Case IH 1067 – EDC (Electronic Draft Control) Module: Hydraulic valve supply voltage - voltage too low

The control module is detecting insufficient voltage on the circuit that supplies power to the Electronic Draft Control (EDC) hydraulic valve solenoids. This typically points to a wiring issue, a failing solenoid drawing too much current, or a power supply issue from the controller.

• Puma/Mid Range Magnum
• Maxxum
• Farmall
• Case IH Magnum Series: 215-340, MX series
• Case IH Puma Series: 150, 165, 180, 195, 210, 225 CVX
• Case IH Steiger / STX Series: 280-600
• Case IH Maxxum Series: 110-190, 5120-5250
• Case IH Farmall Series: 115U Pro EP
• Case IH CX Series: CX50-CX100

1. 1

   Verify system voltage to ensure the tractor's battery and alternator are providing proper voltage (12-14V)

2. 2

   Check the fuses and relays that supply power to the hitch control circuit and the EDC module

3. 3

   Inspect the wiring harness and connectors between the EDC/Armrest controller and the hitch control valve for chafed wires shorting to ground, pinched wires, or corroded pins

4. 4

   Perform a voltage drop test by disconnecting the harness at the EDC hydraulic valve solenoids, turning the key ON, and measuring supply voltage at the connector

5. 5

   Measure the resistance of the raise and lower solenoids on the hitch valve to check for an internal short pulling the circuit voltage down

1. 1

   Disconnect Power

   Turn off the battery disconnect switch or disconnect the negative battery cable to prevent electrical spikes.

2. 2

   Repair Wiring

   If the diagnostic checks revealed a damaged harness or corroded connector, splice in new wiring or replace the damaged connector pigtail.

3. 3

   Locate Valve

   If the wiring is intact but the solenoid failed the resistance test, locate the EDC hitch control valve at the rear of the tractor.

4. 4

   Remove Solenoid

   Remove the retaining nut holding the faulty solenoid coil to the valve stem.

5. 5

   Install New Solenoid

   Slide the old solenoid off and install the new OEM replacement solenoid. Torque the retaining nut to the specification listed in your specific model's service manual.

6. 6

   Reconnect Harness

   Reconnect the electrical harness to the solenoid.

7. 7

   Reassemble and Clear Codes

   Reconnect the battery and turn the key ON. Clear the stored fault codes from the controller.

8. 8

   Perform Calibration

   Perform the Hydraulic Lift Autocalibration (EDC Calibration) procedure. Follow the H-Menu or display prompts to recalibrate the hitch limits and draft pins.