Case IH 15324 - AST – Steering Valve Controller (PVED-CLS): Steering valve controller - battery voltage below normal operating range.

The supply voltage to the electrohydraulic steering controller has dropped below the acceptable operating threshold (below 9V), which may occur during cranking or the Power-On-Self-Test.

• MAXXUM T4E
• VESTRUM CVX
• Farmall 40
• Farmall 45
• Farmall 50
• Steiger 335
• Steiger 350
• Steiger 370
• Steiger 500
• Steiger 550
• Steiger 580
• Steiger 600
• Steiger 620
• Quadtrac 335
• Quadtrac 350
• Quadtrac 370
• Quadtrac 500
• Quadtrac 550
• Quadtrac 580
• Quadtrac 600
• Quadtrac 620
• Magnum
• Puma

1. 1

   Verify battery is fully charged (12.6V resting) and alternator outputs correct voltage (13.5V - 14.5V) during operation.

2. 2

   Inspect wiring harness supplying power and ground to the PVED-CLS steering valve controller for chafed wires, loose pins, or corrosion.

3. 3

   Perform a voltage drop test directly at the PVED-CLS power connector while cranking and running (look for drops below 9V).

4. 4

   Ensure chassis ground connections for the steering controller are clean and tight.

1. 1

   Disconnect Power

   Disconnect the negative battery cable before servicing the electrical system.

2. 2

   Repair Wiring

   If the diagnostic checks revealed a voltage drop in the harness, repair the damaged wiring or replace the corroded connector pins at the PVED-CLS module.

3. 3

   Clean Grounds

   Remove, clean, and retighten the main chassis grounds and the specific ground wire for the steering controller.

4. 4

   Re-test

   Reconnect the battery and clear the fault codes. (On some models, navigate the H menus on the instrument cluster to the R1 module, menu H3, and select the AST system). Start the tractor and monitor the voltage.

5. 5

   Module Replacement

   If the harness provides a steady 12V+ to the controller under load, but the PVED-CLS still logs code 15324, the controller has an internal hardware fault and must be replaced.

6. 6

   Calibration

   If the PVED-CLS module is replaced, use the diagnostic interface to perform the 'Auto Steering Calibration Mode' to pair the new controller with the tractor's safety and guidance systems.