I have a Land Rover Defender 2002 with a Bosch ECU reference NNN0000 120 and td5 engine.
On the other hand , I have a Chinese ELM327 1.5V (peak ic) in USB connection .
I discovered thanks to your forum it was possible to manually control the ELM from control lines ( AT Commands ) from Hyperterminal software (windows) or others.
I get to talk to each HyperT and ELM . So far so good.
The defender has an OBD socket and the ECU is connected to pin 7 of the socket.
A friend who happens to interact with an Arduino board gave me the boot sequence following dialog :
It sets the line HIGH for 300 ms , then LOW for 25 ms , HIGH for 25 ms and then
send at 10400 baud init the frame :
81 13 F7 81 0 C
This is the only frame That Is not Preceded by the length .
According to this information, and after much research , I deduced that the init sequence came from the ISO 14230 standard ( derived from KWP2000 on pin 7 ) . I have a confusion about whether it is fast or slow init . What do you think about that ?
So, I tried a number of AT commands with the only response BUS INIT: ERROR ! !
Furthermore, According to my readings , I have a problem delay between wakeup sequence and sends the word 81:13 : f3 : 81:0 c .
This friend also tells me that the ECU is not OBD , it was imperative to reading pids by localidentifier . Communication is blocked by a system of seed / key .
So at first , I look with my ELM327 to reproduce the sequence of init to at least have a positive response. Can you help me?
Given the notion of delay, HyperT Is the software suitable ? Or is there a programmable console with timers ?
Last edited by beurk; 11-19-2013 at 01:52 PM.