Date: Wed, 29 Oct 2003 13:52:48 GMT From: hohnopsamlid.invalid (Goran Larsson) Subject: Re: 9000 speedometer probs
In article <bnocj4$866$1nopsam1.wdf.sap-ag.de>, Michael Limpinsel <michael.limpinselnopsamarkets.com> 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. -- G–ran Larsson http://www.nospam.com/saab/
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