The most common reason believe it or not is the seat belt contorl unit in the center console right below the park brake.....People spill coffee on it and other liquids and cause it to fault. This is assuming you have the old style with Auto shoulder belts...
The main reason that a speedometer and odometer will stop is because the speed sensor, located on the back top area of the transmission, has gone faulty. The part can be had very easily at any auto parts store, or junkyard. The reason the check engine light is on is because the speed sensor signal goes thru the ECM (computer) for the car to run the different things. If the signal is intermitent, or interupted, the light is set, as well as the speedo and odometer not working.Another reason is that the ECM it's self is bad, you can locate the ECM behind the glovebox and give it a few knocks while the car is running, if your engine responds by cutting out (even just a little) then replace it. they are around $110.Since there is no speedo cable, it must be an electrical issue with a sensor.QuestionWhy is there no speedometer cable? Does it have digital gauges?The reason I ask, is, when I first got my 1986 Celebrity, the speedometer and odometer did not work. The previous owner had bought a new speed sensor, but had not had it put in yet. I installed it first thing. no luck. In checking the speedometer cable, I found it was broken, (the end of the cable at the tans-axle). After I replaced the speedometer cable, it worked fine.Now, I cannot imaging gm did away with speedometer cables in the two years before the 1988 came out. I do have a 1990 S-15 with digital gauges, and I know it does not have a speedometer cable. But, the 1990 Sunbird I used to own, with analog gauges, did have one.
The Chassis is the ground.
The cable is manual drive on a 1991.It plugs directly in the back of the speedometer.
locate fuel pump wiring in 2003 Saturn L200
The speedometer signal comes from the abs computer via the rear axle speed sensor.
It sounds as though your sensor is on its going of service. This is a simple replacement but first you have to locate where it is. Some are on top of the transmission . Some are on the side they can run from 42. to over a 100. shop around for the best deal. I have the same problem
The ecu is to the left inside the passenger compartment and behind and to the left of speedometer.
first, locate where the speedometer goes into the transaxle or transmission housing. unscrew speedometer drive from transmission housing and pull the speedometer cable out. the end of the cable unit has a couple of dipstick marks on the bottom of speedometer cable end you just removed. hope this helps. mine has 245000 miles on it and still going strong !!!
It is inside the fuel tank
To change the antifreeze on a 2003 Saturn Ion-3, locate the drain plug on the bottom of the radiator. Drain the liquid into a pan before refilling it.
Used Saturn automobiles may be purchased at a variety of new and used automobile dealers, including many of the dealers who were authorized to sell the Saturn new. The Saturn website provides a list of the authorized Saturn dealers in your area. Local auto auctions are another place you might locate a Saturn to suit your needs.
You can contact any GMAC dealership in your local area and find our more about Saturn cars and trucks. They are now manufactured under the GMAC family of auto and truck brands.