561N, 572R Series II and 572R Pipelayers and D10R, D11R, D5M, D5N, D6M, D6N, D6R, D6R Series II, D7R, D7R Series II and D8R Series II Track-Type Tractors Power Train Electronic Control System Caterpillar

The CAT Data Link is an input and an output of the power train ECM. The data link communicates with other electronic control modules on the machine. The data link also communicates service tools. The data link is bidirectional. The power train ECM can input information and the power train ECM can output information. The data link is not a visible component. The data link consists of internal ECM circuits, the related harness wiring, and the service tool connector. The CAT data link connects to J1-3 and J1-9 of the ECM.

Much information is available on the CAT data link. The power train ECM, the engine ECM, and the Caterpillar Monitoring System require the use of certain data that is sent back and forth on the CAT data link. The information that is shared between the electronic control modules is listed below:

• The power train ECM receives commands from the Caterpillar Monitoring System in order to change the operating modes of the Power Train Electronic Control System. The power train ECM receives commands from the Caterpillar Monitoring System to read diagnostic codes and to clear diagnostic codes.

• The power train ECM receives information for the harness code from the Caterpillar Monitoring System. This information informs the power train ECM of the proper sales model.

• The power train ECM sends signals concerning the condition of the Power Train Electronic Control System to the Caterpillar Monitoring System. The Caterpillar Monitoring System alerts the operator of the condition by illuminating the corresponding alert indicator.

• The power train ECM sends the status of the parking brake, the direction of the transmission, and the gears to the Caterpillar Monitoring System. The Caterpillar Monitoring System displays the direction of the transmission and gear that is selected for the operator.

Note: All electronic control modules that use the CAT data link have a module identifier (MID). The module identifiers for the electronic control modules are listed below.

Power Train Electronic Control System ... 113

Caterpillar Monitoring System ... 30

Engine Electronic Control ... 36