Exhaust Valve (V4 Models); Exhaust Valve Static Test - Evinrude E-TEC E115DPLSCR Service Manual

EXHAUST VALVE
(V4 MODELS)
The inner exhaust housing on 60° V4 models is
designed with two exhaust tuning modes. An
EMM controlled valve opens and closes a cham-
ber in the inner exhaust to provide the best
exhaust tuning for various running conditions. A
relay module and actuator motor are used to
move the valve.
At slower speeds and under acceleration, the sys-
tem opens a longer path, allowing the engine to
develop more midrange horsepower. This helps
heavier boats get on plane quickly. At higher
RPMs, the path is shortened for maximum high
speed performance.
At key on, the EMM cycles the valve from Low
•
Speed Mode to High Speed Mode as a system
self-test.
The valve remains in High Speed Mode when
•
cranking, starting and idling.
When TPS% exceeds approximately 2% to 5%,
•
the EMM moves the valve to Low Speed Mode.
When speed exceeds approximately 5000 rpm,
•
the EMM moves the valve to High Speed Mode.
The EMM controls the timing of the valve based
on engine load. Engine load is calculated from
sensor inputs.
HIGH SPEED
Exhaust Valve Diagram
SLOW SPEED
005434

EXHAUST VALVE (V4 MODELS)

Operational Symptoms:
If the exhaust valve is stuck in low speed mode,
•
the outboard may lose top speed RPM.
If the exhaust valve is stuck in high speed
•
mode, the outboard may have poor accelera-
tion.

Exhaust Valve Static Test

Use the Evinrude Diagnostics software Static Test
to check operation of exhaust valve actuator. Lis-
ten for valve to open or close. If actuator does not
operate, refer to EXHAUST VALVE RELAY
TESTS.
Static Tests Screen
1. Exhaust valve test button
SYSTEM ANALYSIS
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