BOLT-STOP 9T3049 - Caterpillar

Which Generate This Code:This code is associated with a communication problem on the Cat Data Link. This diagnostic code is recorded when the ECM cannot send information, or the ECM does not receive expected information from the data link (wire 892-BR and wire 893-GN or wire 944-OR and wire 945-BR).Possible causes of this diagnostic code are listed:
There is an open circuit or a short circuit on the data link.
There is a failure of the hardware for data link.System Response:The machine response is listed:
The service tool can not detect the ECM.
Communication failures are indicated by another ECM.Test Step 1. CLEAR THE DIAGNOSTIC CODES.
Use the ET to clear the logged diagnostic codes.
Use a valid electronic key to start the machine.
Determine if CID 0248 FMI 12 is present.Expected Result:CID 0248 FMI 12 is present.Results:
YES - CID 0248 FMI 12 is present. The problem was not caused by the use of an invalid electronic key. Proceed to Test Step 2.
NO - CID 0248 FMI 12 is NOT present. The problem was caused by the use of an invalid key in the key start switch. Stop.Test Step 2. INSPECT THE HARNESS CONNECTORS.
Inspect the connections for the machine harness that are related to the data link.
Make sure that connectors are clean and tight.
If necessary, repair the machine harness or replace the machine harness.
Use the ET to clear the diagnostic codes.
Use a valid electronic key to start the machine.
Determine if CID 0248 FMI 12 is present.Expected Result:CID 0248 FMI 12 is present.Results:
YES - The diagnostic code is present. Proceed to Test Step 3.
NO - The diagnostic code no longer exists and a machine harness connector was faulty. The failure is not present now. An intermittent connection may exist in the data link circuits of the machine harness. Repair: Replace any connectors that do not have a tight fitting. Repair any wiring in the harness that appears to be damaged. Watch for a recurrence of this fault Stop.Test Step 3. CHECK FOR A SHORTED HARNESS.
Turn the battery disconnect switch to the OFF position.
Disconnect the connector for the machine wiring harness from the MSS ECM. Disconnect the Cat Data Link from all other electronic control modules.
At the connector for the MSS ECM, measure the resistance between contact 42 (wire 892-BR or wire 944-OR) and contact45 (wire 893-GN or wire 945-BR).Expected Result:The resistance is greater than 5000 Ohms.Results:
YES - The resistance is greater than 5000 Ohms (no continuity). Harness circuit resistance is correct. Proceed to Test Step 4.
NO - Resistance is less than 5000 Ohms (continuity). The machine harness has failed. There is a short in the machine harness.Repair: Repair the machine harness or replace the machine harness. Stop.Test Step 4. CHECK FOR AN OPEN HARNESS.
The disconnect switch remains OFF.
The MSS ECM will remain disconnected from the machine harness.
Check the continuity of the data link circuit in the machine harness.
Locate the connector for the machine harness at the MSS ECM. Place a jumper wire between contact 42 (wire 892-BR or wire 944-OR) and 45 (wire 893-GN or wire