Igntion Coil; Operation Overview; Ignition Coil Tests; Ignition Coil And Ht Lead Replacement - Polaris Sportsman 850 Service Manual

FUEL SYSTEM

IGNTION COIL

OPERATION OVERVIEW

The ignition coil is used to provide high voltage to fire the
spark plugs. When the ignition key is on, DC voltage is
present in the 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 open the ground side of the primary coil circuit. This
triggers the voltage spike that induces the voltage from
the primary to the secondary coil windings to fire the
spark plugs.

IGNITION COIL TESTS

The ignition coil can be tested by using an ohm meter.
Use the following illustrations and specification table to
test the ignition coil.
Remove the seat and upper right-hand side panel to
access the ignition coil.
Ignition Coil Resistance Readings
TEST PIN CONNECTION RESISTANCE
Between 1 & 2
Primary
Between 2 & 3
Secondary Between High
Tension Lead Ends
Primary Test
4.36
0.4Ω
MAG: 975Ω ± 15%
PTO: 1188Ω ± 15%
Secondary Test
IGNITION COIL AND HT LEAD
REPLACEMENT
The plug caps or coil ends are not removable. The high
tension lead (coil wire) must be replaced as an
assembly.
1. Remove the seat and upper right-hand side panel to
access the ignition coil.
2. Disconnect the shift linkage and remove the high
tension lead caps from the spark plugs.
3. Remove the high tension leads from the airbox
retention.
4. Disconnect the wire harness from the ignition coil.
NOTE