538, 548 and 558 Forest Machine Solenoid Valve (Switch Controlled)

Solenoid Valve (Switch Controlled) - Test

538, 548 and 558 Forest Machine [M0066266]

538, 548 and 558 Forest Machine Solenoid Valve - Test

538, 548 and 558 Forest Machine Switch Circuits - Test

HYDRAULIC SYSTEM

VALVE GP-SOLENOID

538, 548 and 558 Forest Machine Solenoid Valve - Test

538, 548 and 558 Forest Machine Solenoid Valve (Switch Controlled) - Test

1.1. Machine ECM

2.1. Diagnostic Trouble Code Procedure

Machine ECM

The following is a list of Diagnostic Trouble Codes (DTCs) that are associated with the hydraulic lock solenoid of the machine.

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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.

Solenoids are used to shutoff, release, distribute, or mix fluids on the machine. Generally, multiple solenoids are located together on a manifold. Solenoids convert 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 harness is open.
The harness is shorted.
The switch has failed.
The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 6 diagnostic code are:

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.

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Illustration 1	g06026623
Connections of the Hydraulic Lock Solenoid

The preceding diagram is a simplified schematic of the hydraulic lock solenoid connections. The schematic is electrically correct. However, not all the possible harness connectors are shown. Refer to the latest revision of the Electrical Schematic to view the entire circuitry of the machine.

Diagnostic Trouble Code Procedure

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 harness 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 the diagnostic code is active before performing a troubleshooting procedure.

Identify the active FMI code associated with the components.
Determine which code is present and use the list below to determine which procedure to follow.

FMI 3 diagnostic code, proceed to Table 2.
FMI 6 diagnostic code, proceed to Table 3.

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Table 2
FMI 3 Troubleshooting
Troubleshooting Test Steps	Values	Results
1. Check The Switch A. Turn the key start switch and the disconnect switch to the OFF position. B. Disconnect the switch from the machine harness. Place the switch in the UNLOCKED position. C. At the back of the switch, measure the resistance between contacts "B" and "C"	The resistance measurement is less than 5 Ω.	OK - The resistance measurement is less than 5 Ω. The switch is operating properly. Proceed to Test Step 2. NOT OK - The resistance measurement is greater than 5K Ω. The switch has failed. Repair: Repeat this Test Step to verify that the switch has failed. Toggle the switch state while observing the resistance measurement. If the resistance measurement is greater than 5K Ω, the switch has failed. Replace the switch. Proceed to Test Step 4.
2. Check The Signal Circuit For An Open A. The key start switch and the disconnect switch remain in the OFF position. B. Disconnect the machine harness connectors from the ECM and remove the relay. C. Reconnect the switch to the machine harness. Place the switch in the UNLOCKED position. D. At the ECM harness connector, insert a multimeter probe at the switch signal wire contact. E. At the harness connector for the relay, insert a multimeter probe at the positive relay coil contact. F. Measure the resistance between the signal contact and relay coil contact.	The resistance measurement is less than 5 Ω.	OK - The resistance measurement is less than 5 Ω. The wiring harness is correct. Proceed to Test Step 3. NOT OK - The resistance measurement is greater than 5K Ω. There is an open in the harness. Repair: Repair or replace the machine harness. Proceed to Test Step 4.
3. Check The Signal Circuit For A Short A. The key start switch and the disconnect switch remain in the OFF position. B. The ECM harness connectors and relay remain disconnected. C. At the ECM harness connector, measure the resistance between the switch signal circuit and all the other contacts that are used in the ECM.	Each resistance measurement is greater than 5K Ω.	OK - Each resistance measurement is greater than 5K Ω. Proceed to Test Step 4. NOT OK- A resistance measurement is less than 5 Ω. Repair: A short exists in the harness between the signal circuit and the circuit with the low-resistance measurement. Repair or replace the machine harness. Note: A resistance that is greater than 5 Ω but less than 5K Ω would indicate a loose connection or a corroded connection in the circuit. A resistance measurement that is greater than 5K Ω would indicate an open in the circuit. Proceed to Test Step 4.
4. Check If The Diagnostic Code Remains A. Reconnect all harness connectors. Return machine to normal operating condition. B. Turn the key start switch and the disconnect switch ON. C. Clear all diagnostic codes. D. Operate the machine. E. Stop the machine and engage the safety lock lever. F. Check if the diagnostic code is active.	The diagnostic code is no longer present.	OK - The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. NOT OK - The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP.

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Table 3
FMI 6 Troubleshooting
Troubleshooting Test Steps	Values	Results
1. Check the Relay A. Turn the key start switch and the disconnect switch to the OFF position. B. Remove the relay from the harness. C. Turn the disconnect switch and the key start switch to the ON position. D. Observe the status of the diagnostic code.	The diagnostic code is no longer active when the relay is disconnected.	OK - The diagnostic code is no longer active when the relay is disconnected. The circuit is correct. The relay has failed. Repair: Repeat this Test Step to verify the relay failure. Replace the relay. Proceed to Test Step 3. NOT OK - The diagnostic code remains active. Proceed to Test Step 2.
2. Check The Energize Circuit Of The Relay For A Short To Ground A. Turn the key start switch and the disconnect switch OFF. B. The relay remains disconnected from the machine harness. C. Disconnect the harness connectors from the ECM. D. Place the switch in the UNLOCKED position. E. At the ECM harness connectors, measure the resistance between the relay signal contact and frame ground.	The resistance measurement is greater than 5K Ω.	OK - The resistance measurement is greater than 5K Ω. Proceed to Test Step 3. NOT OK - The resistance measurement is not greater than 5K Ω. There is a short in the machine harness. Repair: Repair or replace the machine harness. Proceed to Test Step 3.
3. Check If The Diagnostic Code Remains A. Reconnect all harness connectors. Return machine to normal operating condition. B. Turn the key start switch and the disconnect switch ON. C. Clear all diagnostic codes. D. Operate the machine. E. Stop the machine and engage the safety lock lever. F. Check if the diagnostic code is active.	The diagnostic code is no longer present.	OK - The diagnostic code does not exist currently. The initial diagnostic code may have been caused by poor electrical connection or short at one of the harness connections. Resume machine operation. STOP. NOT OK - The diagnostic trouble code has not been corrected. If the diagnostic code has not been corrected after performing the procedure a second time, the ECM may require replacement. Prior to replacing the ECM, always contact the Technical Communicator at your dealership for possible consultation with AVSpare. This consultation may effect repair time. Follow the steps in Troubleshooting, "ECM - Replace" if the ECM needs to be replaced. STOP.