4.30
ELECTRONIC FUEL INJECTION
9924125 - 2013 RANGER RZR / RZR S / RZR 4 Service Manual
© Copyright 2012 Polaris Sales Inc.
IDLE AIR CONTROL (IAC)
Operation 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
mo
tor 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
a
t each of the following pin locations of the IAC. If any of
the readings are out of specification, replace the IAC.
IAC Replacement
1. Remove the seats, rear service panel and the rear
cargo box (see Chapter 5).
2. Loosen the hose clamps retaining the throttle body.
3. Remove the throttle body from the intake track and
plug
the intake boots with a clean shop towel.
4. Disconnect the vehicle harness from the IAC motor.
5. Remove the (3) Phillips-head mounting
screws and
remove the IAC from the throttle body.
6. Install the new IAC and torque the mounting screws
to specification.
7. Reconnect the vehicle harness to the IAC motor.
8. Reinstall the throttle body and securely tighten the
hose clamp
s.
9. Reinstall the rear cargo box, rear service panel and
se
ats (see Chapter 5).
IAC Resistance Readings
Pins Resistance Pins Resistance
1 - 2 30 ± 1.2 4 - 5 30 ± 1.2
2 - 3 30 ± 1.2 5 - 6 30 ± 1.2
1 - 3 60 ± 2.4 4 - 6 60 ± 2.4
1
2
3
4
5
6
IAC Valve Connector
IAC Mounting Screw:
17.7 in-lbs (2 Nm)
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