2008 Evinrude E-TEC 55MFE Technical Manual, Page 113Get this manual
ELECTRICAL AND IGNITION SENSOR TESTS Connect red meter lead to terminal "A" and black meter lead to terminal "C Rotate the sensor lever through its range of travelResistance reading must change evenly as the sensor lever is movedConnect red meter lead on terminal "B" and black meter lead to terminal "C Rotate the sensor leverResistance reading must change evenly as the sensor lever is moved
Air Temperature Sensor (AT) Test
Remove the electrical connector from the air temperature sensorUse digital multimeter to measure sensor resistanceAT Sensor Resistance 9000 to 11,000 77F (25C)