Case IH 18006 – Armrest: Engine droop control - voltage too high

The control module is receiving a signal voltage from the engine droop control potentiometer that exceeds the maximum expected threshold. This usually points to an open ground circuit on the sensor, a signal wire shorted to a higher voltage source (like 12V), or an internal failure (open circuit) within the potentiometer itself.

• Magnum
• Steiger
• Quadtrac
• Puma
• Farmall
• T7
• T8.xxx Series

1. 1

   Visually inspect the armrest trim, wiring harness, and connector at the engine droop control potentiometer for pinched wires, corrosion, or backed-out pins.

2. 2

   Perform a ground circuit test using a multimeter at the potentiometer connector (an open ground is the most common cause of a voltage too high code).

3. 3

   Test the signal wire for a short to power, such as being shorted to a 12V supply wire within the armrest harness.

4. 4

   Perform a potentiometer resistance test by disconnecting it and measuring resistance across its terminals while turning the knob (should be 1000 Ohms; if OL or erratic, the potentiometer is internally faulty).

1. 1

   Power Down

   Turn off the ignition and disconnect the tractor's battery to prevent accidental short circuits while working inside the armrest.

2. 2

   Access the Component

   Carefully remove the plastic trim panels and retaining screws on the multi-function armrest console to expose the underside of the control switches and potentiometers.

3. 3

   Disconnect

   Locate the engine droop control potentiometer and unplug its electrical connector.

4. 4

   Harness Repair (If Applicable)

   If your diagnostic checks revealed a broken ground or shorted wire in the harness, repair the wiring using appropriate solder/heat-shrink or replacement pins.

5. 5

   Replace the Potentiometer (If Applicable)

   Pull off the external control knob. Remove the retaining nut or screws holding the potentiometer to the armrest housing. Install the new potentiometer (Part # 84213269) and secure it. Reinstall the control knob.

6. 6

   Reassembly

   Plug the electrical connector back into the new potentiometer and carefully reassemble the armrest console trim, ensuring no wires are pinched in the process.

7. 7

   Clear Codes and Test

   Reconnect the battery, turn the key on, and use the tractor's diagnostic menu (or a service tool) to clear the inactive 18006 fault code. Test the engine droop control knob to ensure the voltage sweeps correctly and the code does not return.