Volvo Penta Group 23 EDC III — Checking water monitor, fuel pre-filter
Testing & diagnosis
For the Volvo Penta Group 23 EDC III, from the Volvo Penta service manual.
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Procedure
- Disconnect the connector and remove the water monitor from the fuel pre-filter.
- Connect red cable to a 24V source; connect a 1W light bulb between the yellow cable and +24V; connect black cable to ground (-).
- Submerge the sensor's contact pins in water; the light bulb should light when water is between the pins.
- When the sensor is removed from water, the light bulb should go out.
Source: Volvo Penta service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.