John Deere 524235.03 – CCU, ECU, or TDM: MFWD Solenoid Circuit Voltage High

The controller is detecting a higher-than-expected voltage on the circuit responsible for actuating the MFWD clutch solenoid, which usually points to a short-to-power in the wiring harness or an internal failure of the solenoid coil itself.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8225R
• 8245R
• 8270R
• 8295R
• 8320R
• 8335R
• 8345R
• 8370R
• 8400R
• 210LJ Landscape Loader
• 210K EP Tractor Loader
• PowerTech E 4.5 L Diesel Engine
• PowerTech E 6.8 L Diesel Engine

1. 1

   Cycle the MFWD switch off and back on again to attempt a system recovery, as the MFWD is likely stuck in the engaged position.

2. 2

   Inspect the wiring harness leading to the MFWD drop gearbox solenoid for chafed wires that might be shorting to a power source.

3. 3

   Disconnect the MFWD solenoid connector and check for water intrusion, corrosion, or bent pins.

4. 4

   Test the solenoid coil resistance with a multimeter to see if it is out of specification (shorted internally) and probe the harness to verify if voltage is bleeding into the signal wire.

1. 1

   Prep the Machine

   Park the machine on a level surface, turn off the engine, and disconnect the battery to prevent electrical spikes.

2. 2

   Locate the Solenoid

   Locate the MFWD clutch solenoid valve, typically mounted on the MFWD drop gearbox/front axle output housing.

3. 3

   Clean the Area

   Thoroughly clean the solenoid mounting area and surrounding surfaces with a degreaser. It is critical to ensure the area is free from dirt and debris so contaminants do not enter the hydraulic system when the valve is removed.

4. 4

   Disconnect Wiring

   Carefully depress the locking tab and disconnect the wiring harness from the solenoid, taking care not to break the plastic connector.

5. 5

   Remove the Valve

   Remove the retaining hardware holding the solenoid valve in place and pull the valve cartridge out of the manifold/gearbox.

6. 6

   Install the New Part

   Lubricate the O-rings on the new solenoid valve with clean hydraulic fluid. Insert it into the housing and torque the retaining nut/bolts to OEM specifications.

7. 7

   Reassembly

   Reconnect the wiring harness, reconnect the battery, and start the machine. Cycle the MFWD switch to verify the code has cleared and the front-wheel drive engages/disengages properly.