Question about 1993 Toyota Corolla

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Electronic control module: error in code 52

Please help me. i'm a girl and i don't know much about cars. i was told that the ECM of my car displays code 52. i looked for free service manual in the net but i'm unsuccessful. i don't have a manual. what does it mean? what can i do? thank you so much.

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  • hustlaz_13
    hustlaz_13 Oct 17, 2008

    Thank you Toyota Ed for the prompt answer! I wasn't expecting it. I'm happy!



    Whenever I gear up, it seems that the engine is having a hard time to
    accelerate. A friend told me a while ago that my ECM is a
    automatic type which is odd because the car is manual. He didn't
    found any knock sensor.





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  • Toyota Master
  • 1,861 Answers

I will be glad toassist you.

DTC 52 on a 93 Corolla indicates a problem with the "Knock Sensor" or its circuitry. This sensor is basically a piezoelectric crystal inside a metal housing, that detects "knock" or "predetonation" in the engine, and transmits that info re the "knock" back to the ECU. Most likely, replacement of the sensor, or a repair of the wiring harness will cure your problem, if you engine is running fine, and not making any strange sounds. I hope this answers your question. If you have any others, please feel free to comment back to me. Have agreat day!

Posted on Oct 17, 2008

  • Toyota Ed Oct 17, 2008

    Glad to be of service to you!

    I would have to respectfully disagree with your friend, ECMs auto vs manual are markedly different.

    It would be very rare that the car would run at all, swapping an auto ECM for a manual, or vice versa.



    In any case, a code 52 is def indeed a knock sensor or sensor wiring issue. If it is bad, your acceleration will def be compromised, because the technical operation of the knock sensor is to adjust the actual timing of the spark, to the sparkplug, to the point of combustion in the cylinder(s).

    If the engine is "knocking" (like starting out in 5th gear), the knock sensor moves the exact millisecond of the spark firing before or after the "normal" or "optimal" point of spark, trying to eliminate the "knock". The failure of the knock sensor will set your spark timing to a base point, and you acceleration will be affected negtively, due to this DTC 52.

    You will find the knock sensor on the back of the engine (closest to the firewall, under the intake manifold. It has a solid black wire from the engine harness to the sensor.

    Inspect the wire for damage/corrosion. If the wire & the connector are OK, replace the sensor.

    Please feel free to comment back with any other issues; and please remember to rate my level of helpfulness; a rating of a "FixYa" would be greatly appreciated!

    Regards, Toyota Ed.

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While driving my AE 100 automatic it just switched off and this happened thrice till I reached home.I had to wait a few moments to start the engine every time .What could be the cause?

Posted on Nov 06, 2008

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