Idle air control valve wire diagram needed?

Hello, it sounds like you're absolutely right, if the IAC is not powered up the ECM will have no control over the idle. The power supply (12v) is actually the same one that powers the fuel injectors, it's a red wire, I will pull up a diagram, but if this happened when you did some more work, there might be a pinched wire somewhere.
With a 12-volt feed it's probably a pulse width modulated circuit on the ground side for control. So, with a node light you would see a pulse.
Another thing to think about, is if you unplugged the main bulk connector at the firewall going to the ECM, the ground wire that controls the IAC might have a pin fitment issue at that bulk connector and it is not reaching the ECM, trace back the work you did and check the connector to make sure there is a good connection to the ECM. It looks like the control wire is White/Light Blue stripe.
I added the OEM diagram too, just to verify wire coloring. They are the same, Also the bulk connector, pin 39 is the ground side control wire for the IAC. White/light blue wire.

https://www.2carpros.com/articles/how-a-idle-air-control-valve-works

Can you repost your question please, it did not come through. Try not to use any keyboard symbols, they can cause a post to be erased.

Okay, the Intake Air temperature sensor will have a 5-volt reference on the grey wire and the other wire is a shared ground, but not with the IAC. The ground for the IAC goes to the ECM. When you check the Intake temperature sensor you need to have it unplugged with the key On. And the grey wire should read 5 volts. It will be lower plugged in because that's how the ECM reads the temperature by monitoring the voltage drop on that grey wire. So, it needs to be unplugged to test for voltage.

Thats good news, glad it was only a wiring issue, pin issues happen a lot after so many years of heating up and cooling off, the plastic expanding and contracting. With low voltage issues I usually don't touch connectors and wires until the problem area is isolated. I hear about modules being replaced so much over a bad wire or ground, sometimes going back to the basics helps a lot. I see a few pins there that look like they might have some corrosion on them, they sell terminal cleaners you can try spraying in there to clear that up. Deoxit Terminal cleaner seems to be the best. You can spray it right into the connector and it will clear up any corrosion. Saves you from future headaches.

What diagrams are you looking for, something like the complete engine block diagram? We use a paid service called All Data and Mitchell1(Pro Demand) for our wiring diagrams and information. It would be too much to post the entire trucks diagrams, it would be over 200 pages. It's divided up by systems. So, under Powertrain management I can give you the entire engine computer diagrams with all the sensors. And in future if you happen to need diagrams for anything else, just come on here and ask. The powertrain ones I can do, it will be 8 pages, each main page split in half so you can see it close up.

Here's the entire engine to ECM wiring diagrams, pages 1 and 2, if you print them out you'll see they go together. And 3 and 4 and so on. If you need any other specific diagrams in the future, just ask and we can pull them up. These are the aftermarket ones; they are much easier to read than the OEM ones.

They are already in my last post, you might need to refresh the page in a few minutes.

Okay, that might be an aftermarket diagram issue. They are not always perfect. If there anything else about this F150, I see there is an F150 2wd Lightning, f150 2wd pick up, an F150 super crew 2wd. All have a 4.6-liter v8 engine. I'll go through and see if there's any difference, I'll take a look at the OEM as well.
Oh, one other thing, that c133 connector is not the ECM connector, it is just that bulk connector. The ECM pin I'm seeing a white/light blue wire going to pin 83 on the ECM is IAC control.
I know the aftermarket diagrams don't show every connector on a block diagram.
Here is the IAC connector too if you need that.
The 4th diagram shows where the c133 bulk connector is. Let me know if you're good.

Okay, this is c133 for the 2002 Ford F150 Super Crew 2wd 4.6l v8. It's pretty much the same, you might notice some difference, but I can't really find a list of what every single wire in this connector goes to. I'm going through the OEM (Ford) engine diagrams, which are there are about 40 pages of. This connector is all going to be engine components, powers and grounds, sensors, etc. Mostly anything running to the ECM from the engine compartment. There are 33 pins used up in the connector, I'll go through and try to find out which each pin is for, but to do that I'll need to search through all the 2002 Ford F-150 4.6L V8 2WD Automatic 215,000 miles engine diagrams. Which I don't mind doing if you're still having wiring issues. It will just take a while. Unless you want to make a list of the pins you need to know.
But on the aftermarket diagrams, where the pages change and there's a number there, that number doesn't mean anything. It's just to help you trace the wire to the next page. For example, that number 29 you mentioned has nothing to do with ECM pins or connectors. Thats just a number listing the wiring from page to page. But the IAC control is pin 83 on the ECM. I can give you the OEM connector for the engine computer that does list each component. I'll post that next. It gives pin number, wire color and component name. It should be helpful. I'm just Al btw. Nice to meet you. Give me a couple minutes and I'll have the ECM connector up for you.

Okay, diagrams 4, 5, and 6, are the PCM connectors and every wire to it. It looks like it's a 1 connector at the PCM.

Okay, connector c133
Diagram 1
pin 41 is Cylinder number 2 ignition coil control wire.
Pin 34 is the power feed (12v) for all the ignition coils and ignition capacitors for noise suppression.
Pins 26 is coil 1 control,
pin 32 is coil 3 control,
pin 33 is coil 7 control.

Diagrams 2 and 3,
pin 35 is a ground shield for the crankshaft position sensor also splices at s199 and s100 for additional ground shielded wires.

Diagram 4,
pin 20 Fuel Injector 7 control
pin 21 fuel injector 8 control

Diagram 5,
pin 5 Cylinder head temperature sensor (5 volt) reference feed
pin 27 Intake air temperature sensor (5 volt) reference feed

Diagram 6
pins 7, 8, 13, 14, 15, 19 Fuel Injector (1 to 6) control wires
pin 39 Idle Air Control valve control wire white/light blue to pin 83 at PCM connector
These are all OEM Ford diagrams.