MembersPage/MagnusKarlstrom (2006-03-30 02:32:13)

My plan is to install v3.3 on a Porsche 944 -83. My idea is to place the the genboard in a empty motronic box and use as much as possible of the original wire harness. I guess one of the bigger problem I will have to deal with is the trigger system with 2 VR-sensors, one keeping track of the referens point and one counting the 130 teeth on the starter gear. I understand it is a version of the "auditrigger".


060329

I get an error then starting Megatune, it says:

Controller code version does not match signature in vemsv3.ini

Expected "VEMS v1.0. 12x12 kpa=2,1"

Received "VEMS v1.0. 12x12 kpa=F,F"

It is a bit hard to tell if all the other readings are okay since I don't have sensor hooked up to the board. Battery voltage and TPS are however okay.

A very strange this is that the MAP value is following the TPS value!

No LCD.. yet..

Manmll returns:

RPM:0000 W00SFFI00

58 -00 c0000 i0000

clt:-40C adv:+00

0000 iac:040 122

kpafac=7D

kpaoffs=80

Can't find any errors here, ground is connected, +5V is stable, flyback is not connected since I haven't installed any injector drivers yet. (My first priority has been to get a working and stable trigger while cranking. Flyback, injectors, coil etc. are the last things before trying to start)

060328 first update since the dinosaurs left us...

Problem again

After moving to an other city and some other stuff I thought it was time to make some progress with the VEMS project. Downloading a new version of the firmware and Megatune felt like a good start, specially since the firmware now has support for the trigger on my car.

After having some problem with the firmware upgrade due to 50Hz disturbance triggering the LM1815 circuit I finally managed to figure that out with some help from Emil (using 'f' option to megaloader or prog.pl I guess). The board was upgraded to 036 and config files uploaded with some warning and an error.

I started Megatune and at a first look it looked okay, but it was not. The map value is not behaving normal at all, it starts at 0 and then slowly climbs to ~140 kPA shows no response to blowing and sucking in the hose to the MPX sensor. This worked okay before I started the upgrade. The MPX sensor also seams okay since the output voltage changes with the pressure.

My next step was to try to upload the firmware version I previously used but that didn't help, the map value is still crazy. It also took me many tries before I managed to upload the firmware despite that the trigger inputs now are shorted to prevent disturbances. The upload process fails at a random point and reports an error writing a word. After many tries and leaving the board disconnected for a while I finally managed to upload the 036 firmware and config again, but the map value is still crazy.

That is wrong with this board? Didn't it like to move from FinspĂ„ng to Örebro? I did :)


0510xx

Problem is probably solved! :) I replaced the xtal before I checked my mail and this page and that seems to have solved the problem. I made some comments below.

Serial cable and power cable has been attached to the board for some initial testing before soldering more parts to the board. The only problem is that it does not work the way it should.

Strange, because boards go through testing, during which all the supplies (7 or 8 including the max232 -8V), the ISP, the serial communication, the WBO2 pump circuit is tested.

Once you get it starting it will stay alive until you remove power for a few minutes. 5V supply is always okay and the reset signal goes to high every time you apply power.

Q: What to do next?

A very nice offer, hopefully I don't need a new board now.

0509XX


The parts has arrived and everythings looks fine. Delivery was very quick! :)