Evinrude E-tec 75 HP, Service Manual

Page: 86 / 344

86
ENGINE MANAGEMENT MODULE (EMM)
DESCRIPTION
DESCRIPTION
The Engine Management Module (
EMM)
is a
water-cooled microprocessor. It controls numer-
ous outboard systems including alternator output
for the 12 V and 55 V circuits. The stator provides
the
EMM
with voltage inputs that are essential to
alternator output.
This section discusses the functions of the
EMM
and the various internal and external sensors. The
process for retrieving service codes stored in the
EMM
during engine operation is also presented.
The
EMM
Service Code Chart located at the back
of this manual can be used to reference service
code information.
EMM
Functions
The EMM
controls the following processes and
functions:
•
Fuel and ignition timing and duration
•
Ignition system primary voltage output
•
Fuel injector activation
•
Oil injector pump activation
•
Electric fuel pump control
•
Alternator output; 55 V and 12 V
•
Idle speed control
•
RPM limiter
•
Electrical circuit monitoring
•
Service codes and warning system activation
•
ROM verification, self-test
•
Choke-less cold starting
•
Output of “real-time” diagnostic data
•
Tachometer signal
•
RPM profile and engine hours
•
Oiling ratios
EMM
Connections
IMPORTANT:
EMM
connections and wiring
must be clean and tight. Improper electrical con-
nections can damage the
EMM
. DO NOT attempt
to run the outboard with loose or disconnected
wiring.
Make sure
EMM
connections are clean and tight.
•
Engine wire harness to
EMM
connectors; J1-A,
J1-B, J2
•
Stator to
EMM
connections; one 6-pin
AMP
and
J2 connector.
1. J1-A connector
2. J1-B connector
3. J2 connector
002424
1
2
3