Case IH 150 – Transmission (TRANS) Controller: Front suspension pressure sensor rod side (DA-R) out of range high

The sensor monitoring the hydraulic pressure on the rod side of the front suspension cylinders is sending a voltage signal to the controller that exceeds the maximum expected threshold, typically pointing to an internal sensor failure, a wiring harness shorted to a high-voltage source, or an open ground circuit.

• MX Magnum
• Case IH Magnum Series (235, 260, 290, 305, 315, 340, 380)
• Case IH Steiger Series

1. 1

   Monitor live pressure readings in the 'Trans FSUS' (Front Suspension) menu on the tractor's A-Post display

2. 2

   Perform a zero-pressure test by fully lowering the front suspension; the pressure sensor should read exactly 0 psi right after bottoming out

3. 3

   Inspect the wiring harness and connector at the rod side pressure sensor on the front axle control valve for rubbed wires, corrosion, or a short to power

4. 4

   Attempt a suspended front axle calibration; if the system aborts with a 'cal fail' or 'slow down movement' error, the sensors are likely preventing completion and need replacement

1. 1

   Relieve Pressure

   Safely lower the front suspension completely to relieve all hydraulic pressure in the system. Verify via the A-Post display that the pressure reads 0 psi to ensure safe removal.

2. 2

   Locate the Sensor

   Locate the suspended front axle control valve block, where the pressure sensors are mounted.

3. 3

   Disconnect

   Unplug the electrical harness connector from the rod side (DA-R) pressure sensor.

4. 4

   Remove

   Unthread and remove the faulty pressure sensor from the control valve block. Have a rag ready to catch any residual hydraulic fluid.

5. 5

   Install

   Thread the new pressure sensor into the valve block and tighten it to the OEM specified torque.

6. 6

   Reconnect

   Plug the electrical harness back into the new sensor.

7. 7

   Calibrate

   Initiate and complete a full suspended axle calibration procedure through the tractor's display system so the Transmission controller can learn the new sensor's zero-point.