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Does DBW use IAC?

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Old Oct 7, 2020 | 08:52 PM
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Default Does DBW use IAC?

Hello,

Swap: 2004 Avalance LY7 (Green/Blue ECM) 4L60E
Vehicle: 1978 Caprice

My engine setup is mostly just a stock swap. On the LT1Swap website, the pinouts for a 2004 Chevrolet show 4 pins (Green 76,77,78.79) for the IAC. I don't see the IAC on any of the wiring diagrams listed for that year. My engine/harness came DBW. Does DBW not have an IAC? Is IAC only used for DBC? I don't have these wires listed in my notes from when I made my harness. Is it possible my harness doesn't have these wires? I cannot remember.

I tried to paste my spreadsheet, but it won't accept the format.

Pin 76 - Green/White - IAC Coil B High - IAC Bin B - Yellow
Pin 77- Green/Black - IAC Coil B Low - IAC Pin A - Green
Pin 78 - Blue/Black - IAC Coil A Low - IAC Pin C - Blue
Pin 79 - Blue White IAC Coil A High - IAC Pin D - Purple


Thanks,
Brandon



Last edited by Vetteman61; Oct 7, 2020 at 09:00 PM.
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Old Oct 7, 2020 | 09:00 PM
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DBW doesn't use an IAC, it just opens the throttle body to compensate.
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Old Oct 7, 2020 | 09:07 PM
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Brandon - idle air flow is controlled by the electronic throttle itself. No idle air bypass needed.

I think....
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Old Oct 7, 2020 | 09:21 PM
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Originally Posted by Michael Yount
I think....
You think correctly.... no IAC w/ DBW
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Old Oct 8, 2020 | 08:10 AM
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Thank you
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