Automatic Transmission feels like shifting early and not downshifting right Mazda 3 2008 1.6

[iameldrin]

Hi guys I find it strange that my mazda 3 2008 1.6 is like shifting early, from 0-20 from first gear to 2nd gear and like from 20-30 to 3rd gear and 30-40 or sometimes 70 to 4th gear i find it weird that it shifts so early and when the speed is slowing down when it reach the 40 mark it doesnt change the gear from 3rd to 2nd but wait till its like 10 to shift to 1st, im thinking whether its a speed sensor issue or solenoids, I newly replaced my ATf so I know its not a problem, any idea? guys, there is no CEL or AT light what so ever

[StockEngine]

Tama ba yun atf fluid type? I'll start there..

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[iameldrin]

Dexron po ung nilagay ng mechanic ko nung nag papalit ako ng ATF eh, pero i never heard na mag kaka gnung ung tranny pag ATF, alam ko usually pag madamumi na saka nag kaka problem, well im still new to this so i might be wrong

[StockEngine]

There are different varieties of dexrons...

Dexron 2
Dexron 3
Dexron 3h
Dexron VI

If you put the wrong type of dexron.. damage will happen.



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[iameldrin]

lets say that the ATF fluid is correct what could be the culprit? i can still drive the car nmn though hirap lang pasalunga and i tend to gas more since hnd nag ddownshift sa 2nd gear when slowing down

[sirkosero]

^ pwedeng low or overfilled naman ang atf

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[iameldrin]

the fluids are within the level naman,

iniisip ko palitan ung speedsensor since i think its the cheapest part to buy for now since sbe sa ibang article pede daw cause un ng early shifting or some shifting problems, pag all else fail solenoid

[Lakwatsero]

Nangyari ba yung alangang downshifts before replacing the ATF? You said newly replaced fluid, if that's the only thing you changed prior to the symptom, there lies the problem.

[iameldrin]

the shifting problems was already present when i got the car (2nd hand kasi) even before replacing the fluid

[jick.cejoco]

Is the MIL on when this happens? Other enable criteria includes TPS and ECT ( throttle sensor and coolant temperature) sensors to determine shift points.

[jick.cejoco]

Also, check and verify the accuracy of your speedometer.

[iameldrin]

Also, check and verify the accuracy of your
speedometer.

Actually i plan to replace the speed sensor today since i read that sometimes it affects the shifting

[oj88]

Hi guys I find it strange that my mazda 3 2008 1.6 is like shifting early, from 0-20 from first gear to 2nd gear and like from 20-30 to 3rd gear and 30-40 or sometimes 70 to 4th gear i find it weird that it shifts so early and when the speed is slowing down when it reach the 40 mark it doesnt change the gear from 3rd to 2nd but wait till its like 10 to shift to 1st, im thinking whether its a speed sensor issue or solenoids, I newly replaced my ATf so I know its not a problem, any idea? guys, there is no CEL or AT light what so ever

The ATF has very little to do with shift points. Shifting is done through solenoids that are directly controlled by the ECM/PCM. What you're noticing might be normal.

When accelerating, if the gas pedal is pressed lightly, the ECM may shift early to be more fuel efficient (unless it detects more load or if the vehicle is going going uphill). However, if you mash the gas pedal to the floor, the ECM knows that you want maximum acceleration and so, it will typically delay shifting to get the most out of the engine's power band.

When you take your foot off the gas pedal, the A/T behaves differently depending on the vehicle. Modern A/Ts will only shift down when the brakes are engaged and/or if it detects that the vehicle is going downhill. It will also shift down when the speed is low enough so it will be at the correct gear and be able to accelerate immediately as soon as you step on the gas. Otherwise, it keeps the current gear to allow the vehicle to coast more freely, again to increase fuel economy.

[iameldrin]

The ATF has very little to do with shift points. Shifting is done through solenoids that are directly controlled by the ECM/PCM. What you're noticing might be normal.

When accelerating, if the gas pedal is pressed lightly, the ECM may shift early to be more fuel efficient (unless it detects more load or if the vehicle is going going uphill). However, if you mash the gas pedal to the floor, the ECM knows that you want maximum acceleration and so, it will typically delay shifting to get the most out of the engine's power band.

When you take your foot off the gas pedal, the A/T behaves differently depending on the vehicle. Modern A/Ts will only shift down when the brakes are engaged and/or if it detects that the vehicle is going downhill. It will also shift down when the speed is low enough so it will be at the correct gear and be able to accelerate immediately as soon as you step on the gas. Otherwise, it keeps the current gear to allow the vehicle to coast more freely, again to increase fuel economy.

I think this is a good explanation on what im encountering, so do you think its normal that it doesnt shift to 2nd when slowing down to conserve more fuel? Since it will directly shiftto 1st in near stop i guess u really saved my ass by overthinking too much

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[oj88]

I think this is a good explanation on what im encountering, so do you think its normal that it doesnt shift to 2nd when slowing down to conserve more fuel? Since it will directly shiftto 1st in near stop i guess u really saved my ass by overthinking too much

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A/Ts behave slightly different from vehicle to vehicle. Unfortunately, I've never driven a Mazda to form a more definitive answer. However, the particular behavior you described still seems to fall within the norms of A/T operation. Shift points are never a fixed value. Like other parameters such as air/fuel ratio, it responds to pre-determined maps based on sensor inputs (ie. Engine load, RPM, speed, accelerator pedal position, coolant temp, etc.) and shift points are changed dynamically depending on what the ECM/PCM 'thinks' is the most efficient way to shift up or down.

Also, the reason you have low gears (1/L, 2, D3, etc.), aside from its other obvious uses, is to give the driver the option to engage engine braking if he deems it necessary. Otherwise, if you leave it in D, the A/T logic takes over all control and just rely on its own sensors to decide what to do.


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[iameldrin]

A/Ts behave slightly different from vehicle to vehicle. Unfortunately, I've never driven a Mazda to form a more definitive answer. However, the particular behavior you described still seems to fall within the norms of A/T operation. Shift points are never a fixed value. Like other parameters such as air/fuel ratio, it responds to pre-determined maps based on sensor inputs (ie. Engine load, RPM, speed, accelerator pedal position, coolant temp, etc.) and shift points are changed dynamically depending on what the ECM/PCM 'thinks' is the most efficient way to shift up or down.

Also, the reason you have low gears (1/L, 2, D3, etc.), aside from its other obvious uses, is to give the driver the option to engage engine braking if he deems it necessary. Otherwise, if you leave it in D, the A/T logic takes over all control and just rely on its own sensors to decide what to do.


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Yeah i think mazda has differen way kg matic transmission anw thanks for the help it really clears my mind thank you

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