Ecu Removal / Replacement; Fuel Pump - Polaris 2009 Sportsman XP 850 Service Manual

ECU Removal / Replacement

1. Remove the seat and upper left-hand side panel (see
Chapter 9 "Seat and Side Panels").
2. With the ignition turned off, disconnect the wire harness
from the ECU by pulling the black slider out away from the
ECU while pulling down on the connector. Once the slider
is fully extended, pull the connector from the ECU, using
care not to damage the connector or locking mechanism.
3. Remove the (4) screws retaining the ECU to the airbox and
remove the ECU.
4. To install, reverse the previous steps. DO NOT apply
dielectric grease to the connector, as it is a sealed connector.
Tighten screws to 10 in. lbs. (1.1 Nm).
ECU Retaining Screws
10 in. lbs. (1.1 Nm)
IMPORTANT: If replacing the ECU, you must reflash
the new ECU with the correct calibration upon
installation and prior to attempting to start the vehicle.
= T
ELECTRONIC FUEL INJECTION

FUEL PUMP

Operation
NOTE: All EFI units utilize quick connect fuel lines.
An electric fuel pump assembly is used to transfer fuel to the EFI
system from inside the fuel tank. This assembly includes the fuel
pump, regulator and fuel gauge sender. The pump is rated for a
minimum output of 25 liters per hour at 43 psi and has a non-
serviceable preliminary 65-micron filter.
Fuel pump is not
serviceable, picture
for reference only.
Fuel Gauge
Sender
Preliminary Filter
65-micron
When the key switch is turned to "ON", the ECU activates the
fuel pump, which pressurizes the system for start-up.
The ECU switches off the pump preventing the continued
delivery of fuel in these instances:
• If the key switch is not promptly turned to the "start"
position.
• If the engine fails to start.
• If the engine is stopped with the key switch "ON" (as in
the case of an accident).
3
Regulator
Fuel Pump
3.11