Case IH 741-17 - DEC – Transmission Controller (TCU) / Transmission ECM: Transmission Forward Clutch Solenoid Calibration Fault

The minimum calibration current limit was exceeded or too little current was required to apply the clutch pack. The transmission controller measures the electrical current from the clutch solenoid circuit. If the current draw is outside the expected parameters (e.g., higher than a set limit indicating a short to power, or too low indicating an open circuit or low amps), the controller cannot successfully calibrate the clutch engagement. This can also be caused by excessive backlash in the drivetrain or an issue with the physical clutch assembly/valve.

• MAGNUM AFS Connect
• Magnum 215
• Magnum MX 200
• Gen I / Gen II MX Magnums
• Puma 165
• Puma 180
• Puma 195
• Puma 210
• Puma 225 CVX
• MXU110
• MXU115
• MXU135
• Farmall 95U
• Farmall 105U
• Farmall 115U Pro
• Steiger 9100
• Steiger 9200
• Steiger 9300

1. 1

   Warm the transmission fluid to operating temperature by driving the tractor and shifting through the gears (e.g., 5th through 14th and reverse).

2. 2

   Check regulated pressure using the corner post monitor or a gauge (should be around 2070 kPa at 1000 RPM, or 2300 kPa at 1500 RPM).

3. 3

   Visually inspect the wiring harness (Circuit 4015 - Forward Clutch Solenoid Feed) from the transmission controller to the solenoids under the cab for damage, abnormal routing, or shorts.

4. 4

   Disconnect connectors C350 and C353 from the transmission controller and measure the resistance of the solenoid circuit to check for an open circuit or short to power.

5. 5

   Perform a solenoid swap test by swapping wires between the suspect forward clutch solenoid and another clutch solenoid (like reverse or mid clutch), then rerun calibration to see if the fault follows the wire or stays with the solenoid.

1. 1

   Fluid & Pressure Prep

   Ensure the tractor is parked, the transmission fluid is at operating temperature, and regulated pressure is within spec.

2. 2

   Isolate the Fault

   Perform the solenoid wire swap test mentioned above to determine if the issue is the wiring harness or the solenoid.

3. 3

   Repair Wiring or Replace Solenoid

   If the harness is damaged or shorted, repair the wiring between the TCU and the solenoid. If the solenoid is internally shorted or failing to draw the correct amperage, remove and replace the forward clutch solenoid valve.

4. 4

   Recalibrate the Transmission

   Once the repair is made, perform a transmission calibration. Start the tractor while holding the upshift rocker switch, then within 3 seconds hit the downshift switch (or hold the 2 alternate shift buttons). The dash should display 'CAL'. Place the range lever in neutral, shuttle in forward, and set engine RPMs to 1200. Hold the upshift switch to calibrate the synchronizers (display will count 1 through 5 and show END). Release and hold the upshift switch again to calibrate C1 (it will flash between C1 and the value). Repeat with the downshift switch for C2, and shift into high range to calibrate C3 and C4. Turn the engine off to store the calibration.