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Paypal $5 to the next person who can measure resistance of the Coolant Temp Sender

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    Paypal $5 to the next person who can measure resistance of the Coolant Temp Sender

    I have the values for the temp sensor, which feeds output to ECM. I need resistance values for the temp sender for the temp gauge in the dash.
    Here are the terms of the deal...

    1. This is from a M20 motor only.
    2. I will need someone who owns or has access to a digital multi-meter with good batteries.
    3. I will need a few resistance measurements from the Coolant Temperature Sender, NOT the Coolant Temperature Sensor. The readings I need are from the brown or black sender with 1 single pin, NOT the sensor with two pins (blue sensor).
    4. I would like 3 measurements.
    5. Take photographs of all 3 measurements on the multi-meter and post them or email me.

    Connect positive test lead to chassis ground, probe single temp sender pin with negative test lead. Set multi-meter to resistance or OHMS.

    Process is simple, pull sender connector off, take measurement 1. Reconnect connector and warm your car a bit. Disconnect and take measurement 2. Reconnect connector, then bring your car to normal operating temp, then disconnect connector and take final measurement 3.


    Measurement 1: with engine cold (not running for several hours)
    Measurement 2: with coolant gauge 1/4 of full scale. Between "cold" and "normal temp" or "middle" of gauge. Can be approximate.
    Measurement 3: with engine at normal operating temperature. The temp gauge should be at 1/2 of the range.

    First person with this info will get $5 paypal'd to their account.

    Anyone with links from a credible source to verify this information from the internet can also get $5, no links to threads where people "guess" the resistance range. I really just need proof of actual specifications of the resistance range because it is not the same as the temp sensor for the ECM.

    Use this sender.


    Thank you for your participation.
    Owner - Bavarian Restoration
    BMW and European Electronics Repair and Restoration
    www.BavRest.com
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    #2
    I can tell you from my experiance with thermistors, measure it at room temperature(25C). That will tell you the thermistor value. Example 10K ohm:
    Then google for a table.
    I think it is probably actually a 1K as that is mote common. That is how I did it in college. Im sitting in my IX right now but dont have an ohmmeter on me otherwise id help you out.
    Short is in the red, open is in the blue IIRC.



    Edit:question, so normal operating temp is half of the gauge? Mine only ever goes to a 1/4. Soumds like my thermostat is shot.
    Last edited by canadiankid; 04-14-2012, 10:21 AM.

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      #3
      Naw my e30, e28, and e34 all have normal temperature at exactly half scale. I believe I've seen the Bentley manual state the temp should remain at the middle mark at all times.

      For your car, the problem might be thermostat related. I've heard a stuck thermostat will keep your temp at 1/4.
      Owner - Bavarian Restoration
      BMW and European Electronics Repair and Restoration
      www.BavRest.com
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        #4
        The problem is I suspect my sender is bad but it is fairly new. Less than a year old. Ill need comparison to know working sender.
        Owner - Bavarian Restoration
        BMW and European Electronics Repair and Restoration
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          #5
          Im actually going to replace mine when I get home to make sure my tstat is bad. Ill check the resistance and let you know.

          Comment


            #6
            sure, thanks
            Owner - Bavarian Restoration
            BMW and European Electronics Repair and Restoration
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              #7
              Meter set to 20k ohm I got .60 and .58 on two brand new sensors. Working at the shop today, might have time to check on a running car in a bit. There's 9 e30's here today, been busy :(
              john@m20guru.com
              Links:
              Transaction feedback: Here, here and here. Thanks :D

              Comment


                #8
                I can just record the labscope as a car warms up for you in if you like so you can see what the entire value is at any point, really that's the only way to verify that there aren't any dropouts in the curve anyway. ;)

                Comment


                  #9
                  Originally posted by bimmerteck View Post
                  I can just record the labscope as a car warms up for you in if you like so you can see what the entire value is at any point, really that's the only way to verify that there aren't any dropouts in the curve anyway. ;)
                  Yes that would be great as long as your are acquiring the gauge sensor, not the ECM sensor.
                  Owner - Bavarian Restoration
                  BMW and European Electronics Repair and Restoration
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                    #10
                    Originally posted by Gregs///M View Post
                    Yes that would be great as long as your are acquiring the gauge sensor, not the ECM sensor.
                    Brand new OEM gauge sensor results in an ice water bath heated to boiling. (I'll have to borrow a running m20 tomorrow)

                    Coolant temp(Fahrenheit) - Resistance in ohms.
                    33.2 = 2.1k
                    44.4 = 1.6k
                    54.0 = 1.57k
                    70.2 = 1.34k
                    90.1 =.76k
                    100.5 = .39k
                    111.5 = .31k
                    123.0 = .24k
                    130.5 = .21k
                    138.0 = .17k
                    148.0 = .15k
                    155.5 = .13k
                    166.5 = .11k
                    180.0 = .08k
                    189.0 = .7k
                    196.0 = 61
                    201.1 = 56
                    208.0 = 51
                    210.5 = 48

                    Comment


                      #11
                      Originally posted by bimmerteck View Post
                      Brand new OEM gauge sensor results in an ice water bath heated to boiling. (I'll have to borrow a running m20 tomorrow)

                      Coolant temp(Fahrenheit) - Resistance in ohms.
                      33.2 = 2.1k
                      44.4 = 1.6k
                      54.0 = 1.57k
                      70.2 = 1.34k
                      90.1 =.76k
                      100.5 = .39k
                      111.5 = .31k
                      123.0 = .24k
                      130.5 = .21k
                      138.0 = .17k
                      148.0 = .15k
                      155.5 = .13k
                      166.5 = .11k
                      180.0 = .08k
                      189.0 = .7k
                      196.0 = 61
                      201.1 = 56
                      208.0 = 51
                      210.5 = 48
                      Looks to be pretty accurate since the shop was about 80 degrees today and both sensors I measured were close to .6kohm.
                      john@m20guru.com
                      Links:
                      Transaction feedback: Here, here and here. Thanks :D

                      Comment


                        #12
                        Originally posted by bimmerteck View Post
                        Brand new OEM gauge sensor results in an ice water bath heated to boiling. (I'll have to borrow a running m20 tomorrow)

                        Coolant temp(Fahrenheit) - Resistance in ohms.
                        33.2 = 2.1k
                        44.4 = 1.6k
                        54.0 = 1.57k
                        70.2 = 1.34k
                        90.1 =.76k
                        100.5 = .39k
                        111.5 = .31k
                        123.0 = .24k
                        130.5 = .21k
                        138.0 = .17k
                        148.0 = .15k
                        155.5 = .13k
                        166.5 = .11k
                        180.0 = .08k
                        189.0 = .7k
                        196.0 = 61
                        201.1 = 56
                        208.0 = 51
                        210.5 = 48
                        Bimmerteck, send me your paypal as a reply or PM.
                        Owner - Bavarian Restoration
                        BMW and European Electronics Repair and Restoration
                        www.BavRest.com
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                          #13
                          Never seen one for the temp sender. but for the temp sensor, the values are well known since it's used all the time with MS.

                          these are the values I use:
                          -10c, 9300ohm
                          20c, 2500ohm
                          80c, 335ohm

                          I figure it might be useful to have both in one thread. :)
                          Build thread

                          Bimmerlabs

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                            #14
                            Originally posted by nando View Post
                            Never seen one for the temp sender. but for the temp sensor, the values are well known since it's used all the time with MS.

                            these are the values I use:
                            -10c, 9300ohm
                            20c, 2500ohm
                            80c, 335ohm

                            I figure it might be useful to have both in one thread. :)
                            similar to the M50's ECT sensor...and since its easy to get info on the ECT sensor...:)

                            http://www.bosch-motorsport.de/en-US...2782569739.pdf
                            Last edited by paperplane94; 04-17-2012, 09:26 PM.

                            Comment


                              #15
                              link didn't work :(
                              Build thread

                              Bimmerlabs

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