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Disconnecting any sensor will cause a non working car to work suddenly.I would check two things. 1. The Transmission control module- vary rare issue. 2. the ignition control module. These break down a lot in Honda's. In the 96-98 model of the civic, the dash uses the tach built into the ignition control module. the 99-00 model doesn't use the ICM tach signal, but uses the same module. Test your ICM with a digital multi meter ($5 @ harbor frieght), before dropping $60- 140 on one.
I would say its probably a short or a ground problem at the turn switch or a wire in that area. you need a test light and probably a multi meater and some nohow a ground or wireing problem can even drive a master teck crasy.
If both the speedometer and Tach quit working there is a high probability that the instrument cluster has checked out. The speedometer takes it's signal from the VSS (vehicle speed sensor) via the computer, and the tach comes from either the distributor or coils (tach pin) to the tachometer. Both these items would have to go out to cause your symptoms.
Possible faulty ignition module. Tach output is in ignition module. Module located under coil pack. Remove and have tested at any major parts distributor for free.
COULD BE GROUND PROBLEMS OR THE TACH GOING BAD.EVEN THOUGH CAR SEEMS TO BE RUNNING GOOD IDLING GOOD.SOME TIMES A SPARK PLUG MISFIRE.CAUSING A LITTLE ROUGH IDLING CAUSING TACH NEEDLE TO GO CRAZY.I SEEN ALTERNATOR WITH VOLTAGE REGULATOR GOING BAD CAUSE A POWER SURGE CAUSING HEAD LIGHTS TO DIM A LITTLE THEN BRIGHT WHILE ENGINE IDLING.THIS WILL CAUSE TACH METER NEEDLE BOUNCE AROUND ALSO.
I know with the generation II caravan the Body Control Module had some strange problems. On mine the horn will not work, and the wipers work sometimes and eerily on their own. It is a known problem and there is a TSB about it.
There are 2 sensors on the engine that sent a signal to the computor and speedometer and tach. When one of these goes bad it can make the speedometer and tach go all over the place and also just stop working. This can also cause all types of engine running problems because the information being sent to the PCM will be incorrect all so. The units are easy to replace once you find them, it seems that they are located in different areas of the engine with each year the vehicle was put out.
Had same problem, so I brought it to the dealership. They said there mechanic cleaned the contacts/leads on the console cluster, Speedo or tach have not failed since. It's been about 6 weeks so far!
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