WASHER-THRUST 1067691 - Caterpillar

Transmission, SPN 639 FMI 9Conditions Which Generate This Code:
Illustration 1 g01204559
Connections of the J1939 Data Link circuit
This diagnostic code is recorded when the ECM stops receiving information on the J1939 Data Link.Note: The resistance of the J1939 circuit should measure approximately 120 ohms between circuit components.Test Step 1. INSPECT THE HARNESS CONNECTIONS.
Turn the disconnect switch to the OFF position.
Inspect all harness connections that are related to the J1939 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 2.
NOT OK - The machine harness connectors are in need of repair.Repair: Repair the machine harness or replace the machine harness. STOPTest Step 2. CHECK FOR SHORTS TO GROUND
The disconnect switch remains in the OFF position.
Disconnect the machine harness connectors from all electronic control modules that use the CAN data link.
At the machine harness for the ECM, measure the resistance between frame ground and connector contacts J2-67 (wire F711-GN(Green)) and J2-68 (wire F712-GY(Grey)) of the 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 Test Step 3.
NOT OK - The resistance is less than 5000 ohms. The machine harness has failed. Repair: There is a short between frame ground and contacts J2-67 (wire F711-GN(Green)) and J2-68 (wire F712-GY(Grey)) of the data link circuit in the machine harness. Repair the machine harness or replace the machine harness. STOPTest Step 3. CHECK FOR SHORT TO THE +BATTERY CIRCUIT
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 ECM, perform the checks that are listed here:
Measure the resistance between all of the connector contacts that are used at the ECM, and connector contact J2-67 (wire F711-GN(Green)).
Measure the resistance between all of the connector contacts that are used at the ECM, and connector contact J2-68 (wire F712-GY(Grey)). Expected Result:Each of the resistance measurements is greater than 5000 ohms. Results:
OK - The harness circuit resistance is correct. Proceed to Test Step 4.
NOT OK - One of the resistance measurements is less than 5000 ohms. The machine harness has failed. Repair: There is a short between the circuit with