Electronic Service Tool Will Not Communicate with ECM
The probable root causes are listed below:
- Connector or wiring problem
- Communication adapter and/or cable
- Battery voltage
- Service tool connector
- Personality Module
- CAT Data Link
- Electrical power supply to the Electronic Control Module (ECM)
Perform the following checks:
- Check for correct installation of the ECM connectors J1/P1, J2/P2 and service tool connector J60/P60. Refer to the diagnostic functional test Troubleshooting, "Inspecting Electrical Connectors".
- Disconnect the communication adapter from the ECM. Reconnect the communication adapter to the ECM.
- Verify that the correct cable from the communication adapter to the ECM is being used. Refer to the diagnostic procedure Troubleshooting, "Electronic Service Tools".
- Verify that battery voltage is present at pin-A and pin-B of the service tool connector. If the communication adapter tool is not receiving power the display will be blank.
- Check for correct installation of the ECM Personality Module.
Note: If the Personality Module has not been installed or the Personality Module is a blank, new Personality Module, the engine will not start. If the Personality Module has not been installed or the Personality Module is a blank, new Personality Module, the engine will not communicate with the service tools. Refer to the diagnostic procedure Troubleshooting, "Programming Parameters".
- Check power to the ECM. Refer to the diagnostic functional test Troubleshooting, "Electrical Power Supply".
Note: If the ECM is not receiving 24 VDC the ECM will not communicate.
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