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Q: check eng light on 1990 Toyota 4Runner

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I have a check eng light when i read the code it says code 52 witch is 5 blinks followed by 2 blinks my book says its the knok sensor, not sending a singal to the ecu how do i check the sensor ?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Don't even check the harness that goes to the knock sensor, it is a short harness, inexpensive and gives a lot of problems on this engine. Replace the short little harness and sensor dealer normally has the harness in stock, sensor may be available cheaper from or another source.
What are the typical symptoms for code 52?
I have a CE light and low idle 200 -300rpm. Key cycle brings back stable idle and no CE light until rpms are raised.

Thanks for the info
Don't check it, replace it. it is very common on these. The tough thing is that it is buried under the intake manifold. If you go as far as removing the manifold, you may as well replace the sensor. Be sure to check the wiring to make sure it is not chafed etc.
this is so much fun!!! I just finished replacing the timing belt the intake manifold gaskets and valve cover gaskets, also new injector seals.
most like other cars you cant check it because it is electrc part just change it and reset your computer buy taking the battery turminal off for 10 min and put it back on thin it should work
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