BOLT 4846893 - Caterpillar

Communications must stop a minimum of ten times, for more than 5 seconds within a 10-minute period. The event remains active until communication is again reliable for more than 10 minutes. Possible causes of this diagnostic code are:
Incorrect software, or hardware, Part Numbers.
Poor machine harness electrical connections.r
A Cat Datalink circuit shorted to ground.
A Cat Datalink circuit shorted to +Battery.
Open Cat Datalink circuit.Note: Poor connections are often the cause of a problem in electrical circuits. Before performing this procedure, inspect all the machine harnesses and connectors involved in the circuit. Make sure to verify that all of the connections in the circuit are clean, secure, and in good condition. Correct any problems found with any of the connections. Verify the diagnostic code CID 1421 FMI 14 is still active, before continuing with this procedure.Note: This test procedure may create other diagnostic codes. Ignore all those created diagnostic codes now, but clear those codes after the cause for the original diagnostic code has been corrected. System Response:This failure results in events logged against the Scraper Transmission ECM that cannot be explained. The Scraper Engine ECM cannot communicate with the Scraper Transmission ECM, or the communications between the two ECMs appear to be intermittent. Test Step 1. VERIFY THE HARDWARE AND THE SOFTWARE PART NUMBERS.
Verify the following Part Numbers:
Scraper Transmission ECM Software.
Scraper Engine ECM Software.
Scraper Transmission ECM.
Scraper Engine ECM.Note: For the correct machine configuration, consult the Business Unit that produces the product. Expected Result:All Part Numbers are correct.Results:
YES - All part numbers are correct. Go to Test Step 4.
NO - All of the part number are not correct.Repair: One of the modules may have the wrong part number and/or the software configuration is not correct. See Testing and Adjusting, "Electronic Control Module (ECM) - Flash Program". Go to Test Step 8Test Step 2. CHECK FOR ADDITIONAL RELATED DIAGNOSTIC CODES.
Ensure that all electronic control modules that use the Cat Datalink are connected.
Turn the disconnect switch and the key start switch to the ON position.
Acknowledge any active diagnostic codes that are currently displayed on the message center.
Verify that no other related, and active, diagnostic codes are present. Expected Result:No other related, and active, diagnostic codes are present. Results:
YES - No other related active diagnostic codes are present, but CID 1421 FMI 14 is still active. Go to Test Step 4.
NO - Other related active diagnostic codes are present, and CID 1421 FMI 14 is still active. Go to Test Step 3.Test Step 3. CLEAR ALL ACTIVE RELATED DIAGNOSTIC CODES.
Perform all required Test Procedures to clear all other related, active diagnostic codes.Expected Result:All related active diagnostic codes are cleared, and CID 1421 FMI 14 is no longer active.Results:
YES - All other related active diagnostic codes are cleared, and CID 1421 FMI 14 is no longer active.Repair: The diagnostic codes do not exist at this time. Return the machine to normal operations.STOP
NO - All other related active diagnostic codes are cleared, but CID 1421 FMI 14 is still active. Go to Test Step