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SYSTEM ANALYSIS
IGNITION OUTPUT TESTS
IGNITION OUTPUT
TESTS
Use the Evinrude Diagnostics software Occurred
Faults screen to check for current service code s
before troubleshooting. Correct any problems and
clear the codes FIRST.
Required Ignition Systems
Following is a comp lete list of circuits required for
ignition output:
Stop Circuit
• Black/yellow wire NOT grounded (eme rgency
stop switch lanyard in place).
Battery
•
Battery switched B+ input to power up EMM
• Battery B+ input to Start Assist Circuit (SAC) of
EMM
Stator Output Voltage
•
Provides A/C voltage to EMM J2 co nnector:
Outboard cranking, typical range is 20-40 VAC
(AC output voltage is related t o cranking RPM
);
Outboard running approximately 55 VAC.
EMM
•
Controls ignition grounds, injector grounds, and
ignition timing.
• Start Assist Circuit (SAC) converts battery volt-
age (12 V) to 30 V for system circuit (55 V).
Crankshaft Position Sensor
• Provides EMM with input.
• Outboard cranking speed exceeds 75 RPM and
a steady CPS signal is generated.
Alternator Output/System Voltage
• System voltage from EMM (white/red) provides
55 VDC to the oil injection pump, the fuel injec-
tors, and the ignition module of EMM.
Capacitor
•
Connected to 55 V circuit (white/red) to stabilize
current on 55 V circuit
• Negative terminal of cap acitor mu st be
grounded.
Ignition Coil
• Primary circuits are powered by system (55 V)
voltage
• EMM provides control signal to ignition coil
• Output from ignition coil secondary winding and
high tension spark plug wire.
Wiring Inspection
Visually in spect all wi ring, con nections, and
grounds.
Use a digit al ohmmete r to test resist ance on all
ground circuits and connections. Ohmmeter read-
ings should be approximately 0.0 Ω.
Check that all engine wire harness g rounds have
continuity to the cylinder/crankcase.
Clean or repair all ground circuits, wiring, and con-
nections as needed.
A DANGER
The electrica l syste m present s a serious
shock hazard. Allow outboard to sit for
two minutes after running before handling
capacitor or 55 V electrica l components.
Failure to handle ca pacitor properly can
result in uncontrolled electrical discharge
and possi ble ele ctrical sh ock to humans.
DO NOT handle primary or secondary igni-
tion components while outboard is run -
ning or flywheel is turning.
1. Main engine harness ground 004128
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