The Toyota 1WZ is a 2,184 cc, inline‑four turbo‑diesel engine produced between 1999 and 2005. It features a cast iron block and head, with a single overhead camshaft (SOHC) and 8 valves, prioritizing rugged durability for commercial and off-road use. Output is rated at 75 kW (102 PS) and 240 Nm of torque, designed for reliable, low-maintenance performance under load.
Fitted primarily to the Dyna (U300) and Toyoace light-duty trucks, the 1WZ was engineered for Japanese domestic market (JDM) commercial applications requiring robust, economical power. Emissions compliance for its era was managed through indirect injection and a simple wastegate turbocharger, meeting Japanese Heisei 11 standards without complex after-treatment.
One documented service consideration is potential wear of the mechanical fuel injection pump, particularly in high-mileage examples, which can lead to rough running or smoke. This characteristic, noted in Toyota Technical Service Bulletin TSB-01-09, is common to many mechanical diesel engines and requires periodic calibration for optimal operation.
Production years 1999–2005 meet Japanese Heisei 11 emissions standards (Japan Ministry of Transport Type Approval).
The Toyota 1WZ is a 2,184 cc inline‑four turbo‑diesel engineered for light commercial vehicles (1999-2005). It combines a robust cast iron construction with a simple SOHC valvetrain to deliver dependable torque and exceptional longevity. Designed to meet contemporary Japanese emissions standards, it emphasizes serviceability and cost-effective operation for high-mileage use.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,184 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, SOHC, 8‑valve | |
| Aspiration | Turbocharged (wastegate) | |
| Bore × stroke | 86.0 mm × 94.0 mm | |
| Power output | 75 kW (102 PS) | |
| Torque | 240 Nm @ 2,000 rpm | |
| Fuel system | Indirect injection (mechanical rotary pump) | |
| Emissions standard | Japanese Heisei 11 | |
| Compression ratio | 21.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single wastegate turbo | |
| Timing system | Gear-driven | |
| Oil type | SAE 15W-40 (Mineral) | |
| Dry weight | 270 kg |
The gear-driven timing system offers exceptional durability and eliminates chain/belt maintenance. The high compression ratio and indirect injection demand strict adherence to oil change intervals (every 10,000 km) and the use of high-quality diesel to prevent injector wear. The mechanical injection pump requires periodic calibration checks; neglect can lead to poor running or excessive smoke. Valve clearances require manual adjustment every 40,000 km.
Oil Specs: Requires SAE 15W-40 mineral oil specification (Toyota Workshop Manual RM305E). API CD or higher is suitable for commercial use.
Emissions: Certified under Japanese Heisei 11 standards for all production years (Japan Ministry of Transport).
Power Ratings: Measured under JIS D 1001 standards. Output is consistent across all applications (Toyota Group PT-2002).
Toyota Workshop Manual (RM305E)
Toyota Electronic Parts Catalogue (EPC)
Toyota Technical Service Bulletin (TSB-01-09)
Japan Ministry of Land, Infrastructure, Transport and Tourism (MLIT) Type Approval Database
The Toyota 1WZ was used primarily in Toyota's U300 platform for light commercial vehicles with longitudinal mounting. This engine received minor running changes during its production, including updates to the injection pump calibration, creating potential parts variations. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the flat pad at the front of the engine block, just below the cylinder head on the exhaust manifold side (Toyota Workshop Manual RM305E). The 1WZ is distinguished from the larger 15B-FTE by its 2.2L displacement and from the 1KD-FTV by its mechanical (non-common-rail) injection system. Critical differentiation: The 1WZ uses a mechanical rotary injection pump (Denso) on the side of the engine. Service parts like injector nozzles or pump calibration shims may have variations between early and late production; always verify part numbers using the EPC.
The 1WZ's primary reliability consideration is mechanical fuel injection pump wear, with elevated incidence in high-mileage or poorly maintained examples. Toyota service data indicates this was a common service item, while owner reports frequently cite glow plug and turbocharger issues. Infrequent oil changes can lead to bore wear, making preventative maintenance critical.
Analysis derived from Toyota technical bulletins (1999-2005) and owner workshop manual data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about TOYOTA 1WZ.
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