Case IH 1007 – Hitch Controller, Hydraulic Controller, or Armrest Controller Module (ACM) / Electronic Draft Control (EDC): Slip control potentiometer - signal too high (or voltage too high)

The signal voltage returning from the slip control potentiometer to the controller has exceeded the maximum allowable threshold. This is usually caused by a short circuit to a power source, an open circuit on the potentiometer's ground wire, or an internal failure within the potentiometer itself.

• Puma/Mid Range Magnum
• Maxxum
• Farmall
• Puma series
• Maxxum series
• Farmall series
• Steiger / Quadtrac series
• Magnum (235-340 Series 4)

1. 1

   Visually inspect the slip control knob on the EDC panel or Multicontroller armrest for physical damage.

2. 2

   Disconnect the potentiometer and inspect the harness connector for pushed-out pins, corrosion, or moisture, which can bridge the 5V reference to the signal wire.

3. 3

   Using a multimeter, verify that the potentiometer is receiving a solid ground (a broken ground wire is the most common cause of a signal too high code).

4. 4

   Turn the key ON (engine off) and verify the reference wire has exactly 5V. Check the signal wire for any voltage; if it reads 12V, there is a short to battery power in the harness.

5. 5

   Measure the resistance of the potentiometer through its full sweep. If the resistance drops out or reads open (infinite ohms) at any point, the potentiometer is internally defective.

1. 1

   Power Down

   Turn off the ignition key and disconnect the tractor's battery to prevent electrical spikes.

2. 2

   Access the Potentiometer

   Remove the retaining screws and trim panels on the Multicontroller armrest or the right-hand EDC console to access the underside of the control panel.

3. 3

   Remove the Faulty Sensor

   Pull the plastic knob off the top of the slip control potentiometer. Disconnect the 3-pin wiring harness from the bottom of the sensor. Remove the retaining nut holding the potentiometer to the console bracket.

4. 4

   Install the New Part

   Insert the new potentiometer through the console, align the indexing tab, and tighten the retaining nut. Push the control knob back onto the splined/D-shaped shaft.

5. 5

   Reassemble

   Reconnect the 3-pin wiring harness. Reinstall all armrest/console trim panels.

6. 6

   Test and Clear Codes

   Reconnect the battery. Turn the key to the ON position and use the tractor's diagnostic menu (or a dealer scan tool) to clear the inactive 1007 fault code. Test the slip control knob to ensure the error does not return.