3UZ-FE Standalone Swap Harness + Live Test Run OBD2 Scan

To help you complete your build with confidence, we’ve created a detailed engine-installation video—showing exactly how to fit the 3UZ Lexus V8 Custom Standalone Harness onto the engine itself.

In this video you’ll see:

• Plug-and-Play Engine Connection – how to route and secure the harness cleanly around the 3UZ VVT-i engine and connect every sensor, injector and coil.
   
• Cab-Mounted ECU Placement – recommended location in the glove box (or similar protected cabin area) for easy access and long-term protection.
   
• Professional Securing Tips – how to clip, tie and protect the loom for a factory-quality finish.
   

Note: This guide covers the engine-side installation only. Final connections to the vehicle—ignition feed, fuel-pump trigger, starter signal and instrument-cluster outputs—are completed by the installer using the supplied pigtail.
 

👉 Watch the video above to see how simple it is to install the harness on either 5-speed or 6-speed manual applications, for left- or right-hand-drive vehicles, and prepare your 3UZ engine for a clean, reliable start-up.

To give you complete peace of mind, we finish every build with a full test run and diagnostic scan of the 3UZ Lexus V8 Custom Standalone Harness before it leaves our workshop.

During this final check you’ll see:

• Clean First Start – the harness powers the 3UZ VVT-i engine from cold, proving true plug-and-play engine operation.
   
• Complete OBD-II Diagnostic Scan – live verification of all sensor readings and confirmation that no fault codes are present.
   
• System Verification – every key circuit—fuel, ignition and ECU communication—is tested to ensure the harness performs exactly as designed.
   

Note: This demonstration focuses on the harness itself. Final vehicle-side connections (ignition feed, fuel-pump trigger, starter signal and instrument-cluster outputs) remain the installer’s responsibility and are completed via the supplied pigtail.
 

👉 Watch the video above to see the 3UZ harness deliver a flawless first start and pass a comprehensive diagnostic scan, whether for 5-speed or 6-speed manual applications, in left- or right-hand-drive vehicles.