John Deere 523974.14 – SFA / TSC: Commanded Standard Pressure Could Not Be Achieved

This diagnostic trouble code is triggered when the control module detects that during the TLS (Triple Link Suspension / front-wheel drive axle suspension) oil pressure sensor check, the commanded standard pressure of 90 bar (9000 kPa; 1305 psi) is not achieved.

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

1. 1

   Verify the signal output voltage of the TLS oil pressure sensor (B167) to ensure it is within the expected range (0.25V to 4.75V).

2. 2

   Examine the wiring harness and connectors for the B167 oil pressure sensor for any signs of physical damage, loose connections, or corrosion.

3. 3

   Ensure the hydraulic system is functioning correctly and is physically capable of providing the commanded 90 bar (1305 psi) of pressure.

4. 4

   Inspect the TLS pressure build-up and reduction solenoid valves for faults or sticking.

1. 1

   Repair Wiring

   If the diagnostic checks reveal damaged wiring or corroded pins at the B167 sensor connector, repair or replace the faulty circuit components.

2. 2

   Replace the Sensor

   If the circuit is intact and hydraulic pressure is verified mechanically but the sensor reading is inaccurate, replace the B167 TLS oil pressure sensor.

3. 3

   Address Hydraulic/Valve Issues

   If the system physically cannot build 90 bar of pressure, repair the underlying hydraulic issue (e.g., replace faulty TLS solenoid valves or address pump/line restrictions).

4. 4

   Recalibrate

   After replacing the sensor or repairing the hydraulic system, recalibrate the TLS system following OEM procedures to ensure proper operation.