Here goes for a 1 Tu. this sensor detects detonation in the engine caused by a dirty piston head dirty valves and valve train. When it detects this detonation it tells the computer to ****** the timing so it does not burn a hole in the pistons, at the same tie it tells the computer this the computer adjust the fuel mixture ratio to decrease hot soak detonation which can occur after running the engine getting it hot and turning it off for 5 minutes and causing the gas to pre ignite due to the heat of the engine. This device is made of piezoelectric material which generates a voltage due to sound running threw the knock sensor, Ceramic disks wafered together and it has a preset low and high voltage low voltage is 1.0 DC VOLTS high is 4.0 volts dc WITH 5 VOLTS DC as a reference voltage for testing purposes. to see if it is working tap near the knock sensor and if it is working you will notice a variation in the running of the engine as it changes timing and fuel mix to stop detonation.
Testimonial: "how do you perform a top engine clean? do you have a picture of location of knock sensor related to engine?"
I forgot to mention if it is working and your getting detonation you need to do a top engine clean to get the compression down so it will function correctly. If it is at maximum buildup inside the engine changing the timing won't make a difference and it will still ping, if you want to know how to do a top engine clean ask and I will give you instructions on how to do it. If it is functioning you will notice a 2 to 3 mile per gallon difference in fuel mileage, it will be a gain after doing top engine clean up. here are some down sides to this, if your engine is worn 100,000 miles or more it is possible that the rings are worn enough that after doing a top engine clean the engine will smoke. Just a warning.
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It's a detonation sensor - it's fixed to the engine block.
Read this http://www.misterfixit.com/deton.htm
Important: The larger metal contact area of the knock sensor MUST be toward the engine block. DTC P0327 may result if the sensor is installed backwards.
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