Case IH 564-03 - DEC – DEC: Voltage Above Normal, Or Shorted To High Source

The control module has detected that the electrical circuit supplying the MFD clutch solenoid has a voltage reading higher than the normal operating range, which typically points to a short circuit to a positive voltage source (battery voltage) or an open circuit in the wiring harness.

• MAGNUM AFS Connect
• 7130
• 7210
• 7220
• 8940
• 8950
• MX210
• MX230
• MX255
• MX285
• MX305
• 5240
• MX80C
• MX90C
• MX100C
• MX100
• MX110
• MX120
• MX135
• MX150
• MX170
• CX50
• CX60
• CX70
• CX80
• CX90
• CX100
• C50
• C60
• C70
• C80
• C90
• C100

1. 1

   Trace the wiring harness from the DEC module to the MFD clutch solenoid. Look for rubbed, chafed, or melted wires that could be shorting to a high voltage source.

2. 2

   Inspect the electrical connector at the MFD solenoid (e.g., connector X-160) for damaged pins, pushed-out terminals, or moisture intrusion.

3. 3

   Use a multimeter to test the solenoid circuit for a short to voltage. Disconnect the solenoid and check if the voltage on the signal wire remains high.

4. 4

   Measure the resistance of the MFD clutch solenoid coil to verify it is not internally shorted.

1. 1

   Prepare machine

   Park the tractor on a level surface, engage the park brake, and turn off the engine.

2. 2

   Locate solenoid valve

   Locate the MFD clutch solenoid valve, which is typically mounted on the transmission solenoid valve tubes or the MFD transfer gearbox.

3. 3

   Disconnect electrical connector

   Disconnect the electrical connector from the solenoid.

4. 4

   Clean surrounding area

   Clean the surrounding area to prevent dirt from entering the hydraulic system.

5. 5

   Remove retaining bolts

   Remove the retaining bolts (e.g., M6 x 35 or M6 x 50 bolts) securing the solenoid valve assembly.

6. 6

   Extract old solenoid valve

   Extract the old solenoid valve and discard the old O-rings.

7. 7

   Lubricate and install O-rings

   Lubricate the new O-rings (e.g., 8-1, 12-1, or 6-1 O-rings) with clean hydraulic fluid and install them on the new valve.

8. 8

   Insert new solenoid valve

   Insert the new solenoid valve assembly into the housing and tighten the retaining bolts.

9. 9

   Reconnect electrical connector

   Reconnect the electrical connector.

10. 10

    Test and verify

    Start the tractor, test the MFD engagement, check for hydraulic leaks, and clear the fault code.