P2443

Hi all, looking for some specific info for a DIY fix.
2008 Tundra SR5 4.7L
Throwing a P2443 code.

I had one of these codes (I don't remember which, P2440, P2441, P2442, P2443) show up a couple years ago and had the valve and pump under the right fender replaced by a local shop. That seemed to fix it for a while. Had one of these codes show up again this past winter and a friend recommend that I should replace the pump and valve under the intake manifold myself. Stayed fine until a few weeks ago, the P2443 code is back.

Questions:
1. which bank does this indicate, the one under the intake manifold, or the one under the wheel well?
2. is this code telling me the valve is bad, the pump is bad, or both?
3. how can i diagnose the problem to determine if it's the pump, the valve, or something else like a sesor?

 

https://youtu.be/lwCN839zMl8

 

..... and make sure you watch the other associated YouTube vids to get the full picture....

 

180,000 miles, so out of warranty. I've watched quite a few videos, and I've actually already replaced the driver's side valve and pump myself, so i'm reasonably familiar. Trying to find out more, because I'm reading it might not be the valve or pump, but a pressure sensor? How do I check for this??

this video is for the 5.7. The valves are next to each other, the pumps are under the wheel well.
I have the 4.7. The valves are above the spark plug banks, one on each side, next to the intake manifold. One pump is under the right fender, one is under the intake manifold. Exhaust pipes don't have to be removed...

When my mechanic replace the passenger side pump, valve, he told me about the water intrusion and *I THINK* he said he added the trumpet reconfigured part to avoid more water intrusion.

I just googled more:
* Bank 1 is driver side, Bank 2 is passenger.
* P2440, P2441 relate to bank 1
* P2442, P2443 relate to bank 2

 

In the name of documentation, I'll add this information:
Toyota OEM Stock numbers are as follows. The bank numbers qualify as "i'm pretty sure."
Bank 2 -- PUMP: 17600-0F010 VALVE: 25710-50030 (passenger)
Bank 1 -- PUMP: 17600-0S010 VALVE: 25710-50040 (driver)

TROUBLESHOOTING:
a) I removed the inner fender cover and removed the pump. I put 12V across the connector and it pumps air. I'm assuming that isn't the problem. Also noted the inlet cover to prevent water intrusion was in place, from previous repair by local shop. I observed no water in the hoses or in the pump.
b) I removed the valve and split it. I don't see anything obviously wrong. No idea how to bench test, would rather not replace it if it isn't a known defect.

What's next??

 

Look closely at them videos again. There is one I watched awhile back where the guy cleaned the unit after he removed it from the truck.

He seemed a bit confident that him cleaning the unit resolved the issue.

Hola if you did see this vid ....

 

I'm coming to the conclusion that it's neither the valve nor the pump. perhaps a fuse or relay?