SOLENOID SUB. ASSY. A 5I9506 - Caterpillar

Illustration 1 g01924068
Schematic of the Hydraulic Lock SolenoidThis diagnostic code is associated with the "Hydraulic Lock" solenoid. The FMI 06 diagnostic code means that the Machine ECM has determined that the current is above normal.The possible causes of this diagnostic code are listed below:
The solenoid energizer circuit is shorted to ground.
The hydraulic lock relay has failed.
The Machine ECM has failed. A failure of the Machine ECM is unlikely.Note: The Machine ECM is equipped with LED indicators that serve as a self-diagnostic check. With the key start switch ON, the following can be determined by the ECM indicator lights:
If all of the LED lights are Off, voltage is not being supplied to the Machine ECM. Check for power to the ECM.
If the yellow LED is Flashing, a communication error exists on the "CAN" data-link circuit.
If the yellow LED is constantly On, the Machine ECM software may be missing / not loaded.
If the red LED is Flashing, the Machine ECM has failed and may need replacement. 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 FUNCTION OF THE "HYDRAULIC LOCK" DIODE
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect wire E997-RD at pin 1 and wire 150-RD at pin 2 from "HYDRAULIC LOCK PRV DIODE 1".
At connector pin 1 and connector pin 2 of "HYDRAULIC LOCK PRV DIODE 1", check the operation of the diode. In order to check the diode, use a multimeter that has a function for checking diodes.
Reverse the position of the probes of the multimeter and check the diode again.Expected Result:The readout of the meter should indicate a voltage of 0.5 VDC to 0.8 VDC in one position. The readout should read "OUCH (open circuit)" when the position of the probes is in the opposite position.Results:
OK - The diode is working properly. Proceed to Test Step 2.
NOT OK - The diode has failed the test that is described above.Repair: Follow the schematic in order to install the new diode. Follow the process that is described above in order to check the continuity of the diode prior to installation.STOPTest Step 2. 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 3.Test Step 3. CHECK THE HYDRAULIC ACTIVATION CIRCUIT OF THE