I want 2 know what the speed sensor does -2005 4x4 tacoma extra c

If the code for the crank sensor comes back, then there's still a fault in that circuit. Check for sensor resistance and wiring harness short or open. Crank sensor resistance should be 1,630 -2,740 ohms when cold. TPS would not cause those symptoms. IAC could cause rough idle but wouldn't affect higher RPMs. Bad coolant temp sensor could also be part of the problem. Bad sensor = ECM thinks engine is warmer than it is and provides too lean a mixture. But fix the crank sensor issue first since that affects the fuel injectors.

sounds like a bad wire either in the sensor cable or on a connector wifes van did some funky things and it was a bad sensor, also check to be sure there is no corasion on at the connector,

It is in the gear box and may be affected by a faulty TCM unit.. Run fault codes to be sure.

On the early Tacoma, the speed sensor is located in the cluster and is driven by a cable attached to the transmission.
Later models moved the sensor to the transmission tailshaft or transfer case and eliminated the cable.
If you do not have a speedometer cable, your sensor is on the transmission.

Test and check torque converter.

The speed sensor is located on the outside of the transmission case, it has a wire connector going to it. There are other sensors called turbine speed sensors and they are located inside the transmission. It all depends on what problem you have.

Well, since the transmission control module uses input from the vehicle speed sensor to know when to shift gears, and the speedometer also uses the signal from the vehicle speed sensor to know what speed to display on your instrument cluster, I would say that there is a pretty good chance that they are related.

what has most likely happened is that a fuse has blown that is in your blower fan circuit. Check your owners manual, and see if there is a fuse to that system, if there is, check and see if it is blown. If it isn't, then the problem could either be your blower fan itself, or your blower motor resistor. Generally, when the blower fan goes bad, no speeds of the fan work. When the Blower motor resistor goes bad, usually only 1 speed of the fan works. Try the first suggestion i gave, and it everything checks out in the fuse box, then try all of your fan speeds. If one works, you need a blower motor resistor, if none work, then it is most likely your fan. Let me know how it goes and i'll do my best to assist you further. good luck.

The part number I have is W0133-1750884, this is from partstrain.com.

Here is the link if you can use it.

http://www2.partstrain.com/store/index.php?VN=4294967261+4294967152+4294967119+&Nr=AND%28universal:0%29&N=0&Ntt=Speed%20Sensor

Good luck.