Topic: no speedomter

[jdliggett]

i have a 92 4runner,just put in new motor.my speedometer doesn't work and every once in awhile my o/d off light flashes.i had a shop tell me it was a speed sensor, so i replaced the one in rear diff.still nothing.i had another shop tell me their was another one behind the speedo it's self,but i tore the dash apart and can't find any sensors in there.i'm already about 350.oo in the hole and still don't have a working speedo.anyone,help please,this is my first yota not very familular,thanks

[BigMike]

Wow.... Well, I think '92 was the crossover year from cable- to electric-driven speedometer.

Could you please look at your transfercase and tell me if you have a cable or wires attached to your speedometer drive?

This isn't really the best picture, but here is a Cable-driven speedometer gear on a Gear Drive t/case. Assuming you have an automatic, it will be in the similar location, near the rear output flange, but it will be a bit larger in diameter.

Let me know if it has a cable threaded onto it or if it has an electrical plug coming out of it.

[jdliggett [OP]]

thanks,i will look at it on break and let you know

[BigMike]

If it is a cable,

1) It needs to be attached.
2) The cable could be broken inside of the housing and you would need to get a replacement speedometer cable.
3) The previous installer may had jammed the cable sideways when it was last installed, and it could be grinding into the housing instead of spinning your speedometer.

If it is an electric drive,

1) Please make sure all connections are good.
2) There are three wires. You can use a Volt meter and an Ohms meter to test for: Red Wire: 12v with key in the ON position, Black wire: make sure the ground is grounded by checking that it has no resistance with any other metallic object nearby. For now don't worry about the white wire.
3) We have seen water or other elements damaging the electric sensor from the inside out. You might have a bad sensor. They are rather pricey to replace, at least $100 used.

[jdliggett [OP]]

thanks guys,it's eletric sensor,there's no cable.i will try to test it.does any body know exactly what this sensor is called,and if its bad will it make my O/D OFF light on my dash flash every once in a while,thanks

[79coyotefrg]

should be called  a vehicle speed sensor,

and im guessing,      yes  it would