resistance range for CIS-E temp sender

[Ben Swann]

Jan,

Thanks, that's what I needed to know.  The used ones I have been fooling with are out of spec. each in the opposite direction.

Ben

On Tuesday, November 19, 2002 2:01 PM, Jpinkowish at aol.com [SMTP:Jpinkowish at aol.com] wrote:
> 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