional. The data link allows the
ECM to receive or send information. The data link allows the sharing of information with the engine electronic
The ECM supports two types of data link systems:
CAN Data Link