resistance range for CIS-E temp sender

[Jpinkowish at aol.com]

In a message dated 11/18/02 8:24:43 PM EST, bswann at worldnet.att.net writes:

> there is the
>  temperature sensor or fuel injection sending unit located on the bottom of
>  the cooling neck of CIS-E for 5 cyl.  It is(AFAIK) a negative coefficient
>  thermal resistance sending unit used by the ECU for mixture control.

>  I found that Rod at thepartsconection.com has them for a very reasonable
>  price.  Bosch Part number -0 280 130 037/ VW 035 919 369 (M).  I would have
>  replaced with a new one earlier but dealer cost was over $100.
>
>  Now that testing them is almost a mute point, anyone have a resistance
>  range for these, or a value at ambient temp?

Hi Ben,
Resistance for the temp sender is ~2.5k ohms for 68 degF(20 degC) and cooler.
 It drops to ~600 ohms when engine is warmed(85 degC).  The change is not
linear, but that's neither here nor there.  The important thing is that the
resistance change and eventually settle in around 600 ohms.

This is actual data from my measuring a new Bosch sensor.

If the sensor fails at high resistance(in my case, it sat at 5,5k ohms), the
car warms up fine and then continues to run rich.  In my case. mileage
dropped to 17 mpg.

If the sensor fails low, warm up is rough and long, as the engine is starved
for fuel at lower warm up temps.

HTH

Jan Pinkowish
'85 4ksq
Bristol, CT