[Revisily]

So recently I bought a 2004 Mazda 3 hatchback 2.3l automatic. Transmission was wierd when I got it. Had to baby it for it to switch gears just right and would stick in certain gears for a while acting like a manual until I came to a complete stop or what not.

replaced the transmission with another used transmission. Now when I hit 3rd gear it goes into limbo and acts like it’s in neutral revving to high rpms and reverse doesn’t work. It did pop a p0500 code for thevehicle speed sensor a. I need help lol please!

 

[arathol]

Did you try to diagnose and fix transmission #1 or did you skip right to the part where you replaced it?

 

[Revisily]

Did you try to diagnose and fix transmission #1 or did you skip right to the part where you replaced it?

I just skipped to the hardest part and tried to replace the transmission.

 

[arathol]

Best thing to do here I think is stop throwing money at the car and get help from a transmission shop.

 

[Revisily]

Best thing to do here I think is stop throwing money at the car and get help from a transmission shop.

Any other advice?

 

[Mike C]

Any other advice?

If your car has a TCM, I'd have a look at it. In fact I'd have looked at it before I changed the transmission.

 

[arathol]

If the car is a 2004 model it probably doesn't have a separate TCM. From what I have seen 2006 was the first year for that.

 

[Revisily]

If your car has a TCM, I'd have a look at it. In fact I'd have looked at it before I changed the transmission.

If the car is a 2004 model it probably doesn't have a separate TCM. From what I have seen 2006 was the first year for that.

Since I think my tcm and ecm are a 2 in 1. Should I just replace that with another one?

 

[Mike C]

Since I think my tcm and ecm are a 2 in 1. Should I just replace that with another one?

Are you sure it controls the transmission? - note if it does you should be able to read fault codes. Swapping parts can be an expensive way of solving problems but I'd try it if I could get a good replacement unit cheaply.

 

[Gary_L]

Since I think my tcm and ecm are a 2 in 1. Should I just replace that with another one?

You should do as arathol originally suggested and have the car properly diagnosed. Throwing parts at a vehicle, hoping to fix the problem, is a foolhardy and ex$pen$ive approach. You're going to feel really stupid if someone gets in there and discovers the problem was caused by a corroded connector or a broken ground wire. Modern vehicles are VERY susceptible to issues which corrupt the +/-5V potential needed for proper operation.

 

[Mike C]

You should do as arathol originally suggested and have the car properly diagnosed. Throwing parts at a vehicle, hoping to fix the problem, is a foolhardy and ex$pen$ive approach. You're going to feel really stupid if someone gets in there and discovers the problem was caused by a corroded connector or a broken ground wire. Modern vehicles are VERY susceptible to issues which corrupt the +/-5V potential needed for proper operation.

Try cleaning every electrical plug connected to the TCM , the transmission and the selector with contact cleaner and clean and remake every ground. As Gary suggested might solve your problem cheaply and quickly.

 

[Juandedios74]

If the car is a 2004 model it probably doesn't have a separate TCM. From what I have seen 2006 was the first year for that.

I have a 2008 2.0L automatic but I don’t see a TCM. Is that a 2 for 1 deal as well?