SEAL-RING 1U4020 - Caterpillar

Illustration 1 g02693961This diagnostic code is associated with the information from the Implement ECM to the Advisor. The information is sent via the Cat Data Link. The Cat Data Link is connected to two inputs of the Advisor. The FMI 09 means that the Advisor has not received expected information from the Implement ECM.The possible causes of this diagnostic code are listed:
The wires for the Cat Data Link to the Implement ECM are open or the wires are shorted.
The wrong software is installed on an ECM.Note: The following test procedure may create other diagnostic codes. Ignore these diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 0596 FMI 09 is active before performing this procedure.Test Step 1. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS
Verify that the following information is correct:
The part number of the software for the Implement ECM
The part number of the software for the Advisor
The part number of the Implement ECM
The part number of the AdvisorNote: Consult your Caterpillar dealer for the correct part numbers of the software.Expected Result:All of the part numbers are correct.Results:
YES - All of the part numbers are correct. Proceed to Test Step 2.
NO - One or more of the part numbers are not correct. Repair: Replace the incorrect ECM with an ECM that has the correct part number. Install the correct software. Refer to Testing and Adjusting, "Module - Replace" and Testing and Adjusting, "Module - Flash Program".STOPTest Step 2. INSPECT THE HARNESS CONNECTIONS
Turn the disconnect switch and the key start switch to the OFF position.
Inspect all harness connections that are related to the Cat Data Link. Make sure that the connectors are clean and tight.
Check the connectors for proper mating. Ensure that all the seals are present and in place.
Check the harness for signs of damage or abrasion.
Check the wires at the connector. Ensure that the wires are secured tightly into the connector. Take care not to pull the wire out of the connector.
Check the exposed wires at the connectors for nicks or signs of abrasion.
Check for moisture inside the connector.
Check the connectors for dirty contacts or corroded contacts.
Check each pin and each socket of the machine harness connectors. Ensure that the contacts are properly installed. The contacts should mate correctly when the two pieces of the connector are placed together. Expected Result:The machine harness connectors are tight and free of corrosion.Results:
YES - The machine harness connectors are tight and free of corrosion. Proceed to Test Step 3.
NO - The machine harness connectors are in need of repair.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK FOR A SHORT CIRCUIT IN THE HARNESS
Ensure that the disconnect switch and the key start switch remain in the OFF position.
Disconnect the machine harness connectors from all electronic control modules that use the Cat Data Link.
At the machine harness connector for the Messenger, measure the resistance between connector contact 4 (wire 893-GN(Green)) and all of the