Description:

This error code indicates that the switched supply voltage to the Selective Control Valve Unit IV (SV IV) has dropped below 9.0 volts. Such a low voltage condition can be caused by a weak battery, poor electrical connections, or issues within the Vehicle Load Center (VLC).

Reaction:

When this low voltage condition is detected, the SV IV may not function correctly, leading to potential issues with valve operations. A diagnostic warning will be displayed on the control panel.

Recommendations:

• Inspect Battery:
  • Ensure the battery is fully charged and in good condition. Replace if necessary.
• Check Wiring:
  • Examine the wiring associated with the SV IV for any signs of damage, loose connections, or corrosion. Repair or replace any compromised wiring.
• Perform VLC Diagnostics:
  • Since the VLC control unit wake-up circuit is the voltage source, start diagnostics with the VLC. Check for related codes and address any issues found.
  • Follow the VLC diagnostic procedures to ensure it is operating within normal voltage ranges.
• Inspect Power Supply:
  • Verify that the power supply to the SV IV is stable and within the specified voltage range.

Note:

• Associated Codes:
  • This code and other 000158.XX codes may be present in other control units. Address all associated codes systematically, starting with the VLC control unit diagnostics.
• Preventive Measures:
  • Regular monitoring and maintenance of the electrical systems can prevent voltage-related issues. Ensure all connections and components are in good condition to avoid low voltage situations.