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Thread: ECU Codes?

  1. #1
    LX User Christofur's Avatar
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    ECU Codes?

    ok so i looked at my ECU some time ago and noticed some red lights on. Pic

    High res img so made it a link
    http://christofurmay.com/IMG/3geez/20120327_092928.jpg


    i was reading that code one means 02 sensor so i changed it and im still getting the same codes.

    anyone know what code 2 means? i only have one o2 sensor.


    also when my car is cold it runs perfect. but once it gets to operating temp its stuffs to miss fire a lot and lacks power?


    i have tried resetting my ECU but codes come up right away.


    and help would be great. ty



  2. #2
    LX User charliefowle03's Avatar
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    Re: ECU Codes?

    hmm, curios what year is your accord? where is the ecu at?

  3. #3
    DX User huntz0r's Avatar
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    Re: ECU Codes?

    Those aren't three error codes in the pic, it's a "1-2-8" error code. Page 11-53 of the '85 FSM lists what each combination means. (The "1" lit up alone is indeed an O2 sensor problem, but that's not your code.) For 1-2-8 it says:

    Possible cause:
    -Disconnected idle mixture adjuster sensor coupler
    -Shorted or disconnected idle mixture adjuster sensor wire
    -Faulty idle mixture adjuster sensor

    Symptom:
    -No particular symptom shown
    -High idle speed


    It may be your symptoms are another problem on top of this, but it's a place to start. Are there any other code combinations?
    Last edited by huntz0r; 03-30-2012 at 11:40 AM.

  4. #4
    LX User Christofur's Avatar
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    Re: ECU Codes?

    Quote Originally Posted by charliefowle03 View Post
    hmm, curios what year is your accord? where is the ecu at?
    I have an 85 SEI its under the drivers seat.

    Quote Originally Posted by huntz0r View Post
    Those aren't three error codes in the pic, it's a "1-2-8" error code. Page 11-53 of the '85 FSM lists what each combination means. (The "1" lit up alone is indeed an O2 sensor problem, but that's not your code.) For 1-2-8 it says:

    Possible cause:
    -Disconnected idle mixture adjuster sensor coupler
    -Shorted or disconnected idle mixture adjuster sensor wire
    -Faulty idle mixture adjuster sensor

    Symptom:
    -No particular symptom shown
    -High idle speed


    It may be your symptoms are another problem on top of this, but it's a place to start. Are there any other code combinations?
    well i don't have a high idle. but where is this idle mixture sensor located?

    another thing is. i am running my SEi ECU with an a20 swap. idk if that makes a difference

  5. #5
    3Geez Veteran A18A's Avatar
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    Re: ECU Codes?

    I would install a a20 ecu & hope it shuts up. iirc my 4g accord had a IMA sensor, it was just a little potentiometer (i think) mounted near the ecu. that you could adjust with a screw driver

  6. #6
    2.0Si User ShyBoyCA6's Avatar
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    Re: ECU Codes?

    The A20 requires 2 O2 sensors to work properly. Even though you did the swap im guessing you used the A20 stock ecu and harness? If so then you need 2. if led light is on and doesnt blinks then ecu is bad. Other thing is that its grounding itself somewhere.
    also green is left and white is right.

  7. #7
    LX User Christofur's Avatar
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    Re: ECU Codes?

    2 O2 sensors?

    wheres the second one located? there is only one on my header.

  8. #8
    2.0Si User ShyBoyCA6's Avatar
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    Re: ECU Codes?

    Quote Originally Posted by Christofur View Post
    2 O2 sensors?

    wheres the second one located? there is only one on my header.
    Right next to it. Is it FI or Carb?

  9. #9
    LX User Christofur's Avatar
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    Re: ECU Codes?

    Its FI and theres only one o2 Sensor.


    the engine was out of an 86 lude. maybe they only ran one o2.

  10. #10

    2ndGenGuy's Avatar
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    Re: ECU Codes?

    Christofur, your car is only going to have 1 O2 sensor. Your ecu only requires 1, so it doesn't matter what engine you have. The A20 would only need two if your ECU required two of them hence A20 ECU. The A20 used the two sensors up in the header or downpipe.

  11. #11
    LX User Christofur's Avatar
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    Re: ECU Codes?

    Thanks John im crossing that off my list.

    now this IMA sensor looks like it was in the number 1 black box which i removed last summer. and i believe its in storage now. so on my weekend ill go to the junkyard and pick one up.

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