Evinrude E-Tec 40 HP, Service Manual, Page: 61 / 426

59
ENGINE MANAGEMENT MODULE (EMM)
EXTERNAL SENSORS
4
Throttle Position Sensor
The throttle position sensor receives a voltage sig-
nal from the
EMM
. As the throttle lever is rotated,
the
EMM
receives a retu rn voltage signal through
a second wire. This signal increases as the TPS
lever is advanced. A third wire provides a ground
circuit back to the
EMM
.
If TPS voltage is greater than 0.78 volts when the
key is turned to ON, or the recoil starter is pulled,
the
EMM
:
If the outboard starts, the code is saved.
If code 11 is present as both a Active Fault and a
Occurred Fa ult, re fer to
Control Cable Installa-
tion
on p. 19. For tiller models, re fer to
Throttle
Cable Adjustment
on p. 276, or
Throttle Cable
Adjustment
on p. 287.
If the TPS or TPS circuit fails (below 0.14 volts or
above 4.92 volts), the
EMM
:
IMPORTANT:
When a TPS circu it fault has
been detected, th e outboa rd will not accele rate
above idle speed. To reset, stop the outboard and
correct the fault.
If the TPS circuit reads below 0.2 volts, the
EMM
:
If the TPS circuit read s above 4.85 volt s, the
EMM
:
Crankshaft Position Sensor
Ribs spaced on the flywheel mark crankshaft posi-
tion. As the ribs p ass the ma gnetic field of th e
CPS, an AC volt age signal is generated. Th e
EMM
uses this signal to identify crankshaft posi-
tion and speed, generate a tachometer signal, and
control fuel and ignition timing.
If the sensor is damaged or the signal is intermit-
tent (10 occurrences), the
EMM
:
Approximate air g ap b etween CPS a nd flywhee l
encoder ribs is 0.073 inch (1.85 mm).
Use the
Evinrude Diagnostics
so ftware
Monitor
screen to check CPS opera tion. The software
should show an RPM re ading while the outboard
is cranking. If the CPS or its circuit fails, no RPM
reading will appear and the outboard cannot run.
Neutral Switch
The powerhead mounted neutral switch controls a
ground signal from the
EMM
to indicate shift link-
age position. This allo ws the
EMM
to control idle
speed variations and start in gear protection. Fuel
and ignition functions are turned off if the neutral
switch is not closed.
If the starter is cranked while t he o utboard is in
gear, or if the switch fails, the
EMM
:
The
Monitor
screen o f the dia gnostics sof tware
displays switch position, NEUTRAL or IN GEAR.
Make sure switch is operating properly.
Creates service code 11
Stores service code 12
Limits engine RPM to IDLE
EMM
LED 3: OFF (Cranking)
EMM
LED 3: ON (Running)
Engine Monitor CHECK ENGINE display: ON
Stores service code 13
EMM
LED 3: OFF (Cranking)
EMM
LED 3: ON (Running)
Engine Monitor CHECK ENGINE display: ON
Stores service code 14
EMM
LED 3: OFF (Cranking)
EMM
LED 3: ON (Running)
Engine Monitor CHECK ENGINE display: ON
Stores service code 16
EMM
LED 2: OFF (Cranking)
EMM
LED 3: ON (Running)
Stores service code 19
EMM
LED 3: OFF (Cranking)
Engine Monitor CHECK ENGINE display: ON