3126B Marine Engines Caterpillar


ECM Will Not Communicate with Other Systems or Display Modules

Usage:

3126B 3GS
Note: If the vessel is equipped with a Multi-Station Control System (MSCS), refer to Service Manual, RENR7651, "Marine Multi-Station Control System" for the proper troubleshooting procedure.

Probable Causes

  • Wiring and/or electrical connectors

  • Cat Data Link

  • CAN data link (if equipped)

  • Electronic Control Module (ECM)

Recommended Actions

  1. Connect the electronic service tool to the service tool connector. If the ECM does not communicate with the electronic service tool, refer to Troubleshooting, "Electronic Service Tool Will Not Communicate with ECM".

  1. Troubleshoot the Cat Data Link for possible problems. Refer to Troubleshooting, "Cat Data Link Circuit - Test".

  1. Troubleshoot the CAN data link (if equipped) for possible problems. Refer to Troubleshooting, "CAN Data Link Circuit - Test".

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