Case IH 15205 - AST – AST (Advanced Steering / Auto-Steer): Steering valve controller failure - Software program sequence monitoring failure

This indicates an internal software logic error where the controller's program sequence monitoring has detected an anomaly, meaning the software execution loop within the steering controller has failed or crashed.

• MAXXUM T4E
• VESTRUM CVX
• AFS Connect Magnum Tractors (Models 180, 200, 220, 240, 250, 280, 310, 340, 380)
• Vestrum CVX Series Tractors (Models 100, 110, 120, 130)

1. 1

   Enter the diagnostic mode by navigating the 'H' menus using the switches on the instrument cluster.

2. 2

   Navigate to the R1 module, menu H3.

3. 3

   Select the AST system and press the dimming key to accept the menu selection.

4. 4

   Check the lower LCD section of the display for active fault codes (e.g., 15205).

5. 5

   Check for accompanying AST software/communication codes (such as 15206 for CAN bus offline, 15208 for software interpolation incorrect data, or 15212 for software initialization failure) to confirm if the controller is entirely unresponsive or just experiencing a localized software glitch.

1. 1

   Connect Diagnostic Tool

   Connect the Case IH Electronic Service Tool (EST) to the tractor's diagnostic port.

2. 2

   Check Software Versions

   Ping the Steering Valve Controller (SVC) and Steering Redundant Controller (SRC) to check the current software versions.

3. 3

   Reflash/Update Software

   Reflash the controller with the latest OEM software update (e.g., updating to SVC software version 2.02 or newer, depending on the specific machine P.I.N.).

4. 4

   Module Replacement (If Necessary)

   If the EST cannot communicate with the AST subsystem, or if the software reflash fails to resolve code 15205, the physical Steering Valve Controller unit has suffered an internal hardware failure causing the software to crash, and the module must be replaced.

5. 5

   Calibration

   After a reflash or module replacement, perform the Advanced Steering Configuration calibration using the EST to ensure the main and safety controllers are synchronized.