Re: E30 AFM

[Jose Santana <mpower@xxxxxxxxxxxxxx>]

 Aaron,
 I think you have measured the resistance of the air temperature
 sensor, which is located inside the AFM. This is what I have
 measured on my AFM (E30 M3):

* Bosch 0 280 203 028.

* It has a 4-pin connector. Each pin has a number. They are (from=20
  left to right as you are looking at the connector): 4-3-2-1.
=20
* Resistance between 1 and 4 (R14)=3D 2k3 ohms at Ta=3D 22=BAcentigrades
 (This is the resistance of the air temperature sensor (ATS)).

* R34=3D 560 ohms.
 (This is the resistance of the whole "array" of resistors,it doesn't=20
  depend on the flap position)

* R24=3D 59.8 ohms with the flap closed
  (Here is where you get the variable resistance while you move the=20
   flap, using a part of the variable resistor).

* R23=3D 563 ohms with the flap closed
  (Idem, using the other part of the variable resistor).
 =20
* Note that the Pin #4 is shared by the ATS and the variable resistor, what=
=20
  makes me think that it is the "ground".    =20

Take them as a reference, not as a true. My M3 is not the best example
of good behaviour. If you are going to do the same measurements, please let=
=20
me know what happens. I need some references too. Thanks.
Jose Santana <mpower@domain.elided>
83' 316
88'  M3

------------------------------