Polaris 2012 Sportsman Forest 500 International, Service Manual

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4.51
500 EFI FUEL SYSTEM
4
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
Idle Air Control Replacement
1. Disconnect the IAC from the engine harness.
2. Using a suitable tool, remove the retaining screws and
replace the sensor.
3. Torque the retaining screws to specification.
THROTTLE POSITION SENSOR (TPS)
Operation Overview
The throttle position sensor (TPS), mounted to the throttle
body, is used to indicate throttle plate angle to the ECU.
Mounted on the throttle body and operated directly off the
end of the throttle shaft, the TPS works like a rheostat,
varying the voltage signal to the ECU in direct correlation
to the angle of the throttle plate. This signal is processed
by the ECU and compared to the internal pre-programmed
maps to determine the required fuel and ignition settings
for the amount of engine load.
Throttle Position Sensor Test
The throttle position sensor (TPS) is a non-serviceable
item. If it is faulty, it must be replaced. It can be tested using
the following method:
Using an ohmmeter-
1. With the test leads connected and the meter set to
the ohms scale, observe the reading at the following
pin locations of the TPS:
= T
IAC Retaining Screws:
17.7 in. lbs. (2 ± 0.5 Nm)
The correct position of the throttle body idle
stop is established and set at the factory. Do not
loosen the throttle body idle stop or alter the
stop position in any fashion. If the stop is
repositioned, the entire throttle body assembly
must be replaced.
Table 4-1: TPS Resistance Readings
Pin Throttle Position Resistance
2 to GND -----

1 - 2
Closed 4K

(reference)
1 - 2 Open 820

(reference)
1 - 3
----- 4k

6k

1
2 3