 | |
| Illustration 1 | g00951593 |
(1) CAT data link (2) CAN data link (3) Power Train ECM (4) Engine ECM (5) Instrument panel (6) Service Connector | |
The machine has two data links: the CAT data link and the CAN data link. A data link is not a visible component. A data link consists of internal ECM circuits and the connecting harness wiring. Data links are bidirectional. Data links allow the ECM to receive information and data links allow the ECM to send information.
The CAT data link is an input and an output of the ECM. The CATdata link is connected to the ECM at connector J1-3 (-) and J1-9 (+). The power train ECM communicates with the engine ECM on the CAT data link.
Caterpillar Electronic Technician (ET) also communicates with other ECM modules through the CAT data link. The ET will list the other ECM modules and the available diagnostic information. The information on both data links is available to the ET via the service connector.