Date: Wed, 29 Oct 2003 17:27:44 +0100
From: Michael Limpinsel <michael.limpinselnopsamcom>
Subject: Re: 9000 speedometer probs

Goran Larsson wrote: > In article <bnocj4$866$>, > Michael Limpinsel <> wrote: > > >>On–ly one problem is left: during the first couple of kilometers the >>speedometer works, then it begins to >>falter and finaly stops completely. > > > I have not heard of a speedometer failing in this way. Is it only > the speedometer that fails, or do the odometer, trip meter, and > cruise control also fail at the same time? > > In the 9000 of you cars age the speedometer consists of the following > parts: > > * A transducer mounted on the gearbox. The transducer is like a small > generator producing a voltage with a frequency proportional to the > speed of the car. The small gear inside the gearbox that drives the > transducer can fail, but I think that this type of failure should > be fatal, not working for some kilometers. The transducer can be > unscrewed from the gearbox and tested by spinning the input shaft. > The speedometer should react to this. > > * Wires between transducer and speedometer housing. > > * Circuit board inside speedometer housing containing an electronic > circuit that drives the speedometer dial, and a small stepper motor. > Also provides a signal for the DCC computer (if fitted) and cruise > control (if fitted). I had one 9000 '88 with a failing speedometer > caused by a bad solder connection on this circuit board. > > * A small stepper motor driving the odometer and trip meter. > Hi Goran! Thanks for Your quick help. Beneath the speedometer the trip meter (day and total) are gone when the instrument finaly fails. the consumption (l/100km) is counting increasing values (60l/100 km already:-))) I will first check the electric connections and perhaps try to unscrew the transducer from the gearbox for more tests. br michael

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