RING 2M4451 - Caterpillar

Illustration 1 g00824855
Schematic for the Power Train ECMThis diagnostic code is recorded when the power train ECM does not recognize the attachment code that is being sent by the Caterpillar monitoring system ECM.Note: Ensure that the CID 0650 FMI 12 diagnostic code is active.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 power train ECM
The part number of the flash software for the Caterpillar monitoring system ECM
The part number of the Caterpillar monitoring system ECMNote: Consult the dealer for the correct part numbers of the flash software.Expected Result:All the part numbers are correct.Results:
YES - All the part numbers are correct. Proceed to Test Step 2.
NO - All the part numbers are NOT correct. Repair: Replace the incorrect ECM with a module that has the correct part number. Flash the correct software. See the Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program" section of this manual. Stop.Test 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:
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. Stop.Test Step 3. CHECK FOR SHORTS TO GROUND
The disconnect switch remains in the OFF position.
Disconnect the machine harness from all