Case IH 1002 – EDC: Raise Hitch Valve Coil Circuit Failure

The Electronic Draft Control (EDC) unit has detected an electrical fault in the circuit responsible for raising the hitch. The system is registering either a short to a 12-volt power source or a general open circuit failure in the wiring leading to the hitch raise solenoid valve.

• Magnum
• Steiger T4B
• Puma
• Farmall

1. 1

   Visually inspect the wiring harness leading to the hitch raise solenoid for visible damage, rubbing, or broken wires.

2. 2

   Verify that connectors at both the hitch raise valve coil and the EDC/Hitch ECU are fully installed, undamaged, and have tight fitting pins.

3. 3

   Perform a harness flex test by flexing the involved wiring harnesses while the machine is keyed on, monitoring the cab display for intermittent faults.

4. 4

   Disconnect the harness from the ECU and solenoid, then use a multimeter to check for continuity and test for a short to a 12V power source.

5. 5

   Test the internal resistance of the raise hitch valve coil to ensure the solenoid has not failed internally and shorted out.

1. 1

   Relieve hydraulic pressure

   Ensure the engine is off, the tractor is blocked, the hitch is fully lowered or mechanically supported, and hydraulic pressure is relieved before working on valves.

2. 2

   Repair wiring harness

   If diagnostic checks reveal a damaged wire or a loose/corroded connector pin, repair the wiring harness or splice in a new connector pigtail.

3. 3

   Replace solenoid valve assembly

   If the coil is internally shorted or open, disconnect the electrical harness, remove the retaining nut or unbolt the valve body, replace O-rings using a new seal kit, and install the new valve tightened to OEM torque specs.

4. 4

   Clear fault codes

   Use the electronic display or a diagnostic scan tool (such as Jaltest or Case EST) to erase the fault code.

5. 5

   Test hitch operation

   Operate the machine and cycle the hitch to verify that the error has been resolved and the hitch raises smoothly.