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MANUAL APPLICATION 2UZ-FE WIRING

The 2UZ-FE is a durable and reliable engine, making it a great choice for swaps. We specialize in mo

What You Can Expect from Our Service

✅ Complete Harness Modification & Cleaning

We thoroughly clean the harness to remove dirt, oil, and debris before beginning modifications.
The starter section is separate from the main engine harness, so we ensure proper integration.
The sub-harness (starter and knock sensor sections), primary engine harness, and ECU are required for conversion.

✅ Standalone System Conversion

Transmission wiring is removed to simplify the harness for a manual application.
Airflow meter wiring is integrated for proper engine operation.
Unnecessary wiring is eliminated to ensure a streamlined, efficient setup.
The starter harness is modified to connect with the main engine harness, allowing full control over the starter solenoid and alternator.

✅ Fuse Box & ECU Integration

A fuse box is added to the harness.
ECU-to-body plugs are incorporated, creating a unified single harness.

✅ Client Plug for Simple Vehicle Integration
We install a client plug to make it easy to connect the harness to your vehicle. This plug includes:

Essential engine start-up wires:
- Fuel pump power
- Start signal
- Ignition signal
Dashboard signals:
- Rev counter (tach signal)
- Temperature gauge
- Oil pressure signal
- Charge light
- Engine light
- AC compressor clutch activation

✅ OBD2 & Accelerator Pedal Support

The harness includes an OBD2 port, allowing for live data diagnostics and programming.
Most 2UZ harnesses come with an accelerator pedal extension, but some models use an accelerator position sensor on the throttle body instead.

Pricing

💰💡 Pricing details are available on the client form.

Testing & Documentation

Before shipping, we:
✅ Install your harness onto one of our test engines to verify proper operation.
✅ Scan for trouble codes and ensure the harness is fully functional.
✅ Record a full walkthrough and test-run video to provide documentation of your system.
✅ Send a shared folder containing:

Test-run video
Harness photos
ECU calibration details (if applicable)
Welcome pack with installation notes
Shipping & tracking information

This ensures complete transparency and peace of mind, allowing you to install your harness with confidence.

Final Notes

Turnaround time varies based on shop workload. To ensure a smooth process, clients must fill out a form accompanying their harness, detailing their specific wiring needs and contact information.

For further details or to discuss your project, contact us via email or our contact page. We look forward to helping with your 2UZ-FE swap! 🚗⚡

An example of what you will receive in video:

2UZ Manual Wiring Go Through and Test Run Video (youtube.com)

2UZ-FE OEM ECU Reliability

2UZ-FE ECU Reliability & Programming

The 2UZ-FE ECUs are highly reliable and are not prone to hardware failures like older Toyota ECUs. Unlike some earlier models, 2UZ ECUs do not suffer from leaking capacitors or natural physical damage over time.

Common ECU Concerns & Solutions

🔹 Extremely Reliable – But Not Indestructible – While anything can go wrong with an ECU, failures are very unlikely. The biggest complaints are usually related to immobilizer issues, not actual ECU hardware failure.

🔹 Fully Programmable – With Some Exceptions – Most 2UZ ECUs can be flashed and reprogrammed, but some early models, such as those from the Land Cruiser 100 Series, are non-flashable. These units cannot be updated or reprogrammed for tuning or transmission adjustments.

🔹 Easy & Affordable ECU Replacement – If you have a non-flashable ECU, the best solution is to replace it with a flashable unit, which can be found for as little as $40 online. This makes upgrading simple and cost-effective for tuning and future modifications.

🔹 Flashing Options – If your ECU is flashable, you can update it with a fresh file or software update to correct shifting issues, optimize performance, or adapt it to different vehicle applications.

If you require ECU programming, immobilizer removal, or guidance on ECU replacement, we can help ensure your 2UZ swap runs smoothly.

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Additional Information

The Toyota 2UZ-FE 4.8L Engine: Specifications and Reliability

Toyota's 4.7-liter V8 engine, a prominent member of the UZ family, is designed for use in large trucks and SUVs, hence its substantial displacement, low revolutions, and high torque output. Unlike the 1UZ-FE and 3UZ-FE engines, which feature aluminum cylinder blocks, the 2UZ-FE engine boasts a cast iron block—a more durable and cost-effective material. This choice, however, significantly increases the engine's weight. Aside from the increased bore and stroke, the 2UZ engine block shares the same design and dimensions, including a 90-degree 'V' angle, a 21-mm cylinder bank offset, and a bore pitch of 105.5 mm. The engine is equipped with a steel crankshaft featuring eight counterweights and five main journals, as opposed to the six journals of the 1UZ crankshaft, along with forged and sintered connecting rods, and aluminum alloy pistons whose skirts are tin-plated to reduce friction.

Atop the cylinder bank, aluminum heads are mounted. Each head houses intake and exhaust camshafts, along with four valves per cylinder. The engine employs the same camshaft rotation method: intake camshafts are driven by a timing belt, while exhaust camshafts are gear-driven by the intake camshafts. The valvetrain design of the 2UZ mirrors that of the 1UZ. The intake and exhaust valves are positioned on opposite sides at an angle of 21.55 degrees. The intake valves measure 34.5 mm in diameter, and the exhaust valves are 29.0 mm in diameter, matching the later 1UZ-FE version with VVT-i. The engine features steel solid valve lifters, necessitating periodic valve clearance adjustments.

The initial models of the 2UZ-FE featured a straightforward aluminum intake manifold with an elongated port. This engine incorporated a heat-barrier gasket sandwiched between two metal gaskets, placed between the intake manifold and each cylinder head. Early in its production, the engine was equipped with a standard throttle body, with Toyota's electronically controlled throttle body system (ETCS-i) being introduced in late 2002. Right from its inception, the 2UZ-FE engine utilized sequential multiport fuel injection (SFI). This system employed eight four-hole fuel injectors (one per cylinder), a mass air flow meter, and a pair of air-fuel ratio sensors. The engine also featured Toyota's The Direct Ignition System (DIS) features individual ignition coils for each of the eight cylinders and iridium spark plugs. It also includes two knock sensors and Electronic Spark Advance technology, which regulate and fine-tune the ignition timing to prevent engine knock.

Engine Specifications:

- Manufacturer: Toyota Motor Manufacturing Alabama

- Production Years: 1998-2011

- Cylinder Block Material: Cast Iron

- Cylinder Head Material: Aluminum

- Fuel Type: Gasoline

- Fuel System: Fuel Injection

- Configuration: V

- Number of Cylinders: 8

- Valves per Cylinder: 4

- Valvetrain Layout: DOHC

- Bore: 94.0 mm (3.7 in)

- Stroke: 84.0 mm (3.3 in)

- Displacement: 4,663 cc (284.6 cu in)

- Engine Type: Four-stroke, Naturally Aspirated

- Compression Ratio: 9.6:1, 10.0:1 for VVT-i versions

- Power Output:

- 230-232 hp (170-173 kW) at 4,800 rpm for non-VVT-i, JDM engines

- 271-282 hp (202-210 kW) at 4,800 rpm for VVT-i versions

- Torque:

- 300-311 lb-ft (410-422 Nm) at 3,600 rpm for non-VVT-i

- 315-325 lb-ft (427-440 Nm) at 3,400 rpm for VVT-i versions

- Engine Weight: 562 lbs (255.5 kg)

- Firing Order: 1-8-4-3-6-5-7-2

- Engine Oil Weight: 5W-30

- Engine Oil Capacity: 6.4 liters (including 0.4 liters for the oil filter)

- Oil Change Interval: 7,500 miles (12,000 km) or every 6 months

- Applications: Toyota Tundra, Toyota Sequoia, Toyota Land Cruiser, Toyota 4Runner, Lexus LX 470, Lexus GX 470