Evinrude E-tec 75 HP Service Manual page 89

Oil Pressure Switch
The oil pressure switch monitors oil pressure in
the oil distribution manifold. The switch requires
approximately 7 psi (48 kPa) (nominal) to close.
If the switch fails to indicate pressure in the oil dis-
tribution manifold, the EMM:
Activates S.A.F.E.
Stores a service code 38
Initiates EMM NO OIL / OVERHEAT LED
Initiates the SystemCheck NO OIL light
If the switch indicates constant pressure (no
changes) in oil distribution manifold, the EMM:
Stores a service code 32
Initiates EMM SENSOR FAULT LED
Throttle Position Sensor
The throttle position sensor is a rotary potentiome-
ter connected to the throttle plate shaft. The sen-
sor receives a voltage signal from the EMM. As
the throttle lever is rotated, the EMM receives a
return 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.
Refer to TPS Calibration on p. 143.
If the TPS sensor or circuit fails (below 0.15 volts
or above 4.95 volts), the EMM:
Stores a service code 12
Limits engine RPM to IDLE
Initiates EMM SENSOR FAULT LED
Initiates the SystemCheck
CHECK ENGINE light
IMPORTANT:
Once a TPS circuit fault has been
detected, the outboard will not accelerate above
idle speed. To reset, stop the outboard and correct
the fault.
If the TPS sensor circuit indicates below 0.2 volts,
the EMM:
Stores a service code 13
Initiates EMM SENSOR FAULT LED
ENGINE MANAGEMENT MODULE (EMM)
SENSORS AND FUNCTIONS
If the TPS sensor circuit indicates above 4.85
volts, the EMM:
Stores a service code 14
Initiates EMM SENSOR FAULT LED
If the TPS sensor circuit indicates above 0.65
volts when the key is turned to the ON position,
the EMM:
Initiates a service code 11
If the outboard is started, the code is stored.
If code 11 is present as both a Hard Fault and a
Stored Fault, refer to Control Cable Adjust-
ments on p. 54.
Crankshaft Position Sensor
The CPS is a magnetic device. It is mounted in
the throttle body, adjacent to the flywheel.
Encoder rib spacing on the flywheel coincides with
crankshaft position. As the encoder ribs of the fly-
wheel pass the magnetic field of the CPS, an AC
voltage signal is generated. The EMM uses this
signal to identify crankshaft position and speed,
generate a tachometer signal, and control fuel and
ignition timing.
If the sensor is damaged or the signal is intermit-
tent (10 instances), the EMM:
Stores a service code 16
Initiates EMM SENSOR FAULT LED
Approximate air gap between CPS and flywheel
encoder ribs is .073 (1.85 mm).
Use the engine Monitor screen of the Evinrude
Diagnostics Software program to check CPS
operation. The outboard should indicate an RPM
reading while cranking. If the CPS or its circuit
fails, no RPM reading will be generated and the
outboard cannot run.
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