Case IH 64 – Electronic Management Unit (EMU) or Central Controller (XCM): EDC Hydraulic Valve Raise Solenoid Open Circuit

The Electronic Draft Control (EDC) system manages the rear 3-point hitch. This code indicates that the controller has detected a break in electrical continuity (an open circuit) in the wiring or the internal coil of the solenoid responsible for raising the hitch.

• MXM
• MXM Series
• MXM 120
• MXM 130
• MXM 140
• MXM 155
• MXM 175
• MXM 190
• MXU Series
• Maxxum Series
• Puma Series
• Magnum Series

1. 1

   Cycle power (Key OFF, Key ON) and retest to see if the code is active or stored

2. 2

   Inspect connections at the EDC hydraulic control valve block (connector C217) for corroded, pushed-back, or broken pins

3. 3

   Measure resistance across the pins for the raise solenoid coil using a multimeter (an infinite/OL reading confirms the coil is internally open)

4. 4

   Check the wiring harness for a break or chafe between the EMU/XCM and the valve connector if the coil tests within normal resistance

1. 1

   Depressurize

   Ensure the tractor is parked on a level surface, the engine is off, and the rear hitch is fully lowered to relieve hydraulic pressure in the circuit.

2. 2

   Disconnect

   Unplug the electrical harness from the EDC raise solenoid.

3. 3

   Remove Solenoid

   Remove the retaining nut or fastener holding the solenoid coil to the EDC valve cartridge. Slide the faulty coil off the valve stem. (Note: On some specific valve blocks, the OEM does not sell the coil separately, requiring the replacement of the entire EDC control valve assembly).

4. 4

   Install New Part

   Slide the new solenoid coil onto the stem and secure it, or bolt the new EDC valve block into place if replacing the whole assembly.

5. 5

   Reconnect

   Plug the electrical harness back in.

6. 6

   Calibrate

   Start the tractor. You must perform the EDC Valve Solenoid Calibration procedure via the tractor's H-Menu or diagnostic tool to teach the EMU the current draw and engagement thresholds of the new solenoid.

7. 7

   Test

   Operate the rear hitch raise/lower switch to confirm the fault code is cleared and the hitch functions properly.