Case IH 22 – Central Controller (XCM) or EHR (Electronic Hitch Control) Control Unit: Draft Sensitivity Control Voltage High

The system is receiving a voltage signal from the draft sensitivity control potentiometer that exceeds the normal operating range. This is typically caused by either a damaged potentiometer or a wiring harness that has shorted to a +12 Volt power source.

• MXM
• MXM 120
• MXM 130
• MXM 140
• MXM 155
• MXM 175
• MXM 190
• Puma
• Magnum
• Steiger
• CX
• MX

1. 1

   Inspect the wiring harness connecting the draft sensitivity control potentiometer to the Central Controller (XCM) for chafed wires, pinched lines, or exposed copper

2. 2

   Use a multimeter to test the potentiometer circuit for a short to +12 Volts

3. 3

   Test the draft sensitivity control potentiometer itself for internal damage, dead spots, or incorrect resistance values

4. 4

   Verify the connections at the Central Controller (XCM) to ensure no pins are bent, corroded, or loose

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to protect the electrical system.

2. 2

   Access the Potentiometer

   Locate the draft sensitivity control knob on the operator's side console or armrest and carefully remove the paneling to access the potentiometer.

3. 3

   Inspect and Repair Wiring

   Disconnect the harness from the potentiometer. If your multimeter tests confirmed a short to +12V in the harness, trace the wire back to the XCM and repair or replace the damaged section of the wiring.

4. 4

   Replace the Potentiometer

   If the wiring is intact, the potentiometer is internally damaged. Remove the retaining nut/screws, pull out the faulty potentiometer, and install the OEM replacement.

5. 5

   Reassemble

   Reconnect the wiring harness, secure the console paneling, and reconnect the battery.

6. 6

   Clear Codes

   Turn the key on and use the tractor's H-Menu or a diagnostic tool to clear the error code.

7. 7

   Calibrate

   Perform the hydraulic lift auto-calibration procedure. This is strictly required on most Case IH models when hitch control components or potentiometers are replaced.

8. 8

   Test

   Operate the tractor and test the draft control system to ensure normal operation and verify that Code 22 does not return.