Case IH 15328 - AST – AST: SASA disconnected from OSPED

Loss of communication, physical disconnection, or CAN signal failure between the SASA steering wheel sensor and the OSPED steering valve controller.

• MAXXUM T4E
• VESTRUM CVX
• Puma 150
• Puma 165
• Puma 175
• Puma 185
• Puma 200
• Puma 220
• Puma 240
• Maxxum 110
• Maxxum 145 CVXDrive
• Magnum 180
• Magnum 200
• Magnum 215
• Magnum 250
• Magnum 280
• Magnum 310
• Magnum 340
• Magnum 380
• Magnum 400
• Steiger Series
• Quadtrac Series
• Farmall 115U
• Farmall C Series

1. 1

   Inspect the physical wiring harness and connectors between the SASA sensor and the OSPED steering valve/PVED-CLS controller for broken wires or corroded pins

2. 2

   Verify the supply voltage to the SASA sensor (requires 6–36 VDC or 9–32 VDC depending on the sensor version)

3. 3

   Check the CAN V2.0B (J1939) signal output from the SASA sensor to ensure it is broadcasting properly and is not shorted

4. 4

   Check for concurrent codes in the AST module, such as 15329 (Wheel Angle Sensor - CAN signal exceeds calibration limit) or 15667 (Timeout of steering angle sensor CAN message)

5. 5

   If the steering spool is physically moving without command, inspect the OSPED valve's dynamic orifice, pilot pressure relief valve, and spool/sleeve set for hydraulic contamination or a stuck valve

1. 1

   Power Down

   Turn off the machine and disconnect the battery to ensure the PVED-CLS safety controller is powered down.

2. 2

   Access the Sensor

   Remove the steering column covers. The SASA sensor is flanged directly between the steering column and the OSPED hydraulic steering unit.

3. 3

   Remove the Steering Column

   Dismantle the steering column from the steering unit to expose the sensor.

4. 4

   Replace the Sensor

   Unplug the CAN wiring harness from the faulty SASA sensor. Remove the old sensor and install the new SASA sensor over the steering wheel shaft rotor.

5. 5

   Reassembly

   Bolt the steering column back onto the OSPED steering unit and reconnect the sensor's wiring harness.

6. 6

   Calibration

   Power up the tractor. You must perform an AST steering calibration. Enter the diagnostic mode by navigating the H menus on the instrument cluster (Navigate to the R1 module, menu H3, and select the AST system) to calibrate the steering angle sensor.