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Crank Position Sensor - Resistance Spec

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    #1

    Crank Position Sensor - Resistance Spec

    Bentley says it's supposed to be around 540ohms.

    I've gotten two brand new ones so far that have a reading of 900ohms on the money.

    Did some research and saw a few times where people mention it being a misprint in the Bentley and even one guy says he even spoke with bavauto and they told him the same thing.

    Can anyone shed some light on this?

    I will state that the one in my daily driven iX is reading out at 540ohms.
    clutchCTRL!
    Move with a purpose.
    - 1991 325iX 4dr/5spd
    - 1976 2002 SlickTop/2.7i M20/G260
    - 2000 323i AT
    2016 Mazda CX3 Sport AWD
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    #2
    Well, you don't say what car this is. An OE or OEM CPS for an M20B25 will ohm out at about 540 ohms and that resistance will change as you bring a ferrous object to the face of the sensor. I dunno about the those for an M20B27 (ETA).
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

    Comment

      #3
      The frustrating thing about reluctive sensors is that the ECU is looking for a certain minimum
      voltage from them. The impedance (resistance at dc) does matter somewhat for power
      transfer, BUT if they generate the voltage the way the ECU wants, they will usually work.

      What's so frustrating is that they will USUALLY work, but every so often you can trace
      a failure to them being wrong, especially if they're false- triggering from noise or ringing.
      And it's never the sort of thing that shows up easily...

      I've gone through this with several different types of these sensors, in various situations,
      and if there's no way to really look at what the interpretive circuitry's doing with the
      signal, it gets frustrating really quickly.

      (Did I mention that I find 'em frustrating? Both personally and professionally???)

      So really, that's a lotta words to say 'it'll probably work'

      hth

      t
      now, sometimes I just mess with people. It's more entertaining that way. george graves

      Comment

        #4
        I hear you Toby.

        The CPS I ordered was for a 90 BMW 325i - both times.
        clutchCTRL!
        Move with a purpose.
        - 1991 325iX 4dr/5spd
        - 1976 2002 SlickTop/2.7i M20/G260
        - 2000 323i AT
        2016 Mazda CX3 Sport AWD

        Comment

          #5
          Originally posted by kid325e View Post
          I hear you Toby.

          The CPS I ordered was for a 90 BMW 325i - both times.
          But was it an OE or OEM part?
          The car makes it possible, but the driver makes it happen.
          Jim Levie, Huntsville, AL

          Comment

            #6


            This is what I ordered!

            clutchCTRL!
            Move with a purpose.
            - 1991 325iX 4dr/5spd
            - 1976 2002 SlickTop/2.7i M20/G260
            - 2000 323i AT
            2016 Mazda CX3 Sport AWD

            Comment

              #7
              Originally posted by kid325e View Post


              This is what I ordered!

              The one i ordered from the dealer came in a different packaging. Only paid 70$ for it. I think that is an OE.

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                #8
                FYI "Vemo" is not OEM.

                From what I read when I was getting wacky readings on mine, was that the non-OEM ones (Vemo and the like on Amazon/Rock Auto) have more problems and most of the time don't work correctly. It sounds like OEM is the only way to go. I bit the bullet and bought the OEM one for around $80 and fixed my random hot start (and sometimes misfiring issues) on my '89 m20.
                555Garage - Kingston, PA

                '13 BMW e70 X5 35d
                '95 BMW e34 525i
                '92 BMW e30 325i S52 Vert (Quade the Vert)
                '92 Range Rover Classic
                '90 Range Rover Classic
                '89 BMW e30 325i Coupe (The DIRTY30)
                '81 VW MK1 Rabbit Caddy Diesel
                '76 Honda CB550K Cafe/Brat
                '67 Pontiac LeMans
                '24 Model T Depot Hack
                ....And a bunch of Motobecane, Puch, Garelli, Batavus and Honda 49cc-78cc Mopeds...

                Comment

                  #9
                  I resurrect this three cause my 91 325ix won't start. Cps read 850 ohms at the dme. Is there an adjustment to be made or a new one is only option?

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