New Holland TMF 149 – TMF: Implement feedback #2 out of range High

The control module is receiving a voltage signal from the implement feedback sensor #2 (typically a potentiometer monitoring hitch or remote valve position) that exceeds the maximum acceptable threshold (usually >4.5V on a 5V reference circuit). This condition is most commonly caused by an open ground circuit, a short to a power source on the signal wire, or an internally failed sensor.

• TG Series (TG210, TG230, TG255, TG285)
• T8 Series
• T9 Series

1. 1

   Visually inspect the wiring harness and connectors leading to the implement feedback sensor #2 for chafing, corrosion, or backed-out pins.

2. 2

   Use a digital multimeter to verify that the sensor is receiving the correct 5V reference supply.

3. 3

   Check the sensor's ground circuit for high resistance or an open condition. (An open ground is the most common reason a sensor signal gets pulled "High" out of range).

4. 4

   Test the signal wire for a short to voltage (either 5V or 12V).

5. 5

   If the wiring harness tests good, test the sensor itself by measuring its resistance sweep to see if the potentiometer has failed internally.

1. 1

   Turn off the tractor key and disconnect battery power if harness repairs are required.

2. 2

   Disconnect the harness from the implement feedback sensor #2.

3. 3

   Repair any broken wires, open grounds, or shorted wires found during the diagnostic phase.

4. 4

   If the harness is intact and the sensor is deemed faulty, unbolt and remove the implement feedback sensor.

5. 5

   Install the replacement sensor and securely reconnect the wiring harness.

6. 6

   Restore battery power, turn the key on, and clear the TMF 149 fault code using the cab monitor or diagnostic tool.

7. 7

   Perform the implement/hitch position calibration procedure as outlined in the operator's manual to teach the controller the new sensor's voltage range.