Case IH 2524 (517971.11) - DEC – UCM: R1 solenoid - circuit fault

The system has detected an electrical circuit malfunction (such as an open circuit, short circuit, or abnormal voltage/resistance) on the R1 synchronizer solenoid circuit.

• VESTRUM CVX
• Puma 165
• Puma 180
• Puma 195
• Puma 210
• Puma 225 CVX
• Magnum 210

1. 1

   Verify that no external power supply is improperly connected and that the tractor's charging system is functioning correctly, as voltage irregularities can trigger circuit faults.

2. 2

   Inspect the R1 solenoid connector for corrosion, pushed-out pins, or moisture.

3. 3

   Check the wiring harness between the UCM and the R1 solenoid for opens, shorts to ground, or shorts to power.

4. 4

   Disconnect the R1 solenoid and measure the resistance between terminal 1 and terminal 2. It should read between 8 to 11 Ohms.

5. 5

   If the wiring, connectors, and solenoid all test within specification, verify the Universal Control Module (UCM) itself, as it may be faulty.

1. 1

   Power down the tractor and locate the R1 synchronizer solenoid on the transmission valve block.

2. 2

   Disconnect the 2-pin electrical connector from the R1 solenoid.

3. 3

   Perform a visual inspection of the wiring harness and the connector (Part # 291718A1). Repair or replace the connector if damaged.

4. 4

   Using a multimeter, test the resistance across the pins of the R1 solenoid.

   If it fails the resistance test (not between 8 - 11 Ohms), remove the retaining hardware and extract the faulty R1 solenoid.

5. 5

   Install the replacement R1 solenoid and torque to OEM specifications.

6. 6

   Reconnect the electrical connector.

7. 7

   Turn the key on and use the diagnostic menu or electronic service tool to clear the stored error code from the UCM.

8. 8

   Test the system for normal operation by engaging the transmission to ensure the R1 synchronizer engages without logging a new fault.