C4.4 Marine Generator Set Caterpillar

Probable Causes

• Electrical connectors

• Data Link

• Electronic Control Module (ECM)

• CAN data link

Recommended Actions

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

2. Ensure that the following items are correctly installed and undamaged. Refer to Troubleshooting, "Electrical Connectors - Inspect".
   • P1 and P2 connectors on the ECM

   • Wiring to display modules

   • Wiring to other control modules

3. Troubleshoot the data link for possible faults. Refer to Troubleshooting, "Data Link - Test".

4. Verify that the CAN data link does not have an open or short circuit. Refer to Troubleshooting, "CAN Data Link - Test".