PLUG 1961195 - Caterpillar

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. This failure results in events that are logged against an ECM that can not be explained. The VIMS main module cannot communicate with this ECM or the ECM appears to work intermittently.
VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS.
Verify that the following information is correct:
The part number of the VIMS configuration software
The part number of the machine ECM flash software.
The part number of the VIMS main module
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. Expected Result: All part numbers are correct. Results:
OK - All part numbers are correct. Proceed to 2.
NOT OK - All part numbers are NOT correct. The installed VIMS main module or the machine ECM has the wrong part number or the incorrect configuration software is installed. Replace the incorrect VIMS main module or the machine ECM with a module that has the correct part number. Flash the correct configuration software. STOP.
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 3.
NOT OK - The machine harness connectors are in need of repair. Repair the machine harness or replace the machine harness. STOP.
CHECK FOR SHORTS TO GROUND
The disconnect switch remains in the OFF position.
Disconnect the machine harness from all electronic control modules that use the CATdata link.
At the machine harness for the VIMS main module, measure the resistance between frame ground and connector contacts 6 (wire 882-PK) and 7 (wire 893-GY) 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 4.
NOT OK - The resistance is less than 5000 ohms. The machine harness has failed. There is a short between frame ground and the CAT data link circuit in the machine harness. Repair the machine harness or replace the machine harness. STOP.
CHECK FOR SHORT TO +BATTERY
The disconnect switch remains in the OFF position.
All related electronic control modules remain disconnected from the machine harness.
At the machine harness connector for the VIMS main module, perform the checks that are listed here:
Measure the resistance between (+battery) connector contact 1 (wire 113-OR) and contact 6 (wire 882-PK) of the CAT data link circuit