FCC 000158.18 – Instrument Unit, Supply Voltage (ELX) Too Low

FCC 000158.18 (FCC 158.18)

Code: 000158.18

Shortcode: 158.18

Description:

This error code indicates that the supply voltage to the Instrument Unit (ELX) has fallen below 11.2 volts while the engine speed is between 500 and 1500 RPM. This issue typically arises due to problems with the battery, alternator, or electrical connections within the system.

Reaction:

The control software will have limited or no functionality due to the undervoltage condition, impacting the performance and operation of the instrument unit.

Recommendations:

  • Check Battery Health: Ensure the battery is not weak or discharged and is capable of holding a charge.
  • Inspect Charging System: Verify that the alternator and charging system are functioning correctly, even at moderate engine speeds.
  • Examine Wiring and Connections: Look for any loose, corroded, or damaged wires and connections that could be causing a voltage drop.
  • Test Voltage Under Load: Use diagnostic tools to test the voltage levels under different engine loads to identify the source of the undervoltage.

Note:

Undervoltage conditions can lead to inaccurate data from the Instrument Unit, potentially causing operational issues. Regular inspections and maintenance of the electrical system are essential to prevent such faults.


Control Units: John Deere

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