Turn on the normal saute button of the instant pot. When the display screen says hot, add oil, garlic, onions, bell peppers, and corn. Saute for a minute.
Now add salt and taco seasoning. Mix everything well. Add water and deglaze the pot very well.
Add remaining one cup of water, pasta, and black beans. Do not stir but press slightly so that pasta is under the liquid.
Add salsa, spread the salsa little bit. BUT DONT STIR. Close the pot with its lid. Press the manual/ pressure cook button and cook on high pressure for 4 minutes.