How to run log with VAGCOM

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How to run log with VAGCOM

Post by Yakuza Racer » Sun Dec 23, 2012 10:21 am

STOLEN from here...

How to run log with Vag-com
So you are having issue with your car and you don’t know where to start? Do you want to check your boosting/fueling or any other issues? You might want to run logs to see what is going on within your ECU (engine control unit).

Before starting:
-Safety is really important, please be CAREFUL to not harm yourself or anyone else while driving high speeds.
-Most logs should be done in a third gear Wide-Open Throttle (WOT) from 2000-6500 rpm. If this cannot be achieved, then second gear WOT can be done.
-Great speed can be achieved in third gear, so make sure to respect speeding limits.
-Do not manipulate the laptop while you are driving, it can be very dangerous.
-It is also recommended to have someone else hold the laptop and manipulating it while you are driving.

First of all, you need a few things:
-Vag-com cable (for 2006+ model, you want the USB model with hex+can)
-Laptop
-A car with OBD port (obviously)



Next step is to plug the Vag-com cable into the OBD port of your car. Depending on your model, the location may vary, but for most of them, you can look underneath the dashboard on the driver side. Once plugged in, connec the other end into to USB port of your laptop. The ignition needs to be ON if you wish to start the communication with the ECU and to run the log, otherwise you won’t get much data.

Next step: Start Vag-com and click on “select”.



Then choose “engine”



You are now logged into you engine control module, from that point you have multiple possibilities. It is always good to start by looking at fault codes by clicking on “fault codes – 02”. You might want to note what’s going on and clear them. By clearing the fault code, you also reset fuel trim and put everything back to normal.



You might want to note or copy them by using the “copy codes” button and clear them. By clearing the fault code, you also reset fuel trim and put everything back to normal.



Went you are ready to run logs, click on “measuring block – 08”



On that screen, you must enter the group you wish to see and press “go”. You can enter up to 3 groups at a time.



Here’s a nice cool feature, if you press the “turbo!” button, the sampling rate will run much faster (More data per seconds).



When you have chosen the block you want to log, press the “log” button at the bottom.



On this screen, you have a field to give your file a name and the “browse” button is used to chose where you want to save it. When you are ready to begin your log, press on “start”.



You are now logging all the groups that you chose! When you are finished, press the “stop” bottom, and the log files have been collected.

You might ask yourself: "Which group should I log?"
Well, take a look at these:

Group 001:
Engine speed: RPM
Coolant Temperature: Temp in *C
Lambda controller: % of correct to the a/f mixture according to O2 reading. %>0 = adding fuel to achieve requested A/F, %<0 removing fuel

Group 002:
Engine speed: rpm
Engine Load:
Injection timing: Time the injectors are open to inject in milliseconds
Intake Air Mass: grams of air per seconds your MAF is reading

Group 003:
Engine speed: RPM
Intake Air Mass: grams of air per seconds your MAF is reading
Throttle Drive angle sensor 1: Position of throttle plate in %
Ignition Timing angle: Your current timing

Group 004:
Engine speed: RPM
Voltage supply: Current voltage
Coolant Temperature: temp in *C
Intake air temperature: Temperature of air getting into your engine

Group 005:
Engine Speed: RPM
Engine load: in %
Vehicle Speed: speed at which you are going. (Your cluster might be off, but this is the right speed)
Load status: The mode you are in

Group 006:
Engine Speed: RPM
Engine load: in %
Intake air temperature: Temperature of air getting into your engine
Altitude Correction Factor: Factor to correct mixture with your altitude. (As you get higher, air is getting thinner and less oxygen. The ecu use this factor to correct maps according to altitude)

Group 010:
Engine Speed: RPM
Engine load: in %
Throttle Drive angle sensor 1: Position of throttle plate in %
Ignition Timing angle: Your current timing

Group 011:
Engine speed: RPM
Coolant Temperature: Temp in *C
Temperature: Outside temperature in your engine bay.
Ign. Timing: Timing

Group 014:
Engine speed: RPM
Engine load: in %
Misfire Counter (total): Total of misfire since you started your car
Misfire recognition: Enable or Disable

Group 015-016:
Misfire count per cylinder

Group 022:
Engine speed: RPM
Engine load: in %
Cylinder 1 ignition angle delay: Timing retard for cylinder 1
Cylinder 2 ignition angle delay: Timing retard for cylinder 2

Group 023:
Engine speed: RPM
Engine load: in %
Cylinder 3 ignition angle delay: Timing retard for cylinder 3
Cylinder 4 ignition angle delay: Timing retard for cylinder 4

Group 031:
Lambda factor: current Lambda value. (Multiply by 14.7 the value to get to a/f ratio)
Lambda factor: current SPECIFIED Lambda value. (Multiply by 14.7 the value to get to a/f ratio)
The specified value is the value the ECU is requesting to your engine.

Group 032:
Lambda (idle) self adaptation: Adapted fuel trim for idle
Lambda (Partial) self adaptation: Adapted fuel trim

Group 113:
Engine speed: RPM
Engine load: in %
Throttle Drive angle sensor 1: Position of throttle plate in %
Atmospheric pressure: Actual atmospheric pressure in mbar

Group 114:
Engine load (specified)
Engine load (spec corrected)
Engine load (actual value)
Wastegate (N75) Duty Cycle: The duty of your n75 controlling boost

Group 115:
Engine speed: RPM
Engine load: in %
Boost pressure (specified): Boost pressure requested by ECU
Boost pressure (actual): Actual boost pressure
To get PSI, you need to convert mbar. To do so, actual reading * 0.0145 = PSI. But don’t forget to subtract actual atmospheric pressure collected in group 113

Group 118:
Engine speed: RPM
Intake air temperature: Temperature of air getting into your engine
Wastegate (N75) Duty Cycle: The duty of your n75 controlling boost
Boost pressure (actual): Actual boost pressure
Mine: Jetta 6 TDi
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Re: How to run log with VAGCOM

Post by dood786 » Tue Jan 08, 2013 3:46 pm

Thanx

Moved to FAQ

The grouping isn't the same for all cars iirc
Noob
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