This screen holds two values: a maximum and a minimum battery voltage. When the measured voltage goes above the maximum or below the minimum, the Nexus activates the matching warning indicator. It doesn't change how the engine runs; it's an alert.
Why it's worth setting
- Low voltage usually points to a failing alternator, a slipping belt or a tired battery. Low voltage also slows injector and coil response, so it can affect how the engine runs.
- High voltage usually means a faulty regulator, which can damage the battery and electronics.
What to check
- Look at your logs to see what a healthy system reads at idle and at cruise, then set the limits with a sensible margin either side.
- Make sure the warning goes somewhere you'll notice, like a dash light or battery light output.
- If warnings appear, check grounds and the charging system before blaming the ECU.
Related: Diagnostics and Alternator Control. Need the screenshot? Ask us and we'll send it over with advice for your build.
