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ENGINE MANAGEMENT MODULE (EMM)
INTERNAL EMM FUNCTIONS
INTERNAL EMM
FUNCTIONS
Start Assist Circuit (SAC)
When the ignition key is ON, the EMM Start Assist
Circuit (SAC) boosts battery voltage (12 V) to
30 V on the system (55 V) circuit.
ROM Verification
The EMM performs 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 correct the problem.
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 the best exhaust tun-
ing for 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.
Engine Monitor and Warning
Systems
Refer to ENGINE MONITORING SYSTEM on
p. 101.
Refer to S.A.F.E. WARNING SYSTEM on p. 102.
Refer to SHUTDOWN MODE on p. 102.
Fault Code Creation and Storage
Refer to the EMM Service Code Chart at the
back of this manual for a complete list of all
engine fault codes.
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