Car automatic transmission - TCM control waveform/patterns

[Miyuki]

Hi,
I want to ask if is here someone who understand automatic transmissions ant their control

I have here old F4A32/A4BF1 (Mitsubishi/Hyundai) in one car, it is old simple 4 speed with 4 solenoid (A,B, pressure and damper)

I want to do some experiments and try own control unit for it

Selecting speed is simple 2 solenoid binary code
But what about pressure modulation and damper engagement, their PWM modulation

Is here any information about it ?

[discomike]

Ahoj! I can recommend that you checkout the DSM-ECU group on yahoo. It's mainly for the US DSM cars but all 90-ies Mitsu cars have a lot in common. Check the files area where they have some logs and scope-plots of various transmission signals, as well as disassembled and commented code for the F4A33 TCU.