Since knock sensor is practically a microphone testing proper operation of is rather hard.
Knock sensor resistance value.
Lean air fuel ratio causing high temperature.
Turn on the power source.
Consistent engine knock and associated sensor faults may cause the following symptoms.
Very high combustion temperatures.
A failed knock sensor will register a trouble code and illuminate the check engine lamp cel although some engines will require.
If not the voltage source is at least a problem if not the.
I suppose you can compare voltage output of your sensor to.
Carbon deposits pre igniting the air fuel mixture.
The knock sensor within your vehicle is a component designed to listen for engine detonation or knocking.
In this video i will show you how to quickly test a knock sensor circuit.
The particular knock sensor i was testing measured at about 6 7nf temperature dependant sensor alone or 7 5nf with the wiring.
The knock sensor is a crucial part of the engine as detonation is harmful to the engine.
Other manufactures are doing the same thing making the circuit very easy to test.
Select the dcv value on the multimeter that is closest to yet bigger than the source voltage.
Bad knock sensor symptoms.
Detonation is the result of fuel and air mixture exploding quickly instead of burning evenly.
Malfunction indicator lamp mil illumination.
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.
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.
Verify that the voltage at the sensor is within the range suggested in your user manual.
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.
Knock occurs if any of the following are present.
