The suspension control unit is contained within the SCC control unit.
Left/Right axle position sensor: Input voltage of left/right axle position sensor will be monitored for under-voltage and over-voltage when front axle suspension is enabled and there are no active sensor supply faults. An under-voltage will be reported when input voltage is below 0.5 V and an over-voltage will be reported when input voltage is above 4.50 V. The undervoltage fault will remain active until input voltage returns to a level above 0.5 V. The over-voltage fault will remain active until input voltage returns to a level below 4.50 V. Front axle suspension will continue to operate while under-voltage or over-voltage fault of left/right axle position sensor is active.
John Deere SFA fault codes / John Deere SFA diagnostic trouble codes
NOTE:This page only indicates the meaning of the fault codes. For complete troubleshooting information, see the technical manuals.
SFA 000158.04 (SFA 158.04)— SFA Switched Supply Voltage Low
Code Caused By: Suspended Front Axle control unit (SFA) switched supply voltage is below 9.0 Volts.
SFA 000168.04 (SFA 168.04)— SFA Unswitched Supply Voltage Low
Code Caused By: Suspended Front Axle control unit (SFA) unswitched supply voltage below 9.0 V.
SFA 000629.12 (SFA 629.12)— SFA Control Unit Fault
Code Caused By: Suspended Front Axle control unit (SFA) software failed to execute in allotted time.
SFA 000630.02 (SFA 630.02)— Suspension Calibration Fault/Data Invalid
Code Caused By: Suspended Front Axle control unit (SFA) calibration data invalid or not complete.
SFA 000630.13 (SFA 630.13)— Suspension Not Calibrated
Code Caused By: Suspended Front Axle control unit (SFA) not calibrated.
SFA 001079.03 (SFA 1079.03)— Suspension Sensor Supply Voltage High
Code Caused By: Suspended Front Axle control unit (SFA) sensor supply voltage for position sensors above 5.25 V.
SFA 001079.04 (SFA 1079.04)— Suspension Sensor Supply Voltage Low
Code Caused By: Suspended Front Axle control unit (SFA) sensor supply voltage for position sensors below 4.65 V.
SFA 002003.09 (SFA 2003.09)— PTI or PTP Message Missing
Code Caused By: Suspended Front Axle control unit (SFA) not receiving required messages from the AutoPowr™/IVT™ (PTI) or PowerShift (PTP) control unit.
SFA 002005.05 (SFA 2005.05)— ACU Message Missing
Code Caused By: Suspended Front Axle control unit (SFA) not receiving required messages from the Armrest Control Unit (ACU).
SFA 002049.09 (SFA 2049.09)— CAB Message Missing
Code Caused By: Suspended Front Axle control unit (SFA) not receiving required messages from the Cab Control Unit (CAB).
SFA 002071.09 (SFA 2071.09)— CCU Message Missing
Code Caused By: Suspended Front Axle control unit (SFA) not receiving required messages from the Chassis Control Unit (CCU).
SFA 002602.18 (SFA 2602.18)— Hydraulic Oil Level Low
Code Caused By: Message from Chassis Control Unit (CCU) is indicating Clean Oil Reservoir is low.
SFA 522287.05 — Front Axle Unlocking Solenoid Circuit Current Low
Code Caused By: Front Axle unlocking solenoid circuit is open across the drive circuit or has a short to ground on either high or low side.
SFA 522287.06 — Front Axle Unlocking Solenoid Circuit Current High
Code Caused By: Front Axle unlocking solenoid circuit has a short to battery voltage on either high side or low side.
SFA 522288.05 — Front Axle Locking Solenoid Circuit Current Low
Code Caused By: Front axle locking solenoid circuit is open across the drive circuit or has a short to ground on either high or low side.
SFA 522288.06 — Front Axle Locking Solenoid Circuit Current High
Code Caused By: Front axle locking solenoid circuit has a short to battery voltage on either high side or low side.
SFA 522290.02 — Front Axle Right Position Sensor Calibration Fault
Code Caused By: Front Axle right position sensor calibration range is below 1.5 V.
SFA 522290.03 — Front Axle Right Position Sensor Circuit Voltage High
Code Caused By: Right front axle position sensor voltage is greater than 4.5 V.
SFA 522290.04 — Front Axle Right Position Sensor Circuit Voltage Low
Code Caused By: Right front axle position sensor voltage is less than 0.5 V.
SFA 523368.02 — SFA Control Unit Fault
Code Caused By: SFA Control Unit memory has become corrupted.
SFA 523652.02 — Wire Connector Fault/ Incompatible Harness Location
Code Caused By: Control unit is connected to wrong harness.
SFA 523902.07 — Suspension Not Responding To Raise Command
Code Caused By: Position sensor detects no upward movement for longer than 10 seconds.
SFA 523903.07 — Front Axle Not Responding To Lower Command
Code Caused By: Position sensor detects no downward movement for longer than 10 seconds.
SFA 523910.02 — SFA Control Unit Fault
Code Caused By: Suspended Front Axle control unit (SFA) memory is corrupted.
SFA 523948.05 — Suspension Raise Circuit Current Low
Code Caused By: Raise valve circuit is open across the drive circuit or has a short to ground on either high or low side.
SFA 523948.06 — Suspension Raise Circuit Current High
Code Caused By: Raise valve circuit has a short to battery voltage on either high side or low side.
SFA 523949.05 — Suspension Lower Control Circuit Current Low
Code Caused By: Raise/Lower valve circuit is open across the drive circuit or has a short to ground on either high or low side.
SFA 523949.06 — Suspension Lower Control Circuit Current High
Code Caused By: Raise/Lower valve circuit has a short to battery voltage on either high side or low side.
SFA 523950.02 — Front Axle Left Position Sensor Calibration Fault
Code Caused By: Front Axle left position sensor calibration range is below 1.5 V.
SFA 523950.03 — Front Axle Left Position Sensor Circuit Voltage High
Code Caused By: Left position sensor voltage is greater than 4.5 V.
SFA 523950.04 — Front Axle Left Position Sensor Circuit Voltage Low
Code Caused By: Left position sensor voltage is less than 0.5 V.
SFA 523950.13 — Front Axle Left Position Sensor Calibration Fault
Code Caused By: Front Axle left position sensor calibration failed.