Case IH 15666 - AST – AST: Steering not calibrated

This condition occurs when the advanced steering system detects that the required calibration parameters for the wheel angle sensor and the electro-hydraulic steering spool have not been successfully completed or saved.

• MAXXUM T4E
• VESTRUM CVX
• Steiger
• Magnum
• Puma
• Optum
• Farmall
• Patriot 3230
• Patriot 3320
• Patriot 3330
• Patriot 4420
• Patriot 4430
• Axial-Flow Flagship

1. 1

   Verify module communication: Ensure the PVED-CLS controller is detected online to rule out CAN bus communication issues or a dead module.

2. 2

   Check for related fault codes, such as 15667 (Timeout of steering angle sensor CAN message).

3. 3

   Inspect the Wheel Angle Sensor (WAS): Ensure it is physically intact, the linkage is not bent, and it outputs approximately 2.50V when centered.

4. 4

   Check the electro-hydraulic steering spool: Ensure it is functioning and there are no active hydraulic faults, as the spool must physically move during calibration.

1. 1

   Enter Diagnostic/Calibration Mode

   Via Instrument Cluster: Navigate the 'H' menus using the switches on the instrument cluster. Go to the R1 module, menu H2, and press the dimming key to accept. Alternatively, via AFS Pro Display / Autopilot Toolbox: Navigate to Tools / Setup and Diagnostics, click the Calibration Tab, and select Auto Steering Calibration Mode.

2. 2

   Calibrate the Wheel Angle Sensor (WAS)

   Follow the on-screen prompts to turn the steering wheel fully to the left lock, right lock, and center. The system must successfully register and save these limits.

3. 3

   Calibrate the Steering Spool

   Initiate the spool calibration, which will automatically actuate the steering valve to learn the hydraulic flow parameters. Note: Spool calibration is only allowed once the WAS calibration has been successfully completed.

4. 4

   Finalize calibration

   Save the calibration values, exit the diagnostic menu, and cycle the key. The 15666 fault code should now move to an inactive state and can be cleared.