747 wiring questions.

[rrauscher at nni.com]

Not sure about the ccp, I've never seen anything in the code
for it. There is stuff in the code for air divert.

The A/C input is to be driven high on. I wired mine to the
compressor clutch. This is mostly used for idle and IAC
control. The ecm can change the desired idle rpm for A/C
on/off. There is some transient map filtering also. There
appears to also be a way to wire the A/C clutch so that the
ecm controls it. I haven't quite figured that part out yet.

The above is for '747 stuff.

BobR.

>OK, 747's been grafted into the crossfire injection system for a while now

>and running fine.
>A couple of smog wires left over, but not a biggy, figured I'd figure it out

>later.
>Anyway, I'm re-going thru a book on Chevy fuel injection and it list a
>pinout for a 4.3 with designation "Z" (1227747?).
>Anyway, it list  A3 (not used in GM my pin chart) as canister purge and C1

>(also not used in my chart) as Air diverter solenoid.
>The question is, does GM have functions in all 747s that if not used are
>just not wired? If I wire it presto bango do I have my smog stuff back(like

>I want it :-) ). I know the Non A/C P/U I got my pigtail from didn't have an

>A/C wire, but I assume (?) if I grounded that terminal that the ECM would
>adjust the fuel and timing etc as if I did.
>
>Kevin R
>
>
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