Snowmobile Polaris 2006 - 2007 FS / FST. Manual - part 19

4.17

EFI / Ignition Systems

4

Rev. 1 07/2006

Throttle Position Sensor (TPS) Baseline 

Setting

When inspecting, adjusting, or replacing the TPS, the baseline
voltage must be set in relation to the throttle plates. This also
involves verifying that both throttle plates are synchronized
with each other. To set the baseline TPS voltage and synchronize
the throttle plates, follow these procedures:

1.

Loosen the idle speed set screw, and allow the throttle
plates to close.

2.

Loosen the throttle plate synchronization screw enough so
that the tip of the screw no longer contacts the tab.

3.

Verify the PTO throttle plate is completely closed.

4.

Disconnect the TPS connector and connect the TPS test
tool, PN 2201519 to the TPS.

5.

Using a multi meter, insert the probes into the test tool. 

6.

The displayed voltage should read 0.5Vdc.

7.

If the voltage is not 0.5Vdc, loosen the TPS screws and
rotate the TPS until 0.5Vdc is displayed on the multi meter.

8.

Tighten the TPS screws while maintaining 0.5Vdc.

9.

Slowly tighten the synchronization screw until the screw
tips makes contact with the tab.

10. Visually inspect the throttle plates, making sure the plates

are even when at wide open throttle.

NOTE: Do not over-tighten the screw as spring
damage may occur.

The TPS and throttle plates are now properly synchronized to
the baseline voltage setting.

Throttle Plate Air Gap Voltage Setting

Once the TPS baseline voltage is set and the throttle plates are
synchronized, the throttle plate air gap can be set.

1.

Verify the baseline TPS voltage is 0.5Vdc.

2.

Slowly turn the idle speed set screw clockwise until the
following voltages are observed:

• FS MODELS: 0.560Vdc

• FST MODELS: 0.585Vdc

3.

Lock the jam nut while maintaining the correct voltage.

The throttle plate air gap voltage has now been set. No further
adjustments are required as the intake air controller (IAC) will
control the engine idle speed.

4.18

EFI / Ignition Systems

Rev. 1 07/2006

Ambient Pressure Sensor Circuit (FST Only)

The ambient pressure sensor relays the absolute outside air
pressure to the ECU. The ECU uses this information to
determine the snowmobile’s operating altitude. The absolute
outside pressure is also used by the ECU as a function for several
other operating parameters such as wastegate solenoid pulse
valve control.

All three circuits that connect to the sensor are supplied and
monitored by the ECU. The sensor is located on the air box
facing the engine.

NOTE:  Bosch PN 261 230 099 stamped on cover.

4.19

EFI / Ignition Systems

4

Rev. 1 07/2006

Intake Manifold Pressure / Temperature 

Sensor Circuit

The intake manifold pressure (MAP) / temperature sensor
circuit is responsible for relaying the current manifold intake air
charge pressure and temperature. The sensor is located on the
PTO intake tube after the throttle plates.

All four circuits that connect to the sensor are supplied and
monitored by the ECU.

NOTE:  FS = Bosch PN 261 230 030

FST = Bosch PN 261 230 042
Numbers stamped on cover.

4.20

EFI / Ignition Systems

Rev. 1 07/2006

Boost Pressure Sensor Circuit (FST Only)

The boost pressure sensor is located on the boost box just before
the throttle bodies. The ECU uses this sensor to determine the
actual absolute charged air pressure within the intake system.

The sensor is located on the FST’s boost box underneath the fuel
tank.

NOTE:  Bosch PN 261 230 042 stamped on cover.