The S light is blinking to let you know the transmission control unit (TCU) has found an issue in your system. Your check engine light will come on after you have reached a higher speed (45-50+mph) and then slow back down below that mark. Right?
The resolution to your problem is to replace the vehicle speed sensor which is located on the back side of the transmission. See picture below...taken from the passengers side just above the fuse box in the engine compartment.
If you want to replace it yourself, you can pick one up for a reasonable price on ebay. Here is how to do it. First remove the big rubber tube that connects your air filter box to your intake manifold (you can see it in the top of the picture above). Next, get a 1/4" 10mm socket with an extension bar and an adapter to 3/8" socket with the 3/8" rachet (see pic below). The 1/4 rachet will work too, but it will be much harder to twist of the bolts with the smaller wrench. This is the perfect size to get in there and do what you need to do. There are two bolts that connect the sensor to the transmission...you can barely see one of them in the pic. It's also holding that piece of metal that the electical connectors are attached to. You might run into an issue of that bar being in the way of your socket getting over that bolt right at the bottom. I would make sure you can get in there are remove that bold before you order your part. I had to use an air hammer to punch mine out of the way, but you might be lucky. Anyway, just take that that bolt out, along with the one on the other side and pull the sensor along with the pin (you'll see it when you're in there). Put the new pin in from the new sensor (should come with one, if not use the old one), then put the new sensor on, bolt every think back on, reconnect your wiring, and you're in business!
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