Snowmobile Polaris 2006 - 2007 FS / FST. Manual - part 20

4.21

EFI / Ignition Systems

4

Rev. 1 07/2006

Coolant Temperature Sensor Circuit

The engine coolant temperature sensor is responsible for
relaying the engine’s internal temperature to the ECU. The

sensor is located on the intake-side of the engine, near the water
outlet manifold.

4.22

EFI / Ignition Systems

Rev. 1 07/2006

Crank Position Sensor (CPS) Circuit

The crank position sensor (CPS) is an AC signal generator that
tells the ECU how fast the crankshaft is rotating and when the
crankshaft is at TDC-MAG cylinder.

The sensor is located on the intake-side of the engine, next to the
gear cover housing.

4.23

EFI / Ignition Systems

4

Rev. 1 07/2006

Camshaft Phase Sensor Circuit

The camshaft phase sensor is a Hall Effect type sensor that tells
the ECU the position of the MAG-exhaust rocker arm. With this
information, the ECU knows the position of the camshaft and
thus, which cylinder is on its compression stroke. If the sensor

is damaged or inoperable, there a 50/50 chance of starting the
engine each time the key is turned to start.

The sensor is located on the exhaust-side of the valve cover over
the MAG cylinder.

4.24

EFI / Ignition Systems

Rev. 1 07/2006

Knock Sensor Circuit (FST Only)

The knock sensor is a piezoceramic type sensor that transforms
the internal engine acoustic information into an electrical signal.

The ECU uses this information to determine the level of
combustion knock inside each cylinder.

The knock sensor is located on the intake-side of the engine
underneath the water outlet manifold.