TCC Tuning Issue

[BlownSierra]

It appears as though my pcm is using my cruise table for tcc settings as opposed to normal. I changed my shift points, tcc lockup and tcc pressures and everything seems right except for my tcc lockup. I cannot get my tcc to lock in third or below 50mph at any tps. I searched my settings and found that the only entry near 50 was 49 in my cruise settings. I've attached my .tun.

Thanks in advance

02_sierra_2-23-11.tun

[goldbergv95]

Try setting all your missfire tables to max (32767).

[BlownSierra]

Would knock sensor cause it to choose a different mode? I haven't logged a misfire in a while. I just noticed that my performance mode unlock is set to 50.... Is there any reason my pcm would read performance mode instead of normal when tow/haul isn't engaged?

[Taz]

Record a log with the following PIDs:

• GM.GEAR (Current Gear)
• SAE.RPM (RPM)
• GM.TSHIFT (Shift Pattern)
• GM.TCCMODE (TCC Mode)
• GM.TFT (Transmission Fluid Temperature)
• SAE.VSS (Vehicle Speed)
• GM.TP (Throttle Position)
• SAE.ECT (Engine Coolant Temperature)

This should help sort out when the convertor is / is not locking.


Regards,
Taz

[joecar]

Also, TSTATE09 and TSTATE10 give reasons for no lock.

[BlownSierra]

I'm setting up my PIDs now and I'll run that log in a few. The converter does lock, in fact, consistently as soon as I hit 50, which would indicate to me that it is reading my performance tcc table. However, when I tried tow/haul this morning the shift points clearly shifted to the performance table and wouldn't lock unless I went highway speeds to get it into fourth. I'm running 2002 12212156 and I did a segment swap when I switched to my 4l80e. Is there any way I did the segment swap wrong or it's corrupt?

[Taz]

I take it you copied over both the transmission calibration and transmission diagnostic segments. What vehicle / tune file did you take the segments from ? Could you post that tune also ?


Regards,
Taz

[BlownSierra]

I re-downloaded the 2002 6.0 4l80e tune from holden crazy, did a segment swap from my old files except for trans calibration and manually redid my trans cal and everything seems to work just fine now. Weird.

[Taz]

Nicely done ! Sometimes it doesn't matter why things work - just as long as they do.


Regards,
Taz