Case IH 519008-04 - UCM – UCM: Front suspension rod pressure sensor voltage low

The sensor monitoring the hydraulic pressure on the rod side of the front suspension cylinder is sending a voltage signal to the controller that is below the expected normal operating range. This typically points to a short to ground in the wiring, a failed sensor, or a disconnected harness.

• MAGNUM AFS Connect
• Magnum 180
• Magnum 200
• Magnum 210
• Magnum 215
• Magnum 245
• Magnum 275
• Magnum 305
• Magnum 340
• Puma 155
• Puma 180
• Puma 185
• Puma 260 CVX
• Maxxum 115

1. 1

   Check the Display / EST Readings: Navigate to the Transmission/Front Suspension view pressure page and check the rod pressure reading.

2. 2

   Perform a Zero-Pressure Test: Relieve all pressure in the system by tightening down the manual bleed/thumb screws on the suspension valve block. The sensor should read near zero (below 40 psi / 275 kPa). If it reads artificially high or low, the sensor is likely faulty.

3. 3

   Perform a Sensor Swap Test: Swap the rod pressure sensor with the piston pressure sensor. If the fault code changes to the piston side, the sensor is faulty. If the fault remains on the rod side, the issue is in the wiring.

4. 4

   Inspect Wiring & Connectors: Inspect the 3-pin electrical connector at the rod pressure sensor for broken locking tabs, pushed-out pins, or water/dirt ingress.

1. 1

   Depressurize the System

   Lower the front suspension completely. Open the manual bleed valves (or tighten the thumb screws, depending on the specific valve block design) to release all hydraulic pressure from the front suspension accumulators and cylinders. Do not remove the sensor while the system is under pressure.

2. 2

   Disconnect Wiring

   Unplug the 3-pin electrical connector from the rod pressure sensor.

3. 3

   Remove the Sensor

   Unscrew the faulty rod pressure sensor from the suspension hydraulic valve block.

4. 4

   Install the New Sensor

   Thread the new pressure sensor into the valve block and tighten to the manufacturer's specified torque.

5. 5

   Repair Connector (If Necessary)

   If the wiring harness connector is damaged, splice in a replacement 3-pin connector housing (Part # 87695580).

6. 6

   Restore System

   Close the manual bleed valves/thumb screws.

7. 7

   Calibrate

   Start the tractor and use the A-post display or EST to perform a Front Suspension Calibration. Verify that the suspension raises, the fault code clears, and the system operates normally.