TOOL-REMOVAL 3552848 - Caterpillar

Problem-Cat ET unable to detect any electronic control modules
Probable Cause
Confirm that Cat ET version 2004B or later is being used.
Confirm the Cat ET preferences are set up to use the "Embedded Communication Adapter".Note: On some older laptops and operating systems, the baud rate setting may be need to be set lower in the preferences settings for the "Embedded Communication Adapter".
Use the "Cat Communication Adapter II" in order to connect and in order to verify that the other devices are detected. Ensure that the PL1000T is detected.
Confirm that the PL1000T is properly programmed with the latest available application flash file.
Verify the harness attached to the PL1000T serial port number 3 is implemented properly.
Connect the PC to the "Embedded Communication Adapter". Attempt to connect the Cat ET.
If communications are unsuccessful, alternately try a "NULL Modem" adapter between the PC and the "Embedded Comm Adapter". Attempt to connect the Cat ET again.Problem-Cat ET unable to detect any electronic control modules other than the PL1000T
Probable Cause
Note: This troubleshooting procedure discusses troubleshooting relative to the Cat Datalink, but can be equally applied for J1939 data link troubleshooting.
Use the "Cat Communication Adapter II" in order to connect to the system. If all devices besides the PL1000T are detected, analyze and repair the Cat Datalink connections between the PL1000Ts harness and the remainder of the Cat Datalink connections in the system.
Confirm Cat Datalink Boost function is properly enabled or disabled based on the needs of the application. If harness lengths exceed 31 m (100 ft), enable the "CDL Boost" function. If harness lengths do not exceed 31 m (100 ft), disable the "CDL Boost" function.
Observe the "Protocol Communication Statistics" pages in the PL1000T status screens. The PL1000T should be successfully sending and receiving messages.