4
9940259 R02 - 2022 RZR PRO R / PRO R 4 Service Manual
© Copyright Polaris Industries Inc.
4.5
KNOCK SENSOR
KNOCK SENSOR OVERVIEW
The knock sensor
q
is located on the right side of the
block, next to the starter.
The knock sensor “listens” for 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 knock continues.
If knock occurs:
• Drain the fuel and fill with fresh fuel.
• 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
KNOCK SENSOR TESTING
1. Disconnect the harness going to the knock sensor.
2. Set multimeter to “ohms”. Check resistance between
the two pins on the sensor.
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 going to the knock sensor.
2. Remove the knock sensor mounting bolt
q
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 forward. Torque mounting bolt to
specification.
TORQUE
Knock Sensor Fastener:
15 ft-lbs (20 Nm)
4. Connect knock sensor harness.
ENGINE ELECTRICAL
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