If a person recently changed the speed sensor in a 1990 Dodge B-250 Van and the trip meter and odometer do not work, there could be a fuse that needs to be replaced. The computer might also have to be reset to allow for the odometer and trip meter to work.
Speedometer is ran by electronic sensor on rear end. Odometer is ran from speedometer. If both don't work problem is sensor. If speedometer works sensor is okay. If speedometer works and odometer does not problem is in mechanical parts (gears) of of odometer and has to be replaced. Can get used from eBay (search for speedometer or odometer, is one unit) or take to dealer.
If the speedometer and odometer are both not working, I would blame the speed sensor. If only the speedometer does not work and the odometer does work, the cluster is bad.
Does your odometer work? If the speed sensor goes faulty both speedometer and odometer stop working.
There is no such thing as an "odometer sensor." There is a vehicle speed sensor that is located on the output shaft housing of the transmission. That sends info to the speedometer. From there, the speedometer and the odometer are both operated internally, so if your speedo is working, but the odometer isn't, you have a problem inside the speedo head assembly.
If the speedometer is not working but the odometer is, I would suspect the dash cluster is at fault. If both speedometer and odometer are not working I would suspect the speed sensor on the transmission is at fault.
The speedometer/ odometer signals come from the ABS sensors. There is a sensor at each wheel bearing.
check the fuse, the speedometer does not run off of a fuse
Stepper motor for speedometer has a broken gear in it, causing unpredictable operation. If the odometer is still working, then the speed sensor is OK. Instrument cluster needs repair.
When those things on my 92 B250 did not work, I replaced the speed sensor located on the transmission tailshaft and that fixed the problems. Hope that helped! Mark When the speedometer and odometer did not work in my 1990 B250, I had to replace the speed sensor, instrument cluster (speedometer) and replace a tiny gear (odometer) in order to get them working properly
If both the speedometer and odometer are not working I would suspect the VSS (Vehicle Speed Sensor) is at fault. If the speedometer doesn't work and the odometer does, I would suspect the instrument cluster is at fault.
The odometer runs on the same electronic gear driven sensor as the speedometer so if the speedometer is working and the odometer is not the problem is in the "Speed head" (speedometer unit in the dash). Mine and several others I have seen break at about 40,000 and will need replacing.
the speed sensor is located on the side of the transmission, there is no physical cable like the older cars, the speedometer and sensor are electronic. If the speedometer is working and showing speed traveled but the trip meter (odometer) is not working, the speedometer itself is faulty, is the speedometer is not showing speed travel and the odometer is not logging miles travel, then most likely the speed sensor is dead.