Select the dcv value on the multimeter that is closest to yet bigger than the source voltage.
Knock sensor resistance value.
Engine performance diagnostics chapter 10 pages 6 7.
Knock occurs if any of the following are present.
The knock sensor detects vibrations that come from a knock or an irregularity in combustion and send a signal to the engine control computer which then adjusts timing to correct the knock.
Since knock sensor is practically a microphone testing proper operation of is rather hard.
Detonation is the result of fuel and air mixture exploding quickly instead of burning evenly.
A failed knock sensor will register a trouble code and illuminate the check engine lamp cel although some engines will require.
Other manufactures are doing the same thing making the circuit very easy to test.
Malfunction indicator lamp mil illumination.
Lean air fuel ratio causing high temperature.
This procedure applies to any knock sensor that has a bias voltage sent to it and is not unique to nissan.
I suppose you can compare voltage output of your sensor to.
Very high combustion temperatures.
The particular knock sensor i was testing measured at about 6 7nf temperature dependant sensor alone or 7 5nf with the wiring.
Bad knock sensor symptoms.
Turn on the power source.
If not the voltage source is at least a problem if not the.
Verify that the voltage at the sensor is within the range suggested in your user manual.
The knock sensor is a crucial part of the engine as detonation is harmful to the engine.
Although you ll be able to tell if it s completely dead service manual calls for tapping on the side of the block with something metalic and making sure sensor outputs a knock reading.
The test is very simple i have unplugged the sensor from the ecu plugged one probe form the multimeter set to capacitance range to the pin for the knock sensor on the ecu plug and another on chassis earth ground.
In this video i will show you how to quickly test a knock sensor circuit.
Carbon deposits pre igniting the air fuel mixture.
