no such thing
On the engine block, near the thermostat housing.
Theres a speed control sensor on the transmission which went on my 1992 they replaced it and now its fine.
There is a crankshaft position sensor that measures how fast it rotates
I have a 1990 prelude that is in the dealership as I write this to have the speed sensor replaced. I have just been told that it is on the transmition. It is a sensor.
oN THE 91 FORD CROWN VICTORIA YOU WILL LOCATE THE SPEED SENSOR ON THE DRIVERS SIDE OF THE TRANSMISSION ON THE TAIL SHAFT.
it's located in the rear of the transfer case
on top of the valve body inside the transmission
The speed sensor on a 90 lumina 3.1 should be on the drivers side top of the tranny, below the steering rod. Sould be a screw in sensor with wires attached.
E30 means the Idle Speed Control motor rpm is out of range, E31 is a shorted MAP sensor circuit. They are probably both related to a bad MAP sensor so replace it first.
the speed sensor is on the transmission right behind the manifold- It has two 10mm bolts and a small harness sitting on top of it.
The function of an air control sensor of a 4.3 1991 S10 is to determine the amount of air that the idle air valve allows to pass trough it and bypasses the throttle plate.
It is an electric speedo so it can be the speed sensor or in the speedo itself.