New Holland 1076 – EDC: PWM Lower Threshold is Too Low

The Electronic Draft Control (EDC) module has detected an abnormally low Pulse Width Modulation (PWM) signal for the rear three-point hitch's lowering circuit during operation or calibration. The system has detected that the PWM lower threshold is set below the acceptable range, which may affect the proper operation of the controlled component. This typically indicates a problem with the electrical circuit, a faulty solenoid, or a loss of system calibration.

• T-Series
• T6000
• T7000
• T8
• TM Series
• TS Series
• TS-A Series
• TL Series
• Genesis 70 Series
• 8670
• 8870
• 8970

1. 1

   Visually inspect the wiring harness leading to the EDC control valve assembly near the rear hydraulic block for chafed wires, loose connectors, or corrosion (particularly on the 'lower' solenoid connector)

2. 2

   Check the fender-mounted hitch switches to ensure they are not stuck or damaged, which can send conflicting signals

3. 3

   Perform a solenoid electrical test by disconnecting the EDC 'lower' solenoid and measuring resistance across its terminals (expected value is approximately 8 Ohms)

4. 4

   Test the wiring harness voltage by turning the key to 'ON' (engine off) and measuring between the 12V supply pin in the solenoid connector and chassis ground (expected value is approximately 12V). Check Fuse 12 if no voltage is present

5. 5

   Check the hitch position potentiometer for erratic behavior or dead spots by measuring resistance while moving the hitch through its range

1. 1

   Rectify wiring or component faults

   Repair any damaged wiring or replace failed components such as the lower solenoid or position potentiometer based on diagnostic findings.

2. 2

   Clear fault codes

   Use a diagnostic tool or the instrument cluster diagnostic menu (often 'HC') to clear all stored EDC-related fault codes before attempting calibration.

3. 3

   Perform EDC calibration

   With the tractor on level ground, hydraulic oil at operating temperature (20°C-50°C or 60°C-105°C depending on model), parking brake applied, and all other hydraulic and electrical consumers (like air conditioning) turned off, place a 200 kg weight on the lift arms. Enter the diagnostic 'H' menu, navigate to the EDC calibration menu (e.g., H1, H3), and follow the on-screen prompts until 'CF' (Calibration Finished) appears. Turn the key off and wait for a few seconds to allow the controller to store the new calibration values.

4. 4

   Verify operation

   Start the tractor and operate the three-point hitch through its full range of motion to ensure smooth operation and verify that fault code 1076 does not return.