Page 241 - Manual Oficina Polaris RS1 2018 e 2019

FUEL SYSTEM

CYLINDER MISFIRE DETECTION • Fuel pressure is within specification
• Fresh/good quality fuel is in the fuel tank
NOTE • Engine mechanical is good (leak down, timing)
• Confirm the belt is in good condition, specifically
This process only applies to some MY15 and later
models. looking for signs of hour-glassing
• Confirm primary clutch operation (worn/incorrect
Refer to this procedure only if one of the codes shown weights, loose spider/jam nut)
below is displayed in Digital Wrench.
• Confirm secondary clutch operation (sliders, rollers,
helix)
The ECU monitors crankshaft speed via the crankshaft
position sensor. A misfire will cause a fluctuation in
crankshaft speed. A code will set and turn on the check EFI TROUBLESHOOTING
engine light after an engine misfire threshold/rate is
detected that is above a pre-determined limit. This Fuel Starvation / Lean Mixture
threshold varies based on engine speed. Symptoms: Hard start or no start, bog, backfire, popping
One or more of the following codes will be set if a misfire through intake / exhaust, hesitation, detonation, low 4
occurs: power, spark plug erosion, engine runs hot, surging, high
idle, idle speed erratic.
• P0301 (SPN 65591/FMI 7) Misfire Detected, Cylinder
1 (MAG) • No fuel in tank
• P0302 (SPN 65592/FMI 7) Misfire Detected, Cylinder • Restricted tank vent, or routed improperly
2 (PTO) • Fuel lines or fuel injectors restricted
• P0314 (SPN 65590/FMI 7) Misfire Detected, Cylinder • Fuel filter plugged
Not Identified • Fuel pump inoperative
• Air leak in system
Once a cylinder misfire code is set, the following events • Intake air leak (throttle shaft, intake ducts, air box
will occur: cover)
• Check Engine Light illuminates Rich Mixture
• If the cylinder can be detected by the ECU (code
P0301 or P0302), the ECU will deactivate the fuel Symptoms: Fouls spark plugs, black, sooty exhaust
injector for that cylinder. This will remain in effect until smoke, rough idle, poor fuel economy, engine runs
the key is cycled off and back on. rough/ misses, poor performance, bog, engine loads up,
• If the cylinder with the misfire cannot be detected backfire.
(code P0314), the ECU will limit available power by • Air intake restricted (inspect intake duct)
limiting how far the throttle plate opens.
• Air filter dirty/plugged
One the key is cycled, the trouble code (s) will show • Poor fuel quality (old fuel)
current but there will be no fuel injector deactivation or • Fouled spark plug
throttle limitation unless the misfiring continues to occur. • Injector failure
The check engine light will remain illuminated until there
are 4000 engine revolutions (i. e. 4000 RPM for one Poor Idle
minute) without a significant misfire being detected. Symptom: Idle Too High (if > 1400 RPM when warm).
Once this condition is met, the check engine light will turn
off and the code(s) will show as historic. • Throttle stop screw tampering
• Throttle cable sticking, improperly adjusted, routed
If a misfire code has been set and there is no observed incorrectly
misfire, cycle the key and allow 4000 engine revolutions • Faulty electrical connection
to see if the check engine light turns off. If it does not turn
off, diagnose by verifying the following items: Symptom: Idle Too Low (if < 1100 RPM when warm).
• Low battery voltage (loose connection, low charge, • Plugged air filter
bad battery) • Leaking injector (rich condition)
• Faulty voltage regulator • Belt dragging
• Ignition Coil and connections are good • Throttle stop screw tampering
• Spark plugs wires are secure
• The correct spark plugs are installed and the plugs are Symptom: Erratic Idle.
not fouled
• Crankshaft Position Sensor tests good • Throttle cable incorrectly adjusted
• Wiring to the Crankshaft Position Sensor, ECU and • Air Leaks, dirty injector
Ignition Coil are not damaged. Chassis ground is clean • TMAP damaged (check with Digital Wrench®)
and tight • Tight valves (low compression or high leakdown)

9928689 - 2018 RZR RS1 Service Manual 4.55
© Copyright Polaris Industries Inc.