Ect Sensor Replacement; Ignition Coil; Ignition Coil Tests - Polaris 2009 Sportsman XP 850 Service Manual

ECT Sensor Replacement

1. Drain coolant to level below sensor.
2. Disconnect the ECT sensor from engine harness. Remove
the T-MAP sensor to allow access to the ECT sensor.
ECT
3. Remove and replace the sensor, applying a light coating of
thread sealant to aid installation.
4. Torque the ECT sensor to specification.
ECT Sensor Torque:
17 ft. lbs. (23 Nm)
= T
ELECTRONIC FUEL INJECTION

IGNITION 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
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 plugs.
Ignition Coil

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
Connection
Between 1 & 2
Primary
Between 3 & 2
Between
Secondary High Tension
Lead Ends
RH Side
of Airbox
Pin
Resistance
0.4 Ω
5 k Ω
3.23
3