HUB AS 4160630 - Caterpillar

Illustration 1 g01136474
Schematic of the Left Travel Reverse Solenoid This diagnostic code is associated with the Left Travel Reverse Solenoid. The FMI 06 means that the machine ECM determined that the current is above normal.The possible causes of this diagnostic code are listed:
The solenoid energizer circuit is shorted to ground.
The solenoid has failed.
The machine ECM has failed. This is unlikely. When this diagnostic code occurs, a warning is displayed on the Monitoring System and the machine ECM disables the circuit. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code is corrected. Test Step 1. CHECK THE SOLENOID.
Turn the disconnect switch and the key start switch to the ON position. Do NOT start the engine.
Ensure that the diagnostic code is active on the Monitoring System.
Disconnect the suspect solenoid from the machine harness.
Observe the Monitoring System. The diagnostic information may also be viewed with the ET. Expected Result:The diagnostic code is no longer active on the Monitoring System. The Monitoring System may take several seconds before the diagnostic information is updated. This is normal.Results:
OK - The diagnostic code is no longer active on the Monitoring System. The circuit is correct.Repair: The solenoid has failed. Replace the solenoid. Stop.
NOT OK - The diagnostic code remains active. Proceed to test step 2.Test Step 2. CHECK THE SOLENOID ENERGIZER CIRCUIT FOR A SHORT TO GROUND.
Turn the key start switch and the disconnect switch to the OFF position.
The solenoid remains disconnected from the machine harness.
Disconnect the machine harness connectors J1 and J2 from the machine ECM.
At the machine harness connector J2 for the machine ECM, measure the resistance from the signal contact J2-63 (wire K943-OR) to all possible sources of ground. Expected Result:The resistance measurements should be greater than 5000 ohms.Results:
OK - The resistance measurements were greater than 5000 ohms. The harness is correct. Proceed to test step 3.
NOT OK - The resistance is less than 5000 ohms. The harness is incorrect. The short is between the signal circuit (wire K943-OR) and the circuit with the lowest resistance measurement.Repair: Repair the machine harness or replace the machine harness. Stop.Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the harness connectors and clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Clear all the active events that are shown on the Monitoring System by pressing the OK key.
Operate the machine.
Observe the Monitoring System. Expected Result:The diagnostic code is not active on the Monitoring System. Results:
OK - The diagnostic code is not active on the Monitoring System. The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connections that was disconnected and reconnected. Resume normal machine operation. Stop.
NOT OK - The diagnostic code is active on the Monitoring System. The diagnostic code has not been corrected. The machine ECM has