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9850068 R01 - 2020-2021 RZR PRO XP / XP 4 Service Manual
© Copyright Polaris Industries Inc.
WASTEGATE FLAPPER INSPECTION
Due to the high pressures and temperatures seen in the
turbine, the wastegate flapper and associated
components are susceptible to wear after extended use.
q
Outer Crank Arm
e
Wastegate Flapper
Arm
w
Wastegate Flapper
Disc
r
Wastegate Flapper
Bushing
Looking inside the turbine outlet, ensure the wastegate
flapper is closed flat against the turbine seat. Ensure the
flapper disc is properly sealed over the wastegate port,
and that no gap is visible that can let exhaust gas past
the wastegate when fully closed.
P1234 BOOST REFERENCE CODE
TROUBLESHOOTING
1. Visually inspect all vacuum lines, and boost reference
lines.
2. Verify all reference/vent lines to control valve are free-
flowing and clear of debris.
3. Remove intake bezels and check for any foreign
objects/debris.
BOOST CONTROL VALVE
Inspect the boost control valve for:
• Plugged vent line.
• Plugged actuator pod line.
• Stuck solenoid.
1. Supply boost control valve with power and ground.
Pressure will flow from the compressor housing line
to the boost control valve. The boost control valve will
send boost pressure to vent line. No pressure should
be seen at the actuator pod.
ENGINE / COOLING SYSTEM
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