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FUEL SYSTEM
EFI OVERVIEW
PRINCIPAL COMPONENTS
The Electronic Fuel Injection (EFI) system is a complete
engine fuel and ignition management design. This
system includes the following principal components:
• Check Engine Light
• Crankshaft Position Sensor (CPS)
• Dual Throttle Body / lntake Adapter
• Engine Control Unit (ECU)
• Engine Coolant Temperature Sensor (ECT)
• Fuel Filter(s)
• Fuel Injectors
• Fuel Pressure Regulators
• Fuel Pump
• Fuel Rail
• Fuel Supply/Return Lines
• Idle Air Control Valve (IAC)
• Ignition Coil
• Temperature and Manifold Pressure Sensor (TMAP)
• Wire Harness Assembly
EFI OPERATION OVERVIEW
The EFI system is designed to provide peak engine
performance with optimum fuel efficiency and lowest
possible emissions. The ignition and injection functions
are electronically controlled, monitored and continually
corrected
during
operation
performance.
The central component of the system is the Bosch ME17
Electronic Control Unit (ECU) which manages system
operation, determining the best combination of fuel
mixture and ignition timing for the current operating
conditions.
An electric fuel pump is used to move fuel from the tank,
through the fuel supply line, to the fuel rail. Fuel pressure
regulators located in the tank and on the end of the fuel
rail, maintain system operating pressure and return
excess fuel back into the fuel tank. At the engine, fuel fed
through the fuel rail supplies fuel to the injectors, which
inject into the intake ports. The ECU controls the amount
of fuel by varying the length of time that the injectors are
"on."
This
range
can
requirements. The controlled injection of the fuel occurs
every other crankshaft revolution, or once for each 4-
stroke cycle. When the intake valve opens, the fuel/air
mixture is drawn into the combustion chamber, ignited
and burned.
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.
9926814 R08 -
4.4
to
maintain
peak
vary
depending
on
fuel
2015-2016 RZR 900
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.
INITIAL PRIMING / STARTING PROCEDURE
NOTE
The injection system must be purged of all air prior to
the initial start up, and / or any time the system has
been disassembled.
If the EFI system is completely empty of fuel or has been
disassembled and repaired:
1. Cycle the key switch from "OFF" to "ON" 6 times,
waiting for approximately 3 seconds at each "ON"
cycle to allow the fuel pump to cycle and shut down.
2. Once step 1 is completed, turn the key switch to
"START" until the engine starts or 5 seconds has
passed.
3. If the engine failed to start, repeat step 1 for 2 more
cycles and attempt to start the engine.
If the engine fails to start, a problem may still exist,
and should be diagnosed.
NOTE
Accurate testing of EFI components is recommended
utilizing the Digital Wrench® Diagnostic Software
(dealer only).
2016 RZR S 1000 Service
Manual
© Copyright Polaris Industries Inc.
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