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Throttle position switch? 850

posted by  B.B. on  Mon Sep 13 11:03 CST 2010
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last visit: Mon Oct 6 13:15 CST 2014
[RELATED]

Where is the switch that tells the ECU your foot is off the gas?

I think I've fixed the vacuum leaks, but there's still some high idle rpm
so I guess there's a key adjustment out of whack.

Bill







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    Throttle position switch? 850

    posted by  someone claiming to be fixit2002 on  Wed Sep 15 01:35 CST 2010 [RELATED]

    Try disconnecting the battery for 10-15 minutes to reset the fuel table (LTFT)settings. The idle will initially seem rough at first but should settle out after a little driving and the LTFT data is reset.








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      Throttle position switch? 850

      posted by  B.B. on  Wed Sep 15 12:48 CST 2010
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      last visit: Mon Oct 6 13:15 CST 2014
      [RELATED]

      Today I replaced the upper and lower radiator hoses.
      I looked at the throttle drum adjustment and had to shorten up
      the link a tad to get the throttle drum to seat fully.
      I couldn't hear any clicking from the throttle switch at all.
      Also I found a nasty split in one of the vacuum lines that I replaced
      the other day, ach! it was crappy rubber.
      So I got some new vacuum line at the Volvo dealer and Bingo the idle
      seems fine and the check engine light stays off.
      Maybe the throttle position switch was never showing foot off the gas?
      So tomorrows plan will be fill the tank and check mileage with the idle
      behaving better.

      Do you still think it's a good idea to do the ECU reset?

      Thanks, Bill








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        Throttle position switch? 850

        posted by  KlausC on  Fri Sep 17 05:41 CST 2010
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        last visit: Fri Oct 24 10:15 CST 2014
        [RELATED]

        ECU reset is not relevant in this situation. You found the vacuum leak and that fixed the problem.

        Best thing to do is go through all of the A & B connectors and erase all of the codes. This will give you a base to operate from. B-2 122 does not erase.

        Klaus







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        Throttle position switch? 850

        posted by  mbliss on  Thu Sep 16 08:25 CST 2010
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        last visit: Tue Oct 21 20:49 CST 2014
        [RELATED]

        On the 240s, the Throttle Position Switch was just a microswitch positioned so it would click when the throttle just came off idle. If I remember correctly, on the 850 the TPS is a throttle position SENSOR that sends more than just off/on to the ECU. So no "click" to hear when you move the throttle.

        --
        '96 850 and '83 244 DL both at about 200K; gone but not forgotten '81 245 and '64 Amazon








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          Throttle position switch? 850

          posted by  B.B. on  Thu Sep 16 10:38 CST 2010
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          last visit: Mon Oct 6 13:15 CST 2014
          [RELATED]

          I found the switch on the bottom of the throttle body as you said.
          I found some fuzzy adjustment detail in my Haynes manual.

          It has to go with the throttle drum seating and the linkage hitting an
          adjustment screw (Seems to be the throttle plate stop)

          Is there Volvo adjustment info for this stuff? Mine is a 95 850 NA.

          I reset the ECU but no joy, the check engine light is still unhappy.

          Thanks, Bill







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            Throttle position switch? 850 1995

            posted by  HO on  Fri Sep 17 01:55 CST 2010
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            last visit: Tue Aug 12 14:01 CST 2014
            [RELATED]

            I replaced mine last year, no adjustment is needed - plain and simple.
            --
            1995 855 NA, Bilstein Strut & Shocks, Volvo Protective Grill, K&N Filter, E-Code Lens, ClearCorner Light, Alpine CD-Changer, AutoDim RearView Mirror, 6000K HID








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            Throttle position switch? 850

            posted by  mbliss on  Thu Sep 16 13:32 CST 2010
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            last visit: Tue Oct 21 20:49 CST 2014
            [RELATED]

            Unless you really disassemble things, you probably shouldn't need to mess with the mounting described in Haynes. What are the codes you're getting?

            --
            '96 850 and '83 244 DL both at about 200K; gone but not forgotten '81 245 and '64 Amazon








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              Throttle position switch? 850

              posted by  B.B. on  Fri Sep 17 06:21 CST 2010
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              last visit: Mon Oct 6 13:15 CST 2014
              [RELATED]

              I get A2 codes: 154, EGR leakage and 443, 3 way cat effiency

              The idle is intermittant high. I thought it was fixed the other day
              when I found a split end on a vacuum hose in the EVAP circuit.
              The engine RPM behaved for a few hours then back to throwing codes.







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                EGR valve leaking 850

                posted by  KlausC on  Fri Sep 17 09:08 CST 2010
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                last visit: Fri Oct 24 10:15 CST 2014
                [RELATED]

                The EGR valve is not closing all the way due to crud. This will also effect your idle. Time to pull it off again and clean it some more.

                The other code is just a warning.

                Klaus







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                Throttle position switch? 850

                posted by  mbliss on  Fri Sep 17 08:41 CST 2010
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                last visit: Tue Oct 21 20:49 CST 2014
                [RELATED]

                Fortunately for me, I don't know anything about EGR valves, but assuming you did clear the codes and this is what came back, sounds like you need to verify the EGR lines are all tight and double check your vacuum lines. The 443 is probably secondary to whatever else is wrong.

                --
                '96 850 and '83 244 DL both at about 200K; gone but not forgotten '81 245 and '64 Amazon








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        Throttle position switch? 850

        posted by  jadnhm on  Thu Sep 16 01:41 CST 2010
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        last visit: Tue May 22 18:03 CST 2012
        [RELATED]

        Have your radio code handy, and a clock so you can reset the time, but definitely do the ECU reset to zero out the fuel trim. I really hope this fixes your problems! Good sleuthing!
        --
        1998 V70 AWD->FWD Turbo 200k+








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          Throttle position switch? 850

          posted by  B.B. on  Thu Sep 16 10:44 CST 2010
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          last visit: Mon Oct 6 13:15 CST 2014
          [RELATED]

          I reset the ECU this morning, but the ECU started throwing codes again.
          I'm back in the head scratching mode.

          Bill







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    Throttle position switch? 850

    posted by  mbliss on  Tue Sep 14 08:33 CST 2010
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    last visit: Tue Oct 21 20:49 CST 2014
    [RELATED]

    TPS is attached to the throttle body, but your problem may be a dirty Idle Air Control valve or the throttle body itself. Also check the electrical connectors for same.

    --
    '96 850 and '83 244 DL both at about 200K; gone but not forgotten '81 245 and '64 Amazon







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