4.28
9926813 R04 - 2013-2016 RZR 570 Service Manual
© Copyright Polaris Industries Inc.
IDLE AIR CONTROL (IAC)
OPERATION OVERVIEW
The Idle Air Control (IAC)
q
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
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. Always test sensor at a room temperature of 70° F
(21.1 C).
IAC Resistance Readings
PINS RESISTANCE
q
-
w
≈ 26 Ω ± 10%
IAC REPLACEMENT
1. Remove the drivers seat and disconnect the
negative (-) battery cable.
2. Remove the cargo box access panel.
3. Disconnect the vehicle harness from the IAC motor.
4. Remove the three Phillips-head mounting screws
and remove the IAC from the throttle body. The
screws can also be accessed from the RH rear
wheel well area.
5. Install the new IAC and torque the mounting screws
to specification.
TORQUE
IAC Mounting Screw:
18 in-lbs (2 Nm)
6. Reconnect the vehicle harness to the IAC motor.
7. Reinstall the cargo box access panel, connect the
negative (-) battery cable and install the drivers seat.
FUEL SYSTEM
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