Polaris msx 110 Service Manual page 166

FUEL INJECTION / IGNITION / EXHAUST SYSTEMS
Troubleshooting - - Engine Lacks Performance / RPM Limits - - Continued
Indicated Problem
Engine RPM limited to 4700 ± 200 and the
CHECK ENGINE MIL LIGHT is on.
Engine RPM is limited to 4500 - - 5500 after
initially starting engine.
Engine RPM is limited to 6000 to 6500.
Engine RPM is limited to 6800 to 7000.
Boat fails to reach top speed.
2004 Four Stroke PWC Service Manual
Suspected Problem
ECU has detected an overboost condition.
ECU will limit engine RPM in the event that
the internal engine temperature is below
60C. This is a protection feature.
Air leak within air intake system or boost
control system.
ECU is detecting either or knock sensor fail-
ure or a auto- -ignition condition exists. (Pis-
ton Knock)
ECU will retard engine timing up to 9 de-
grees BTDC when knock sensor fails or de-
tects auto- -ignition. If condition persists,
ECU will open wastegate solenoid and drop
boost pressure.
All of the above +
Turbocharger not making enough boost
pressure.
Mechanical failure with engine, engine sub-
system, or pump assembly.
Environmental Conditions.
Solution
Stop engine, pull lanyard and then re- -insert
lanyard.
If problem persists, check air intake system
hoses for leaks.
Use diagnostic software and check for
trouble codes.
Check all boost control hoses.
Check operation of wastegate solenoid.
Check wastegate linkage and wastegate
operation.
Verify oil level is not over MAXIMUM.
Clean boost control hose banjo bolt fitting.
Full power will return once engine warms
up.
Check all hoses associated with air intake
system and boost control system.
Check for air leaks.
Use diagnostic software to check for trouble
codes and operating parameters.
Use PREMIUM GRADE fuel to obtain maxi-
mum engine performance. 91, 92, or 93 oc-
tane recommended.
Check for foreign material or water within
fuel system.
Check boost control hose connected to fuel
pressure regulator.
Use diagnostic software to check for trouble
codes.
Verify correct impeller is installed.
Use diagnostic software to download trouble
codes.
Check the spark plugs for proper gap, etc..
Check ignition coils.
Check the engine and chassis wiring har-
nessess for damage.
Check and perform all maintenance- -related
issues.
Perform the boost pressure check by con-
necting a pressure gauge to the air intake
manifold drain fitting.
If boost pressure is lower than specification,
check the following:
Check air intake system for leaks.
Check or replace Boost sensor
Check boost control hoses.
Check or replace wastegate solenoid.
Visually inspect the turbocharger turbine
and compressor wheels and blades. Re-
place turbocharger is blades are damaged
or worn.
Use PREMIUM GRADE fuel to obtain maxi-
mum engine performance. 91, 92, 93 oc-
tane recommended.
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