Wiring Connector Mismatch – 2009 5.7L Engine in 2012 Tundra

Hi everyone,


I recently swapped a 2009 5.7L Tundra engine into my 2012 Tundra. Mechanically everything fits fine, but I ran into a wiring issue with two connectors.


The sensors themselves are the same type, but the connectors are different:

• My 2012 harness connectors have 4 wires (2 thicker, 2 thinner – colors: blue, black, pink, and white).
• The sensors that came on the replacement engine have only 2 wires (blue and black).

This mismatch is causing the connectors not to plug in, and even if I modify the plug, the 2-wire sensors obviously don’t have the extra two signal wires my 2012 ECU expects.


My questions:

1. Can I simply swap the sensors from my old 2012 engine onto the 2009 block to make the connectors match, or is there a year-specific difference internally?
2. If I can’t get my original sensors, is there a safe way to wire the extra two leads to make the 2-wire sensors work with the 4-wire harness?
3. Does anyone have a 2012 5.7L throttle body/TPS wiring diagram so I can trace these wires back to the ECU?

I’ve attached photos showing the connectors on the engine and the vehicle harness for reference.


Thanks in advance for any advice — I’d like to get this sorted so the truck can be back on the road.

 

Blu/black should be for the Aip pump 1 or 2 up under passenger fender. Should have black/red for other on the fwd side of psngr head. Which go back to the SAIS drivers. Wasn't aware of a change for the aip wiring. Look at 2012 vs 2009 aip wiring?

 

Thank you for answer. Could someone on here upload the 2009 vs 2012 Tundra 5.7 AIP wiring diagram? I’m trying to trace the AIP pump connector differences.”

 

You can find electrical wiring diagrams in the Electrical forum.
https://www.tundras.com/threads/ultimate-tundra-wiring-diagrams-collection.81448/