BUSHING G- 6V7807 - Caterpillar

Illustration 1 g00875930
Schematic of CAT Data LinkThis diagnostic code is associated with the engine ECM.This diagnostic code is recorded when the engine ECM has dropped off the CAT data link 10 times within a ten minute period for more than five seconds. The event is active until communication is reliable for more than ten minutes.System Response:This diagnostic code results in events that are logged against an ECM that can not be explained directly. The brake/cooling ECM cannot communicate with the engine ECM or the ECM appears to communicate intermittently.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 engine ECM
The part number of the engine ECM
The part number of the flash software for the brake ECM
The part number of the brake ECMNote: Consult the Business Unit that produces the product for the correct part numbers of the flash software.Expected Result:All the part numbers are correct.Results:
OK - All the part numbers are correct. Proceed to Test Step 2.
NOT OK - All the part numbers are NOT correct. Repair: The ECM has the wrong part number or the incorrect software is installed. Replace the 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:
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 and/or the connector or replace the machine harness and/or the connector. Stop.Test Step 3. 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 brake ECM, measure the resistance between contacts J1-8 (wire 893-GN) and J1-7 (wire 892-BR) of the CAT data link and frame ground. 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