Evinrude & Johnson E75DPLSCB, Service Manual

Page: 91 / 349

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