Air Intake Boot Hose Connection?

Those look like the PCV hose connections. They are both fresh air intake hoses, one should go to each side of the engine. The smaller right angle fitting is for a small hose that goes from it to a fitting on the throttle body. Looking at it I think someone connected the outlet directly to the TB with the "pink" coupler. I've seen similar things when people add a catch can to the PCV system. It doesn't help and in fact can damage the seals on the engine by having a constant vacuum inside the engine instead of the controlled amount through the PCV valve. The image is for the system. They used a couple set-ups depending on the emissions type.

Thank you, Steve. My 2000 Mazda MPV has the California-emissions configuration.
There are three air ports on the rubber intake boot: one upper port and two side ports (marked blue and green in my picture above).
I am considering two possible options:
Keep the current T-connector configuration on the upper port and seal the small “blue” side port.
Or, as I outlined above:
Replace the T-connector on the upper port with the OEM-style 90-degree elbow.
Keep the hose that currently runs toward the front of the engine connected to the elbow.
Connect the hose that currently runs toward the rear of the engine from the T-connector to the small side “blue” port on the intake boot.
Either configuration would eliminate the open port and prevent un-metered air from entering the intake system.
Thank you again for your help.

Mike

The CA version uses the same lines there but it has a control valve in the PCV line. I wouldn't leave that connector in place as it will apply excess vacuum to the crankcase. The larger ports both go the engine as filtered air for the PCV system, The line off the 90 angle is the PCV line that the engine sucks the gases into the engine through.

Thnak you, Steve.

Please use 2carpros anytime

Here’s what I tried:
I replaced the T-connector on the upper port with an OEM-style 90-degree elbow and kept the hose that currently runs toward the front of the engine connected to the elbow. I then connected the hose that currently runs toward the rear of the engine from the T-connector to the small side “blue” port on the intake boot.
Unfortunately, this configuration did not work. I started the van and drove it for about 20 minutes, and everything initially seemed fine. However, when I returned home and let the van idle, the RPM stayed around 2,000.
After thinking about it more, I also believe the chance that the garage I previously used changed the original hose configuration is fairly small. So I decided to reinstall the T-connector and reconnect the hoses the way they were before. I’m still not sure why the OEM diagram shows a 90-degree elbow while my van has a T-connector.
The remaining question is what should be connected to the blue port. I did not want to leave it open, so I temporarily sealed it with electrical tape.
I have driven the van several times over the past few days, and everything seems to be running normally with no check-engine light or fault codes.
I also stopped by my local Mazda dealer. They checked the diagram and said there should be a hose connected to the blue port, and it may have dropped down somewhere. I searched the area many times but could not find any loose or unused hose. The dealer also told me that leaving the proper hose disconnected from the blue port may not trigger a check-engine light, but it could cause the van to use more fuel. For now, I plan to leave it as it is. It does not seem worth removing so many components in that area just to search for a hose that may be buried underneath.
Thanks again for your help.

Thanks for the update. The lines may have been changed earlier in the cars life. Hard to know for sure. But if you are happy with it then it's your call.