SEAL-LIP TYPE 8C5219 - Caterpillar

Conditions Which Generate This Code:
Illustration 1 g01251041
Schematic of the Primary and Secondary Keypad ShiftersThis diagnostic trouble code is recorded when the Transmission ECU does not receive expected information from the gear shifter for a period of more than five seconds.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 Transmission ECU
The part number of the flash software for the gear selector
The part number of the Transmission ECU
The part number of the gear selectorNote: Consult your Caterpillar Dealer for the correct part numbers of the flash software.Expected Result:All of the part numbers are correct. Results:
OK - All of the part numbers are correct. Proceed to Test Step 2.
NOT OK - All of the part numbers are not correct. Repair: The installed Transmission ECU or the gear selector have the wrong part number or the incorrect flash software is installed. Replace the incorrect Transmission ECU or the gear selector with a module that has the correct part number. Flash the correct software. See the Testing and Adjusting, "Electronic Control Unit - Flash Program" section for additional information.STOPTest Step 2. INSPECT THE HARNESS CONNECTIONS.
Turn the disconnect switch to the OFF position.
Inspect all harness connections that are related to the CAN 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 or replace the machine harness.STOPTest Step 3. 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 Transmission ECU, measure the resistance between frame ground and connector contacts J2-67 (wire K900-YL) and J2-68 (wire K990-GN) of the CAN 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 4.
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 K900-YL) and J2-68 (wire K990-GN) of the CAN Data