P0A0F and P3190

I have a 2004 Prius with 215,000 miles on it. It recently shut down and threw the P0A0F and P3190 codes at me.
The car had been running fine for quite a while, then my check engine light came on. I plugged in the techstream, and while I was plugged in, it displayed the red warning triangle, which I can link to the P0A0F.

The original codes, before the warning light flashed on, were

• P0172
• B1421
• B2775
• B2795
• C2318

Once I had reset these codes, I have consistently been receiving only the P0A0F and P3190.
After reading through what I could find on PriusChat, I have done the following:

• Sprayed clean the MAF sensor
• Cleaned the throttle body
• Replaced the MAF sensor
• Put an extra 2 gallons of gas in (although the meter still has three bars on it)
• Checked to make sure the oil isn't too full (it's halfway between the min and max indicators).

As far as what's happened recently, I have very recently done an oil change. But like I said above, the oil is reading halfway between min and max currently.
I'm about out of ideas on what to try next, short of replacing the whole fuel tank. Any ideas?

 

Just swapped out all four spark plugs. Looks like it was time for them to be changed anyway. However, still having the same issues.

It looks like I can do some tests with the fuel pump on Techstream. I've got the battery charging up again right now, so I'll try that in a little while.

I noticed that if I turn the car on and put it straight into drive or neutral, that the engine seems to run fine. I'm a little nervous to take it out of the garage, though, so i've just been idling not in park. The engine will run longer and sounds healthier when I do that, but still not in great shape, and still shuts off and throws the codes again.

 

So there is a way to manually turn on the fuel pump with Techstream. Manual said to listen to hear if it activates. I heard it turn on, although I'm not sure exactly what to listen for. But there is something distinctly turning on and off as I toggle it in techstream. Here's some screenshots.

 

I towed the car to the Dealership. They ran their tests, and are 100% positive that the issue is a bad throttle body. They said that it's not responding to the techstream when they try to activate it.
They want $1200 in parts and labor! I asked how much it would be if I brought my own part, and they still want $488 for labor. I think I can get the part for less than $100 and do it myself.

Any tips on replacing a throttle body? I saw on one video that the electronics need to be calibrated upon installation. How would I go about that?

UPDATE: Got it towed back from the dealership, and replaced the throttle body. Ran some tests in Techstream and watched it open and close just fine. However, I'm still getting the same issues with low power and failure to start. In fact, the engine is starting up the same way that it was before I replaced the throttle body.

I don't know what else I can try...

 

Well, we've been saving for a newer car for a while now, and I'm stumped on this issue. Seems like it should operate fine, but I can't get past this problem. I'm going to post it for sale, in case someone does want to take a whack at fixing it. It runs pretty well, if you can get it past this.

Posting a better description in the Prius Cars for Sale thread.

 

I remember, when swapping out the Throttle Body, there was some gunk down in the intake manifold. Is that difficult to clean? Can I just reach down there with a rag and wipe up what I can reach? Could that actually make any difference?

 

Throttle body itself seems fine. I really don't think that specifically is the issue, especially since I've already tried cleaning it and replacing it.

Looking past the throttle body, there's a lot of residue in the intake manifold. Last night I removed the throttle body to get a better opening into the intake manifold. I used a paint stick and an old t-shirt and just scrubbed up as much of the residue that I could. There was quite a bit. Then I put a little bit of seefoam to help break up the rest of it.

When I restarted the car, it ran for much longer than normal before it threw codes again. It still didn't sound the healthiest, still low RPM and some knocking, but the longer it ran, the better it sounded. It did smoke a lot, but that's probably just the seefoam speaking. It freaked me out a little before I realized it was probably just the seefoam, so I'm going to do that a few times tonight again, try and burn up the rest of that, and really get that intake manifold clean.[/QUOTE]

 

Sounds good. I'll try tonight when I get home from work, and I'll post the results.

 

No luck last night. Threw a little bit more seefoam in the intake manifold, dumped the rest into the gas tank.

Only reason the car was running for longer bust be because of the seefoam directly in the manifold, because before I put a little more in there, I got the same reaction I had been having, of the car just shutting down quickly after being turned on.

So, in other words, no progress. Still broken.

 

I didn't get around to checking the relays. I did just sell the car, so I will no longer be attempting anything on it.