John Deere 523951.13 – TSC: SFA Not Calibrated Or Out Of Calibrated Range

This diagnostic trouble code indicates that the Suspended Front-Wheel Drive Axle (SFA), also known as the TLS (Triple-Link Suspension) front-wheel drive axle, has an invalid calibration or failed during the calibration process.

• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 6090MC
• 6100MC
• 6110MC
• 6090RC
• 6100RC
• 6110RC
• 6230
• 6330
• 6430

1. 1

   Verify operating conditions: Ensure the tractor is completely stationary and engine speed is above 500 rpm before attempting calibration

2. 2

   Check the output voltage of the TLS Position Sensor (B53) (must read between 2 and 3 volts when in the mid/level position)

3. 3

   Check the signal output of the TLS Oil Pressure Sensor (B167) to ensure it is within the expected range and not dropping during pressure buildup

4. 4

   Inspect the wiring harnesses and connectors for sensors B53 and B167 for damage, corrosion, or loose connections

5. 5

   Inspect the hydraulic circuit for blockages, leaks, or pressure issues preventing the axle from reaching standard pressure within 90 seconds

6. 6

   Test the operation and circuits of the raising/lowering and pressure buildup/reduction solenoid valves

1. 1

   Resolve Pre-conditions

   Clear any active CAN BUS faults related to wheel speed or engine speed, and ensure the tractor is not excessively ballasted.

2. 2

   Repair Wiring

   If the diagnostic checks reveal a circuit issue, repair or replace the damaged wiring harness sections leading to the B53 or B167 sensors.

3. 3

   Replace Faulty Components

   If wiring is intact but sensor voltages are out of range (e.g., position sensor fails to hit 0.5-1.5V when rising or 3.5-4.5V when lowering), replace the faulty TLS Position Sensor (B53) or TLS Oil Pressure Sensor (B167). If the axle fails to move or build pressure, replace the faulty solenoid valve(s).

4. 4

   Recalibrate

   Once repairs are made, use the John Deere diagnostic tool to initiate the SFA/TLS calibration procedure. The system must successfully complete this automated routine to clear the 523951.13 code.