Case IH 63 – EDC Microprocessor / Electronic Management Unit (Hitch Controller): EDC Hydraulic Valve Lower Solenoid Open Circuit

This code indicates that the controller has detected an open circuit (a broken wire, disconnected plug, or a burnt-out internal coil) in the circuit for the lower solenoid on the Electronic Draft Control (EDC) hydraulic hitch valve.

• MXM
• MXM Series
• MXM 120
• MXM 130
• MXM 140
• MXM 155
• MXM 175
• MXM 190
• MX Series
• TG Series
• Puma Series
• Magnum Series
• 7100 series
• 7200 series
• Steiger Series

1. 1

   Cycle power by turning the key OFF, then ON to see if the code remains active

2. 2

   Disconnect the hydraulic control valve connector (C218) and measure the resistance of the lower solenoid coil (should be approximately 8 ohms)

3. 3

   Disconnect the EDC microprocessor connector (C127) and check for continuity between the valve connector pins and the microprocessor pins (e.g., C218-2 to C127-19, and C218-1 to C127-27)

4. 4

   Supply 12 volts and ground directly to the lower solenoid pins (do not ground to the control module) with the engine running to test if the hitch lowers mechanically

1. 1

   Ensure Safety

   Lower the 3-point hitch to the ground (if possible) or mechanically support it. Turn off the tractor and disconnect the battery.

2. 2

   Access the EDC Valve

   Locate the EDC hydraulic valve block, typically mounted with the remote control valves at the rear of the tractor.

3. 3

   Wiring Repair

   If step 3 of the diagnostics revealed an open circuit in the harness, trace the wiring from the EDC controller to the valve. Locate the chafed or broken wire, splice in a repair using weather-sealed connectors, and secure the harness away from pinch points.

4. 4

   Solenoid Replacement

   If the coil failed the resistance test, unplug the electrical connector from the lower solenoid.

5. 5

   Remove retaining hardware

   Remove the retaining nut or clip holding the solenoid coil to the valve stem.

6. 6

   Remove old coil

   Slide the old coil off the valve cartridge.

7. 7

   Install new coil

   Slide the new OEM replacement coil onto the stem and secure it with the retaining nut/clip.

8. 8

   Reconnect harness

   Reconnect the electrical harness.

9. 9

   Clear Codes & Calibrate

   Reconnect the battery, start the tractor, and verify the fault code is cleared. You may need to run the hitch calibration procedure via the H-Menu to ensure the EDC valve raise and lower thresholds are properly set.