John Deere 522273.00 – SSU: Steering Valve Control Circuit Command High

The Steering System Unit (SSU) has detected excessively high voltage in the electrical circuit connected to the electro-hydraulic steering valve, indicating a signal out of range high. This issue affects the proper operation of the AutoTrac steering mechanism and is typically caused by a fault within the wiring harness or the electro-hydraulic valve itself.

• 7630
• 7730
• 7830
• 7930
• 9230
• 9330
• 9430
• 9530
• 9630
• 6020
• 6120
• 6220
• 6320
• 6420
• 4930

1. 1

   Restart the vehicle to see if the communication message resets and clears the code

2. 2

   Inspect fuses related to the steering system, specifically checking fuse F23 for SSU voltage issues

3. 3

   Visually inspect the wiring harness and connectors leading to the electro-hydraulic steering valve and the SSU for damage, corrosion, or loose connections

4. 4

   Check the StarFire and GPS/Mobile Processor connectors, as communication issues here can trigger SSU codes

5. 5

   Verify if the AutoTrac steering valve calibration has been lost or improperly set

1. 1

   Confirm the fault

   After performing initial diagnostic checks and restarting the machine, verify that fault code 522273.00 remains active.

2. 2

   Test the circuit

   Check for an 'out of range high' voltage at the connector of the electro-hydraulic steering valve. Test for a voltage between 4 and 10 VDC between specific pins on the steering valve connector as per the service manual.

3. 3

   Isolate the faulty component

   If the voltage is incorrect but the wiring harness is confirmed to be in good condition, the fault is likely isolated to the electro-hydraulic portion of the steering valve.

4. 4

   Replace the faulty component

   Replace the faulty electro-hydraulic valve, which is often the electronic (PVE - Proportional Valve Electronic) part of the valve assembly.

5. 5

   Perform calibration

   After replacing the valve, perform a full AutoTrac steering valve calibration. Put the machine on a level surface, warm the hydraulic oil, and follow on-screen prompts to allow the system to find the valve's deadband automatically.