AnswerID: 212933 Submitted: Tuesday, Jan 02, 2007 at 20:37
obee
replied:
Hi Chris
Sounds like you have an electronic speedo if tapping it gets a result. Just like my monitor that goes out of sync until I slap it a few times.
The sensor is not in the dash obviously, because it will be a Hall Effect device that responds to something revolving like the output shaft on the gearbox. I like it when you ring up the "experts" and they say "maybe it's....".
If you are mechanically inclined you could take the dash apart and use some electrical contact cleaner on the plugs behind the instrument panel and visually inspect them for signs of not so clean where the contacts are. Trying a borrowed speedo that we know is working would tell us something of course but difficulties aquiring one is a prob.
Nothing else I can think of apart from trying an auto sparky who would make more sense than Toyota lackies. Look for someone who is old enough to aquire experience but not so old as to have gone shell shock when they introduced all this electronic stuff that no one really wants. (just kidding)
Oh, taking a look at the wiring and connector at the sensor end might discover something but I think that shock treat that you have used to get it to respond tells me otherwise.
An electronics teacher once told me that ninety per cent of electronic problems are actually mechanical like connections and bad solder joints so we live in hope.
I only recently fixed a noisy speedo in my hilux by pouring penetrating oil down the cable and into the hub on the back of the speedo. I feel good now knowing I dont have electronic version.
Sorry I cant be on any further assistance. Just an amateur here is me.
Owen
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