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Thread: No connection

  1. #1
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    Post No connection

    I have a 69 Camaro with an LS1/T56 from a 2001 Camaro in it. I have now a problem were I can not connect to the PCM. Efi Live says that it cannot connect to the PCM and try to turn off ignition and so on.

    I have tried with another scandevice to se if anything is wrong with my cable or Flashscan and it didn't work either.

    So how can I go forward in my search for faults. The pins 2 & 16 on the connector has voltage when ignition is on. Pin 16 has voltage when ignition is off as expected.

    The connectors Pin 2 is connected to the C230 plug pin K.

    Since I have voltage on Pin2 doesn't that mean I have signal?

    I should also say that the engine is working and runs OK.

    Any help is appreciated.


    Thanks

    Jan
    Jan Suhr
    Stockholm, Sweden
    1969 Camaro LS1/T56 Protouring Z/28
    www.protouring.se

  2. #2
    Joe (Moderator) joecar's Avatar
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    I believe you also need ground connections on pins 4 and 5.

  3. #3
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    Yes, they are of course connected to ground.


    Jan
    Jan Suhr
    Stockholm, Sweden
    1969 Camaro LS1/T56 Protouring Z/28
    www.protouring.se

  4. #4
    Joe (Moderator) joecar's Avatar
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    Here are the PCM circuit diagrams for 2001 F-body...

    87623186.gif shows the DLC connections...

    Do you have anything else connected to circuit 1049...?
    Attached Files Attached Files

  5. #5
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    It is connected like that schematic.

    I have had connection before and made a scan with Efi Live. I did also some changes like removing VATS and the O2 sensors after the cats before I started it the first time. Then everything worked as expected.

    Now it doesn't.

    Since I have voltage on Pin2 I assume there is a signal, or?


    Jan
    Jan Suhr
    Stockholm, Sweden
    1969 Camaro LS1/T56 Protouring Z/28
    www.protouring.se

  6. #6
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by jannes_z-28
    It is connected like that schematic.

    I have had connection before and made a scan with Efi Live. I did also some changes like removing VATS and the O2 sensors after the cats before I started it the first time. Then everything worked as expected.

    Now it doesn't.

    Since I have voltage on Pin2 I assume there is a signal, or?


    Jan
    It's hard to say because the signal is VPW (variable pulse width squarewave)...

    If you have a scopemeter, you could see if it was a steady voltage (bad, maybe shorted, or bad PCM) or a variable square-like waveform (good).

  7. #7
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    Ok thanks,

    I'll try to find a scope and see how it looks.


    Jan
    Jan Suhr
    Stockholm, Sweden
    1969 Camaro LS1/T56 Protouring Z/28
    www.protouring.se

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