THE SPEEDOMETER QUIT WORKING AND IT'S MESSING WITH THE TRANSMISSION.
1991 Toyota Previa
September, 6, 2012 AT 12:20 AM
After a long haul pulling a car and trailer my speedometer quit working. It seems to be messing up the transmission on highway speeds telling it to shift gears when it shouldn't be. My job relies on this vehicle and would like to attempt to fix it myself if you have any advice. I can't get in to see a mechanic right away and I'm scared I'm going to either break down or get pulled over because I don't know how how fast I'm going!
Japanese makes comes with a flash code retrieval for pre-OBD-II models.
Most modern scan tools comes with adapters for code retrieval for these but some are not compatabile as the ECM/PCM are not designed for scan tools as they are like those with sight windows which don't have any scan tool plugs.