I have a problem with the speedometer, as soon as you start the unit , the speedometer needle goes to 60 kms, and stays there, when you shut the motor off and tap the outer cover it goes back down to 0. I can not find a cable so I am guessing that it is electrical , and possibly a sensor from the transmission, I don't have the manual for the unit to check the troubleshooting side of things, can you please help me out here,.
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The speedometer in this truck is electronic, the needle is moved by a tiny electric motor called the speedometer needle stepper motor, a stepper motor is a DC motor than can hold one position rather than just rotate when power is applied to it. You will need to remove the instrument cluster from the truck and send it in to a Ford electronics repair center that repairs speedometers.
I have worked at a chevrolet dealer for 12 years and have probably replaced a few hundred of these clusters. the speedometer portion of the cluster always goes out, I have had very few speed sensors go out, and when they do the check engine light will come on and the trans. won't shift, if the new cluster is too expensive they are easy to replace if you just buy it outright, you can also get a wrecking yard cluster your miles just won't match
depends. newer vehicles do this just for effect, basically for you to go "ooooohhh" however with older vehicles ( pre 2006) this could be a code that the computer system is giving you, if the needle spikes all the way to the end of the speedometer/tachometer then back down to zero, its most likely effect. but if the needle spikes to 3 numbers (ex-90, 60, 30. then back to zero) its trying to tell you theres something wrong under the hood, could be as simple as a fuse or 02 sensor...
There is a vehicle speed sensor on top of the rear differential, this sensor is also for the anti-lock brakes. Sometimes you just remove it and clean it (it's magnetic) and may start working again otherwise you have to buy new. Yes, this sensor will affect the trany shifting.
A faulty vehicle speed sensor will cause this.
It's mounted on the back end of the transmission where the drive shaft slides into, near the top, it's just held in with a bolt, on the right side of the tranny, also has a wire connection.