RING CLAMP 4P4739 - Caterpillar

Illustration 1 g01220777
Schematic of the CAT Data Link circuitThis diagnostic code is associated with the information sent from the Engine ECM to the Power Train ECM. The information is sent via the CAT Data Link. The CAT Data Link is connected to two inputs of the Power Train ECM. The FMI 09 means that the Power Train ECM has not received expected information from the Engine ECM.The possible causes of this diagnostic code are:
The wires for the CAT Data Link to the Engine 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 0590 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 Engine ECM.
The part number of the software for the Power Train ECM.
The part number of the Engine ECM.
The part number of the Power Train ECM.Note: 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 Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Replace" and Troubleshooting, Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program".STOPTest Step 2. INSPECT THE HARNESS CONNECTIONS
Turn the disconnect switch and 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