Case IH 15998 – AST (Advanced Steering) Controller or Vehicle Controller (CCM - Cab Control Module): PVED-CLS is configured as present, but PVED-CLS is not detected 'online' or CRC control on at least 1 Operation Status Message fails.

The tractor's main computer expects to communicate with the auto-steering valve actuator over the CAN bus network, but the actuator is either completely unresponsive (offline) or the data packets it is sending are corrupted (failing the Cyclic Redundancy Check / CRC).

• MAXXUM T4E
• VESTRUM CVX
• Case IH Puma series
• Case IH Magnum series
• Case IH Optum series
• Case IH Steiger series
• Case IH Farmall series

1. 1

   Verify Configuration: If the tractor does not have auto-guidance installed, the AST configuration software may be incorrectly programmed. The logic must be updated via the Electronic Service Tool (EST) to set the PVED-CLS to 'not present'.

2. 2

   Inspect the Harness: Check the electrical connector directly at the PVED-CLS steering valve actuator. Look for moisture intrusion, corrosion, or pushed-out pins.

3. 3

   Test Power and Ground: Verify that the PVED-CLS module is receiving proper operating voltage and has a clean ground connection.

4. 4

   Test the CAN Bus: Check the CAN High and CAN Low communication lines between the vehicle controller and the PVED-CLS for continuity, open circuits, or shorts to ground/power.

5. 5

   Check for Related Codes: Look for other CAN bus or steering-related codes (such as 15991, 15993, or 15331) which might indicate a broader network failure or a software mismatch.

1. 1

   Disconnect Power

   Turn off the machine and disconnect the battery to prevent electrical spikes.

2. 2

   Repair Wiring (If Applicable)

   If the diagnostic checks reveal a broken wire or corroded connector at the steering valve, repair the CAN bus wiring harness or replace the pigtail connector.

3. 3

   Replace the Actuator

   If the wiring, power, ground, and CAN bus integrity are all verified to be good, the PVED-CLS actuator has suffered an internal failure and must be replaced.

4. 4

   Install New Module

   Unbolt the faulty PVED-CLS actuator from the Danfoss OSPE steering valve body and install the replacement unit.

5. 5

   Calibrate the System

   Reconnect the battery. Connect the Case IH Electronic Service Tool (EST). You must clear the recorded fault codes and perform a steering system calibration, as the new PVED-CLS module will need to sync with the main controller.