Case IH 2256 (519184.15) - DEC – DEC: Synchro M Solenoid - short to high voltage

The controller is detecting a voltage on the solenoid's circuit that is higher than the expected operating range, which typically points to a wiring harness shorting to a power source, a failed solenoid internal coil, or a controller issue.

• MAXXUM T4E

1. 1

   Inspect the transmission wiring harness leading to the Synchro M Solenoid. Look for burned wires, rubbed or busted insulation, or connectors that are damaged or loose.

2. 2

   Disconnect the Synchro M Solenoid and inspect the pins for corrosion, moisture, or bent terminals.

3. 3

   With the key on and the solenoid disconnected, use a multimeter to check the signal wire for unexpected voltage (which would confirm a short to power in the harness).

4. 4

   Measure the resistance (Ohms) across the Synchro M Solenoid pins and compare it to OEM specifications to determine if the solenoid itself has failed internally.

1. 1

   Repair wiring harness

   Locate the damaged section of the wiring harness and repair/splice the wire.

2. 2

   Replace solenoid

   Replace the Synchro M Solenoid if it has failed internally.

3. 3

   Clear fault codes

   Clear the inactive fault codes from the DEC using a diagnostic tool (such as the Case IH Pro 1200 monitor or Jaltest diagnostic kit) after the repair is complete.