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The power button extends the time in each gear, the other button I think your describing juts up vertically in front of the AT selector. if you press this down you'll find that you can move the selector without having the ignition key in, it's a get out of jail card really
the probel with ur vehicle is the vehicles speed sensor located on the trans...the speed sensor is not hard to change at all... its located on the trans below the intake manifold and throttle body... it is held down by 2 ...10mm bolts...u can remove these bolts with a 1/4 in ratchet and a long 1/4 in extension and a swivel 10mm socket...wjen u remove it u will see a pin..that sometimes stays in the trans .. the new sensor comes with a new pin . make sure to put the pin in the trans portion first so it doesnt fall off when trying to put the sensor back on...try useing a 18in extension to reach the bolts...if u have or are going to purchase a new sensor , look at it and refer to it (to identify the sensor) be sure to install the new one exactly the way the old one came out...after replacement u will need to drive it for a little bit.. make sure the speedo is working ...the S LIGHT SHOULD ONLY COME ON WHEN PRESSING THE BUTTON ON THE SHIFTER..... GOODLUCK..
The ECT button stand for Electronically Controlled Transmission. In short, what the button does is change the upshift points for the auto trans. Normally, the 1-2 upshift is at 15-19 mph, pressing the button changes the shift mph form 15-19 to 19-22/23. More often than not, this feature wiooould be used if you are hauling a heay load, and the ECT gets you up to speed faster, via the longer time as mentioned above re the shift mphs. Not very useful with normal driving, it really does not do much without a heavy load.