Page 194 - Manual Oficina Polaris RS1 2018 e 2019

FUEL SYSTEM

EFI OPERATION OVERVIEW INITIAL PRIMING / STARTING PROCEDURE
The EFI system is designed to provide peak engine
performance with optimum fuel efficiency and lowest NOTE
possible emissions. The ignition and injection functions The injection system must be purged of all air prior to
are electronically controlled, monitored and continually the initial start up, and / or any time the system has
corrected during operation to maintain peak been disassembled.
performance.
The central component of the system is the Bosch ME17 If the EFI system is completely empty of fuel or has been
Electronic Control Unit (ECU) which manages system disassembled and repaired:
operation, determining the best combination of fuel 1. Cycle the key switch from “OFF” to “ON” 6 times,
mixture and ignition timing for the current operating waiting for approximately 3 seconds at each “ON”
conditions. cycle to allow the fuel pump to cycle and shut down.
An electric fuel pump is used to move fuel from the tank, 2. Once step 1 is completed, turn the key switch to
through the fuel supply line, to the fuel rail. Fuel pressure “START” until the engine starts or 5 seconds has
regulators located in the tank and on the end of the fuel passed.
rail, maintain system operating pressure and return
excess fuel back into the fuel tank. At the engine, fuel fed 3. If the engine failed to start, repeat step 1 for 2 more
through the fuel rail supplies fuel to the injectors, which cycles and attempt to start the engine.
inject into the intake ports. The ECU controls the amount If the engine fails to start, a problem may still exist,
of fuel by varying the length of time that the injectors are and should be diagnosed.
"on." This range can vary depending on fuel
requirements. The controlled injection of the fuel occurs NOTE
every other crankshaft revolution, or once for each 4-
stroke cycle. When the intake valve opens, the fuel/air Accurate testing of EFI components is recommended
mixture is drawn into the combustion chamber, ignited utilizing the Digital Wrench® Diagnostic Software
and burned. (dealer only).
The ECU controls the amount of fuel being injected and
the ignition timing by monitoring the primary sensor
signals for intake air temperature, manifold absolute
pressure (load), engine temperature, engine speed
(RPM) and throttle position. These primary signals are
compared to the programming in the ECU computer chip,
and the ECU adjusts the fuel delivery and ignition timing
based on these values.

During operation, the ECU has the ability to re-adjust
temporarily; providing compensation for changes in
overall engine condition and operating environment, so it
will be able to maintain the ideal air/fuel ratio.
During certain operating periods such as cold starts,
warm up, acceleration, etc., a richer air / fuel ratio is
automatically calculated by the ECU.

4.8 9928689 - 2018 RZR RS1 Service Manual
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