BRP Evinrude E-TEC Series, Руководство по обслуживанию, Страница: 79 / 342

77
SYSTEM ANALYSIS
IGNITION OUTPUT TESTS
5
Ignition Control Circuit Tests
Use a digital multimeter to test the following:
•
System voltage supply to ignition coil.
•
Ignition control signal from EMM .
•
Engine harness resistance.
Disconnect ignition coil connector.
Supply voltage test:
Use an appropriate adapter to connect the red
meter lead to pin 3 (white/red) of the engine har-
ness connector and the black lead to ground. With
EMM ON, voltage should be approximately 1 V
less than battery voltage.
Control signal test:
Set meter to the Hz scale to check ignition control
signal.
Use an appropriate adapter to connect the red
meter lead to pin 2 (orange) of the engine harness
connector and the black lead to ground. Activate
diagnostics software
Static Ignition test and
observe meter for consistent reading (approxi-
mately 2 Hz).
If control signal is present, connect black meter
lead to pin 1 and repeat test to confirm harness
ground.
Harness resistance test:
If control signal is NOT present, calibrate multime-
ter to low ohms scale. Use appropriate adapters
on meter leads to avoid damaging harness con-
nectors.
With EMM OFF, remove the EMM J1-A connector
and test the continuity of each ignition control cir-
cuit (orange). Check resistance between J1-A
connector and ignition coil connector. Refer to
engine wiring diagram.
If circuits test good, replace EMM .
Ignition Coil Tests
There are no simple ignition coil tests available.
Before replacing an ignition coil, be sure:
•
55 V is supplied to the white/red wire of the igni-
tion coil connector
•
A control signal is present on the orange wire of
the ignition coil connector. Refer to
Ignition
Control Circuit Tests on p. 77.
•
The black wire of the ignition coil connector pro-
vides continuity to ground.
•
The secondary spark plug lead provides conti-
nuity.
If all of the above tests are good, and a cylinder
does not have spark, replace the ignition coil with
a known good coil.
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