374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Solenoid Valve - Test Caterpillar


Solenoid Valve - Test
`
1.1. Machine ECM
2.1. Implement ECM 1
3.1. Implement ECM 2
4.1. Diagnostic Trouble Code Procedure

Machine ECM

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

Table 1
Machine ECM (MID 299) 
DTC  Code Description  System Response 
374-3  Swing Brake Solenoid: Voltage Above Normal  Machine swing function will be inoperable. 
374-5  Swing Brake Solenoid: Current Below Normal  Machine swing function will be inoperable. 
374-6  Swing Brake Solenoid: Current Above Normal  Machine swing function will be inoperable. 
438-3  Hydraulic Control Valve Warm Up Solenoid 1: Voltage Above Normal  Warm up function will be disabled. 
438-5  Hydraulic Control Valve Warm Up Solenoid 1: Current Below Normal  Warm up function will be disabled. 
438-6  Hydraulic Control Valve Warm Up Solenoid 1: Current Above Normal  Warm up function will be disabled. 
439-3  Hydraulic Control Valve Warm Up Solenoid 2: Voltage Above Normal  Warm up function will be disabled. 
439-5  Hydraulic Control Valve Warm Up Solenoid 2: Current Below Normal  Warm up function will be disabled. 
439-6  Hydraulic Control Valve Warm Up Solenoid 2: Current Above Normal  Warm up function will be disabled. 
463-3  Implement Dual Pressure Relief Solenoid: Voltage Above Normal  Maximum digging force will decrease. 
463-5  Implement Dual Pressure Relief Solenoid: Current Below Normal  Maximum digging force will decrease. 
463-6  Implement Dual Pressure Relief Solenoid: Current Above Normal  Maximum digging force will decrease. 
581-3  Power Shift Solenoid: Voltage Above Normal  An increase in the PWM signal will produce a higher power shift pressure that is proportional to the load on the engine. 
581-5  Power Shift Solenoid: Current Below Normal  A decrease in the PWM signal will produce a lower power shift pressure that is proportional to the load on the engine. 
581-6  Power Shift Solenoid: Current Above Normal  An increase in the PWM signal will produce a higher power shift pressure that is proportional to the load on the engine. 
598-3  Travel Speed Solenoid: Voltage Above Normal  Machine travel speed selection is limited. 
598-5  Travel Speed Solenoid: Current Below Normal  Machine travel speed selection is limited. 
598-6  Travel Speed Solenoid: Current Above Normal  Machine travel speed selection is limited. 
1119-3  Boom Anti Drift Solenoid: Voltage Above Normal  Anti drift function will be inoperable. 
1119-5  Boom Anti Drift Solenoid: Current Below Normal  Anti drift function will be inoperable. 
1119-6  Boom Anti Drift Solenoid: Current Above Normal  Anti drift function will be inoperable. 
1120-3  Stick Anti Drift Solenoid: Voltage Above Normal  Anti drift function will be inoperable. 
1120-5  Stick Anti Drift Solenoid: Current Below Normal  Anti drift function will be inoperable. 
1120-6  Stick Anti Drift Solenoid: Current Above Normal  Anti drift function will be inoperable. 
1143-3  Swing Right Solenoid: Voltage Above Normal  Swing functions will be limited. 
1143-5  Swing Right Solenoid: Current Below Normal  Swing functions will be limited. 
1143-6  Swing Right Solenoid: Current Above Normal  Swing functions will be limited. 
1143-13  Swing Right Solenoid: Out of Calibration  Swing functions will be limited. 
1144-3  Swing Left Solenoid: Voltage Above Normal  Swing functions will be limited. 
1144-5  Swing Left Solenoid: Current Below Normal  Swing functions will be limited. 
1144-6  Swing Left Solenoid: Current Above Normal  Swing functions will be limited. 
1144-13  Swing Left Solenoid: Out of Calibration  Swing functions will be limited. 
1149-3  Boom Lowering Check Valve Solenoid: Voltage Above Normal  Check valve will be inoperable. 
1149-5  Boom Lowering Check Valve Solenoid: Current Below Normal  Check valve will be inoperable. 
1149-6  Boom Lowering Check Valve Solenoid: Current Above Normal  Check valve will be inoperable. 
1159-3  Stick Lowering Check Valve Solenoid: Voltage Above Normal  Check valve will be inoperable. 
1159-5  Stick Lowering Check Valve Solenoid: Current Below Normal  Check valve will be inoperable. 
1159-6  Stick Lowering Check Valve Solenoid: Current Above Normal  Check valve will be inoperable. 
1525-3  Straight Travel Solenoid: Voltage Above Normal  Straight travel system will be inoperable. 
1525-5  Straight Travel Solenoid: Current Below Normal  Straight travel system will be inoperable. 
1525-6  Straight Travel Solenoid: Current Above Normal  Straight travel system will be inoperable. 
1525-13  Straight Travel Solenoid: Out of Calibration  Straight travel system will be inoperable. 
1530-3  Quick Coupler Solenoid: Voltage Above Normal  Quick coupler function will be inoperable. 
1530-5  Quick Coupler Solenoid: Current Below Normal  Quick coupler function will be inoperable. 
1530-6  Quick Coupler Solenoid: Current Above Normal  Quick coupler function will be inoperable. 
1567-3  Implement Pump to Tank Bypass Solenoid #1: Voltage Above Normal  Attachment / tool functions unavailable. 
1567-5  Implement Pump to Tank Bypass Solenoid #1: Current Below Normal  Attachment / tool functions unavailable. 
1567-6  Implement Pump to Tank Bypass Solenoid #1: Current Above Normal  Attachment / tool functions unavailable. 
1567-13  Implement Pump to Tank Bypass Solenoid #1: Out of Calibration  Attachment / tool functions unavailable. 
1568-3  Implement Pump to Tank Bypass Solenoid #2 Voltage Above Normal  Attachment / tool functions unavailable. 
1568-5  Implement Pump to Tank Bypass Solenoid #2 Current Below Normal  Attachment / tool functions unavailable. 
1568-6  Implement Pump to Tank Bypass Solenoid #2 Current Above Normal  Attachment / tool functions unavailable. 
1568-13  Implement Pump to Tank Bypass Solenoid #2 Out of Calibration  Attachment / tool functions unavailable. 
1665-3  Variable Relief Valve #1 Pressure Solenoid: Voltage Above Normal  Hydraulic pressure system disabled. 
1665-5  Variable Relief Valve #1 Pressure Solenoid: Current Below Normal  Hydraulic pressure system disabled. 
1665-6  Variable Relief Valve #1 Pressure Solenoid: Current Above Normal  Hydraulic pressure system disabled. 
1666-3  Variable Relief Valve #2 Pressure Solenoid: Voltage Above Normal  Hydraulic pressure system disabled. 
1666-5  Variable Relief Valve #2 Pressure Solenoid: Current Below Normal  Hydraulic pressure system disabled. 
1666-6  Variable Relief Valve #2 Pressure Solenoid: Current Above Normal  Hydraulic pressure system disabled. 
2272-3  Combining Valve Solenoid: Voltage Above Normal  Boom and bucket operations will be inoperable. 
2272-5  Combining Valve Solenoid: Current Below Normal  Boom and bucket operations will be inoperable. 
2272-6  Combining Valve Solenoid: Current Above Normal  Boom and bucket operations will be inoperable. 
2272-13  Combining Valve Solenoid: Out of Calibration  Boom and bucket operations will be inoperable. 
2855-3  Main Hydraulic Pump #1 Solenoid: Voltage Above Normal  An increase in current to the negative flow control PRV causes a decrease in NFC hydraulic pressure to the pump regulators. This decrease of NFC pressure to the pump regulators causes the main hydraulic pumps to upstroke, increasing the flow. 
2855-5  Main Hydraulic Pump #1 Solenoid: Current Below Normal  A decrease in current causes an increase in NFC hydraulic pressure which is then sent to the pump regulators. This increase in NFC pressure to the pump regulators causes the main hydraulic pumps to destroke, decreasing the flow. 
2855-6  Main Hydraulic Pump #1 Solenoid: Current Above Normal  An increase in current to the negative flow control PRV causes a decrease in NFC hydraulic pressure to the pump regulators. This decrease of NFC pressure to the pump regulators causes the main hydraulic pumps to upstroke, increasing the flow. 
2856-3  Main Hydraulic Pump #2 Solenoid: Voltage Above Normal  An increase in current to the negative flow control PRV causes a decrease in NFC hydraulic pressure to the pump regulators. This decrease of NFC pressure to the pump regulators causes the main hydraulic pumps to upstroke, increasing the flow. 
2856-5  Main Hydraulic Pump #2 Solenoid: Current Below Normal  A decrease in current causes an increase in NFC hydraulic pressure which is then sent to the pump regulators. This increase in NFC pressure to the pump regulators causes the main hydraulic pumps to destroke, decreasing the flow. 
2856-6  Main Hydraulic Pump #2 Solenoid: Current Above Normal  An increase in current to the negative flow control PRV causes a decrease in NFC hydraulic pressure to the pump regulators. This decrease of NFC pressure to the pump regulators causes the main hydraulic pumps to upstroke, increasing the flow. 

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 harness is shorted.

  • The Machine ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 5 Diagnostic code are:

  • There is an open in the circuit.

  • The solenoid has failed.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 6 Diagnostic code are:

  • A wire is shorted to ground.

  • The solenoid has failed.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 13 Diagnostic code are:

  • The ECM detects a solenoid that needs calibration.


Illustration 1g06114646
Machine ECM J1 and J2 solenoid connections

Note: The diagrams above are simplified schematics of the Machine ECM and the Switch Panel connections. The schematic is electrically correct. However, not all 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.

Implement ECM 1

The following is a list of codes that are associated with the solenoid valves of the machine.

Table 2
Implement ECM 1 (MID 432) 
DTC  Code Description  System Response 
1986-3  Pump to Bucket Rod End Solenoid: Voltage Above Normal  Bucket functions will be limited. 
1986-5  Pump to Bucket Rod End Solenoid: Current Below Normal  Bucket functions will be limited. 
1986-6  Pump to Bucket Rod End Solenoid: Current Above Normal  Bucket functions will be limited. 
1987-3  Pump to Bucket Head End Solenoid: Voltage Above Normal  Bucket functions will be limited. 
1987-5  Pump to Bucket Head End Solenoid: Current Below Normal  Bucket functions will be limited. 
1987-6  Pump to Bucket Head End Solenoid: Current Above Normal  Bucket functions will be limited. 
1988-3  Pump to Boom Rod End Solenoid: Voltage Above Normal  Boom functions will be limited. 
1988-5  Pump to Boom Rod End Solenoid: Current Below Normal  Boom functions will be limited. 
1988-6  Pump to Boom Rod End Solenoid: Current Above Normal  Boom functions will be limited. 
1989-3  Pump to Boom Head End Solenoid: Voltage Above Normal  Boom functions will be limited. 
1989-5  Pump to Boom Head End Solenoid: Current Below Normal  Boom functions will be limited. 
1989-6  Pump to Boom Head End Solenoid: Current Above Normal  Boom functions will be limited. 
2014-3  Bucket Rod End to Tank Solenoid: Voltage Above Normal  Bucket functions will be limited. 
2014-5  Bucket Rod End to Tank Solenoid: Current Below Normal  Bucket functions will be limited. 
2014-6  Bucket Rod End to Tank Solenoid: Current Above Normal  Bucket functions will be limited. 
2015-3  Bucket Head End to Tank Solenoid: Voltage Above Normal  Bucket functions will be limited. 
2015-5  Bucket Head End to Tank Solenoid: Current Below Normal  Bucket functions will be limited. 
2015-6  Bucket Head End to Tank Solenoid: Current Above Normal  Bucket functions will be limited. 
2016-3  Boom Rod End to Tank Solenoid: Voltage Above Normal  Boom functions will be limited. 
2016-5  Boom Rod End to Tank Solenoid: Current Below Normal  Boom functions will be limited. 
2016-6  Boom Rod End to Tank Solenoid: Current Above Normal  Boom functions will be limited. 
2017-3  Boom Head End to Tank Solenoid: Voltage Above Normal  Boom functions will be limited. 
2017-5  Boom Head End to Tank Solenoid: Current Below Normal  Boom functions will be limited. 
2017-6  Boom Head End to Tank Solenoid: Current Above Normal  Boom functions will be limited. 

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 harness is shorted.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 5 Diagnostic code are:

  • There is an open in the circuit.

  • The solenoid has failed.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 6 Diagnostic code are:

  • A wire is shorted to ground.

  • The solenoid has failed.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 13 Diagnostic code are:

  • The ECM detects a solenoid that needs calibration.


Illustration 2g03530276
Implement ECM 1 solenoid connections

Note: The diagrams above are simplified schematics of the Implement ECM 1 connections. The schematic is electrically correct. However, not all 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.

Implement ECM 2

The following is a list of codes that are associated with the solenoid valves of the machine.

Table 3
Implement ECM 2 (MID 433) 
DTC  Code Description  System Response 
2000-3  Pump to Stick Rod End Solenoid: Voltage Above Normal  Stick functions will be limited. 
2000-5  Pump to Stick Rod End Solenoid: Current Below Normal  Stick functions will be limited. 
2000-6  Pump to Stick Rod End Solenoid: Current Above Normal  Stick functions will be limited. 
2001-3  Pump to Stick Head End Solenoid: Voltage Above Normal  Stick functions will be limited. 
2001-5  Pump to Stick Head End Solenoid: Current Below Normal  Stick functions will be limited. 
2001-6  Pump to Stick Head End Solenoid: Current Above Normal  Stick functions will be limited. 
2008-3  Pump to Attachment #1 Rod End Solenoid: Voltage Above Normal  Attachment functions will be limited. 
2008-5  Pump to Attachment #1 Rod End Solenoid: Current Below Normal  Attachment functions will be limited. 
2008-6  Pump to Attachment #1 Rod End Solenoid: Current Above Normal  Attachment functions will be limited. 
2008-13  Pump to Attachment #1 Rod End Solenoid: Out of Calibration  Attachment functions will be limited. 
2009-3  Pump to Attachment #1 Head End Solenoid: Voltage Above Normal  Attachment functions will be limited. 
2009-5  Pump to Attachment #1 Head End Solenoid: Current Below Normal  Attachment functions will be limited. 
2009-6  Pump to Attachment #1 Head End Solenoid: Current Above Normal  Attachment functions will be limited. 
2009-13  Pump to Attachment #1 Head End Solenoid: Out of Calibration  Attachment functions will be limited. 
2018-3  Stick Rod End to Tank Solenoid: Voltage Above Normal  Stick functions will be limited. 
2018-5  Stick Rod End to Tank Solenoid: Current Below Normal  Stick functions will be limited. 
2018-6  Stick Rod End to Tank Solenoid: Current Above Normal  Stick functions will be limited. 
2018-13  Stick Rod End to Tank Solenoid: Out of Calibration  Stick functions will be limited. 
2019-3  Stick Head End to Tank Solenoid: Voltage Above Normal  Stick functions will be limited. 
2019-5  Stick Head End to Tank Solenoid: Current Below Normal  Stick functions will be limited. 
2019-6  Stick Head End to Tank Solenoid: Current Above Normal  Stick functions will be limited. 
2019-13  Stick Head End to Tank Solenoid: Out of Calibration  Stick functions will be limited. 
2026-3  Attachment #1 Rod End to Tank Solenoid: Voltage Above Normal  Attachment functions will be limited. 
2026-5  Attachment #1 Rod End to Tank Solenoid: Current Below Normal  Attachment functions will be limited. 
2026-6  Attachment #1 Rod End to Tank Solenoid: Current Above Normal  Attachment functions will be limited. 
2026-13  Attachment #1 Rod End to Tank Solenoid: Out of Calibration  Attachment functions will be limited. 
2027-3  Attachment #1 Head End to Tank Solenoid: Voltage Above Normal  Attachment functions will be limited. 
2027-5  Attachment #1 Head End to Tank Solenoid: Current Below Normal  Attachment functions will be limited. 
2027-6  Attachment #1 Head End to Tank Solenoid: Current Above Normal  Attachment functions will be limited. 
2027-13  Attachment #1 Head End to Tank Solenoid: Out of Calibration  Attachment functions will be limited. 

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 harness is shorted.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 5 Diagnostic code are:

  • There is an open in the circuit.

  • The solenoid has failed.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 6 Diagnostic code are:

  • A wire is shorted to ground.

  • The solenoid has failed.

  • The ECM has failed. A failure of the ECM is unlikely.

Possible causes for an FMI 13 Diagnostic code are:

  • The ECM detects a solenoid that needs calibration.


Illustration 3g03530277
Implement ECM 2 solenoid connections

Note: The diagrams above are simplified schematics of the Implement ECM 2 connections. The schematic is electrically correct. However, not all 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.

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 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.

Table 4
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 5 diagnostic code, proceed to Test Step 4.

FMI 6 diagnostic code, proceed to Test Step 7.

FMI 13 diagnostic code, proceed to Test Step 9. 
Begin Process For FMI 3 Troubleshooting HERE 
2. Check The Machine Harness For A Short.

A. Turn the key start switch and the disconnect switch OFF.

B. Disconnect the harness connection at solenoid.

C. If the solenoid is connected to the ECM, disconnect all ECM connectors. If the solenoid is connected to the switch panel, disconnect all switch panel connectors.

D. Measure the resistance of solenoid signal contact to all ECM connectors, if the solenoid is wired directly to the ECM. If the solenoid is wired directly to the switch panel, measure resistance of solenoid contact to all switch panel connectors. 

Each reading is greater than 5K Ω. 
OK - All resistance readings are greater than 5K Ω .

Proceed to Test Step 3.

NOT OK - One or more readings are less than 5 Ω.

Repair: A short exists between the signal contact and the circuit with the low resistance. 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 10. 
3. Check The Operation Of The ECM.

A. Turn the key start switch and the disconnect switch OFF.

B. Use a wire removal tool to remove the solenoid signal wire from the wiring harness connector at the ECM.

C. Reconnect the harness connections at the ECM.

D. Turn the disconnect switch and the key start switch to the ON position.

E. Observe the status of the active diagnostic code. 

The FMI 03 changes to an FMI 05 after the wire is removed. 
OK - The FMI 03 changes to an FMI 05 after the wire is removed. The ECM has responded correctly to the condition of an open circuit. Reinstall the disconnected wire to the correct space in the ECM connector before proceeding.

Proceed to Test Step 10.

NOT OK - The FMI 03 remains active. The status of the active diagnostic code did not change when the wire was disconnected from the ECM.

Proceed to Test Step 10. 
Begin Process For FMI 5 Troubleshooting HERE 
4. Check The Solenoid.

A. Turn the key start switch and the disconnect switch OFF.

B. Disconnect the solenoid from the machine harness.

C. Place a jumper wire between contact 1 and contact 2 at the harness connector for the solenoid.

D. Turn the key start switch and the disconnect switch ON. Do not start the engine.

E. As the jumper is removed and connected to the contacts, observe any code change. 

The code changes to FMI 6 after the jumper wire is installed. 
OK - The circuit is correct. The solenoid has failed.

Repair: Replace the solenoid.

Proceed to Test Step 10.

NOT OK - The diagnostic code remains active.

Proceed to Test Step 5 
5. Check The Machine Harness For An Open.

A. Turn the key start switch and the disconnect switch OFF.

B. Disconnect the harness connectors from the ECM (or switch panel).

C. The jumper wire remains installed.

D. At the machine harness connector for the ECM, measure the resistance at the ECM contacts for the solenoid. 

Each reading is less than 5 Ω. 
OK - The reading is less than 5 Ω, the harness is correct.

Proceed to Test Step 6.

NOT OK - The reading is greater than 5K Ω. The circuit open in the machine harness.

Repair : The open is in the wire for the solenoid signal or the return wire for the solenoid. 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 10. 
6. Check The Operation Of The ECM.

A. Remove the jumper wire that was installed in the last test step.

B. At the connector for the ECM, use a wire removal tool to remove the signal wire from the ECM harness connector.

C. Reconnect the machine harness connectors to the ECM

D. Turn the key start switch and the disconnect switch ON. Do not start the engine.

E. Use a multimeter probe that is NOT connected to a multimeter or a similar device to connect with the ECM. Connect at the signal wire contact through the empty space.

F. Ground the other end of the multimeter probe to frame ground. Observe the status of the diagnostic code 

The code changes to FMI 6 after the jumper wire is installed. 
OK - The circuit is correct, the ECM has responded correctly. The operation of the ECM is correct. Reinstall the disconnected wire into the correct spot in the ECM connector.

Proceed to Test Step 10.

NOT OK - The diagnostic code remains an FMI 5 when the multimeter probe creates a short to ground.

The ECM has not responded correctly to the condition of a grounded circuit. The operation of the ECM is not correct.

Proceed to Test Step 10. 
Begin Process For FMI 6 Troubleshooting HERE 
7. Check The Solenoid.

A. Turn the key start switch and the disconnect switch OFF.

B. Disconnect the solenoid from the machine harness.

C. Unplug the solenoid.

D. Turn the key start switch and the disconnect switch ON. Do not start the engine.

E. As the jumper is removed and connected to the contacts, observe any code change. 

The FMI 6 changes to an FMI 5 diagnostic code 
OK - The circuit is correct. The solenoid has failed.

Repair: Repeat this test to verify solenoid failure. Replace the solenoid.

Proceed to Test Step 10.

NOT OK - The diagnostic code remains active.

Proceed to Test Step 8. 
8. Check Machine Harness For A Short To Ground.

A. The machine harness remains disconnected from the solenoid.

B. Turn the key start switch and the disconnect switch OFF.

C. Disconnect the harness connectors from the ECM (or switch panel).

D. At the harness connector for the ECM, measure the resistance between the solenoid signal contact and all other pins 

Each reading is greater than 5K Ω. 
OK - Machine harness correct.

Proceed to Test Step 10.

NOT OK - One or more of the resistance measurements are less than 5 Ω. A short circuit exists in the machine harness.

Repair: A short circuit exists between the wire for the signal wire of the solenoid and the circuit with the low resistance. 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 10. 
Begin Process For FMI 13 Troubleshooting HERE 
9. Calibration.

A. Perform the calibration procedure for the solenoid.

B. Ensure that the diagnostic code is active.

C. Observe the status of the diagnostic code as the associated components are operated. 

The diagnostic code is inactive. 
OK-The diagnostic code is inactive.

Proceed to Test Step 10.

NOT OK- The diagnostic code is active.

Repair: The diagnostic code remains active. Failure of the ECM is unlikely. Perform calibration for the solenoid again. Also, ensure that the diagnostic code is active for this diagnostic code. If the cause is not found, replace the solenoid and perform the calibration again.

Proceed to Test Step 10. 
10. Check If The Diagnostic Code Remains.

A. Turn the key start switch and the disconnect switch ON.

B. Clear all diagnostic codes.

C. Operate the machine.

D. Stop the machine and engage the safety lock lever.

E. Check if diagnostic code is active. 

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 Communication 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. 

Information System:

C6.6 Industrial Engine Exhaust Gas Valve (NRS) - Remove and Install
C15 and C18 Engines for Caterpillar Built Machines Gear Group (Rear)
C15 and C18 Engines for Caterpillar Built Machines Valve Rocker Arm
C15 and C18 On-Highway Engines Precooler - Remove and Install
C175-16 Engine Fuel Flow Is High
C15 and C18 On-Highway Engines Water Pump - Remove and Install
C15 and C18 On-Highway Engines Inlet and Exhaust Valve Seat Inserts - Remove and Install
C15 and C18 On-Highway Engines Inlet and Exhaust Valve Guides - Remove and Install
C15 and C18 On-Highway Engines Inlet and Exhaust Valves - Remove and Install
C15 and C18 On-Highway Engines Inlet and Exhaust Valve Springs - Remove and Install
C15 and C18 On-Highway Engines Catalyst - Remove and Install
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Solenoid Valve (Switch Controlled) - Test
C15 and C18 On-Highway Engines Combustion Head - Remove and Install
C280-08 Marine Engine Engine Power Ratings
C9 Petroleum Engine Product Description
C15 and C18 On-Highway Engines Air Inlet Elbow - Remove and Install
CX31-P600 Petroleum Transmission General Information
CX31-P600 Petroleum Transmission Transmission Planetary
C280-12 Marine Engine Engine Power Ratings
Installation Procedure For The New Throttle Body Cooling Lines On Certain G3500 Engines{1380}
C280-08 Marine Engine After Stopping Engine
C15 and C18 On-Highway Engines Engine Oil Cooler - Remove and Install - C18
C15 and C18 On-Highway Engines Engine Oil Cooler - Remove and Install - C15
2013/11/13 New Exhaust Temperature Sensor Groups Are Used on Certain 3500, 3600, C175, and C280 Marine and Petroleum Off-Shore Applications {1408, 1900, 1906, 1919, 1921, 1922, 1928, 1929, 7498}