New Holland TMF 131 – TMF (Tractor Multi-Function): Aux 3rd Lower Coil solenoid shorted to 12 volts.

The control module has detected current on the auxiliary #3 driver circuit (specifically the retract/lower coil) while the driver is commanded OFF. This indicates that the circuit is receiving unintended 12-volt power, typically due to a short to a 12V power source in the wiring harness or an internal short within the solenoid coil itself.

• New Holland TG Series (e.g., TG215, TG245)
• New Holland T8000 Series (e.g., T8010, T8030, T8040)
• New Holland T6 Series
• New Holland T7 Series
• New Holland T8 Series
• New Holland T9 Series
• New Holland MXM / TM Series

1. 1

   Visual Inspection: Inspect the wiring harness leading to the Aux 3 remote valve block at the rear of the tractor. Look for pinched wires, melted insulation, or chafing that could cause the solenoid signal wire to touch a constant 12V power wire.

2. 2

   Harness Voltage Test: Disconnect the electrical connector at the Aux 3 lower/retract solenoid. Turn the key ON but leave the Aux 3 control switch in the neutral/off position. Use a multimeter to probe the signal wire on the harness side. If 12 volts are present, the wiring harness is shorted to power and must be traced and repaired.

3. 3

   Solenoid Coil Test: If the harness shows no voltage when off, test the resistance (Ohms) across the pins of the Aux 3 lower solenoid coil. Compare the reading to a known good coil (such as the Aux 1 or Aux 2 solenoids). A reading of near-zero ohms indicates the coil is internally shorted.

1. 1

   Power Down

   Turn off the tractor, remove the key, and disconnect the negative battery cable to prevent electrical spikes.

2. 2

   Access the Valve Block

   Locate the electro-hydraulic remote valve stack at the rear of the tractor. Identify the Aux 3 slice (usually the third valve from the left or top, depending on orientation).

3. 3

   Remove the Faulty Solenoid

   Disconnect the wiring harness from the Aux 3 lower/retract solenoid. Remove the retaining nut or screws holding the solenoid coil to the valve cartridge.

4. 4

   Install the New Solenoid

   Slide the new solenoid coil over the valve stem and secure it with the retaining nut. Do not overtighten, as this can distort the cartridge.

5. 5

   Reconnect and Test

   Reconnect the wiring harness. Reconnect the battery. Start the tractor and operate the Aux 3 remote switch in both the raise and lower directions to verify proper hydraulic flow.

6. 6

   Clear Codes

   Use the tractor's diagnostic menu or a service tool to clear the TMF 131 inactive fault code from the Tractor Multi-Function controller memory.