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2UZ Swap Sequoia vs Tundra ECM harness question

ForestRunner

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Joined
May 20, 2025
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5
I have a 2003 Sequoia with two dead cylinders (#1 and #4) and I'm planning to use a used 2002 Tundra 2UZ engine as a replacement. The only thing I noticed is that the Tundra has 5 ECM plugs while my Sequoia has 6.

Has anyone dealt with this before, can I just swap my Sequoia harness onto the Tundra engine, or will I have sensor problems?
 
Yep, you can swap your sequoia harness onto the tundra engine same block, just differences in wiring and emissions.
 
That ECM plug difference worries me, you might run into sensor compatibility or wiring issues, swapping your Sequoia harness could work, but double-check all sensors and connectors match first
 
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