External Sensors; Barometric Pressure Sensor; Air Temperature Sensor - Evinrude E-TEC E40DRLSCB Service Manual

Barometric Pressure Sensor

Supplies the EMM with barometric pressure read-
ing to compensate for changes in altitude and air
density.
If the BP sensor reads below 13.3 KPa or above
119.0 KPa, or the sensor or circuit fails, the EMM:
Stores service code 44
If the BP sensor reads below 70 KPa, the EMM:
Stores a service code 45
If the BP sensor reads above 105 KPa, the EMM:
Stores service code 46
ENGINE MANAGEMENT MODULE (EMM)

EXTERNAL SENSORS

Sensor inputs and internal EMM controllers are
used to control outboard operation. Use Evinrude
Diagnostics software to troubleshoot the sensors.
Refer to the EMM Service Code Chart at the
back of this manual for a complete list of all
engine fault codes.
The EMM provides a 5 V DC signal for sensor cir-
cuits. It monitors all sensor voltage inputs and
compares them to predetermined acceptable
ranges. Inputs that fall outside of the acceptable
range create service codes.

Air Temperature Sensor

Monitors the air temperature at the throttle body.
The air temperature sensor is a negative tempera-
ture coefficient (NTC) thermistor. As temperature
increases, the resistance of the sensor decreases
resulting in a lower voltage reading at the EMM.
Temperature decreases result in a resistance
increase and a higher voltage reading at the
EMM.
If the AT sensor voltage is out of the expected
range, or the sensor or circuit fails, the EMM:
Stores service code 47
EMM LED 3: OFF (Cranking)
EMM LED 3: ON (Running)
Engine Monitor CHECK ENGINE display: ON
EXTERNAL SENSORS
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