John Deere 523965.14 – SFA (Suspended Front Axle Control Unit): Front Axle Suspension Turned Off Due To A Fault. Check For Other Error Codes.
Issue description
This is a secondary, informational code indicating that the tractor's Triple Link Suspension (TLS) system has been disabled to protect the machine because a primary fault (such as a sensor failure, calibration error, or voltage issue) has been detected.
Applies to these machines
12 machines- 6110R
- 6120R
- 6130R
- 6145R
- 6155R
- 6175R
- 6195R
- 6215R
- 6110M
- 6120M
- 6130M
- 6145M
Check the cause
Check the diagnostic display for primary active fault codes (e.g., position sensor voltage <0.5V or >4.5V, or calibration faults), as this is a secondary code.
Visually inspect around the batteries and alternator for any signs of damage or accumulated debris.
Check fuse F30, which supplies voltage to the SFA system.
Inspect the front axle position sensors (TLS rockshaft sensors) and their wiring harnesses for physical damage, corrosion, or loose connections.
Inspect the physical control rod/linkage that connects the axle to the position sensor to ensure it is not bent, broken, or binding.
Repair steps
Address the Primary Fault
Repair the root cause identified by the primary error code. If the primary code indicates a sensor voltage issue (e.g., greater than 4.5V or less than 0.5V), the position sensor or its wiring harness is likely faulty and needs replacement.
Resolve Power Issues
If the primary code points to an SFA Switched Supply Voltage Low issue, replace fuse F30 if blown, clean the battery terminals, and clear any debris from the alternator.
Replace Faulty Sensors
If replacing the TLS position sensor, disconnect the battery first. Remove the old sensor and control rod, install the new sensor, and ensure proper physical alignment of the linkage.
Clean the Manifold
If solenoid circuit codes are also present, remove debris and clean the Independent Link Suspension manifold.
Recalibrate the Suspension
After replacing any suspension components or sensors, you must perform a suspension calibration procedure through the tractor's display monitor, as failure to calibrate will trigger further fault codes.
Clear Codes and Test
Clear all stored fault codes and test drive the tractor to ensure the front axle suspension operates smoothly and the code does not return.
Parts you might need
(9)TLS Front Axle Position Sensor (Rockshaft Position Sensor)
AL113868Fits John Deere 6R, 6M, 7R, 8R, and 9R series tractors. Weather-sealed electronic sensor.
TLS Front Axle Position Sensor (Rockshaft Position Sensor)
AL113843Fits John Deere 6R, 6M, 7R, 8R, and 9R series tractors. Weather-sealed electronic sensor.
TLS Front Axle Position Sensor (Rockshaft Position Sensor)
AL110351Fits John Deere 6R, 6M, 7R, 8R, and 9R series tractors. Weather-sealed electronic sensor.
TLS Front Axle Position Sensor (Rockshaft Position Sensor)
AL232274Fits John Deere 6R, 6M, 7R, 8R, and 9R series tractors. Weather-sealed electronic sensor.
TLS Front Axle Position Sensor (Rockshaft Position Sensor)
AL235420Fits John Deere 6R, 6M, 7R, 8R, and 9R series tractors. Weather-sealed electronic sensor.
TLS Front Axle Position Sensor (Rockshaft Position Sensor)
AL235459Fits John Deere 6R, 6M, 7R, 8R, and 9R series tractors. Weather-sealed electronic sensor.
Position Sensor Control Rod / Linkage
AL119734Connects the front axle to the TLS sensor. Fits 5E, 5R, 6M, 6R, 7R, and 8R series.
SFA / TLS Controller
AL175132Only replace if the control unit itself is diagnosed as internally faulty after checking all sensor inputs and hydraulic pressures.
Fuse F30
Standard automotive blade fuse (verify amperage in the operator's manual).
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