4.6
9850068 R01 - 2020-2021 RZR PRO XP / XP 4 Service Manual
© Copyright Polaris Industries Inc.
KNOCK SENSOR
KNOCK SENSOR OVERVIEW
The knock sensor is located on the cylinder block, below
the MAG intake port.
The knock sensor “listens” for combustion knock by
converting internal engine noise in to an electrical signal.
The ECU uses the signal to determine the level of knock
within the combustion chambers after each combustion
event.
When the ECU determines detonation has occurred, the
CHECK ENGINE lamp will turn on.
The ECU will retard timing first and then reduce the boost
target if detonation continues.
If detonation occurs:
• Drain the fuel and fill with fresh fuel. Always use
premium fuel (91+ octane)
• Check for non-approved Polaris modifications to the
engine or exhaust system
• Verify there is no water or foreign material in the fuel
• Verify there is no internal engine damage
• Verify the cooling system is working properly
NOTICE
Install the knock sensor fastener clean and without
thread locker or oil.
KNOCK SENSOR TESTING
1. Disconnect the harness going to the knock sensor.
2. Use a multimeter to ohm between the two pins on the
sensor harness.
Knock Sensor:
4,870 kΩ
3. If the sensor measures OL between the pins or there
is continuity to chassis ground, replace the knock
sensor.
KNOCK SENSOR REPLACEMENT
1. Disconnect the harness
q
going to the knock sensor.
2. Remove the knock sensor mounting bolt
w
and
remove the sensor from the cylinder.
NOTICE
The knock sensor does not run through a coolant jacket
in the cylinder. No fluid should come out of the hole
when the sensor is removed.
3. Install the new knock sensor. The knock sensor
should be orientated so the sensor lead does not rub
on any component. The sensor lead should point
straight back and be retained. Torque mounting bolt
to specification.
TORQUE
Knock Sensor Mounting Bolt:
15 ft-lb (20 Nm)
4. Connect knock sensor harness.
ENGINE ELECTRICAL
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