![]() The ECM receives commands from the Cat ET in order to change the operating modes.The data link consists of the following parts: internal ECM circuits, the related harness wiring, the service tool connector and the connector for the product link. The bidirectional link allows the ECM to input information and output information. Note: The control for the product link provides a global positioning system for the machine. A data link connection is provided for the product link. ![]() The data link uses the connector for the service port in order to communicate with the Caterpillar Electronic Technician. The Cat Data Link is an input/output of the ECM. The transmission ECM receives battery (+) voltage from the ignition switch in the (RUN), (START), and (AID) positions. The ignition switch is a four position, two contact switch. Sensors (frequency, PWM, or voltage) provide a changing signal to the sensor inputs of the controller. Switches provide an open, a ground, or a + battery signal to the inputs of the controller. The inputs can be either a switch type or a sensor type. The inputs describe the status of the machine systems. Parking brake Cab Switch (N/O) Parking Brake Oil Pressure Sensor ![]() ![]() Show/hide table Table 2 Transmission ECM J2 Contact Descriptions ![]()
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