Auto APPLICATION 1UZ VVT-i WIRING

 The 1UZ VVT-i engine is an excellent upgrade from the 1UZ non-VVT, offering significantly more power. We specialize in converting the OEM harness on these engines to facilitate easy installation into any vehicle.

Our process begins with a thorough cleaning and inspection of the harness. During this stage, we remove any additional wiring that is not required and add any necessary components not present in the stock harness. We then inspect and replace, where necessary, the harness split tubing, which can become brittle and break over time.

We incorporate a fuse box into the harness and route the wires that used to go into the original body through the harness, creating a unified standalone system. This system includes a single connector with a pigtail for the client to connect to their vehicle to get the engine running. This connector, referred to as a client plug, consists of three wires essential for the operation of the engine: Ignition, Start signal, and Fuel pump power supply. The same connector also provides dashboard signals such as rev counter signal, engine temperature, charge light, and oil pressure light. Depending on the original harness sent in for modification, you may also receive the air conditioning compressor electric clutch trigger.

For automatic configurations, you will receive an additional client plug dedicated to the transmission functions. This plug includes Park, Neutral, Drive, Overdrive, three, two, and low. As an automatic, we also wire in your cruise control as a standard, whether you use it or not. With the 1UZ VVT, you will have an OBD2 port built into the harness, allowing you to read live data and check diagnostics on your system. This is a valuable feature to have in your system.

We charge a base price of $690 for a 1UZ VVT automatic configuration. This price is solely for the wiring modifications and does not include connectors or immobilizer bypass. Connectors vary from harness to harness and can’t be calculated until the harness has been inspected. They vary in price but on average run around $6 per connector installed.

The immobilizer has an additional cost of $90 to be removed from your ECU.

Once the modifications have been made to the harness and ECU, we install your harness onto one of our test engines. We create a walkthrough and test run video for your records, as well as a welcome pack, client plug pinouts, and images of the harness, along with shipping information. This is shared with our client through a shared folder link. This gives everyone peace of mind that things have been done correctly and there can be no mistakes on the system. We take great pride in our work and hope it will bring pleasure to our client for many years to come. Please refer to the “1UZ VVT-i OEM ECU Reliability” section for more information regarding the ECUs in these systems.

An example of what you will receive in video:

  1UZ VVT-i Automatic Application Test Run Video (youtube.com)