- Electrical power supply
- Electrical connectors
- Communication adapter and/or cables
- Electronic service tool
Check power to the ECM or the ITSM. Refer to Troubleshooting, "Electrical Power Supply".
Note: If the modules are not receiving battery voltage, the modules will not communicate.
Check the following components:
- Battery connections and ground to the ECM or the ITSM
- Wiring harnesses and the connectors for the ECM or the ITSM
- Wiring harnesses and the connectors for the ECM or the ITSM in the terminal box
Refer to Troubleshooting, "Inspecting Electrical Connectors".
Communication Adapter and/or Cables
- Check the condition of the fuse for the communication adapter.
- Disconnect the communication adapter and the cables from the service tool connector. Then reconnect the communication adapter.
If you are using the 7X-1700 Communication Adapter Gp, refer to Special Instruction, SEHS9264, "Using the 7X1700 Communication Adapter Group".
If you are using the 171-4401 Communication Adapter II, refer to Manual, NEHS0758, "Communication Adapter II User's Manual".
- Verify that battery voltage is present between terminal A and terminal B of the service tool connector. If the communication adapter is not receiving power, the display will be blank.
In order to eliminate Cat ET as the problem, connect Cat ET to a different engine. If the same problem occurs with a different engine, check Cat ET and the related equipment in order to determine the cause of the problem.