Troubleshooting - Engine Will Not Start - Polaris 850 PRO-RMK 155 2020 Manual

GENERAL INFORMATION
DC-CFI AXYS DIAGNOSTICS
TROUBLESHOOTING – ENGINE WILL NOT
START
COMPONENT
Fuel System
Switches
Throttle Release Switch (TRS)
Fuel Pump
Engine
Mechanical
High Tension Wires / Boots
Engine Electrical
1.82
POSSIBLE PROBLEM
Fuel Quality
Fuel Level
Ignition Switch
Auxiliary Shut Off Switch
Fuel Pump Wire Harness
Fuel Pump Power
Fuel Pressure
Fuel Pump Pick-Up Sock
Spark Plug Type
Spark Plug Condition
Spark Plug Function
Cylinder Compression
Stator
Flywheel
System Power
Check the quality of fuel in the fuel tank. Use a commercially
available fuel tester to verify ethanol content is ≤ 10%.
Fill the fuel tank with fresh fuel.
Verify the key is in the ON / RUN position. Test the switch
using continuity test tables in the Electrical Chapter.
Verify the switch is pulled up. Test the switch using continuity
test tables in the Electrical Chapter.
Verify the throttle cable freeplay is set to specification. Test
the TRS using test information in the Electrical Chapter.
Verify the fuel pump wire harness is connected and no wires
are damaged.
Connect a fully-charged 12V battery to the fuel pump prime
connector. The fuel pump should turn on.
Connect Digital Wrench to the vehicle. Use Output state
control to test the fuel pump function. ECU must command
the fuel pump to turn on when using Output State Control
testing.
Fuel Pressure using a fully-charged 12V battery connected
to fuel pump prime connectors = 58 – 60 psi (400 – 413
kPa).
Inspect the fuel pump pick-up sock. Replace the sock if it is
contaminated with foreign material.
Verify the specified spark plugs are installed and gapped to
specification.
NGK BPR9ES / Gap: .027" (0.70 mm)
Replace fouled / damaged spark plugs.
Use a commercially available spark plug tester set at the
specified electrode gap.
Inspect high tension wires and boots for damage / stripped
ends.
Test both cylinders under the same conditions using the
same compression tester. Verify the compression difference
between the cylinders is ≤ 15%.
Test stator coil resistance. Reference the Electrical Chapter
for resistance specifications.
Inspect 2 and 5 tooth position sensors.
Inspect the flywheel / magnets for damage. Inspect the
flywheel key.
Connect a fully-charged 12V battery to the ECU PWR Test
Connector. Connect Digital Wrench to the vehicle. If the
engine starts when the battery is connected, disconnect the
battery and inspect the Fuel Injector Voltage on Digital
Wrench. Voltage must be 15.5 – 16 VDC. If the voltage is
lower, inspect the stator system power coil and ORANGE
wires at the ECU 26 PIN harness connector for damage.
9850060 R02 - 2020-2021 850 AXYS™ Long Track Snowmobile Service Manual
SOLUTION
© Copyright Polaris Inc.