CONNECTOR-SPECIAL 3550632 - Caterpillar

Illustration 1 g01453048
Connections of the Cat Data LinkThe Cat Data Link is a communication link that is used for the movement of data between electronic controls. The Cat Data Link allows communication between the power train electronic control module (ECM) and the Vital Information Management System (VIMS). The Cat Data Link is bidirectional. The Cat Data Link allows the power train ECM to input information. The Cat Data Link allows the power train ECM to output information. The Cat Data Link is not a visible component. The Cat Data Link consists of the following parts: internal circuits of the Power Train ECM, the related harness wiring and the service tool connector. The Cat Data Link and the Power Train ECM are connected at contact J1-10 and contact J1-20.The Power Train ECM and the VIMS main module use data that is sent back and forth on the Cat Data Link. The following information is some of the information that is shared:
The Power Train ECM receives service commands from the VIMS in order to change the operating modes of the Power Train ECM. The service commands can direct the Power Train ECM to read service codes that are stored in the memory of the Power Train ECM. The service commands can direct the Power Train ECM to clear service codes that are stored in the ECM memory.
The Power Train ECM receives the harness code input from the VIMS. The Power Train ECM determines the sales model of the machine from the harness code input.
The Power Train ECM sends signals to the VIMS. The VIMS uses the signals to report on the status of the Power Train ECM. The VIMS alerts the operator of the status by illuminating the corresponding alert indicator.
The Power Train ECM sends the information that follows to the VIMS: parking brake status, status of the transmission direction and status of the transmission speed. The VIMS displays the transmission direction that is selected and the transmission speed that is selected. The VIMS uses this information in order to show the operator if the parking brake is engaged or disengaged.Note: All electronic control modules that use the Cat Data Link have a module identifier (MID). The module identifiers in table 1 are valid for the machines that are the subject of this service manual module:
Table 1
"Module Identifier (MID) Description"    
Identifier    Description    
36     Engine Control    
49     VIMS Main Module    
81     Power Train Control    
82     Implement Control