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Thread: Im out of ideas. Please help ID my O2 problem

  1. #11
    Joe (Moderator) joecar's Avatar
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    Yes, please attach most recent log.


    Depends on what the STFT show...

    valvetrain or PCM may or may not be a possibility

    ( and thinking about it again, clogged cat may enter the picture again )

  2. #12
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    Attaching the log file from last night.

    No STFT on this one but I'll add it to my pids and log that in the next day or two.

    Log_0072.efi

  3. #13
    Joe (Moderator) joecar's Avatar
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    That log shows that the PCM is biasing the O2 switch points differently across banks:

    O2BIAS11 = 642 mV
    O2BIAS21 = 482 mV


    take a look at table B4105, post a pic of it here.

  4. #14
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    I have both banks set to 450 mv.

    Click image for larger version. 

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  5. #15
    Joe (Moderator) joecar's Avatar
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    Hmmm... the PCM thinks the O2's are switching at different points...

  6. #16
    Joe (Moderator) joecar's Avatar
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    Can you disconnect both O2's and capture a log (showing HO2S11, HO2S21, O2BIAS11, O2BIAS21).

  7. #17
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    Sure. Should I disable dtc's?

  8. #18
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    My VE table looks a bit off but nothing else looks weird to me.

    Log_0073.efi

  9. #19
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by wcj View Post
    Sure. Should I disable dtc's?
    No.

    Quote Originally Posted by wcj View Post
    My VE table looks a bit off but nothing else looks weird to me.

    Log_0073.efi
    See in this log (with O2's disconnected) that the O2 voltages are within 450+/-20 mV...

    so this points to the problem being that the harness has a possible short to power (0.6-0.7 V) or the PCM has failed.

  10. #20
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    So it should not be reading 450 +/-20 mV? You mentioned it's possibly a short to power so it's not a ground problem then? I guess the easiest thing for me to check is the PCM if I have one available. Just need to reflash the PCM with my current OS/tune, correct?

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