Altering ECU Code/Data - GM16 pin OBD-II

[martin at mgass.demon.co.uk]

I want to know how to alter parameters on this complicated (surface 
mount EEPROM type) ECU. (SimTec)

So far I have found out the following :.

- Looks like Diacom is for monitoring only.

- Query still in with CarComp Inc.

-I know that Superchips know how to re-program via the OBD-II 
interface (which by the way I think is the ISO9141-2 and not SAEJ1850 
interface 'cos only pins 3 thro 7, 12 and 16 have physical 
contacts)...Note the SuperTuner.2001 looks interesting.

- Anybody else know how to do it ?.

- I guess my real quest is how to get a 1996 GM2litre 16V to run fully open loop 
for performance reasons only.  The CAT can be put back when returned to 
road use.  In the UK Group N ECU's were available (189bhp) for 
pre-CAT early (non-EcoTech) 16V units, but not for later ones.

Martin
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martin at mgass.demon.co.uk
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