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anyone know how2 "Bench Test' Throttle Position Sensor? 850 1995

posted by  Rockytop on  Mon Feb 16 03:58 CST 2009
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last visit: Tue May 10 13:59 CST 2011
[RELATED]

I have my Throttle Position Sensor off the car and need info on how to bench test it w/ a voltmeter. Anyone know the proper resistance values?
--
Two 1995 854 GLT's (w/ manual transmissions)








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    anyone know how2 "Bench Test' Throttle Position Sensor? 850 1995

    posted by  KlausC on  Mon Feb 16 06:20 CST 2009
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    1 & 3 (1)
    Idle .......................................... 900-1100
    Full Load .................................... 2300-2900
    (1) - Resistance is measured between these terminals.
    --
    My name is Klaus and I am a Volvoholic.








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      Fault Code & Ohms: Diagnose my Throttle Position Sensor / Switch 850 1995

      posted by  Rockytop on  Mon Feb 23 02:17 CST 2009
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      last visit: Tue May 10 13:59 CST 2011
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      Thanks again for the reference values. Here are the resistance values from my Throttle Position Sensor (Part # 0280122001 or 1336385):
      1278 ohms
      4000 ohms
      What do you think? Are those far enough off to indicate problem?

      > When performing OBD, Diagnostic Test Mode No. 2 (Function Testing), I get no Acknowledgment Code (should be 3-3-2) when throttle leaves idling position.
      > When throttle leaves full-load position, I get not the expected 3-3-3, but rather the 3-3-2 that should indicate idle position.

      > I get fault code 1-1-3 "HO2S Integrator Max Enrichment Limit" (Short term fuel trim lean) after idling 3-4 minutes; no fault code if I just drive.

      >>Throttle position switch toast? Any other cause for those symptoms?
      --
      Two 1995 854 GLT's (w/ manual transmissions)








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        Fault Code & Ohms: Diagnose my Throttle Position Sensor / Switch 850 1995

        posted by  KlausC on  Mon Feb 23 04:51 CST 2009
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        last visit: Fri Oct 24 10:15 CST 2014
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        Your resistance readings are on the high side indicating a possible sensor problem. But you didn't get a 4-1-1 so the ECU might be handling this situation.

        First: your 1-1-3 code. Check the air hose from the air filter to the throttle body for cracks or other leaks. Also check the vacuum tree for the same. Unmetered air coming into the intake manifold will give you this code.

        Now, the TPS. Your testing has me a little confused. The 3-3-2 only happens when the throttle is closed, idle. The 3-3-3 is at WOT. There is nothing between or when the throttle leaves either position.
        I would get the TPS squeeky clean and reinstall it and clean up the air leak before any more testing.
        --
        My name is Klaus and I am a Volvoholic.








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          Vacuum connections at Oil Separator, throttle position switch 850 1995

          posted by  Rockytop on  Tue Feb 24 13:44 CST 2009
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          RE: 1-1-3 code I can't find any vacuum leaks but I'm headed out again in a few minutes for another look-see. I can't eyeball from ANY angle or with ANY mirror angle the vacuum connections at Oil Separator. Might the intake manifold have to be removed to even inspect those connections? That would bug BIG time.

          How would I get a TPS "squeaky clean?" It appears to be hopelessly sealed, but if I decide to order new one, I might perform exploratory surgery.

          RE: the 3-3-2 code. With throttle closed, at idle, I got NO OBD code flashed. With WOT, I got the 3-3-2 code, not the expected 3-3-3 code (which never appeared at any throttle opening). That seemed to indicate a TPS problem?
          --
          Two 1995 854 GLT's (w/ manual transmissions)








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            Vacuum connections at Oil Separator, throttle position switch 850 1995

            posted by  KlausC on  Tue Feb 24 16:48 CST 2009
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            The lines coming out of the oil separator never seems to fail, the air from the engine fan seems to keep them fairly cool. What does fail early is the vacuum elbow behind the PS pump, very hard to see the line as it is covered with the intake port for #1. Also check the vacuum tree itself for cracks.

            I don't understand why the failure of the TPS to check itself out properly. The TPS does not have any bearing to the 1-1-3 fault. The long term trim is due to unmetered air entering the intake manifold.
            --
            My name is Klaus and I am a Volvoholic.








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              Vacuum connections at Oil Separator, throttle position switch 850 1995

              posted by  Rockytop on  Wed Feb 25 01:21 CST 2009
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              last visit: Tue May 10 13:59 CST 2011
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              I learned from this forum that my car (manual trans) doesn't have the infamous "hidden elbow" behind PS pump.

              How often does the intake manifold gasket fail enough to let through problematic amts of air?

              Would ignition problems (like a bad plug / rotor, etc) affect driveability at most speeds? Car drives 100% except at idle.

              I have a question about testing switches but think I should post a new thread . . .
              --
              Two 1995 854 GLT's (w/ manual transmissions)








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      anyone know how2 "Bench Test' Throttle Position Sensor? 850 1995

      posted by  Rockytop on  Mon Feb 16 07:31 CST 2009
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      last visit: Tue May 10 13:59 CST 2011
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      thanks so much, Klaus!
      Before I pitch it in trash, are you 100% certain that it's the same Throttle Position Sensor that my 850 has (Bosch # 0280122001, alternate part #1336385)? Are those #'s from a printed source or from your own measurements (I'd prefer the latter, given your experience)?
      --
      Two 1995 854 GLT's (w/ manual transmissions)








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        anyone know how2 "Bench Test' Throttle Position Sensor? 850 1995

        posted by  KlausC on  Mon Feb 16 07:38 CST 2009
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        last visit: Fri Oct 24 10:15 CST 2014
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        From a 1995 850 manual. Did you get codes about the TPS?

        Download your own copy of the manual:

        http://www.matthewsvolvosite.com/forums/viewtopic.php?f=1&t=8018
        --
        My name is Klaus and I am a Volvoholic.








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          anyone know how2 "Bench Test' Throttle Position Sensor? 850 1995

          posted by  Rockytop on  Mon Feb 16 10:21 CST 2009
          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
          last visit: Tue May 10 13:59 CST 2011
          [RELATED]

          awesome resource-- thanks!
          Do you recall what section had those resistance values and writeup on the Throttle Position Sensor? I looked for as long as I could and can't find it. If not, that's OK and thanks again--
          --
          Two 1995 854 GLT's (w/ manual transmissions)







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