Mercury Mariner Outboard 225 3 Litre Service Manual 1994, Page 120Get this manual
ENGINE TEMPERATURE SENSOR Insert digital or analog ohmmeter test leads into both TANsensor leadsWith engine at temperature (FOor CO indi catedohm readings should be as indicated 10BLOCK TEMPERATURE C' RESISTANCE(OHMS)
CRAN POSITION SENSOR
Contains permanent magnet and is positioned .040
.020 (1 .02mm .51 mm) from the flywheel teethNOTE: If boat tachometer is reading properly, then Crank Position Sensor is functioning normallyAn ohm check between the two sensor leads should indio cate 1100 ohms 200
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