PISTON 6E5683 - Caterpillar

Machine ECM
The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the hydraulic lock solenoid of the machine.
Table 1
Machine ECM (MID 299)
DTC Code Description System Response
1160-3 Hydraulic Lock Solenoid: Voltage Above Normal Hydraulic lock solenoid will not function.
1160-6 Hydraulic Lock Solenoid: Current Above Normal Hydraulic lock solenoid will not function. The solenoid is used to shutoff, release, distribute, or mix fluids on the machine. Generally, multiple solenoids are located together on a manifold. The solenoid converts electrical energy into magnetic energy, moving a spool located inside the housing of the valve. A spring is used to hold the spool in position until the solenoid is energized.The magnetic force that acts on the valve spool is created when a coil inside the solenoid is energized. Possible Causes for an FMI 3 Diagnostic code are:
The solenoid has failed.
The harness is shorted.
The ECM has failed. A failure of the ECM is unlikely.Possible causes for an FMI 6 Diagnostic code are:
The solenoid has failed.
The relay has failed.
The energize circuit of the relay is shorted to ground.
The ECM has failed. A failure of the ECM is unlikely.
Illustration 1 g03329907
Connections of the Hydraulic Lock Solenoid
Note: The diagram above is a simplified schematic of the hydraulic lock solenoid connections. The schematic is electrically correct. However, not all of the possible harness connectors are shown. Refer to the latest revision of Electrical Schematic, UENR2487 (374F) or Electrical Schematic, UENR2489 (390F) for the complete schematic.Note: The following test procedure may create other diagnostic trouble codes. Ignore these created diagnostic trouble codes and clear the diagnostic trouble codes when the original diagnostic trouble code has been corrected.Diagnostic Trouble Code Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in this circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure, and in good condition. Check the wiring for pinch points or abrasions. Look for and repair areas that indicate wires are exposed. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing a troubleshooting procedure.
Table 2
Troubleshooting Test Steps Values Results
1. Identify Active FMI Code Associated With Solenoid Circuit
Code present. FMI 3 diagnostic code, proceed to Test Step 2.
FMI 6 diagnostic code, proceed to Test Step 5.
Begin Process For FMI 3 Troubleshooting HERE
2. Check The Energize Circuit Of The Solenoid For A Short To +Battery Circuit
A. Turn the key start switch and the disconnect switch to the OFF position.
B. Disconnect the machine harness connectors from the solenoid and the ECM.
C. At the ECM harness connector, measure the resistance between the solenoid contact (A588-GN(Green)) and all contacts used in the ECM connectors.
Each resistance measurement is greater than 5K Ω. OK - Each resistance measurement is greater than 5K Ω.
Repair: The solenoid has failed. Replace the solenoid.
Proceed to Test Step 5.
NOT OK - Each resistance measurement is not greater than 5K Ω. There is a short in the