Snowmobile Polaris 2006 - 2007 FS / FST. Instruction - part 21

 

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Snowmobile Polaris 2006 - 2007 FS / FST. Instruction - part 21

 

 

4.25

EFI / Ignition Systems

4

Rev. 1 07/2006

Wastegate Solenoid Pulse Valve Circuit (FST 

Only)

The wastegate solenoid pulse valve allows the ECU to control
the amount of boost pressure within the induction system. Boost
control is accomplished by pulsing the valve at different
frequencies depending on the amount of boost pressure within
the induction system. If the ECU determines that the targeted
boost pressure has been obtained, the ECU will trigger the pulse
valve so that a certain level of compressor pressure is routed to

the wastegate actuator. Doing so activates the wastegate so that
a proportion of exhaust gas bypasses the turbine.

In the event that power to the wastegate solenoid is lost, the
solenoid defaults so that all of the compressor pressure is routed
to the wastegate actuator. When this occurs, maximum boost
pressure will be limited to the wastegate’s internal spring pop-
off pressure of 6 - 6.5 lbs. (413 - 448 milliBAR)

The wastegate solenoid is located on the front of the air box next
to the turbocharger.

4.26

EFI / Ignition Systems

Rev. 1 07/2006

Wide Band Lambda Sensor Circuit

The wide band lambda sensor (O2) is responsible for measuring
the amount of oxygen within the exhaust stream and the actual
deviation from lambda = 1. A heater element within the sensor
allows the sensor to quickly reach the desirable sensor operating
temperature after the engine is started.

The lambda sensor is located on the exhaust pipe after the
turbocharger on FST models. On FS models, the sensor is
located on the manifold. It is important not to contaminate the
sensor probe with engine coolant or solvents.

4.27

EFI / Ignition Systems

4

Rev. 1 07/2006

Idle Air Control Actuator Circuit

The idle air control actuator (IAC) is a stepper motor that varies
the amount of air bypassed around the throttle plates when the
engine is idling. The IAC allows the ECU to compensate for
changes in ambient temperature, altitude and engine
temperatures without having to re-set the throttle plate gap.

The IAC is located underneath the console. Two hoses attach to
the throttle body, while one large hose connects to the airbox on
the FST. FS models has two hoses attached to the throttle body
with a foam filter on the IAC inlet..

4.28

EFI / Ignition Systems

Rev. 1 07/2006

Roll Over Sensor Circuit

The roll over sensor or “tilt switch” is a Hall Effect type sensor
that tells the ECU when the vehicle has rolled more than 65
degrees left or right. The arrow and “UP” labels on the sensor

must be followed as sensor orientation is critical to proper
operation. 

The sensor is located on the bulkhead in the right-front nose of
the snowmobile.

 

 

 

 

 

 

 

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