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1993 k1500 blazer n...
 
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1993 k1500 blazer no power to diagnostic port

  

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Tried to get a shop to hook up to diagnostic port they said no communication  years ago I used the paperclip trick and got 3 codes temp sensor, map sensor,and knock sensor I corrected thease items and replaced computer  plug and play only not flashed not getting any power to port should I be ? If so would disconnected fuel pump relay and fuse cause this?

 


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the diagnostic port probably shares a fuse with the cigar lighter


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