Case IH 2262 (519185.15) - DEC – DEC (Drivetrain Electronic Controller): Synchro F Solenoid Short to High Voltage

The controller is detecting a voltage on the solenoid's control or ground circuit that is higher than expected. This condition is typically caused by a wiring harness chafing and shorting against a 12V power wire, or an internal short-circuit within the solenoid coil itself.

• MAXXUM T4E
• Case IH CX Series: CX50, CX60, CX70, CX80, CX90, CX100
• Case IH Magnum Series: 225, 235, 250, 255, 260, 280, 290, 305, 310, 315, 335, 340, 370, 380
• Case IH Maxxum / MX Series: MX80C, MX90C, MX100, MX110, MX120, MX135, MX150, MX170, MX180, MX200, MX210, MX220, MX240, MX255, MX270, MX285
• Case IH Puma Series: 170 and similar Tier 2/Tier 3 models
• Case IH Steiger & Quadtrac: 350 through 620

1. 1

   Visual Harness Inspection: Trace the wiring harness from the DEC to the Synchro F solenoid on the transmission valve block. Look for pinched wires, melted insulation, or chafing that could cause the control wire to short against a 12V power source.

2. 2

   Coil Resistance Test: Disconnect the 2-pin plug from the solenoid. Use a multimeter to measure the resistance across the two pins on the solenoid coil. A healthy OEM coil should read approximately 6.8 Ohms. If it reads significantly lower or zero, the coil is internally shorted and must be replaced.

3. 3

   Connector Inspection: Check the 2-pin connector for water ingress, corrosion, or bent pins that could be bridging the circuits.

4. 4

   Voltage Check: With the solenoid disconnected and the key ON, measure the voltage at the harness connector. If 12V is present on the ground/control circuit when it shouldn't be, the short to power is located in the wiring harness, not the solenoid.

1. 1

   Disconnect power

   Turn off the machine, remove the key, and disconnect the negative battery cable to prevent accidental shorting.

2. 2

   Locate solenoid

   Locate the Synchro F solenoid on the transmission/drivetrain control valve block.

3. 3

   Unplug connector

   Unplug the 2-pin electrical connector from the solenoid.

4. 4

   Remove retaining nut

   Remove the retaining nut or bolt holding the solenoid coil to the valve stem.

5. 5

   Remove faulty coil

   Slide the faulty solenoid coil off the valve cartridge (you typically do not need to remove the hydraulic cartridge itself, preventing fluid loss).

6. 6

   Install new coil

   Slide the new solenoid coil onto the valve stem and tighten the retaining nut.

7. 7

   Reconnect electrical connector

   Reconnect the 2-pin electrical connector, ensuring the weather seal clicks into place.

8. 8

   Test and clear codes

   Reconnect the battery, clear the fault codes from the DEC using a diagnostic tool or the machine's display, and test the transmission/shuttle operation to verify the repair.