ORS 3RZ-FE (2.7L) Conversion Wiring Harness, for 3VZ-E and 22R-E Vehicles

(1 customer review)




Please see the ‘notice’ and ‘core connectors’ information located below description before ordering.

The ORS Conversion Harness greatly simplifies the electrical portion of the 3RZ-FE or 2RZ-FE engine conversion.

The wiring is possibly the most complicated part of a 3RZ-FE engine conversion. The 3RZ-FE / 2RZ-FE (2.7L or 2.4L) fuel injection system is entirely different from that of the older Toyotas. This means the 3RZ electronics will have to be in installed in your older Toyota in order to make this engine swap possible. Unfortunately, the electronic EFI components from your older Toyota 3VZ-E or 22R-E will be useless in this swap.

There are 3 primary parts of this OEM 3RZ fuel injection circuit. The first is the engine wiring harness. This is the harness that is primarily attached to the engine. This is sometimes called the injector harness. This harness connects the engine components such as the fuel injectors, ignition coils, air flow meter, etc. to the engine computer and the body harness.

The second part is the Engine Control Unit, or ECU. This is also called the Engine Control Module, or ECM. Sometimes it is just called the engine computer. This is the heart of the fuel injection system. This maze of solid state circuitry uses various input signals and outputs to control the engine.

The third part of the 3RZ electronic fuel injection circuit is the body harness. This is sometimes called the “dash” harness or the “main” harness. It stretches across the inside of the dashboard and sometimes into the engine bay. This harness is the largest harness in the vehicle and carries the majority of the vehicle’s circuits. About 40% of the 3RZ fuel injection’s wiring circuit is contained in this harness.

The engine wiring harness and ECU are easy to install in another vehicle when performing this swap, but the real challenge comes about when it’s time to take care of that last 40%. This is where ORS Conversion Harness comes in. Our conversion harness is designed to provide that last 40% of the 3RZ fuel injection wiring circuit. This harness connects directly to the 3RZ ECU and engine wiring harness; then plugs directly into your older Toyota. The original wiring in your older Toyota will not have to be torn apart or changed in order to accommodate this new engine. The ORS Conversion Harness will also include the necessary emission equipment wiring for your application. Additionally, this harness is designed to accommodate your OEM gauges (tachometer will require some additional work during the install), speed sensor, reverse lights, 4×4 system and 4×4 indicator lamp. The installation is almost entirely “plug-in”, with only a small amount of splicing required.

The alternative is to re-wire your entire vehicle with a newer body wiring harness. The ORS conversion wiring harness is designed save you an enormous amount of time and potential trouble.

This product is built per order, please allow 1-2 weeks for order completion.

“Donor Vehicle” options refer to the engine harness application.

Notice when ordering: Please include the following information in the “Order Notes” box when placing your order:

From Donor Vehicle:

  • VIN, only if 100% certain of engine origin, OR-
  • Toyota ECU and engine harness part numbers (8966x-xxxxx & 82121-xxxxx)
  • Model Year
  • Model
  • 4WD or 2WD
  • Manual or Automatic Transmission

From Your Vehicle:

  • VIN
  • Year Model
  • Model
  • Original Engine
  • Manual or Automatic Transmission (originally)
  • Indicate specific transmission to be used in conversion
  • 4WD or 2WD
  • If using 3.0L version of Auto Transmission, indicate transfer case to be used
  • Suspension type (original or modified)
  • For 89-95 Truck, 90-95 4Runner, Indicate if ADD (Auto-Hub) system is in use

Core Connectors:
For some applications we will need core connectors from you. If your vehicle is an ’85-’90, we need two connectors. These are on the 22RE or 3VZ-E ENGINE harness, behind/near the ECU connectors. They are the 2 connectors that join the engine harness to the body/dash harness. Cut them from the ENGINE harness w/ 1-3″ of wire lead. Note, we will fill w/ new wire terminals. We will send a label for a small flat rate box through USPS.

1 review for ORS 3RZ-FE (2.7L) Conversion Wiring Harness, for 3VZ-E and 22R-E Vehicles

  1. Zach Ogle

    I cant say thank you enough! Harness came out of the box and looked b-e-a-utiful! It looked extremely professional and was easy to install. A hell of a lot easier then figuring out the wiring on my own. I would recommend this to anyone during a 3RZ conversion. No old school Toyota should be without a 3RZ.

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