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P1637

This is a discussion on P1637 within the General Help forums, part of the LSx Technical Help Section category; So I took my car (2000 z28)to get inspected and unfortunately it failed. When I brought it home I ran ...

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    P1637

    So I took my car (2000 z28)to get inspected and unfortunately it failed. When I brought it home I ran the scanner and that's what it hit me with. P1637- L terminal circuit. I remember scanning it a while ago (few months, it's been sitting) and it had no problems. It drives fine, and the voltage stays constant. Things to note: I did just install some longtubes on it, as well as a full 3in exhaust. Has cats and O2 sensors and all, and I'm not getting any codes from those. Any help would be appreciated

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    Spaz is My Mentor SMWS6TA's Avatar
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    P1637

    check the connector on the alternator. there's a single thin wire that talks to the ecm. it can break easy.
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    So update. I finally got some time to take a peek under the car, and from what I can tell the alternator looks fine. The guage shows that it's charging and all, so I'll probably end up going to grab my test kit to check everything. On a side note, I found this connector dangling, and I honestly have no clue what it might go to. Any help would be appreciated

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    Spaz is My Mentor SMWS6TA's Avatar
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    what side of the bay is that on? hard to tell from pics.

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    Quote Originally Posted by SMWS6TA View Post
    what side of the bay is that on? hard to tell from pics.
    Driver's side engine bay, its underneath the ABS module, but everywhere I've looked I couldn't find what it hooks up to. I think I might have to do with ABS as I have an ABS inop light

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    Spaz is My Mentor SMWS6TA's Avatar
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    Most likely that, I think the air pump had only a 2 wire connector. So I don't think it's that and it doesn't look like it's for the O2 sensor harness either.

    Why would your ABS be disconnected?

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    If your P1637 code persists, I would unplug and inspect your connections (both the harness end and alternator terminal) for corrosion or damage. Also take a look to ensure that your engine grounds are in place, free of corrosion and tight. The hidden ground is bolted to the back of the driver side head.

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