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grounded lambda sond test connector, oops! 200 1985

posted by  blue244 on  Mon Nov 17 14:59 CST 2008
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last visit: Fri Aug 5 17:02 CST 2011
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Not long ago I was trying to adjust the idle speed on my 240 and happened to ground the pink wire which is the lambda test lead. Recently, I noticed a post by Mr. Stickbuilder saying that if the pink lead was grounded the O2 sensor would be destroyed. I tested the O2 sensor today and got a reading that ranged between .82 and .85 volts. Not much fluctuation occured at all as I tried to create various vacuum leaks. The car was nice and warm for the test also. Did I ruin the O2? Has anyone else done the same to their car?








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    grounded lambda sond test connector, oops! [O2 vs ECU damage. Art?] 200 1985

    uid 18083's pic
    posted by  lucid on  Tue Nov 18 04:26 CST 2008
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    last visit: Fri Oct 24 12:31 CST 2014
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    "Not long ago I was trying to adjust the idle speed on my 240 and happened to ground the pink wire which is the lambda test lead. Recently, I noticed a post by Mr. Stickbuilder saying that if the pink lead was grounded the O2 sensor would be destroyed."

    I question that because the that pink wire goes directly to ECU 22. So I'd be more worried about that, than the O2 sensor.

    Maybe Art Benstein will see this and set us (me) straight.
    --
    Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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      grounded lambda sond test connector, oops! [O2 vs ECU damage. Art?] 200 1985

      uid 27's pic
      posted by  Art Benstein on  Tue Nov 18 15:00 CST 2008
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      Hi Bruce,

      You have a sharp memory. It has been some time since I posted that. You're right, it is nowhere near the lambda sond electrically. It won't damage the ECU or the test point either, as 22 is protected by a resistor that will safely limit the current.
      --
      Art Benstein near Baltimore

      You feel stuck with your debt if you can't budge it.








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        grounded lambda sond test connector, oops! [O2 vs ECU damage. Art?] 200 1985

        posted by  blue244 on  Tue Nov 18 16:10 CST 2008
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        last visit: Fri Aug 5 17:02 CST 2011
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        Thank you all very much. What do you think about those readings for the O2 sensor?








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    grounded lambda sond test connector, oops! 200 1985

    posted by  Stickbuilder on  Mon Nov 17 22:02 CST 2008
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    last visit: Fri Oct 24 03:31 CST 2014
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    You may not have killed it. There is always a danger of doing so when you ground the pink wire (according to Bentley). Maybe you got lucky.







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