Case IH 519009-03 - UCM – UCM: UCM: Front suspension piston pressure sensor voltage high

The front suspension piston pressure sensor is reporting a value that is out of range high, indicating a short circuit to a high voltage source, a broken ground wire (open circuit), or an internally failed sensor.

• MAGNUM AFS Connect
• Puma Series
• Magnum Series
• Maxxum Series
• Farmall / Quantum Series

1. 1

   Visually inspect the piston pressure sensor and its wiring harness for visible damage, excessive tension, or compression.

2. 2

   Ensure the 3-pin electrical connector is securely fastened and the lock catch is truly engaged. Inspect the pins for corrosion or moisture.

3. 3

   Test the signal line and wiring harness for a short to a high voltage source or an open ground circuit.

4. 4

   If the wiring harness tests good, the fault is likely an internal failure of the piston pressure sensor itself.

1. 1

   Power down machine

   Turn off the machine and disconnect battery power before servicing electrical components to prevent further shorts.

2. 2

   Locate the sensor

   Locate the front suspension piston pressure sensor on the front axle suspension hydraulic manifold/cylinder block.

3. 3

   Disconnect sensor

   Unplug the 3-pin female electrical connector from the sensor.

4. 4

   Replace sensor

   If diagnostics point to a failed sensor, unthread the old piston pressure sensor and install the new one. Use authorized sealant/O-rings as required by the manifold design.

5. 5

   Repair harness

   If the connector is damaged, splice in a new 3-pin connector.

6. 6

   Reconnect harness

   Reconnect the harness, ensuring the colored lug/lock catch is fully engaged.

7. 7

   Calibrate suspension

   Clear the UCM fault codes. Perform a front suspension calibration routine via the instrument cluster/display, as replacing suspension sensors can trigger a 'Front suspension not calibrated' state (Code 10014).