CHASSIS AR 2058601 - Caterpillar

Illustration 1 g01210462
Schematic of the Hydraulic Lock Solenoid
This diagnostic code is associated with the Hydraulic Lock 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 hydraulic lock relay 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 hydraulic system.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 has been corrected. Test Step 1. CHECK THE SOLENOID.
Ensure that the hydraulic lock lever is in the UP position.
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. Expected Result:The diagnostic code changed on the Monitoring System.Results:
OK - The diagnostic code changed on the Monitoring System. The circuit is correct.Repair: The solenoid has failed. Replace the solenoid.STOP.
NOT OK - The diagnostic code did not change on the Monitoring System. The diagnostic code remains active. Proceed to Test Step 2.Test Step 2. CHECK THE HYDRAULIC ACTIVATION CIRCUIT OF THE HARNESS.
Turn the key start switch to the OFF position.
Disconnect the machine harness connectors J1 and J2 from the machine ECM.
The solenoid remains disconnected from the machine harness.
Place a jumper between contacts 3 (wire A588-GN(Green)) and 5 (wire E564-PK(Pink)) of the hydraulic lock on solenoid.
Place the hydraulic lock lever in the locked position (the down position).
At the machine harness connector J2 for the machine ECM, measure the resistance between contact J2-27 (wire E997-BR(Brown)) and all sources of ground. Expected Result:The resistance measurements are greater than 5000 ohms.Results:
OK - The resistance measurements are greater than 5000 ohms. The resistance is correct. Proceed to Test Step 3.
NOT OK - The resistance is less than 5000 ohms. The solenoid energizer circuit is shorted to +battery. Repair: Repair the machine harness or replace the machine harness.STOP.Test Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Reconnect all machine harness connectors.
Remove the jumper that was placed in the previous test.
Turn the disconnect switch and the key start switch to the ON position.
Clear all active diagnostic codes from the Monitoring System by pressing the OK key that is located on the keypad.
Operate the machine.
Check the Monitoring System for an active diagnostic code. Expected Result:The diagnostic code for the solenoid is not present. The diagnostic information may also be viewed with the ET. Results:
OK - The diagnostic code for the solenoid is not present. The diagnostic code was probably caused by a poor electrical connection or an open at one of the harness connectors that was disconnected and re connected. Resume normal machine operation.STOP
NOT OK - The diagnostic code for the solenoid is still present. The diagnostic code has not been corrected. The machine ECM has failed. It is unlikely