Page 356 - Manual Oficina Polaris Sportsman 570 2014 a 2016

FUEL SYSTEM

IDLE AIR CONTROL (IAC)

IAC - 325 disconnected or inoperative, it will remain at it’s last
operated position.

IAC TEST
The IAC is a non-serviceable item. If it is faulty, it must be
replaced. It can be ‘bench tested’ using the following
method:
Set your meter to read Ohms. Check the resistance
values at each of the following pin locations of the IAC. If
any of the readings are out of specification, replace the
IAC.

1 IAC
2 Throttle Body
3 TPS

IAC - 570

IAC Resistance Readings

PINS RESISTANCE PINS RESISTANCE
1 - 2 30 Ω ± 1.2 Ω 4 - 5 30 Ω ± 1.2 Ω
2 - 3 30 Ω ± 1.2 Ω 5 - 6 30 Ω ± 1.2 Ω
1 - 3 60 Ω ± 2.4 Ω 4 - 6 60 Ω ± 2.4 Ω

Valve Extension Range:
• Full Extension = 0 Steps (Passage Closed)
• Full Retraction = 122 Steps (Passage Open)
q IAC
w Throttle Body

e TPS

IAC OVERVIEW
The Idle Air Control (IAC) is used to stabilize the idle
quality of the engine at cold start-up and after warm-up
operations.
Mounted on the throttle body, the IAC contains 1 stepper
motor which receives varying voltage signal pulses from
the ECU. These pulses determine the IAC plunger
setting, thereby controlling the amount of air bypassing
the closed throttle body for idle control. If the IAC is

4.40 9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual
© Copyright Polaris Industries Inc.