Looking for DEFECTIVE solenoid pack for transmission, will buy it from you!

[jderou]

Sounds pretty stupid huh..
Anyway, I need a solenoid pack, but I only need it for the temperature sensor (see pic). This is for a 5R55N transmission. My sensor is damaged beyond recognition, so I cant get any specs off it.

Make sure yours has this:

 

[jderou]

Found one! thanks!

 

[kingtonghsp]

Looks like a regular ole resistor soldered on to the transmission to me. But what do I know...lol.

 

[joegr]

Looks like a regular ole resistor soldered on to the transmission to me. But what do I know...lol.

That's funny, it looks more like a diode to me.
(Diodes can be used to sense temperature, but so can resistors, if they are the right type.)

 

[pektel]

Oh yeah? Well to me it looks like an electronic thingamajig.

 

[kingtonghsp]

That's funny, it looks more like a diode to me.
(Diodes can be used to sense temperature, but so can resistors, if they are the right type.)

Your right, it looks more like a diode, with the clear plastic coating, rather than the solid brown plastic coating.

 

[kingtonghsp]

That's funny, it looks more like a diode to me.
(Diodes can be used to sense temperature, but so can resistors, if they are the right type.)

Your right, it looks more like a diode, with the clear plastic coating, rather than the solid brown plastic coating.

 

[Alax7]

I didn't know diodes could be used to sense temp.

 

[joegr]

I didn't know diodes could be used to sense temp.

The voltage drop across the diode changes in a linear fashion as the temperature around the diode changes. The amount of change and direction (increase or decrease in voltage as the temperature increases) depends on what particular diode you are using. The trick to it is to pass a constant (regulated) amount of current through the diode and then measure the voltage across the diode.

 

[REDBED]

I always thought the voltage drop across a foward biased semiconducter was 0.7V.

 

[joegr]

I always thought the voltage drop across a foward biased semiconducter was 0.7V.

It varies depending on what material is used, some are as low as 0.2V and others as high as 5 volts. It also varies with the amount of current flowing and with the temperature of the diode. Don't take my word for it, Google it.

 

[REDBED]

Doesnt a Thermistor vary its resistence with temp? Ive never run across a diode that either conducts or doesnt.

 

[joegr]

Doesnt a Thermistor vary its resistence with temp? Ive never run across a diode that either conducts or doesnt.

Yes, a thermistor does, in-fact all resistors vary resistance with temperature. It's just that thermistors have much more variance with temperature and do so in a more predictable way.


See below for more info on diodes as temperature sensors.
http://www.kennethkuhn.com/students/ee351/text/diode_characteristics.pdf