Service Manual 5009005_40-60 AA-AF - 75-90 AA-AE Engine Managment Module [External Sensors]

Monitors the EMM’s 5 V sensor circuit.

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

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:

Stores service code 44

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

Stores a service code 45

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

Stores service code 46

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:

If cylinder head temperature exceeds 212° F (100° C) above 3500 RPM, or 230° F (110° C) below 3500 RPM, the EMM:

40 - 65 HP MODELS
If cylinder head temperature exceeds 212° F (100° C), the EMM:

If cylinder head temperature exceeds 248°F (120°C), the EMM:

ALL MODELS
The outboard will not restart after a temperature related SHUTDOWN until the engine temperature returns to normal. Refer to SHUTDOWN MODE on p. 66.

If sensor values are less than -15°F (-26.1°C) or greater than 332°F (166.5°C), the EMM:

If sensor values are below -4°F (-20°C), the EMM:

If cylinder head does not reach operating temperature (104°F / 40°C below 2300 RPM) in 10 minutes, the EMM:

Low Oil Switch
The low oil switch monitors the oil level in the oil tank.

If the oil level falls below one-quarter capacity, the EMM signals:

Engine Monitor LOW OIL display: ON

When the oil level falls below one-quarter, the EMM begins counting oil pump pulse cycles. When it reaches:
• 40 – 65 HP: 4800 pulses
• 75 – 90 HP: 6000 pulses

the EMM:

To recover from S.A.F.E. mode, the oil pump must cycle for a minimum of three pulses with the oil level above one-quarter

If outboard has been run for more than 3 hours with NO OIL faults (codes 34 & 117), the EMM.

Throttle Position Sensor
The throttle position sensor receives a voltage signal from the EMM. As the throttle lever is rotated, the EMM receives a return voltage signal through a second wire. This signal increases as the TPS lever is advanced. A third wire provides a ground circuit back to the EMM.

If TPS voltage is greater than 0.78 volts when the key is turned to ON, or the recoil starter is pulled, the EMM:

Creates service code 11

If the outboard starts, the code is saved.

If code 11 is present as both a Active Fault and a Occurred Fault, refer to Control Cable Installation on p. 23. For tiller models, refer to Throttle Cable Adjustment on p. 273, or Throttle Cable Adjustment on p. 284.

If the TPS or TPS circuit fails (below 0.14 volts or above 4.92 volts), the EMM:

IMPORTANT: When a TPS circuit fault has been detected, the outboard will not accelerate above idle speed. To reset, stop the outboard and correct the fault.

If the TPS circuit reads below 0.2 volts, the EMM.

If the TPS circuit reads above 4.85 volts, the EMM:

Crankshaft Position Sensor
Ribs spaced on the flywheel mark crankshaft position. As the ribs pass the magnetic field of the CPS, an AC voltage signal is generated. The EMM uses this signal to identify crankshaft position and speed, generate a tachometer signal, and control fuel and ignition timing.

If the sensor is damaged or the signal is intermittent (10 occurrences), the EMM:

Approximate air gap between CPS and flywheel encoder ribs is 0.073 inch (1.85 mm).

Use the Evinrude Diagnostics software Monitor screen to check CPS operation. The software should show an RPM reading while the outboard is cranking. If the CPS or its circuit fails, no RPM reading will appear and the outboard cannot run.

Neutral Switch
The powerhead mounted neutral switch controls a ground signal from the EMM to indicate shift linkage position. This allows the EMM to control idle speed variations and start in gear protection. Fuel and ignition functions are turned off if the neutral switch is not closed.

If the starter is cranked while the outboard is in gear, or if the switch fails, the EMM:

The Monitor screen of the diagnostics software displays switch position, NEUTRAL or IN GEAR. Make sure switch is operating properly.