Water Separator (Sedimentary)

Remove the water detector switch from the top of the water separator. Disconnect detector switch wires from harness. Connect an ohmmeter to water detector switch. The detector is operating properly when continuity exists with switch upright and no continuity exists with switch upside down. See Fig 1.

Fig 1: Water Detector Switch Test

Courtesy of MAZDA MOTORS CORP.

Continuity should only exist when switch is upright.