ECU to Laptop connection issues

[rob@vems.co.uk]

Also meant to say that I got a random warning message that may shed some light on the situation: It only happened twice but it said:

Controller code version does not match signature in vemsv3.ini (see audit.log for where the above file was found)
Expected " vems v1.1 12x12 kpa = 2,2" (found in ini file)
Received "0x51" from controller table" Table corruption may occur. This is usually serious.
Terminate?"

I was worried to say the least....

If its said this then you have had MegaTune start-up, open the serial port, send the VEMS a versionInfo request, and the VEMS respond with 'something'.

[young_un1]

Ok, the saga continues....

Firstly, many thanks to rob for his time checking over the serial connection on the VEMS unit.

I was hoping that there would be something wrong with the unit but everything is working fine on the test bed so the question remains...why cant I connect to the VEMS Unit from my laptop?

Has anyone had a similar experience? The terminal program shows that the serial port is working, however I cannot get a "Success!" message when testing my com links.

I have checked the .cfg files and the first line is displaying the same com number as I am trying to use.
I have tried multiple laptops as well as different usb serial and pcmcia to serial adapters but am getting the same problem.
The earth is also strong and shows good continuity throughout the vehicle.

I'm at a loss as to what else to try.

Does anyone have any suggestions please? It doesnt matter how wacky or far flung they are; i'll try anything at this point - I just want to hear the car run!!!!

Many thanks,
                  Alan

[Bat]

Hi,
I'm no expert on this, but it seems to me you're using the wrong version of MT.
The serial program isn't bothered what version of firmware the ECU is running, but MT won't play ball unless both ECU and MT versions match.
Cheers,
Gavin

[rob@vems.co.uk]

Damn!  This is really puzzling...
Bearing in mind what Bat has jus written:
http://www.vems.co.uk/VEMSTech/VemsMT1.1.18.zip

Thats the right one to use, its the same as was on the CD that came with your ECU

[rob@vems.co.uk]

If you are getting the Hello response in terminal and then go directly to MegaTune then you'll never get a response.
Make sure that you type byebye then click disconnect, and then close Terminal before you start-up MegaTune

Rob

[young_un1]

Well the good news is that I've finally managed to get the laptop and VEMS unit to connect successfully!
The bad news is that I'll probably be asking you guys lots more questionos from now on:)

To that note: have been doing the usual things like calibrating the TPS etc today however I haven't burnt the settings to the ECU as I'm worried that I'll end up overwriting the values already loaded up by Rob. I noticed that the fuel cut value was showing up as 23300 rpm and I'm assuming that the map you already loaded has a sensible value for this, which I dont want to lose. If i click burn to ECU will i have a fuel cut at 23k rpm?! Sorry this is probably a silly question...

[rob@vems.co.uk]

Well the good news is that I've finally managed to get the laptop and VEMS unit to connect successfully!
The bad news is that I'll probably be asking you guys lots more questionos from now on:)

RESULT

To that note: have been doing the usual things like calibrating the TPS etc today however I haven't burnt the settings to the ECU as I'm worried that I'll end up overwriting the values already loaded up by Rob. I noticed that the fuel cut value was showing up as 23300 rpm and I'm assuming that the map you already loaded has a sensible value for this, which I dont want to lose. If i click burn to ECU will i have a fuel cut at 23k rpm?! Sorry this is probably a silly question...

Go ahead an burn away - I have a backup of the settings here.  But you should also make backups as you go - use download-config.bat and rename the config and tables files to something memorable before each change.

Fuel Cut is at 25500 as a rule - this is effectively turned off, which is the idea as you dont want a feature like that activated until you've got some of the tuning done.

Questions are good, please put them into your project page or a pertinent section in the forum, then it makes the questions and answers easily available to others.

Rob

[young_un1]

Awesome, time to tinker!

Am I right in thinking that I will need to calibrate / adjust the following before cranking and hoping it fires using the supplied nissan maps...

TPS
Battery Power
MAP
Injectors

I'm sure i've forgotten something...

[rob@vems.co.uk]

I set the battery and MAP at the same time as calibrating the wideband sensor.

Setup the TPS.

Then the timing.

And then work out the Req fuel and we can start the firing up process

Rob