Kohler — Speed Sensor Test with Separate 12 VDC Source
Testing & diagnosis
From a Kohler service manual covering: 125REOZJG, 150 REOZJ4, 150REZG, 175REOZT4, 2000REOZM, 2000REOZMD, 2250REOZDD, 275REOZJD, 275REOZJE, 400REZX, 400RZX, 48REOZK4…. Check it applies to your exact model before use.
Applies to: Kohler 125REOZJG, Kohler 150 REOZJ4, Kohler 150REZG, Kohler 175REOZT4, Kohler 2000REOZM, Kohler 2000REOZMD, Kohler 2250REOZDD, Kohler 275REOZJD, Kohler 275REOZJE, Kohler 400REZX, Kohler 400RZX, Kohler 48REOZK4
Procedure
- Place master switch in OFF/RESET position.
- Disconnect the speed sensor leads.
- Connect speed sensor, DC voltmeter, and DC voltage source as shown.
- Touch sensing surface with a flat piece of iron or steel at least 4.1 cm (1/4 cu. in.) in size.
- DC voltmeter reading should equal the source voltage, approximately 12 VDC.
- Remove the iron or steel piece and observe a voltmeter reading of 0 VDC.
- If the sensor passes, it is functional; replace if it fails.
- Connect the speed sensor leads and adjust the air gap.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Speed sensor air gap 0.36- 0.71 mm (0.014- 0.028 in.)
Full service-parts list: Kohler 125REOZJG →, Kohler 150 REOZJ4 →, Kohler 175REOZT4 →, Kohler 2000REOZM →, Kohler 2000REOZMD →, Kohler 2250REOZDD →, Kohler 275REOZJD →, Kohler 275REOZJE →, Kohler 48REOZK4 →
Source: Kohler 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.