BRP EVINRUDE E-TEC BE50DPLABA, Service Manual

Page: 83 / 422

83
SYSTEM ANALYSIS
IGNITION OUTPUT TESTS
5
IGNITION OUTPUT
TESTS
Use the Evinrude Diagnostics software Occurred
Faults screen to check for current service codes
before troubleshooting. Correct any problems and
clear the codes FIRST.
Required Ignition Systems
Following is a complete list of circuits required for
ignition output:
Stop Circuit
•
Black/yellow wire NOT grounded (emergency
stop switch lanyard in place).
Neutral Switch
•
Powerhead mounted neutral switch provides a
switched ground circuit to
EMM . The circuit
enables specialized control functions such as
neutral start protection and RPM limiting in
NEUTRAL.
Stator Output Voltage
•
Provides A/C voltage to EMM J2 connector:
Outboard cranking, typical range is 20-40 VAC
(AC output voltage is related to cranking RPM
)
;
Outboard running, approximately 55 VAC.
EMM
•
Controls ignition grounds, injector grounds, and
engine timing.
Crankshaft Position Sensor
•
Provides EMM with input.
•
Outboard cranking speed exceeds 300 RPM
and a steady CPS signal is generated.
Alternator Output/System Voltage
•
System voltage from EMM (white/red) provides
55 VDC to the high pressure fuel pump, the oil
injection pump, the fuel injectors, and the igni-
tion coils.
Capacitor
•
Connected to 55 V circuit (white/red) to stabilize
current on 55 V circuit
•
Negative terminal of capacitor must 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 inspect all wiring, connections, and
grounds.
Use a digital ohmmeter to test resistance on all
ground circuits and connections. Ohmmeter read-
ings should be approximately 0.0 W.
Check that all engine wire harness grounds have
continuity to the cylinder/crankcase.
Clean or repair all ground circuits, wiring, and con-
nections as needed.
A
DANGER
The electrical system presents a serious
shock hazard. Allow outboard to sit for
two minutes after running before handling
capacitor or 55 V electrical components.
Failure to handle capacitor properly can
result in uncontrolled electrical discharge
and possible electrical shock 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 002292
1