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RE: [T3] Temp Sensors

On 6 Nov 2001, at 8:20, JSmith3@SARCOM.COM wrote:

> >>>>>>>>>>You can test it using the Bentley as a guide, or just put an 
> Ohmmeter across it. What do you get when you do this?
> >>>>>>>>>>>>
> I tested both sensors and could not get a consistant reading, meaning there was
> a slight variation with each reading, but not by much.  The head temp was
> incorrect cold, at approx. 3500ohms (X100 scale, disconnected, should be 2500)
> and it was also incorrect connected with key on. 

The difference between 3500 and 2500 Ohms is probably not significant. It's 
more likely due to differences in the temp when you took the readings.

Ohmmeter readings are only meaningful with no external power applied to 
the part, so key ON or OFF does not come into the picture. You should just 
disconnect the sensor from the FI harness and measure the resistance thru 
the sensor.

> The top sensor was also
> reading incorrectly, but I tried so many times, now that I am writing this I
> forget the final reading, but it was not correct. I think it was 3.5- 5 ohms and
> it should be 1.5 to 2.5. And following the info at the D- jetronic site
> http://www.geocities.com/MotorCity/Shop/4123/StrtStop.html seems to indicate
> this is a possibility.  When the sensor is connected, the engine starts then
> stalls immediately.  ??????

I don't remember the exact "correct" values for these, but I think it should be 
more like 200-300 Ohms. Let's both double-check our memories tonight. If it 
is supposed to be 200-300 but reads 2-3 then it is shorted and you need a 
new one, as you first suspected.

Jim Adney
Madison, WI 53711-3054

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