CEL problem
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This is a discussion on CEL problem within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; When I was underneath my dash today I saw a connecter that was unplugged, so being the curious person I ...

  1. #1
    Registered User MarkF4E's Avatar
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    CEL problem

    When I was underneath my dash today I saw a connecter that was unplugged, so being the curious person I am I connected it. When I went to drive my car again the CEL came on. I disconnected the cable I had connected and the CEL turned off again. I have an up-pipe, and the EGT sensor is not there anymore. However there is a resistor there. Is there a certain amount of Ohms the resistor needs to be? Im attaching a pic of the connector, if you know what it goes to please speak up. The connector is the two green pieces in the picture (shown disconnected).
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    He simply abides. SD_GR's Avatar
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    Wait, I think you're talking about two different things. The CEL you saw is one you evoked by going into diagnostic mode -- it was rapidly flashing, correct? See this:

    Help! Green connector under fuse box not connected

    Now, as far as needing a resistor, yes, the value is specific. However, since your car already has one in place, and your car is not throwing a CEL unless you mess with the green connector under the dash, I don't think that's a problem. You might search for "resistor" and "value" and "CEL" for more details, but in any case I think it's a moot point.

    SD
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  4. #3
    Registered User MarkF4E's Avatar
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    Wow, thanks for the response. I am much much happier now.
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  5. #4
    He simply abides. SD_GR's Avatar
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    Quote Originally Posted by MarkF4E
    Wow, thanks for the response. I am much much happier now.
    Great, cheers!
    SD
    WRX Info Links, Courtesy TheJ
    Man is a brute.... If you're cruel to him, he respects and fears you. If you're kind to him, he plucks your eyes out. Alexis Zorbas
    I lied. I cheated. I bribed men to cover the crimes of other men. I am an accessory to murder. But the most damning thing of all... I think I can live with it. And if I had to do it all over again - I would. Benjamin Sisko
    DISCLAIMER: Opinions expressed are the author's alone and are inherently worthless.

  6. #5
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    +2 for SD_GR's comment....2 seperate things and it's the test connector.
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  7. #6
    Registered User ktmrider's Avatar
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    Sorry to highjack but this is good info.
    Does the diagnostic wire need to be connected to read the OBDII codes? I tried to have Autozone scan for my CEL and it kept erroring out with a "Link failed" message. I will try going back with the connector attached.
    The other question, what is the correct resistor value? The car I just got has the EGT wires broken off at the sensor and the pigtail removed. I can jamb a resistor in the female plug end but don't want to create more problems than solutions....
    Thanks again for any help!
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    1991 Galant VR4 - Sold
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  8. #7
    Registered User ktmrider's Avatar
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    Ok I think I answered both questions ( search engine saves the day ).
    The recommended resistor value was 2.2K ohm. I inserted one into the female connector and presto, running much better.
    I then went back to Autozone and the scanner connected no problem ( without connecting the diagnostic wire under the dash ). One code was for the EGT, no surprise, one was for fuel cutoff, also probably from the EGT, and the thrid was a mystery. P1131, "Manufacturers Specific Code" with no other info. I'll hit the search again but has anyone seen this?!?
    2005 Legacy GT - stock for now
    1991 Galant VR4 - Sold
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  9. #8
    Registered User ktmrider's Avatar
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    Fixed

    I found the P1131 code definition, "Front O2 sensor short bank1".
    Decided to trace the wires and found a crimp point near the connector hidden by the heat shrink. Cut and snip, all is good and the CEL is out!
    2005 Legacy GT - stock for now
    1991 Galant VR4 - Sold
    2002 WRX Wagon - Sold

  10. #9
    Registered User Thug Nasty's Avatar
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    Quote Originally Posted by ktmrider
    I found the P1131 code definition, "Front O2 sensor short bank1".
    Decided to trace the wires and found a crimp point near the connector hidden by the heat shrink. Cut and snip, all is good and the CEL is out!

    ktmrider - 1 , CEL - 0.

    Good job, way to be a problem solver.
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