Description:

This error code is generated when the switched supply voltage to the Selective Control Valve Unit V (SV V) falls below 9.0 V. This typically occurs due to an undervoltage condition in the electrical system supplying the SV V.

Reaction:

When this error is detected, the equipment may experience malfunction or unexpected behavior in the operation of the Selective Control Valve Unit V. This could result in impaired hydraulic functions or erratic performance of systems dependent on this valve.

Recommendations:

Inspect and Correct Voltage Supply:

• Check Voltage Levels: Use a multimeter to measure the voltage supply to the SV V. Ensure it is within the specified range (typically above 9.0 V).
• Inspect Wiring and Connections: Look for any loose, corroded, or damaged wiring and connectors that may cause voltage drops. Repair or replace as necessary.
• Check for Faulty Components: Test components such as the alternator, voltage regulator, and batteries for proper function. Replace any faulty components.

Perform VLC Code Diagnostics:

• Associated Codes: Since this code and other 000158.XX codes may appear in other control units, start by diagnosing the Vehicle Load Center (VLC) control unit. The VLC’s wake-up circuit is the voltage source, and issues here can propagate to other systems.
• Diagnostic Tools: Utilize diagnostic tools specific to the John Deere system to read and clear any additional VLC-related codes.

Update Control Unit Software:

• Software Updates: Ensure that all control units, including the VLC and SV V, have the latest firmware updates installed to address potential software-related issues.

Monitor System After Repairs:

• Continuous Monitoring: After performing repairs and corrections, monitor the system to ensure the voltage levels remain stable and the error code does not reoccur.
• Record Observations: Keep detailed records of any changes or patterns observed during monitoring to assist in further diagnostics if needed.

Note:

This error code can be indicative of broader electrical system issues. Ensure that all related control units and circuits are thoroughly checked and maintained. Voltage irregularities can lead to more significant issues if not addressed promptly.