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Ville bara kolla om andra har samma problem och om det är vanligt förekommande? I always bring money by the bucketload 2 local stealership so I believe EVERYthing they ever tell me |
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hej är den altid 20 meter fel? eller kan de var rätt ibland? Noah Noah Brown |
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The wheel sensor in use by the Mk3 or Mk4 nav system is the front left wheel. The Mk1 and Mk2 use both front left and front right wheels. To test, you could disconnect the speed pulse from the nav unit and drive without it for a while. Then you force the nav to use GPS alone, instead of GPS + Dead Reckoning. Or - if you have a Mk3 or Mk4, and the factory wiring loom, you will have both left and right wheel signals at the nav connector, but be using only the left wheel. So you could swap the left and right signals and see if the problem goes away. Wheel sensor readings are directly proportional to road speed. If your speed readings change a lot when the vahilce speed is constant, then you either have a bad wire connection, or a poor pulse waveform. The nav system automatically calibrates the wheel speed against GPS-calculated speed, so if you have drastically changing speed pulses then the calibration will be stuffed up and positional errors will defintely result. The nav wheel pulses are processed and output by the ABS unit, so if the waveform is bad the ABS unit might be generating bad waveforms. You'd need to observe this on an oscilloscope to verify. If you had a bad wheel speed sensor, then maybe the ABS would be showing errors (maybe as I'm not sure) A diagnostic check would confirm. Otherwise, if the waveforms are fine, then it may be the nav input stages which are defect. A new nav unit would confirm this. Noah Noah Brown |
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The thing is that i've already changed my Nav unit from an MK3-->MK4, so for the problem to persist there must me some other factor than the recpeption. I think that you might be on to something here because when I go to the menu "sensor check" I see that the wheel sensor is always showing negative figures witch implies that its going backwards, or I could be wrong here? But It's like you said the marginal error isn't consistant it "only" happens in certain areas like in the city and around the city? Do you think I should disconnect the wheel sensor and go on w/o it for a while to check? I always bring money by the bucketload 2 local stealership so I believe EVERYthing they ever tell me |
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| wille: Hjälpte det med ny GPS mottagare för dig? | |
| Har inte testat ännu | |
| Ny GPS antenn fixade mitt problem... | |
| Kom på att min oxå visar 20m fel.....men just nu är jag bara glad att den fungerar så det är inget som stör mig än. | |
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Men hur exakt ska de vara då? Och hur vet ni att det slår på 20m? |
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Vet inte hur exakt det ska vara....20m kan jag ta som felmarginal även fast den borde vara något mindre. Står man mitt i korsningen så står det att det är 20m kvar på skärmen. |
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Min oxå! Man blir smått irriterad! I en sväng så kan markören få fnatt och komma in på fel område. Ska man lära isg o. leva med detta eller går det o. fixa? I always bring money by the bucketload 2 local stealership so I believe EVERYthing they ever tell me |
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