John Deere SBU523795.13 – SSU: Control Unit Calibration Problem

The Steering System Control Unit (SSU) has detected a calibration problem within the AutoTrac™ assisted steering system. This typically indicates that the calibration of the electro-hydraulic steering valve is incomplete, inconsistent, or has failed. This issue requires immediate attention to ensure proper operation of the machinery's automated steering capabilities.

• 7810
• 8130
• 8230
• 8330
• 8430
• 8530
• 9230
• 9330
• 9430
• 9530
• 9630
• 6020
• 6120
• 6220
• 6320
• 6420
• 6420S
• Sprayers
• Combines

1. 1

   Review other active fault codes (address codes related to voltage, GPS/transmission messages, or steering/wheel angle sensors first, as these prevent successful calibration)

2. 2

   Restart the vehicle to clear any temporary communication faults or glitches

3. 3

   Verify hydraulic oil is at normal operating temperature, as cold oil can trigger calibration faults

4. 4

   Inspect wiring harnesses connected to the SSU and steering valve for damage, corrosion, or loose connections

5. 5

   Check for incorrect or reversed AutoTrac steering valve workport connections

1. 1

   Prepare the machine

   Park on a level, dry surface with the engine running. Drive the machine until hydraulic oil reaches normal operating temperature (60-80°C or 140-190°F). Purge air from hydraulic lines by turning the steering wheel fully from lock to lock multiple times.

2. 2

   Access calibration menu

   Navigate through the machine's display to the diagnostics or calibration menu, typically found under 'Vehicle Calibration' or 'AutoTrac Controller'.

3. 3

   Initiate calibration

   Select the 'AutoTrac™ Calibration' or 'Steering Valve Calibration' option.

4. 4

   Perform calibration sequence

   Follow on-screen instructions: turn steering wheel fully to the left stop and store the value, turn fully to the right stop and store the value, then press and hold the AutoTrac™ resume switch to allow the system to automatically cycle the steering and find the valve's deadband.

5. 5

   Save calibration

   Once the automated process is complete, prompt the system to save the new calibration values.

6. 6

   Retry or replace components

   If calibration fails, verify all prerequisites and retry. If it repeatedly fails, the steering valve or SSU controller is likely faulty and requires replacement.