OBD-II Mode on 2003 VY Comodore Calais

[whorsfall]

Hi,

I am wondering if somebody can help me out talking to my ECU on a Holden Commodore 2003 VY Calais.

Anyway once I plug in my ELM327 and issue the command 0100 I get the following error:

BUS INIT: ...ERROR

Any ideas on what I am doing wrong.

Thanks,

Ward

[one_and_only2004]

It's not OBD2 compliant, there's your problem. It's ALDL with an OBD2 style connector.

[whorsfall]

Hi,

Thanks for your response. Besides it using the same connector how else are the different. So for example are the electiricallty the same and I can just issue a different set of AT commands to make it work?

Do you have any info on the protocol?

Thanks,

[one_and_only2004]

I don't really know much about it, all I know is your OBD2 cable won't work at all - I've tried it myself. ALDL cable's have different internals. You can usually pick them up off ebay though.

The protocol itself is apparently a GM variant of OBD1, but that's all i can tell you - sorry i can't help any more than that.