VW Passat B5 - KW1281 Incorrect ECU response

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ervinke2

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	VW Passat B5 - KW1281 Incorrect ECU response « on: November 09, 2017, 03:09:47 AM »

Hello guys,

I'm trying to make an STM32 based data analyzer.

My problem is after the 5 baud init, I get the 0x55 0x01 0x8A which is good, then I respond with the 0x75. I get back the 0x75 as echo, and here comes my problem, then I receive 0x0F 0x0F 0x0F. I should get only one I suppose. It doesn't matter if I ack any of it. And after the last 0x0F the communication stops.

What could be wrong?


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ervinke2

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	Re: VW Passat B5 - KW1281 Incorrect ECU response « Reply #1 on: December 08, 2017, 03:13:32 AM »

I found out what was my problem. I had an incorrectly set 8N1 serial protocol.


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ervinke2

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	Re: VW Passat B5 - KW1281 Incorrect ECU response « Reply #2 on: December 08, 2017, 10:20:25 AM »

Now I have another problem. I'm trying to communicate with the Engine Controller Unit. It's working until my STM board is powered from my notebook. When I change it's power source to a Car USB charger it's not communicating. I can't even hear a relay then.


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