School me.

[vortecyota]

I think I should simplify my questions.

What are all the differences btwn the red blue and green blue pcms.

Can either be used with a cable or tac?

What are the options for alt wiring?

[farmtruc]

The blue and red connector harnesses are 99-02 and you should use that year pcm.
The green and blue connector harnesses are 03+.
You shouldn't try to swap between the two with pcm's.

[vortecyota]

Thanks, can the green blue pcms operate an IAC? Can the red blue pcms communicate with a TAC module via serial data? I do have a tuning software suite and can load the proper os and cal.

What exactly are the differences btwn the two pcms? Is one exclusively 512k?

For example, if I wanted to convert a blue green DBW harness/ pcm to DBC, can I keep the pcm and just rework the harness or would I have to use a 99-02 pcm?

Vise versa, could I use a red blue pcm in a DBW application?

What about alt wiring? How many different schemes are there?

[farmtruc]

Some of the '03 and I think '04 express vans used the mechanical throttle body, that is one vehicle that is an exception to what I stated above, but I'm not sure what pcm service number they use.

For the general rule, no, don't flash an '05 calibration into a 2002 pcm, weird things happen. They have different hardware internally.
You can convert the dbw harness to a cable operated one, but use a 2002 pcm.

[vortecyota]

Cool, so red blue pcm = DBC. Green blue pcm = DBW.

I will keep this advise, thanks!

Now can you or someone school me on HO2S variances. Is it just case grounded or not case grounded and wire them accordingly? Are they specific to early( not case grounded) and late( case grounded)? Anything else?

Alt variances?

Thanks a million for your time, I know you are a VERY busy man!

[farmtruc]

You'll have to look up each harness by vin to know exactly how it's pinned out, just to be sure, but 99% of the time when we do a cable operated throttle body 99-02, they are case/chassis grounded.
The newer trucks/cars 05+ seem to be pcm grounded.
Just a general observation, it's not the rule.
Almost all the 2002 and earlier use the one wire , flat connector.