4.17
ELECTRONIC FUEL INJECTION
4
9924096 - 2013 RANGER RZR XP 900 / RZR XP 4 900 Service Manual
© Copyright 2012 Polaris Sales Inc.
3. With the ignition turned off, disconnect the wire
harness from the ECU. Lift the connector locking lever
and rotate it up until the connector is free from the
ECU.
NOTE: Upon removing the ECU connector, you
should hear a “click” when the connector is fully
open.
4. To install, reverse the procedure and tighten the
mounting screws to specification.
NOTE: Upon installing the ECU connector, you
should hear a “click” when the connector is fully
closed.
MANIFOLD AIR QUALITY SENSOR
(MAQS)
Operation Overview
Mounted on the end of the dual throttle body assembly, the
MAQS performs three functions in one unit. The MAQS
detects intake air temperature, manifold absolute
pressure and throttle position.
These sensor signals, comprised of separate intake air
temperature, manifold absolute pressure readings and
throttle plate position are processed by the ECU and
compared to its programming for determining the fuel and
ignition requirements during engine operation. The MAQS
provides the ECU with engine load data.
MAQS Test / Replacement
The MAQS is a non-serviceable item and can only be
tested using Digital Wrench®. If the sensor is faulty, the
dual throttle body assembly must be replaced. Refer to
“Throttle Body Removal” procedure.
IMPORTANT: This sensor should only be tested using
Digital Wrench® Diagnostic Software (dealer only).
ECU Retaining Screws:
10 in-lbs (1.1 Nm)
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