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Ok....need help asap!

This is a discussion on Ok....need help asap! within the General Help forums, part of the LSx Technical Help Section category; did you check for power at the relay harness?remove relay ,turn key on ,use test light and check all sockets ...

  1. #21
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    red
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    did you check for power at the relay harness?remove relay ,turn key on ,use test light and check all sockets of the relay harness.is the battery cables tight?

  2. #22
    Senior Member JayTA98's Avatar
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    1998 Trans Am

    when you said that you hard wire the pump, did actually run it with some wiring straight to it or did you pulled the relay out and put a small piece of wire to overide the relay? You need to start checking for power at the relay socket 1st to make sure it's getting power. If the pump works with the small jumper at the relay socket then the realy is bad or the wire that sends the power signal to it is open somewhere.

  3. #23
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
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    I have a feeling the no communication with the PCM with your scan tool and the non running fuel pump are related since the PCM controls the fuel pump relay. It seems like the PCM isn't getting either power or ground to wake up.
    The Service Vehicle light also supports this because one the things that triggers that is loss of communication between the IPC and another module (ie PCM).
    Refer to the schematic I posted earlier and check for power at those fuses. I know you said the fuse themselves are ok, but I wanna know if there is voltage at those fuses.

    Post the results and we'll go from there.

  4. #24
    Honor-Courage-Commitment SajoR's Avatar
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    Ok guys I'll go ahead and check these things while I wait for my friend to get here with hos HP Tuners to data log and I'll be able to determine where there is communication and where there isn't.

    JayTA98, I hard-wired it directly to the pump, so ill try jumping it with a wire at the relat switch also before my friend gets here.

  5. #25
    Senior Member JayTA98's Avatar
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    ok bud. Good luck. Keep us posted.

  6. #26
    Honor-Courage-Commitment SajoR's Avatar
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    navy blue metallic
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    Ok guys here's the update.

    Just spent the last 3 hours with my friends trying to figure out wtf is going on. We've come up empty and Cutlass, you're the only one who has come closest to helping us out. So hopefully, you can continue that streak.

    So friend plugged HP Tuners in and had the same problem. We're getting power to the connection there, but it is unable to connect, just like my OBD II.

    We are getting power through the fuses in both fuse boxes but apparently somewhere between the fuses and the PCM, power is being lost since we cannot communicate with the PCM with anything.

    We think that there has to be a short somewhere between the fuse and the PCM, since apparently the PCM won't wake up, like Cutlass said. So tomorrow we're going to try and trace the wiring and see if we find anything.

    Let me know if you have any other advice or where to go from here.

  7. #27
    Veteran 0rion's Avatar
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    have you pulled the connectors off the pcm and checked the pins for corrosion?

  8. #28
    Honor-Courage-Commitment SajoR's Avatar
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    navy blue metallic
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    yes....we pulled the pcm and pins were corrosion free and looked fine.

    we plugged in another pcm that my friend had from another ls1 to see if that would read in case it was my pcm that had gone out but we had the same problem.

    so the problem lies somewhere in between the pcm and the fuse boxes in the engine bay

  9. #29
    Moderator Cutlass's Avatar
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    From the schematic I posted earlier, both the battery positive wires go through connector C101. That connector is a 10 terminal connector that runs over the passenger side wheel well. The fuel pump relay control also runs through that connector FWIW.

  10. #30
    Moderator Cutlass's Avatar
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    If you end up finding that the PCM does have power and ground but just isn't communicating with anything else, there is a connector to check for that. Its connector C230. Its a 10 terminal connector inside the car located under the passenger side of the IP, behind the knee bolster.

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