Page 1 of 1
Can't calibrate CLT / IAT
Posted: Sat May 06, 2006 12:37 pm
by schmidt
Hello All,
Just wired up everything today, calibrated the TPS without any problem, but when I try to calibrate the CLT / IAT sensors it doesn't work !
When it says "Downloading entry xxx" it suddenly stops around entry 600 and doesn't change anything at all ...
BIAS resistors are 2490ohm, PCB V3, MS-2 running fuel and ignition (TFI), car is a VW Fox Wagon with FIC EEC system (with Megascott's board).
Shall I change the BIAS resistor for new ones with bigger resistance ?
Cheers
Daniel
Posted: Sat May 06, 2006 1:06 pm
by Bernard Fife
Daniel,
Tell us what values you are using, and we can try it ourselves. However, I suspect this may be a comms issue, not a calibration issue.
Lance.
Posted: Sat May 06, 2006 5:58 pm
by schmidt
Hi Lance,
I forgot to write the values ... Here it is :
CLT
- 13C : 18,5k Ohms
37C : 1,6k Ohms
93C : 238 Ohms
IAT
-14C : 1960 ohms
38C : 1100 ohms
93C : 185 ohms
I'm running Megatune on a Acer Travelmate 2200 with Prolific USB adapter, no problems at all, can burn VE tables, ignition, etc, without resets or loosing communication with MS...
I'll try to calibrate it on a Serial PC and will post the results.
Regards
Daniel
Posted: Sat May 06, 2006 7:40 pm
by schmidt
News :
Did a calibration with a real serial port, same thing... And yes, it was running at 115200 kbps, 8 pits, etc... no buffer.
I think that's a Megatune issue or something related to the MS-2 code, because, if i change the resistance value, it completes the calibration... I hope everything is ok with the daughtercard...
Tomorrow I'll try flashing MS-2 with 2.66 code (I know, it's beta), and try again...
Any ideas?
regards
Posted: Tue May 09, 2006 2:43 am
by schmidt
Hi All,
Just made the calibration, seems to be a megatune issue ...
1 - Calibrate the IAT, it stops around entry 600, then restart MT and try again, it downloads all the 1024 entryies.
2 - Try to calibrate the CLT, it stops too, restart MT, and try again, downloads everything too.
Wierd, hunh ?
Cheers
Posted: Tue May 09, 2006 5:02 am
by Ricardo_Penteado
Same configuration (in fact not exactly the same, I´m using the hall sensor input directly from the distributor). Same problem.
For sure it´s a bug in Megatune, because it only happens if you try to calibrate one sensor right after the other.
If you calibrate one (it doesn´t matter which), shut down Megatune, open it again and then calibrate the other, everything works perfectly...
Posted: Tue May 09, 2006 11:50 am
by jsmcortina
Very strange.
I did this myself on the 2.66 code with Megatune 2.25 (5th Feb) and your temp values. No problem.
James