MANIFOLD 2N1993 - Caterpillar

Illustration 1 g03773176
Schematic of the CAT data link circuit This diagnostic code is recorded when the machine ECM has dropped off the CAT data link 10 times within a ten minute period. The event is active until communication is reliable for more than ten minutes. System Response:This failure results in events that are logged against an ECM that can not be explained. The "VIDS ECM" cannot communicate with this ECM or the ECM appears to work intermittently. Test Step 1. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS.
Verify that the following information is correct:
The part number of the "VIDS configuration software"
The part number of the "machine ECM flash software"
The part number of the "VIDS ECM"
The part number of the machine ECM Note: Consult the Business Unit that produces the product for the correct part numbers of the configuration software or refer to the Systems Operation, "VIDS Electronic Control Module" section of this manual for the part numbers of the VIDS software. Expected Result:All part numbers are correct. Results:
OK - All part numbers are correct. Proceed to test step 2.
NOT OK - All part numbers are NOT correct. Repair: The installed "VIDS ECM" or the machine ECM has the wrong part number or the incorrect configuration software is installed. Replace the incorrect "VIDS ECM" or the machine ECM with a module that has the correct part number. Flash the correct configuration software. See the Testing and Adjusting, "Electronic Control Module - Flash Program " section of this manual.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.
Check the wires at the connector.
Check each wire for nicks or signs of abrasion in the insulation.
Check for moisture at the connector.
Check the connectors for dirty contacts or corroded contacts.
Check each pin and each socket of the machine harness connectors. 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