Question about 1995 Toyota 4Runner

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Knock sensor by-pass

Hi i got a secondhand knock sensor and i want to test it before i start stripping the motor, i plugged the sensor in with the new wire but i still get code 52, do i need to earth the unit?

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  • luis831er Jan 16, 2009

    i have the same problem and in need of help to fix this problem as well. i recently but new head gaskets on my 95 4 runner 3.0 and a brand new knock sensor. now i have code 52 witch is according to all data 1 of about 3 things witch are eather the knock sensor, knock sensor plug not hooked up all the way or the ecm (computer) is faulty i checked all but the ecm i need preaty much a new one or one off a different 4runner to check if thats the problem. i also noticed on mine that after the check engine code is erased the code doesent come on till you accelerate. i checked the timing at idle and its normal 10 degrees and at acceration it advances way to high so i think that has some thing to do with the problem. im not sure what controls the advance on the timing but i think it might be the ecm any help welcomed thanks.

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To check knock sensors just use an amp meter and see if there is continuity between the threads and the plug. if yes then its bad if no then its good.

Posted on Feb 20, 2009

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Only if it was that easy my friend you need to get to the plug and it deep under the intake manifold. I just did one on 1999 QX4 its alot of work. You will need intake gasket and the plenum gasket. Good Luck.

Posted on Dec 30, 2008

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Instructions Things You'll Need:
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  • 3/8-inch drive ratchet wrench
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  1. Open the hood, and disconnect the battery negative cable with a wrench.
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  9. Gently push the throttle body air intake tube onto the throttle body. Tighten the hose clamp with a wrench.
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Symptoms:
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OBD Code 55 - End Test.


Hope ehit help (remember comment and rated this).

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