10.21
ELECTRICAL
10
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
IGNITION SYSTEM
Overview
The Sportsman has incorporated into it's design a DC/ CDI ignition system. The DC/ ignition system relies on battery power for ignition.
EFI - Instead
of generating DC voltage via flywheel magnetic induction, a 12 Vdc current is supplied from the Ignition/Fuel Pump Relay to the Ignition
coil. At the ECU, a small A/C signal from the CPS helps the ECU pre-determine Top Dead Center (TDC), which in turn signals the ECU to release
the electrical charge collapsing the coil field for ignition (based on the ECU timing map).
CDI- A 12 volt DC curr
ent is supplied directly from the battery to the CDI. At the CDI, a DC current is supplied to the coil for the initial ignition charge.
A small A/C signal from the stator pulse coil triggers the CDI to fire the coil.
DC/ignition systems have the ability to ignite with as little as
6 volts of power.
Some of the advantages of DC ignition are:
• Stronger, more consistent spark at low rpm for better performance
•Easier starts
• Fault detection by the ECU (EFI)
NOTE: Do not remove wiring harness while the key switch is on or while the engine is running. Damage to
electronic components may occur!
SPORTSMAN FOREST TRACTOR 500 EFI
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