GM 2.8L V6 ALDL

[Bill Shaw]

This sounds real similar to the '749 ALDL.  You might find the description of the '749 communications in Turbo_P4_Doc.pdf  in incoming helpful.

Bill

Shawn R. Lin wrote:

> It's a 7727, but I think you're right, the timing is VERY important.  I
> do have the F0 55 BB in the chatter as well.  If I send F0 56 01 B9
> repeatedly, maybe the 9th or 20th time the DIC will say "DIAGNOSTIC
> MODE".  However, that only lasts for a split second or so.  Once the ECM
> is in Mode 1, does it stay in Mode 1 until a command is sent to switch
> back to Mode 0, or do I have to send F0 56 01 B9 every time I want to
> get a Mode 1 string returned?
>

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