Case IH 9069 - UCM – UCM: Short circuit to 12V on front hitch 14bar accumulator solenoid

The system has detected an electrical fault where the circuit controlling the front hitch 14bar accumulator solenoid is improperly receiving a continuous 12 volts of power, indicating a higher current than normal is flowing through the system.

• VESTRUM CVX
• Maxxum series (110 EP to 140 EP)
• Magnum series (MX Magnum, Magnum 235-340)
• T7/T8 equivalents
• Axial-Flow Combines 2166
• Axial-Flow Combines 2188
• Axial-Flow Combines 2366
• Axial-Flow Combines 2388

1. 1

   Ensure the power to the system is turned off before testing.

2. 2

   Visually inspect the wiring harness and connectors running between the UCM and the front hitch accumulator solenoid for pinched, corroded, or damaged wires.

3. 3

   Use a multimeter to test the wiring harness for a short circuit to the 12V power supply.

4. 4

   Test the accumulator solenoid coil to determine if the short circuit is internal to the component.

1. 1

   Disconnect power

   Disconnect the machine's battery/power source.

2. 2

   Repair or replace wiring harness

   If the multimeter test reveals a harness issue, repair or replace the damaged sections of the wiring harness that are shorting to the 12V source.

3. 3

   Replace solenoid coil or assembly

   If the short is internal to the solenoid, replace the 12V coil or the entire accumulator solenoid valve assembly.

4. 4

   Test system

   Reconnect power, clear the fault codes from the UCM, and road/field test the vehicle to ensure the front hitch operates correctly and the code does not return.