Manifold Air Pressure Sensor (Map); Operation Overview; Map Sensor Test; Map Sensor Replacement - Polaris A12MH46AX Service Manual

6. Set the air gap of the new sensor to the specified
distance away from the ring gear. Torque the retaining
screws to specification and reverify air gap.
0.4 - 1.2 mm (0.015 - .047 in.)
CPS Air Gap:
0.4 - 1.2 mm (0.015 - .047 in.)
CPS Retaining Screws:
26-34 in. lbs. (2.9-3.92 Nm)
MANIFOLD AIR PRESSURE SENSOR
(MAP)

Operation Overview

Mounted on the throttle body intake, the manifold air
pressure sensor (MAP) measures air passing and
provides the ECU with the manifold pressure during
engine operation. This allows the ECU to adjust the fueling
according to actual engine load as well as identify which
stroke is the intake stroke. The MAP sensor also provides
the ECU with the ability to compensate for high altitude
operation without any recalibration.
During initial start-up, the ECU is in a "waste spark - waste
fuel" mode until the MAP sensor sends a negative
pressure reading, indicating that the engine is on the
intake stroke. Once this has been 'learned', the ECU will
= In. / mm.
= T
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
500 EFI FUEL SYSTEM
then monitor the MAP sensor and cease the initial start-up
program.

Map Sensor Test

MAP sensors are a non-serviceable item. If it is faulty, it
must be replaced. This sensor requires a 5 Vdc input to
operate, therefore the MAP sensor should only be tested
using Polaris Diagnostic Software (dealer only). Refer to
the EFI Diagnostic Software Manual for more information.

Map Sensor Replacement

1. Disconnect sensor from engine harness.
2. Using a suitable tool, remove the retaining screw and
replace the sensor, using a light coating of soapy
water on the grommet to aid installation.
NOTE: Replacement MAP sensors may have an o-
ring installed that must be removed prior to
installing the grommet.
3. Install the sensor as shown in Figure 1, inserting it with
a twisting motion to properly seat the grommet. Verify
that the connector centerline is aligned with the
throttle body centerline.
4. Install the retaining bracket. NOTE: Do not allow the
retaining bracket to contact the MAP body. Torque
the retaining screw to specification.
MAP Retaining Screw:
29 in. lbs. (3.3 Nm)
FIG. 1
= T
4.49
4