Our 2UZ-FE wiring harnesses are custom-built to seamlessly integrate into automatic applications, ensuring full ECU functionality while removing unnecessary emissions-related wiring. The starter section is separate from the main engine harness, and required modifications depend on the original vehicle the harness came from. Fortunately, 2UZ harnesses are highly durable, usually requiring only minor connector replacements.

To convert your 2UZ-FE engine harness into a fully standalone system, we require:
✔ The primary engine harness
✔ The sub-harness (starter and knock sensor sections)
✔ The ECU

✅ Comprehensive Cleaning & Preparation

• The process begins with a thorough cleaning to remove dirt, oil, and debris before modification.
• The harness is fully disassembled, allowing us to:
  ✔ Retain full transmission wiring for compatibility with your automatic setup.
  ✔ Remove unnecessary unrelated wiring, including:
  • EVAP system wiring (where not applicable)
  • Secondary O2 sensor circuits (where not applicable)
  • Brake light switch, vehicle speed sensor, fuel resistor circuits, and other non-essential connections

✅ Starter Harness & Wiring Integration

• The starter sub-harness is modified to properly connect with the main engine harness, ensuring full control over the starter solenoid and knock sensors.

✅ Fuse Box & Client Plug Installation

• A fuse box is integrated into the harness for standalone operation.
• Instead of ECU-to-body plugs, we provide a client plug that allows for simple installation into your vehicle, much like wiring in a car radio.
• The client plug includes:
  ✔ Essential engine start-up signals:
  • Fuel pump power
  • Start signal
  • Ignition signal
    ✔ Dashboard signals:
  • Rev counter (tach signal)
  • Temperature gauge
  • Oil pressure signal
  • Charge light (alternator warning)
  • Check engine light (CEL)
  • A/C compressor clutch activation

✅ Automatic Transmission Client Plug for Gear Selection & Cruise Control
For automatic transmission applications, you will receive a second client plug, providing:

✔ Gear selection signals for a 5-speed transmission:

• Park (P)
• Reverse (R)
• Neutral (N)
• Drive (D)
• 4, 3, 2, and Low (L) positions

✔ Cruise Control Wiring (3 wires):

• One wire for the cruise control lever
• Two wires for the brake light switch:
  • One powers the cruise control system
  • One signals the ECU when the brake is applied

✅ OBD2 & Accelerator Pedal Support

• Every 2UZ-FE wiring harness includes an OBD2 port, allowing for live data diagnostics and programming.
• Most 2UZ setups use an accelerator pedal extension, which we supply for a plug-and-play connection to your pedal.
• Some 2UZ-FE harnesses do not require an extension, as they utilize the accelerator position sensor on the throttle body—this will be confirmed during the process.

✅ ECU Flashing for Application-Specific Setup ($140)

• The ECU is configured specifically for your swap application, ensuring that irrelevant trouble codes are removed.
• This includes:
  ✔ Manual application: Removes automatic transmission-related codes.
  ✔ Automatic application: Retains transmission functions while removing non-essential codes (e.g., vehicle speed sensor not being in the original chassis).
• This does not affect engine performance but prevents unnecessary check engine lights related to missing components.

✅ Immobilizer Removal ($140)

• All 2UZ-FE ECUs have immobilizers, except those found in Tundras. If you are not using the original immobilizer system with its key and transponder, the immobilizer must be removed for the engine to function properly.

✅ Performance Tuning for Throttle Response & Power (Included with Flashing)

• As part of the ECU flashing service, we apply a performance tune that:
  ✔ Significantly improves throttle response
  ✔ Enhances overall engine performance
  ✔ Optimizes fuel and ignition mapping for better drivability

💰 💡 Pricing details are available on the client form.

Before we return your completed harness, we:

✅ Install it onto one of our test engines to verify proper functionality.
✅ Run a full diagnostic scan to ensure there are no error codes.
✅ Record a complete walkthrough and test-run video to document the harness in action.
✅ Provide a shared client folder, which includes:
✔ Test-run video
✔ Harness photos  (if applicable)
✔ ECU calibration details (if applicable)
✔ A welcome pack with installation notes
✔ Shipping & tracking information

📌 You will receive the test-run video and documentation before you are invoiced.

⏳ Turnaround time depends on current shop workload but generally ranges between 1-2 weeks.

📌 Clients must complete a Client form to accompany their harness, specifying:
✔ Vehicle details
✔ Transmission setup
✔ ECU specifications
✔ Preferred wiring options

📦 Shipping Information
We strive to keep our pricing as affordable as possible, but return shipping must be covered by the customer.

• Return shipping costs will be calculated based on your location and package size.
• This cost will be added to the final invoice before shipping your completed harness.

For more information or to discuss your 2UZ-FE swap, feel free to contact us via email or our contact page.

An example of what you will receive in video:

  Wired 2UZ-FE for an engine swap. Non VVT-i with Automatic transmission and transfer case control - YouTube