CLAAS Id7652h / 7652h (451) – TR2 (A57-2) Transmission Module: The actual current measured on the solenoid valve SV1 return is less than the setpoint value

The transmission control system is commanding the SV1 solenoid valve (which controls the ratio under torque in the transmission) to open or close, but the electrical current returning to the module is lower than the expected target (setpoint). This typically indicates high resistance, an open circuit in the wiring harness, a short to ground, or a failed solenoid coil.

• Axion 810
• Axion 820
• Axion 840
• Axion 850
• Arion 410
• Arion 420
• Arion 430
• Arion 510
• Arion 530
• Arion 550
• Arion 610
• Arion 620
• Arion 630
• Arion 640
• Arion 650
• Ares 567
• Ares 657
• Ares 697

1. 1

   Check for a possible open circuit in the solenoid valve supply harness

2. 2

   Check for a possible short circuit to earth (ground) on the solenoid valve circuit

3. 3

   Inspect and test the solenoid valve SV1 (Y335-1)

4. 4

   Test the 'Auto 5' module using CLAAS diagnostic tool n° 60 05 033 249 to rule out an internal module failure

1. 1

   Preparation

   Park the tractor on a level surface, engage the parking brake, and turn off the ignition.

2. 2

   Locate the Valve

   Locate the transmission valve block (Hexashift module). Identify the SV1 'Ratio under torque' solenoid valve using the component identifier Y335-1.

3. 3

   Inspect Wiring

   Disconnect the electrical connector at the SV1 solenoid. Inspect the pins for corrosion, pushed-out terminals, or moisture. Trace the wiring harness back to the TR2 (A57-2) module, looking for chafed wires or breaks.

4. 4

   Test Continuity and Resistance

   Use a multimeter to measure the resistance across the pins of the SV1 solenoid coil. If the circuit is open (infinite resistance) or shorted, the solenoid is defective. Test the harness wires for continuity between the TR2 module connector and the SV1 connector. Test both wires for a short to ground.

5. 5

   Replace Faulty Component

   If the wiring is damaged, repair or replace the harness. If the SV1 solenoid fails the resistance test, replace the solenoid valve.

6. 6

   Module Testing (If necessary)

   If the wiring and solenoid test perfectly, the fault may lie within the transmission module. Connect CLAAS tool n° 60 05 033 249 to test the 'Auto 5' module and replace it if required.

7. 7

   Clear Codes

   Reconnect all components, turn on the ignition, clear the fault codes using a diagnostic scanner, and test the transmission operation to ensure the code does not return.