ELECTRONIC TECHNICIAN (ET) TROUBLESHOOTING - Continued
Electronic Service Tool (Cat ET) will not communicate with ECM.
If the Electronic Service Tool (Cat ET) will not communicate with the ECM the following possible problems are
listed in order of most probable first.
Configuration for the communications adapter
Electrical (Cat ET) connectors
Communication adapter and/or cables
Electrical power supply to the CDC connector
Caterpillar Electronic Technician (ET) and related hardware
Electrical power supply to the Electronic Control Module (ECM)
Cat Data Link
The Cat ET will not communicate with the ECM.
On EMCP, set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to NORMAL.
On EMCP set ENGINE CONTROL switch to COOL DOWN/STOP.
Check the configuration for the communications adapter.
a. Access Preferences under the Utilities menu on Cat ET.
b. Verify that the correct communications interface device is selected.
Verify that the correct port is selected for use by the communication adapter.
The most commonly used port is COM 1.
d. Under Advanced menu, verify the baud rate is set for 57600.
e. Check for any hardware that is utilizing the same port as the communications
adapter. If any devices are configured to use the same port, exit or close the
software programs for that device.
Check the electrical connectors.
a. Check for correct installation of the ENG-P1 and ENG-P2 ECM connectors
Inspect all associated electrical wiring and connectors. Refer to
intermittent problem is suspected.