4.20
ELECTRONIC FUEL INJECTION
9924096 - 2013 RANGER RZR XP 900 / RZR XP 4 900 Service Manual
© Copyright 2012 Polaris Sales Inc.
IDLE AIR CONTROL VALVE (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.
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 plates 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 cargo box access panel (A).
2. Locate the IAC valve above the engine and
disconnect the vehicle harness (C) from the IAC
motor.
3. Remove the (3) Phillips-head mounting screws (C)
and remove the IAC motor from the IAC housing.
4. Install the new IAC motor and torque the mounting
screws to specification.
NOTE: Make sure not to twist or pinch the IAC lines
upon assembly.
5. Reconnect the vehicle harness to the IAC motor.
6. Reinstall the cargo box access panel.
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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