12
9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
12.19
IGNITION COIL
OPERATION OVERVIEW
The ignition coil
q
is used to provide high voltage to fire
the spark plug. When the ignition key is on, DC voltage is
present in primary side of the ignition coil windings.
During engine rotation, an AC pulse is created within the
crankshaft position sensor for each passing tooth on the
flywheel. The two-tooth gap creates an “interrupt” input
signal, corresponding to specific crankshaft position. This
signal serves as a reference for the control of ignition
timing. The ECU then calculates the time interval
between the consecutive pulses, and determines when
to trigger the voltage spike that induces the voltage from
the primary to the secondary coil windings to fire the
spark plug.
IGNITION COIL TESTS
The ignition coil can be tested by using an Ohm meter.
Use the following specification table and illustrations to
test the ignition coil.
IGNITION COIL RESISTANCE READINGS
TEST PIN CONNECTION RESISTANCE
Primary
Between Battery (+) &
Coil (-)
0.5 Ω ± 10%
Primary
Test
Between Coil (-) and
(+) at the Coil
Connection
0.5 Ω
Secondary
Test
Between High Tension
Lead Caps
7.0 k Ω ± 5%
PRIMARY TEST
SECONDARY TESTS
ELECTRICAL
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