Atm Pcm Shifting And Solinoids

[Ken Potter]

Can someone be specifice on the PCM shifting of the 1998 ATM? What are the inputs to the pcm to determine when to shift and how does the outputs work when it commands the trany to shift. I see there is solinoid1,2,3 that must recieve a single from the pcm and it alters the trany.
Im wanting to accomplish altering this race car so it does not shift so soon and allow my rpms much heigher. I may have to install manual switches in the car and shift manualy myself once I understand what those solinoides do and how it works.
thanks guys Ken

[iceracer]

In puts to the ECM are temp, throttle position,engine rpm, road speed etc. Not sure what kickdown would give you. what kind of racing are you doing that you need to shift.
There are shift kits that alter the shift pattern also something with reistors.

[Ken Potter]

Yes, you are correct about the resistors being added ( 10kohm) but it is my understnding adding a resistor alters how hard it kicks in not alter the rpm of the motor when it kicks in at.
Im doing dirt oval racing with this. The length and tightness of this race track is such that our mph speed is to high in the corner for it to kick down into L by itself when you floor it coming out of that tight corner hence leaving it in D gear kills us being the rpm is so low. So this is why I wanted to understand those trany selinoids that the pcm controls. If I understand those selinoids I can use my own switches and control them myself from the drivers seat. Kind of like a manual shift car that is really and automatic. heheh Im sure it will work if I understood those selinoides or other means to fake out the pcm and not shift so soon. So far no one has responded as to how those selinokeds are controled or what selinoide 1,2,3 are.

[Jaybird]

Well whether this helps or not, I recently had solenoid B (#2) go bad on me. It caused the tranny to stay in 3rd all the time. I could only get it to go into 1st by putting her in L. When I put it into either D or OD it immediately went into 3rd. Other than that I had no overdrive or any other gears.

[J_Mob]

You need my old tranny....it wouldn't shift to second until like 5000 rpms, then it hit all the rest of the clutch packs at the same time and stayed in second (like a super second-LOL). Had some good torque but totally f'd the inside of the trans up.......I am kidding of course unless you really want it, then I could ask the guy who did the swap if he took it back yet for core or not.....

I had shift sol A code for the above trans......I think dude told me it was 2-4(OD) but could be mistaken.

[Spyke-Zee]

buy SCT, or install a shift kit. my ATX shifts around 7000K-7500K.

[iceracer]

Unfirtunately, this transmission is a poor unit for oval racing since you can't lock it in second gear. If you could get hold of a Ford powertrain diagnosis manual perhaps it would help. as spyk said , a chip might help.
BTW, I hope you have installed an auxillary cooler.

[Ken Potter]

Thanks guys for any info you have on these trany selinoides. I know SCT would make all my issues go away but for a great cost too and the budjet just cant allow that. Once the information is known on those selinoides it shouild not be hard wiring/rewiring those selinoides to achieve what i want. ( no heigher than 2nd gear) Again, manual switches next to the driver should be able to do the same control as does the PCM but with the drivers decision. I could even use the switches on the shifter (down by the trany) to do my energizing/deenergising directly to the selinoids and keep it all on the shifter instead of installing switches. Might be the first manual automatic trany on the race track. Yes guys I got a trany cooler.
I may end up jacking up the car and doing my own voltage testing on those selinoides to see what they do from one gear change to the next. Maybe the PCM energises selinoide 1 for L gear, and then 1&2 for second gear, and then 1,2,3 for drive,ext. Not sure.

[Tygen1]

Does this help get ya started?

Edit: I couldn't copy the page, so I had to save each picture. If you need help putting everything in order, let me know. This ought to get you going if you don't already have this.

[Ken Potter]

OH Thank you very much for these diagrams, it will save me hrs of tracing it out. I did do some preliminary work last night and I can tell you there must be a major diffrence in the gear ratios from 1st to 2nd gears. 1st gear is acually not to bad but where this trany falls on its face is when it shifts to second.

[Twiggy2cents]

the solenoids arnt as easy as first gear sol second gear sol etc..... the are commanded on in sequences and what not to hold certain things... and they are different from D in first gear and manual L in first gear, the transmission is a very complex thing to try to control

[Tygen1]

Let me know if you are needing more, that is all I could find (in a reasonable amount of time wandering thru alldata). I'm sure I could find more if I had the time.
I'm glad I could help out.