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Author Topic: KWP1281 group reading response of 0x02 and 0xF4 instead of 0xE7  (Read 2249 times)
Bazant
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Hellour
As a hobby I play with my VW T3 with a GolfIII petrol engine with a SIMOS 4s 1823 kw 1281 computer.

My engine control unit does not respond to group read requests with block 0xE7 as expected, but with block 0x02 and if I then query the same block several times with block 0xF4.
If I ask another block, the first time I get a response of 0x02 followed by 0xF4 ...

first shot
send: 04 0A 29 02 03
receive: 20 0B 02 80 20 00 89 66 00 85 1A 00 8C 28 11 00 10 20 30 40 50 60 70 80 90 A0 B0 C0 D0 E0 F0 FF 03

second shot
send: 04 0C 29 02 03
received: 07 0D F4 00 3F 79 2D 03

When vcds are combined, this group returns (002): 0rpm 64.3ms 12.3V 5stC

How to process this response to get data like from vcds? or is it possible to change the question so that ecu answers "E7".
From what I've read, answer 02 is a group answer with a text block

Regards
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