90
ENGINE MANAGEMENT MODULE (EMM)
SENSORS AND FUNCTIONS
Neutral Switch
The powerhead mounted neutral switch provides
a ground signal for the
EMM
to indicate shift link-
age position. This allows the
EMM
to control idle
speed variations for NEUTRAL or IN GEAR. Addi-
tionally, tiller models use the switch for start in
gear protection. Fuel and ignition functions are
turned off on tiller models if the neutral switch is
not activated.
If the switch is not functioning properly, the
EMM
:
The engine
Monitor
screen of the diagnostic pro-
gram displays switch position, NEUTRAL or IN
GEAR. Make sure switch is operating properly.
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.
Neutral RPM Limiter
This feature of
EMM
programming prevents
engine damage due to excessive RPM if acceler-
ated in NEUTRAL. Neutral engine speed is limited
to 1800 RPM.
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 service code is cleared. Refer to
SHUTDOWN
MODE
on p. 92.
Fault Codes
Refer to
Evinrude EMM Service Code Chart
at
back of manual for complete list of all engine fault
codes.
Stores a service code 19 (tiller models only)
Initiates
EMM
SENSOR FAULT LED
(Starting Mode only)
Activates SHUTDOWN
Stores a service code 57
Flashes
EMM
SENSOR FAULT LED
Flashes
SystemCheck
CHECK ENGINE light
Summary of Contents for E-tec 75 HP
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Page 233: ...233 POWERHEAD POWERHEAD VIEWS 10 POWERHEAD VIEWS Port Short Block Starboard Short Block ...
Page 234: ...234 POWERHEAD POWERHEAD VIEWS Port Dressed Powerhead Starboard Dressed Powerhead ...
Page 235: ...235 POWERHEAD POWERHEAD VIEWS 10 Front ...
Page 236: ...236 POWERHEAD POWERHEAD VIEWS Rear ...
Page 237: ...237 POWERHEAD POWERHEAD VIEWS 10 Top ...
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