Can't calibrate CLT / IAT

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schmidt
MegaSquirt Newbie
Posts: 15
Joined: Thu Dec 29, 2005 11:37 am
Location: Sao Paulo, Brazil

Can't calibrate CLT / IAT

Post 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
Not Ms'ed...
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Bernard Fife
Super Squirter
Posts: 1009
Joined: Mon Feb 16, 2004 3:15 pm

Post 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.
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schmidt
MegaSquirt Newbie
Posts: 15
Joined: Thu Dec 29, 2005 11:37 am
Location: Sao Paulo, Brazil

Post 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
Not Ms'ed...
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schmidt
MegaSquirt Newbie
Posts: 15
Joined: Thu Dec 29, 2005 11:37 am
Location: Sao Paulo, Brazil

Post 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... :cry:
Tomorrow I'll try flashing MS-2 with 2.66 code (I know, it's beta), and try again...
Any ideas? 8)

regards
Not Ms'ed...
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schmidt
MegaSquirt Newbie
Posts: 15
Joined: Thu Dec 29, 2005 11:37 am
Location: Sao Paulo, Brazil

Post 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 ? :lol:

Cheers
Not Ms'ed...
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Ricardo_Penteado
MegaSquirt Newbie
Posts: 10
Joined: Mon Jan 02, 2006 10:15 am
Location: Sao Paulo - BRAZIL

Post 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... :?:
Brazilian Megasquirt Team Member
Assembling (again) MSII V3.0
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jsmcortina
MegaSquirt Guru
Posts: 332
Joined: Mon May 03, 2004 12:34 am
Location: Birmingham, UK
Contact:
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Post 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
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