101
ENGINE MANAGEMENT MODULE (EMM)
SENSORS AND FUNCTIONS
4
Internal Functions
ROM Verification
The EMM runs through a self-test of programming
every time it is turned ON. Service code 15 indi-
cates a programming (software) issue. Repro-
gram the EMM with the correct software program
to resolve.
Idle Controller
The idle controller reacts to engine operating con-
ditions. Fuel and ignition timings are altered to
maintain a specific RPM when engine is cold or
warm. The controller is inactive when TPS is
advanced from idle position.
RPM Limiter
This feature of EMM programming prevents
engine damage due to excessive RPM. At 6250
RPM, fuel and ignition to the cylinders is shut off.
Normal engine operation resumes when engine
RPM returns to the specified range.
Exhaust Valve (V4 Models)
The EMM controls a valve that switches between
two exhaust paths to provide optimum exhaust
tuning under various running conditions. At slower
speeds and under acceleration, the system opens
a longer path, allowing the engine to develop
more midrange horsepower as the boat comes on
plane. At higher RPMs, the path is shortened for
maximum high speed performance.
Shutdown, Code 57
This feature of EMM programming monitors
engine operation for abnormally high RPM with a
low TPS position. If this condition is detected, the
EMM:
IMPORTANT: The outboard will not restart until
the stored service code is cleared; and the EMM
is turned OFF and then ON again. Refer to
SHUTDOWN MODE on p. 103.
Fault Codes
Refer to Evinrude EMM Service Code Chart at
back of manual for complete list of all engine fault
codes.
Activates SHUTDOWN
Stores a service code 57
Flashes EMM SENSOR FAULT (LED 3)
Flashes SystemCheck CHECK ENGINE light
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