94 lexus LS 400 no communication

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  • protraxrptr17
    Member
    • Aug 2010
    • 77

    94 lexus LS 400 no communication

    Car is hard to start and runs rough. Cant get data or codes. Tried everything on my verus. Finally borrowed a red brick from my dealer and get the same results.
  • protraxrptr17
    Member
    • Aug 2010
    • 77

    #2
    Cant even pull codes manually. Can it be a PCM issue? Tried it at the connector inside and the one outside under the hood.

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    • sbreland73
      Senior Member
      • Jan 2009
      • 1076

      #3
      You could try to scope the data line(s) and see if the PCM is trying to communicate. My past experience with these symptoms has turned out to be a faulty module. HTH.
      S. Breland

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      • josh.essary
        Junior Member
        • Aug 2012
        • 1

        #4
        May be too late for you, but Most of the Early 90's Lexus ecus are starting to fail pretty rapidly. You may get codes for fuel pump controllers or a constant rich idle. If it isn't communicating the ecu is dead.

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