Service Manual 40-90 HP.E-TEC Engine Managment Module [Internal 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.

Internal sensors are NOT serviceable. Reprogramming or replacement may be required to resolve internal EMM issues.

EMM Temperature Sensor

Monitors the temperature of the fuel injector driver circuits.

If the EMM temperature exceeds 176°F (80°C) or the circuit fails, the EMM:

If EMM temperature exceeds 212°F (100°C) or the circuit fails, the EMM:

IMPORTANT: The outboard will not restart until the engine cools below 212°F (100°C)and the EMM temperature returns to normal. Refer to SHUTDOWN MODE on p. 108.

If EMM temperature is less than -22°F (-30°C) or the circuit fails, the EMM:

If sensor reads less than -71°F (-57.4°C) or greater than 313°F (156°C), a sensor circuit fault is detected and the EMM: Stores service code 23 EMM LED 3: OFF (Cranking) EMM_ LED 3: ON (Running)

55 V Circuit Sensor

Monitors the _EMM_’s 55 V alternator circuit.

If system voltage exceeds 57 volts, the EMM:

If system voltage is less than 45 V, the EMM:

12 V Circuit Sensor

Monitors the EMM’s 12 V alternator circuit.

If battery voltage exceeds 15.5 volts, the EMM:

If battery voltage is less than 12.5 V, the EMM:

5 V Circuit Sensor

Monitors the EMM’s 5 V sensor circuit.

If sensor voltage is less than 4.75 volts, the EMM:

Barometric Pressure Sensor
Supplies the EMM with barometric pressure reading to compensate for changes in altitude and air density.

If the BP sensor reads less than 13.3 KPa or greater than 119.0 KPa, or the sensor or circuit fails, the EMM:

If the BP sensor reads less than 70 KPa, the EMM:

If the BP sensor reads greater than 105 KPa, the EMM:

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 circuits. 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

The air temperature sensor monitors the air temperature at the throttle body.

If the AT sensor voltage is out of the expected range, or the sensor or circuit fails, the EMM:

Engine Temperature Sensor

Monitors cylinder head temperature.

75 - 90 HP MODELS

If cylinder head temperature exceeds 212° F (100° C) below 3500 RPM, the EMM:

If cylinder head temperature exceeds 194° F (90° C) above 3500 RPM, the EMM: