Engine Cranks But Does Not Start - Polaris RZR PRO R Service Manual

GENERAL INFORMATION

ENGINE CRANKS BUT DOES NOT START

1. Check battery voltage while cranking. If voltage is
below 10.8V, vehicle may not start.
• Perform Voltage Drop Test on Starter Circuit. Refer
to Testing Voltage Drop page 1.66 for more
information. Acceptable drop is 0.1V per
connection, if too much drop is detected concern
may be caused by faulty starter, or solenoid.
• Charge battery.
• If equipped with a serviceable battery, check
battery electrolyte level. Fill following procedure if
low.
• If battery voltage is not ~12.6 V charge battery at
recommended rate. Attempt starting after charging.
• If battery still does not reach ~12.6 V, battery may
require replacement.
2. Visually inspect vehicle for any electrical connectors
or wiring that may be loose or damaged. Check
connectors for water intrusion or corrosion.
• If connections are found to be loose, repair
connector as necessary.
• If connector is found to have corrosion or water
within connectors, clean, dry, and reconnect.
• Repair any damage to wiring.
3. Check vehicle for trouble codes. Refer to Digital
Wrench® Diagnostic.
• If codes are present proceed with testing per Digital
Wrench®.
4. Check air box and filter for debris or moisture.
• If debris is found clear debris and recheck for
concern.
• If water is found within air box, dry box and filter. It
is possible that engine may have ingested water.
This could cause engine failure, refer to Engine
Troubleshooting page 1.29
5. Check fuel level and condition in vehicle.
• Possible to have incorrect reading from fuel gauge.
Using a flashlight, check for fuel in tank. If no fuel is
visible, fill with fuel before further diagnostic.
• Check fuel quality, pull fuel sample or drain tank
and refill with fresh fuel from a reliable source.
IMPORTANT
When filling with fuel, ensure that the fuel being used
meets the correct octane rating specific to the vehicle.
• If filled with fuel, vehicle starts, and gauge still is not
reading test the fuel sending unit.
1.24
6. Check fuses or fuel system relays (where applicable).
• If any fuel related system fuses are blown, replace
fuses and recheck. Wiring concern or faulty parts may
cause fuse to blow.
• It is advisable to try swapping a relay with a known
good relay to check operation. Swap relay with like
relay and see if vehicle starts.
7. Check fuel lines and fittings for leaks or damage.
• If leak or damage is found repair, replace as
necessary and recheck concern.
• If no concerns are found proceed with fuel pressure
testing.
8. Perform a fuel pressure test during engine cranking.
• Verify that battery voltage is present at the fuel
pump. A low voltage concern may cause the pump
to be inoperable.
• Check using fuel pressure gauge to see that fuel
pressure is within specification.
• If not within specification, if equipped check fuel
filter / screen for restriction.
• If no concern is found with filter or pressure is still
low after filter replacement, suspect weak or faulty
fuel pump.
9. Inspect spark plug wiring, spark plug, and check for
spark.
• Check to make sure that spark plug is tight.
• Inspect spark plug for fouling. Inspect plug gap
using feeler gauge or similar tool. Adjust to
specification if needed.
• Disconnect plug wire and install an inline spark
tester between the spark plug wire and spark plug.
Check for spark. If a spark tester is not available,
remove the spark plug and reinstall wire to plug
connection. Using caution crank engine while
watching spark plug for spark.
DO NOT TOUCH SPARK PLUG DURING TEST.
TOUCHING SPARK PLUG COULD RESULT IN
ELECTRIC SHOCK.
• If plug does not spark in previous test, check
connections at ignition coil. Ensure that the ignition
coil has power and is receiving signal from the
ECU. Concern may be caused by faulty ignition coil
or electrical concern.
10. Listen for unusual noises while cranking.
9940259 R02 - 2022 RZR PRO R / PRO R 4 Service Manual
CAUTION
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