Wiring Diagram for 3TC-TE.

If you are intending to bypass the anti-theft, start thinking about 'Plan B', because it seldom works.

https://www.google.com/search?q=Toyota+Avalon+ECU+immobilizer+wiring+diagram

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Question edited for clarity 'wine diagram'.
Question moved to model category.

For full wiring diagrams, there is usually a cost. You will find part diagrams if you Google

2006 Toyota Highlander (the part) wiring diagram

https://www.google.com/search?q=2006+Toyota+Highlander+V6.+wiring+diagram

Oxygen sensor wiring

https://www.google.com/search?q=2006+Toyota+Highlander+oxygen+sensor+wiring

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I am not familiar with the model. Single point injection would normally inject almost continuously and if the wiring diagram was checked it would probably show the injector power comes direct from the same supply as the ECU uses and the ECU will provide the ground path if the ECU (ECM) is good and is receiving the correct data from the various sensors.
This provides possibilities: -
Bad ECU.
Bad wiring.
Insufficient information from sensors.

If there is an immobiliser it is worth checking it is properly disarmed.

Find free wiring diagrams

You need to go to eBay and try to find the wiring diagram or contact dealer on your area. I was able to find a wiring diagram in eBay for my classic car a Ford 1979. New no less.

I am sorry but we have no wiring diagrams here fixya.com

We do not have that diagram, you can obtain the wiring diagrams HERE for a small yearly subscription charge

How to read ECU fault codes. 1KZ-TE & D4Dwww.pradopoint.com/showthread.php?...to...fault-codes.-1KZ-TE...Cached

ive undone all nuts, including cam wheel nut but its stuck. the pump turns slightly side to side , but it still seems to be fixed to the cambelt pully. ive tried using a drift on the pump shaft but it doesnt move back