Case IH 2707 (518372.17) - DEC – DEC: HST CUTOFF Solenoid - LSD short to GND

The Hydrostatic Transmission (HST) Cutoff Solenoid has a Low-Side Driver (LSD) short to ground. The wiring between the solenoid and the control module, or the module's internal driver itself, is unintentionally touching a ground source, which can cause the solenoid to remain continuously energized or force the module to shut down the circuit.

• VESTRUM CVX
• Farmall Compact series tractors
• Maxxum
• AFS Connect Magnum tractors

1. 1

   Unplug the connector at the HST Cutoff Solenoid to isolate the circuit

2. 2

   With the solenoid unplugged, check the ground-control wire running from the solenoid connector back to the DEC module for continuity to chassis ground (indicates a chafed wire shorted to the frame)

3. 3

   Test the internal resistance of the HST Cutoff Solenoid to ensure the coil itself has not internally shorted to its own casing

4. 4

   If the wiring harness and solenoid are intact, suspect the internal low-side driver inside the DEC module is stuck or damaged

1. 1

   Repair wiring

   Repair the chafed wire in the transmission harness.

2. 2

   Replace solenoid

   Replace a shorted HST Cutoff Solenoid.

3. 3

   Replace module

   Replace a failed DEC module.