Originally Posted by
FelipeBZ
Hello,
May i ask you what is the "Torque Reduction Engagement" option? What changes when disabling it? How did you get specifically on it? (trial and error, or theory?)
I have a Fusion Titanium 2.0 Ecoboost AWD 2013 with 6F35 trans which have a very annoying shift delay (shift lag) specifically from 2nd to 3rd on high engine load and when the trans is cold. Its not a flare, the trans does not slips during the 2-3 shift... it just "holds" the acceleration until the shift is completed.
I monitored the SHFT_LAG PID on this specific gear change scenario (2-3, mid/high engine load) and i see values up to 1800ms when the trans is cold (fluid between 25 and 50 celsius), while on other gear changes i see it between 500 and 800ms).
After the trans is warm (running for about 30 to 40 min, where the fluid reaches around 90 celsius), this lag reduces to around 900ms. On light engine load situation, independently if the trans is cold or warm, the shift lag measured by the PCM stays around 500ms.
I already replaced the whole valve body (solenoid body + main control) and it didnt change. So, I checked the control signals of solenoids SSA/B/C/D comparing both scenarions and observed that, on high-lag situation, the command of SSB/C (both turn off from 2nd to 3rd) occurs is a much slower ramp (around 2000ms to complete) compared to the low-lag situation where the command of SSB/C takes only 1000ms to go from ON to OFF (ramp).
I see two possibilities:
1) PCM software is crap
2) PCM may be receiving incorrect data from some sensor, which makes it to take the wrong decision about how to drive the solenoids on that situation.
Any hint is appreciated.
Regards,