YOKE ASSEM. 8D3778 - Caterpillar

Illustration 1 g03327352
Schematic of the Cat Data Link
The CID 0596 is associated with communication of the Implement ECM via the Cat Data Link. The Cat Data Link is an input and output for all electronic control modules. The data link is designed to carry communications between all electronic control modules and service tools. The data link is not a visible component. The data link consists of internal control circuits and the connecting harness wiring.The FMI 09 diagnostic code is caused by an abnormal data link communication between the Advisor module and the Implement ECM. The update rate is not correct. Check for a diagnostic code that is related to the data link. Correct the related diagnostic codes.The possible causes of this diagnostic code are listed below:
The data link circuit has an open circuit.
The data link circuit is shorted to battery ground.
The Implement ECM is not operating properly.
The software for the Implement ECM has been erased.
The Implement ECM has the wrong software.
The ECM has generated this code in error.
The fuse for the Implement ECM may have failed.Test Step 1. CHECK THE SOFTWARE PART NUMBERS.
Verify that the part numbers for the Advisor module software and the part numbers for the Implement software are correct. Note: Consult the Business Unit that is producing the product for the correct software part numbers.Expected Result:The software part numbers are correct.Results:
OK - The software part numbers are correct. Proceed to test step 2.
NOT OK - The software part number is not correct.Repair: The installed Implement ECM or the Advisor module have the wrong part number or the incorrect flash software is installed. Replace the incorrect Implement ECM or the Advisor module with a module that has the correct part number. Flash the correct software. Refer to the Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program" section for additional information.STOPTest Step 2. INSPECT THE HARNESS CONNECTIONS
Turn the key start switch and the disconnect switch to the OFF position.
Inspect all harness connections that are related to the Cat Data Link. Ensure 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:
OK - The machine harness connectors are tight and free of corrosion. Proceed to Test Step 3.
NOT OK - The machine harness connectors are in need of repair.Repair: Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK THE