BRP E250DHLSCS, Service Manual

Page: 117 / 396

115
SYSTEM ANALYSIS
IGNITION OUTPUT TESTS
6
IGNITION OUTPUT
TESTS
Check the
Evinrude
Diagnostics Software pro-
gram
Stored Faults
screen for current service
codes before troubleshooting. Correct any prob-
lems 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).
Battery
•
Battery switched B+ input to power up
EMM
•
Battery B+ input to Start Assist Circuit (SAC) of
EMM
Stator Output Voltage
•
Provides
EMM
J2 connector with A/C voltage:
Outboard cranking, typical range is 20-40 VAC
(AC output voltage is related to cranking RPM
)
;
outboard running approximately 55 VAC.
EMM
•
Controls digital grounds, battery 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 300 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 capacitor must be
grounded.
Ignition Primary Voltage
•
Output from
EMM
•
EMM
provides 200 VDC ± 10 V output to
orange ignition primary wires.
Ignition Coil
•
EMM
provides input to primary winding of coil
•
Output from ignition coil secondary winding and
high tension spark plug wire.
Wiring Inspection
Visually inspect all wiring, connections, and
grounds.
Use an ohmmeter to test resistance on all ground
circuits and connections. Ohmmeter readings
should be approximately 0.0
Ω .
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.
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
004128
1