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4.29
ELECTRONIC FUEL INJECTION
4
9923142 - 2011 RANGER RZR / RZR S / RZR 4 Service Manual
© Copyright 2010 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 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.
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
clamps.
9. Reinstall the rear cargo box, rear service panel and seats
(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
IAC
1
23
4
5
6
IAC Valve Connector
= T
IAC Mounting Screw Torque:
17.7 in. lbs. (2 ± 0.5 Nm)
IAC