Case IH 15318 – Steering Valve Controller: Steering valve controller failure - Software LVDT calculation out of range

The LVDT (Linear Variable Differential Transformer) sensor inside the electro-hydraulic steering valve measures the physical position of the steering spool. This fault code triggers when the steering controller's software calculates that the signal coming from the LVDT sensor falls outside of its expected, calibrated, or physically possible range. This indicates a mismatch between the commanded steering position and the actual measured position, pointing to a sensor failure, a wiring issue, or a mechanically stuck valve spool.

• Steiger T4B
• MAXXUM T4E
• VESTRUM CVX
• Farmall 40, 45, and 50 Tractors
• Magnum series tractors
• Steiger series tractors
• Puma series tractors
• Maxxum series tractors

1. 1

   Check the diagnostic menu for accompanying circuit codes (such as 15319, 15321, or 15322) to narrow down the issue

2. 2

   Inspect the wiring harness and connectors between the PVED-CLS steering valve controller and the main machine harness for short circuits, open circuits, or corrosion

3. 3

   Verify that the steering valve controller is receiving the correct battery voltage and that the ground level is not above the upper limit

4. 4

   Check if the steering valve spool is mechanically stuck open, closed, or in a transition zone

1. 1

   Secure the Machine

   Park the tractor on a level surface, turn off the engine, and relieve all hydraulic pressure by turning the steering wheel back and forth.

2. 2

   Access the Steering Valve

   Locate the PVED-CLS electro-hydraulic steering valve block on the tractor.

3. 3

   Repair Wiring

   If the diagnostic checks revealed a short or open circuit in the harness leading to the LVDT, repair the damaged wiring or replace the connector pigtail.

4. 4

   Replace the Sensor/Controller

   If the wiring is intact, the LVDT sensor or the entire PVED-CLS steering valve controller has failed internally. Disconnect the electrical connections and hydraulic lines (cap them immediately to prevent contamination). Unbolt and remove the defective steering valve controller/sensor assembly.

5. 5

   Install the New Component

   Mount the replacement PVED-CLS controller or LVDT sensor. Reconnect all hydraulic lines and electrical harnesses.

6. 6

   Bleed the Hydraulic System

   Start the tractor and slowly turn the steering wheel lock-to-lock several times to bleed air from the steering circuit.

7. 7

   Software Calibration

   Connect the Case IH Electronic Service Tool (EST). You must perform a steering valve calibration and configure the vehicle geometry/auto-guidance parameters, as the new PVED-CLS controller must be synced to the tractor's specific steering setup.