IT28G and IT38G Integrated Toolcarriers and 924G, 924GZ, 928G and 938G Wheel Loaders Power Train Electronic Control System Caterpillar

The CAT Data Link is an input/output of the transmission ECM. The data link communicates with other electronic control modules (ECM) on the machine or the data link communicates with a service tool. The data link is bidirectional. This allows the ECM to input information and this allows the ECM to output information. The data link is not a visible component. The data link consists of the following parts: internal ECM circuits, the related harness wiring and the service tool connector. The CAT data link connects to the ECM at contact 8 (wire 944-OR) and contact 9 (wire 945-BR).

Much information is available on the CAT data link. The transmission ECM requires the use of certain data that is sent back and forth on the CAT data link. Some of the shared information follows:

• The transmission ECM receives commands in order to change the modes of operation. The transmission ECM receives commands in order to read diagnostic codes that are stored in the memory of the transmission ECM. The transmission ECM receives commands in order to clear service codes that are stored in the memory of the transmission ECM.

Note: Every electronic control module that uses CAT data link has a module identifier. The MID for the Transmission Electronic Control is 081.