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Bad PCM??????

This is a discussion on Bad PCM?????? within the Computer & Tuning forums, part of the LSx Technical Help Section category; I have had a persistant P0174 code I've been looking at for a while. Make a long story short, it ...

  1. #1
    Experienced Old Fart jfl330's Avatar
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    Bad PCM??????

    I have had a persistant P0174 code I've been looking at for a while. Make a long story short, it came down to either the harness or the PCM. Check the harness last night, its fine.

    My upstream O2 on the pass side would periodically show +25% STFT and +50% LTFT's, plugs completely gas fouled.

    I looked at O2 voltages (key on, engine off) with my predator and 3 out of 4 were fine, this one showed 0 mV. Changed to another O2 sensor and same thing.

    Can this be a bad PCM as I can not think of anything else it can be.

    Jon

  2. #2
    Junior Member 06MonteSS's Avatar
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    2006 Monte Carlo SS

    Quote Originally Posted by jfl330 View Post
    I have had a persistant P0174 code I've been looking at for a while. Make a long story short, it came down to either the harness or the PCM. Check the harness last night, its fine.

    My upstream O2 on the pass side would periodically show +25% STFT and +50% LTFT's, plugs completely gas fouled.

    I looked at O2 voltages (key on, engine off) with my predator and 3 out of 4 were fine, this one showed 0 mV. Changed to another O2 sensor and same thing.

    Can this be a bad PCM as I can not think of anything else it can be.

    Jon
    no... already replied to your email...


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