We have a recent problem with the speedometer on our 2004 4x4 Tacoma (double cab), automatic transmission. The speedometer fluctuates wildly. Sometimes it seems to jump 10 - 20 mph around a particular value - say 80 mph could be the center and it would drop to 60 and up to a 100 several times within 10 seconds, then drop to zero for a while and then start the swinging all over again. But the pattern is not predictable.
This truck's speedometer system is completely electronic - no cable. A local garage spent several hours trying different sensors, replacing the gear wheel within the sensor area near the output shaft, etc. Nothing seemed to make a difference. When the problem started we had an electronic speedometer correction device in the system that had worked fine for 4 years. I've removed that from the system and the erratic behavior persists (although the range of fluctuations is higher as you'd expect since we have 4.88 differential gearing).
Anyone ever have a similar problem? Did you solve it?
Thanks in advance,
Howard
This truck's speedometer system is completely electronic - no cable. A local garage spent several hours trying different sensors, replacing the gear wheel within the sensor area near the output shaft, etc. Nothing seemed to make a difference. When the problem started we had an electronic speedometer correction device in the system that had worked fine for 4 years. I've removed that from the system and the erratic behavior persists (although the range of fluctuations is higher as you'd expect since we have 4.88 differential gearing).
Anyone ever have a similar problem? Did you solve it?
Thanks in advance,
Howard