4.27
ELECTRONIC FUEL INJECTION
4
9923523 - 2012 RANGER RZR 570 Service Manual
© Copyright 2011 Polaris Sales Inc.
Fuel Tank Installation
1. Carefully reinstall the fuel tank assembly.
2. Reinstall the (2) fuel tank brackets and fasteners.
3. Reinstall the (3) shift lever support bracket fasteners.
4. Reinstall the rear R H fender well and secure
with
fasteners .
5. Reinstall the se at belt me chanism an d se cure the
low
er bolt.
6. Reinstall the RH ro cker pa nel a nd all p reviously
r
emoved fasteners.
7. Reinstall the rear seat base / su pport assembly and
secure wit
h the fasteners.
8. Reinstall the center console and shift knob.
9. Install the fuel line, vent hose and clamp. Verify they
are secure.
10. Reconnect the fuel pump electrical harness.
11. Reconnect the n egative batter
y cable. Test th e fuel
pump by turning the ignition key on and listening for
the pump to activate. Check for leaks.
12. Finally, install the re ar ser vice panel a long with the
seat
s.
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
m
otor 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 teste d’ u sing 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 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
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