Case IH U72 – Transmission / Steering Controller: Proximity sensor input is out of range - open

The control module is detecting an open circuit or an out-of-range signal from the proximity sensor associated with the steering wheel, specifically within the Fast Steer System (FSS).

• Puma/Mid Range Magnum
• Case IH Puma Series
• Case IH Steiger Series
• Case IH Magnum Series

1. 1

   Verify that the steering wheel is in the correct position, as an incorrect position can falsely trigger this out-of-range code.

2. 2

   Inspect the proximity sensor connector and wiring harness (specifically wire 3172) for an open circuit, broken wires, or corroded pins.

3. 3

   Test the proximity sensor for internal failure using a multimeter to ensure it is sending the correct voltage/resistance back to the FSS control unit.

1. 1

   Power Down

   Turn off the tractor and disconnect the battery to ensure safety while working on the electrical system.

2. 2

   Locate the Sensor

   Access the steering column/Fast Steer System valve block to locate the steering wheel control proximity sensor.

3. 3

   Inspect and Clean

   Disconnect the sensor. Clean the connector pins with electrical contact cleaner and inspect the wiring harness for any visible breaks or chafing.

4. 4

   Perform Continuity Test

   Check for continuity between the sensor connector and the FSS control unit (specifically checking the primary/secondary positive and negative lines).

5. 5

   Replace the Sensor

   If the wiring is intact but the sensor fails testing (or physically shows an open circuit), remove the faulty proximity sensor and install the replacement.

6. 6

   Reassemble and Calibrate

   Reconnect the battery, turn the activation switch off and back on to reset the system. You may need to perform a steering angle sensor / LVDT calibration via the tractor's display monitor to ensure the new sensor is recognized and centered correctly.