Service Manual 75-90 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.

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. 94.

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:

Monitors the EMM’s 55 V alternator circuit.

If system voltage exceeds 57 volts, the EMM:

If system voltage is below 45 volts with outboard running 500 to 1000 RPM or is below 52 volts with outboard running above 1000 RPM, the EMM:

Monitors the EMM’s 12 V alternator circuit.

If battery voltage exceeds 15.5 volts, the EMM:

If battery voltage is below 12 volts with outboard running 500 to 2000 RPM OR is below 12.5 volts with outboard running above 2000 RPM, the EMM:

Supplies the EMM with barometric pressure reading 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:

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

Monitors the air temperature at the throttle body. The air temperature sensor is a negative temperature 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: