4.6
Cleanfire Fuel Injection
CLEANFIRE™ FUEL INJECTION
System Overview
System components include:
• ECU: The
ECU controls the ignition / fuel injection
angle, chassis/battery relays, and supplies the
MFD gauge with tachometer, water temperature,
PERC, HOT, DET, and diagnostic information.
• St
ator: Stator lighting charge coil split into two
independent circuits; one for DC power (Chassis)
and one for AC power (Lighting).
• Flywhee
l: Flywheel is forged. Fan cover is
removed from flywheel.
• CFI R
egulator / Rectifier: Supplies power to the
ECU, fuel pump “boost power”, MFD, LED tail
lamp, and accessory DC power points.
• Cap
acitor: The capacitor suppresses voltage
spikes and ensures consistent voltage throughout
the DC-CFI (RED-RED/WHT) circuits.
• Cha
ssis Relay: The chassis relay on DC-CFI
models supplies power to the MFD gauge,
accessory plug and DC power test plug.
• Ignit
ion Coils: Provide ignition energy to each
spark plug. Both coils are fired at the same time.
• Fuel Injectors
(4 Injector): This system features
a set of fuel injectors mounted to the crankcase,
and a set of fuel injectors mounted to the cylinders
(ports).
• Fuel Injectors
(2 Injector): This system features
a set of fuel injectors mounted to the cylinders
(ports).
• Det
onation Sensor: Located on the cylinder
head, the detonation sensor transforms internal
acoustic information into a signal the ECU uses to
determine the amount of engine knock.
• Exha
ust Valve Solenoid: Activated by the ECU,
the solenoid controls the VES venting. When
powered, the solenoid is open allowing cylinder
pressure to vent, and the exhaust valves remain
closed (down). When power is removed, the
solenoid closes and the exhaust valves will lift.
• Thr
ottle Position Sensor (TPS): The TPS relays
the position of the throttle plates (operator throttle
input) to the ECU.
• Coolant
Temperature Sensor: Relays the engine
temperature to the ECU.
• Exha
ust Temperature Sensor: Relays the
temperature of the exhaust pipe to the ECU.
• T
emperature / Manifold Air Pressure
(T-MAP) Sensor: R
elays the current intake air
temperature and ambient air pressure to the ECU.
The sensor is located on the airbox.
• V
ehicle Speed Input: The ECU monitors the
vehicle speed supplied by the vehicle speed
sensor.
• Fue
l Pump: Supplies fuel to the fuel injectors.
Power to the fuel pump is supplied by the
regulator / rectifier.
• Dia
gnostic Connector: The ECU can
communicate with the Polaris Digital Wrench®
software and can be re-flashed, monitored and will
display trouble codes.
• AC
Regulator/Battery Charge Rectifier: The
head lamps and hand/thumb warmers are
powered by AC voltage. If snowmobile is
equipped with electric start, the regulator/rectifier
supplies DCV to charge the battery.
CFI and DC-CFI ECUs cannot be interchanged. Serious
engine damage may occur.
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