1999 "EE" 90, 115 FFI, 150, 175 V4, V6 FFI Outboards Service Manual, P/N 787024, Page 59Get this manual

1999 "EE" 90, 115 FFI, 150, 175 V4, V6 FFI Outboards Service Manual, P/N 787024, Page 59

External ECU Sensors

Air Temperature SensorThe air temperature sensor monitors the temperature of air entering the air silencerThe AT sensor is Positive Temperature Coefficient (PTC) thermistor, resistor whose resistance changes with temperature and alters voltage values accordinglyWhen temperature increases, both resistance and voltage also increaseWhen temperature decreases, resistance and voltage likewise decrease

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