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Author Topic: Can't connect when ignition is on  (Read 24621 times)
BlackT
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« Reply #15 on: November 16, 2020, 11:41:11 AM »

I have a audi B4 with swaped  APU engine, 512 kb ECU, IMMO OFF, direct K-line
First I was able to start logger while engine is ON, problem is as soon I hit full throttle it really slow down logging and it stops
baud rate 56000, I log around 45 variables, 20 samples at second
Then I put ECU from audi TT, and things got even worse. It can connect sometimes at 19200 baud rate, but same thing at soon I hit full throttle it stops logging
And now it can't connect when engine is running on both ECUs, I try to log just few variables, and it continue to log while engine is running but only for few seconds then it stops
I connect OBD few cm from ECU, both ground and K-line and still it can't log while engine is on. Nefmoto can't connect too while engine is on
First log  is when engine is running and everything is OK, and second log is from today, it stops few seconds after engine is on

updates:
Same ECU different car (audi TT MK1), i put K-line direct to ECU, ground and 12 V from OBD port. I start logging while engine is off, then start engine and logger work without problems. I put sample time to 30, sometimes on 50 it break connection.
So I can confirm logger is working on 512 kb 8N090601AB ECUs also
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rdrage
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« Reply #16 on: November 17, 2020, 04:05:22 PM »

updates:
Same ECU different car (audi TT MK1), i put K-line direct to ECU, ground and 12 V from OBD port. I start logging while engine is off, then start engine and logger work without problems. I put sample time to 30, sometimes on 50 it break connection.
So I can confirm logger is working on 512 kb 8N090601AB ECUs also

Just be carefull about logging > 20 hz or many variables.

If the ECU load goes above 95-96% you can have "Ignition cut-off" for a split second. The ECU overloads and have to reset.  you will really feel that in your car. Its almost the same as removing the MAF sensor and hit full throttle Tongue

for 512Kb ecu (C ecu s4 b5), it looks like its not a problem. I can read 80 variables att 20 Hz --> The ecu load is still under 90%
For 1024kb ecu (like M/F/K for s4/rs4 b5) i dont recommend driving with 80 variables att 20 H, because ECU load will be close to 95-96%. Only do it during a pull.

For daily driving and logging, im running 30 variables att 10 Hz on my 1024Kb ecu. Never had "ignition turnoff" with this setup. I have problably over 300 hours logging in the car.



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