HOSE AS 3904988 - Caterpillar

Illustration 1 g03326557
Schematic of the Cat Data Link
The CID 590 is associated with the Engine ECM. The FMI 09 diagnostic code means that the Power Train ECM does not receive expected information from the Engine ECM for more than 5 seconds.System Response:This failure results in codes that are logged against an ECM that cannot be explained directly. The Power Train ECM cannot communicate with this ECM or the ECM appears to communicate intermittently. Test Step 1. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS
Verify that the following information is correct:
The part number of the flash software for the Power Train ECM
The part number of the flash software for the Engine ECM
The part number of the Power Train ECM
The part number of the Engine ECMNote: Consult your Caterpillar Dealer for the correct part numbers of the flash software.Expected Result:All of the part numbers are correct. Results:
OK - All of the part numbers are correct. Proceed to Test Step 2.
NOT OK - All of the part numbers are not correct. Repair: Install the proper part number for the appropriate ECM. Flash the proper software. Cycle the key start switch in order to initialize the new software. Refer to Testing and Adjusting, "Electronic Control Module (ECM) - Replace". If the diagnostic code is still active, contact the Technical Communicator at your dealership for possible consultation with Caterpillar.STOPTest Step 2. INSPECT THE HARNESS CONNECTIONS
Turn the disconnect 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:
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 FOR SHORTS TO GROUND
The disconnect switch remains in the OFF position.
Disconnect the machine harness connectors from all electronic control modules that use the Cat Data Link.
At the machine harness for the Power Train ECM, measure the resistance between frame ground and connector contacts 10 (wire 893-GN(Green)) and 20 (wire 892-BR(Brown)) of the Cat Data Link circuit. Expected Result:The resistance is greater than 5000 ohms. Results:
OK - The resistance is greater than 5000 ohms. The harness circuit resistance is correct. Proceed to Test Step