Case IH 2250 (519183.15) - DEC – DEC: Synchro S Solenoid

A "short to high voltage" fault indicates that the electronic control module has detected a voltage on the Synchro S Solenoid circuit that is higher than the expected operating range. In Case IH systems, this typically means the circuit has shorted directly to a +12V power supply. This condition is usually the result of wire harness damage (chafing against a power wire), a failed solenoid coil, or an internal short within the controller.

• MAXXUM T4E
• Steiger
• Magnum
• Puma
• Patriot series

1. 1

   Verify the Concern: Get a clear description of the shifting/drivetrain issue from the operator and, if possible, operate the vehicle to confirm the problem.

2. 2

   Check the Monitor: Use the Diag screens on the Universal Display Plus or AFS Pro 700 monitor to verify if the fault is currently active or stored.

3. 3

   Check for Accompanying Codes: Key ON, Engine OFF. Check for other stored DTC codes. Always diagnose and repair any existing codes starting with the lowest numerical code first.

4. 4

   Visual Inspection: Inspect the wiring harness leading to the transmission valve body for damage, as short to high voltage errors are most frequently caused by harness damage.

5. 5

   Temperature Check: When checking solenoid/relay resistance values, ensure the component is at a reasonable temperature (between +20 and +100 degrees F) to avoid false readings.

1. 1

   Disconnect power

   Turn the key OFF and disconnect the battery ground to prevent further electrical damage.

2. 2

   Isolate the circuit

   Disconnect the electrical connector at the Synchro S Solenoid.

3. 3

   Test the harness

   Reconnect the battery and turn the Key ON. Use a multimeter to test the signal wire at the harness connector. If it reads +12V when it shouldn't, the wiring harness is shorted to power and must be traced and repaired.

4. 4

   Test the solenoid

   Measure the resistance across the pins of the Synchro S Solenoid. If the resistance is out of specification (or shows a dead short), the solenoid has failed internally.

5. 5

   Replace the solenoid

   If the solenoid is faulty, remove the retaining bolts/clips holding it in the transmission valve body. Install the new Synchro S Solenoid and torque the mounting hardware to OEM specifications (generic Case IH drivetrain solenoids are often torqued to 40-55Nm, but verify with your specific model's manual).

6. 6

   Clear codes and test

   Reconnect the harness, clear the fault codes via the cab display, and test operate the machine to ensure the code does not return.