I have Mazda 5, 2009. gear 1 and 2 doesn't have usual power. But 3 to 6 is flowing.

Check your tyranny fluid is full, sounds like you may have blown a transmission band.... usually in an automatic transmission the car will go to what seems like neutral on the gear that is gone, usually preceded by a few months of hard jerky shifting. Not much to do if this is the case but to get a rebuild or new transmission, it will continue to get worse as you get higher mileage ( other gears will start to go) . These things happen over time. Sorry of that is the case.

MAZDA ORIGINAL OIL ATF M-V - Mazda - Gear Oil - Finol Oils

www.finol.ie > Products > Automotive > Gear Oil
Following models can use Mazda Original Oil ATF M-V. Mazda 3, Premacy, Mazda323, Demio, Mazda 121, Mazda 626, Mazda 6, MPV. Suitable for power ...

First pull the timing belt tensioner then slip the belt off the cam gears. You then need to find TDC (Top dead center). 3 ways to find TDC 1) There are marks on the crank pulley align them for TDC. 2) Remove timing cover and use crank gear mark seen in link below 3) Put the dip stick in cylinder 1 and turn engine until dip stick stops going up. After finding TDC align cam gear marks seen in link below. Now make sure both cam and crank stay in position and slip timing belt back on (you can move the cam gear to get the belt on but make sure the marks are aligned after the belt is on). Last tighten the belt tensioner, I usually use my finger or an extension to get some more tension on the belt. You might have to remove engine mount bracket makes life much easier as the front cover section is TIGHT !!!. Turn engine a few times to make sure you have compression and engine turns without getting stuck. See link below good luck.

http://bladeagenos21.soup.io/post/374487151/timing-marks-on-mazda-626-1994-diagram

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If you have gone to a shop to have your transmission maintained, I would get them on the phone immediately. Foreign cars, especially shiftronic trans. usually use different fluids. If they have put the wrong fluid or forgotten a filter, etc., you may have a destroyed system. Double check with your fluid type and the type inserted in your vehicle.

1.remove speedometer driven gear
2. remove drain plug, and drain oil
3. fill trans, check fluid by speedometer gear, just above gear see F & L, oil level is between F & L
4. install speedometer driven gear

for better help with this go to mpvclub.com there are a great bunch of guys there, with ALOT of expertise.

I have a mazda 626 88 model, i cannot use my gear, only gear 1&3 is working the rest gear refused to work and the reverse on gear refused to work as well. what do i do?