Koitin etsiä onko tätä aihetta jo olemassa, enkä mielestäni löytänyt sopivaa, joten aloitan uuden.
Ongelma on 850 (1995 t5r) nopeusmittari näyttää väärin (n. 10 km/h liian vähän), ja neula lisäksi pysähtyy 90 km/h kohdalle.
Trippi- ja matkamittarit rullaavat kilometrejä ongelmitta ja oikein - tässä vertailukohtana navigaattorin ilmoittamat matkat.
Netistä löysin tuon alla olevan kertomuksen.
Onkos kellään tähän liittyen varmistavaa tietoa - suuntaan tai toiseen?
I just wanted to let everyone know that I finally figured out what was wrong with my 850's speedometer (working sometimes and not working other times). A very smart Volvo mechanic finally told me it was the ABS unit. I thought he was pulling my leg, but I contacted WWW.AUTOECU.COM, and they verified that the ABS unit would definitely cause the speedometer to work erratically (speedometer sensor wiring runs through the ABS module). I removed the electronics portion of the ABS (also found out you can take this part off and drive fine - no brake fluid loss or anything - brakes still work, just no ABS - until it's reinstalled) and sent it to WWW.AUTOECU.COM. They rebuilt the module, updated it, and fixed any potential problems. They were great. I had it back in a few days, and it fixed the problem just like they said it would. BTW - the electronics part of the ABS isn't so bad to take off, but you do need a small reverse Torx socket to take out the 4 screw/bolts. The wiring just unplugs. If the screws were easier to get to it would be super easy. I did have to remove the air filter to get to these 4 module mounting screws. Anyway, just wanted to let anyone know that's having erratic speedometer problems, it could be your ABS - especially on a 1997 Volvo 850. I searched for months, replaced parts, and couldn't find any info on it anywhere on-line - certainly not this solution. Just thought someone should share the info!