Case IH 517959-17 - DEC – Transmission Control Module (TCU): Transmission A2 clutch solenoid minimum calibration current limit exceeded.

The transmission controller measured the electrical current required to actuate the A2 clutch solenoid during a calibration routine and found it to be outside the acceptable parameters (too little current was required to apply the clutch pack, or the current limit was exceeded without a successful calibration solution). This prevents the transmission from properly learning the clutch fill volume and engagement point. It is typically caused by low regulated hydraulic pressure, a failing or shorted A2 clutch solenoid valve, wiring harness issues, or internal physical issues such as excessive backlash or worn clutch discs.

• MAGNUM AFS Connect
• Case IH Magnum AFS Connect Series (Magnum 180, 200, 240, 340, 400)
• Case IH Puma Series (130, 145, 150, 165, 240)
• Case IH Maxxum Series
• Case IH Optum Series

1. 1

   Fluid Temperature Check: Ensure the transmission oil is thoroughly warmed to normal operating temperature.

2. 2

   Hydraulic Pressure Test: Check the regulated transmission pressure (e.g., approximately 2300 kPa at 1500 RPM).

3. 3

   Accumulator Check: Check the nitrogen charge on the regulated circuit accumulator.

4. 4

   Wiring & Continuity Inspection: Remove the controller cover, visually inspect the wiring harness from the transmission controller to the solenoids, and check for circuit continuity, voltage, and current.

5. 5

   Resistance Test: Disconnect the transmission controller connectors and measure the resistance of the A2 clutch solenoid circuit to ensure it is not shorted to power or ground.

1. 1

   Preparation

   Park the tractor on a level surface, engage the parking brake, and turn off the engine. Relieve any residual hydraulic pressure.

2. 2

   Locate the Valve Block

   Locate the transmission hydraulic control valve block (typically mounted on the side or top of the transmission housing, accessible from under the cab).

3. 3

   Disconnect Wiring

   Carefully disconnect the electrical harness connector from the A2 clutch solenoid.

4. 4

   Remove the Solenoid

   Remove the retaining bolts or clips holding the A2 solenoid to the valve block. Pull the solenoid straight out.

5. 5

   Inspect the Spool Valve

   Inspect the bore and the spool valve for any metal debris, scoring, or sticking. Clean the area thoroughly.

6. 6

   Install the New Solenoid

   Lubricate the O-rings on the new OEM solenoid with clean transmission fluid. Insert it into the valve block and torque the retaining bolts to OEM specifications.

7. 7

   Reconnect Wiring

   Reconnect the electrical harness.

8. 8

   Recalibrate

   Start the tractor and warm the transmission fluid to operating temperature. Enter the "TRANS SETUP" menu on the tractor's display (or use the Electronic Service Tool - EST) and initiate the transmission clutch calibration procedure. Ensure the calibration completes without throwing the 517959-17 error.