Polaris 2007 Sportsman 450 EFI, Service Manual

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10.28
ELECTRICAL
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 volt DC current is supplied directly from the battery
to the PDM. At the PDM, DC current is supplied to the ignition coil for the initial ignition charge. A small A/C signal from the CPS
helps the ECM pre-determine Top Dead Center (TDC), which in turn signals the ECM to release the electrical charge collapsing the
coil field for ignition (based on the ECM timing map).
CDI- A 12 volt DC current is supplied directly from the battery to the CDI. At the CDI, a 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 ECM (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 500 / 500 X2 EFI
SPORTSMAN 450