Case IH 2220 (6153.15) - DEC – DEC (Drivetrain Electronic Controller): Synchro 2 Solenoid - short to high voltage

The controller is detecting a 'short to high voltage' on the Synchro 2 Solenoid circuit, which usually points to a wiring harness shorting to a power source (like the battery positive/VCC) or an internal failure.

• MAXXUM T4E

1. 1

   Check the wiring harness connecting the DEC/Transmission controller to the Synchro 2 Solenoid for chafing, melted insulation, or pinched wires that could cause a short to a 12V power source.

2. 2

   Inspect the connectors at both the solenoid and the controller for corrosion, moisture, or bent pins.

3. 3

   Test the solenoid circuit with a digital multimeter to verify if the short to high voltage is present in the wiring harness or if it is internal to the solenoid coil.

4. 4

   Use the tractor's diagnostic menu (such as the 'H' menu screens on Case IH central displays) to monitor the synchro solenoid channel and verify the live voltage/status.

1. 1

   Disconnect battery

   Disconnect the battery to prevent further electrical damage.

2. 2

   Repair or replace wiring harness

   Repair or replace the damaged section of the transmission wiring harness if a short to power is found.

3. 3

   Replace solenoid

   Replace the Synchro 2 Solenoid if it has failed internally.

4. 4

   Re-calibrate synchronizers

   Re-calibrate the transmission synchronizers (e.g., using the tractor's calibration mode) after replacing the solenoid or repairing the circuit, as the controller will need to relearn the synchro engagement points.