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I found more info:
"The protocol implemented is the KWP-1281.
It involves setting the serial port to 5 baud.
Send out a 0x01, this is done by bit bashing the Tx line.
Set serial port 10400 baud straight away and listen for 0x55 0x01 0x0a from the ecu.
Then you need to sent an acknowledge message of 0x03 0x02 0x09 0x03. The ecu will then sent the ecu id back like 1 . 8 L R 4 / 5 V T after another ack you are ready to sent to the ecu some real request.
A message of say 0x04 0xd0 0x29 0x75 0x03 request a block read of group 117 (0x75) which is engine speed, throttle position and throttle drive."
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