Evinrude E-TEC E40DPLSCB, Service Manual

Page: 91 / 369

89
ENGINE MANAGEMENT MODULE (EMM)
EXTERNAL SENSORS
5
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:
If the BP sensor reads below 70 KPa, the
EMM:
If the BP sensor reads above 105 KPa, the
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 44
Stores a service code 45
Stores service code 46
Stores service code 47
EMM
LED 3: OFF (Cranking)
EMM
LED 3: ON (Running)
Engine Monitor CHECK ENGINE display: ON