Buzzing Sound Under the Hood?

With the engine off, but the key on, is there supposed to be a buzzing sound? Not sure where it is coming from in the engine bay. Before I crawl in there, thought I would ask here first.

 

OK, crawled in there and the sound is coming from the throttle body

 

Odd, might double check the grounds are nice and clean and corrosion free. There's 3 of them on the 3.4 I think

 

I dont think they do anything, all 3 were disconnected on my buddies truck connecting them made no difference obviously going to leave them connected because why not have it right

 

Being an 04 you have the god forsaken electronic throttle body

I hate it cause ive had both the cable and electronic one the cable one is soo much more fun to drive

 

The TB has a cable/pulley for the throttle control. Looks like there are a couple of sensors. One is I believe the IAC, but note the engine idles fine and there are no fault codes being generated. The other may be the TPS?

 

No sir its electronic

all the cable is for is to link the tps to the pedal, from the tps, it goes to the ecu, from the ecu it goes to the throttle motor

There is no iac the iac is the computer moving the throttle a miniscule amount

 

Here is the TB. I am pointing at the part that is making the noise. I verified it by pulling the connector, which stopped the noise (and threw a fault code, which I cleared with my OBD2 reader/computer thing). So, I take it that it is my throttle motor making the noise. Now, for the $$$ question - does Toyota sell this? Looks like a new TB is like $500.

 

Most fly by wire throttle bodies make that sound. TPS style cable driven throttle bodies do not. If you are experiencing that with a cable driven TB, that is typically a sign of impending failure and you should think about replacing it relatively quick like.

 

Actually i know what noise youre talking about i hear it when the keys on the on position