HUB AS 5Q9185 - Caterpillar

solenoid connector for damage.
Fabricate a jumper wire in order to short the two wires for the suspect solenoid on the solenoid connector. Crimp a pin to each end of the jumper wire.
Make sure that the solenoid connector securely holds the jumper wire. Note: Worn terminals and/or damaged terminals on the solenoid connector could cause an intermittent "Open".
Turn the key switch to the ON position.
Access the "Special Tests" under the "Diagnostics" menu.
Start the "Retarder Brake Test" on Cat ET.
Once Cat ET displays the status of the engine retarder solenoid, stop the "Retarder Brake Test".
Check for active diagnostic codes and/or logged diagnostic codes that are associated with the retarder solenoids. Expected Result:A high current diagnostic code (06) is logged at this time.Results:
OK - A high current diagnostic code (06) is logged at this time. The harness wiring between the solenoid connector for the suspect engine retarder solenoid and ECM connector P2 is OK.Repair: Temporarily connect a new engine retarder solenoid.Temporarily connect a new engine retarder solenoid to the harness, but do not install the new engine retarder solenoid in the engine. Verify that there are no active diagnostic codes for the engine retarder solenoid. If there are no active diagnostic codes for the engine retarder solenoid, permanently install the new engine retarder solenoid. Clear any logged diagnostic codes.STOP
Not OK - A low current diagnostic code (05) is active at this time. The ECM did not recognize the short circuit.Repair: Repair the