3406E and 3456 Generator Set Engines Caterpillar

Probable Causes

• Electrical power supply

• Electronic Control Module (ECM)

• Personality module (flash file)

• Electrical connectors

• CAT Data Link

Recommended Actions

1. Check power to the ECM. Refer to Troubleshooting, "Electrical Power Supply Circuit - Test".

   Note: If the ECM is not receiving battery voltage, the ECM will not communicate.

1. Connect the Caterpillar Electronic Technician (ET) to the service tool connector. If the ECM does not communicate with Cat ET, refer to Troubleshooting, "Electronic Service Tool Will Not Communicate with ECM".

2. Ensure that the correct personality module is properly installed in the ECM.

   Note: The personality module that is provided in a new ECM is blank. The engine will not start and the engine will not communicate with Cat ET until the personality module has been flashed. Refer to Troubleshooting, "Flash Programming".

3. Ensure that the following items are correctly installed and undamaged. Refer to Troubleshooting, "Electrical Connectors - Inspect".

   • ECM connector J1/P1

   • Machine interface connector J3/P3

   • Wiring to display modules

   • Wiring to other control modules

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