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Toyota 1nz automatic transmission Engine
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Toyota 1nz automatic transmission Engine

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A “Toyota 1NZ automatic transmission” is a transmission system paired with the Toyota 1NZ engine (a 1.5-liter engine). This is generally a Toyota U transmission, such as the U340E model, which is a 4-speed automatic transaxle used in vehicles like the Toyota Echo, Yaris, and Corolla.
 

Understanding the Parts:
  • Toyota 1NZ: This is the code for a 1.5-liter engine used in many Toyota vehicles. 
  • Automatic Transmission: This is the mechanism that transfers power from the engine to the wheels, automatically changing gears without a manual clutch and gear lever. 
Common Applications:

The Toyota 1NZ engine, when paired with an automatic transmission, is commonly found in: Toyota Echo, Toyota Yaris, Toyota Vios, Scion xA and xB, and Certain models of the Toyota Corolla. 

What it Does:
The transmission system handles the engine’s power and uses different gear ratios to control the vehicle’s speed. In an automatic, it does this without driver intervention, making it a convenient choice for everyday driving.
The 1NZ engine itself is a 1.5L (1497cc) inline 4-cylinder, 16-valve, DOHC engine with VVT-i. While there isn’t a specific “1NZ automatic transmission,” the 1NZ engine is commonly paired with the Toyota U340E/U341E 4-speed automatic transaxle. Key characteristics of this transmission include a 4-speed automatic configuration and specific gear ratios, such as 2.847 (1st), 1.552 (2nd), 1.000 (3rd), 0.700 (4th), 2.343 (Reverse), and 4.237 (Final).
 

Engine Specifications (1NZ-FE)
  • Displacement: 1.5 L (1,497 cc) 
  • Engine Type: Inline 4-cylinder, DOHC, 16-valve 
  • Valvetrain: VVT-i (Variable Valve Timing with intelligence) on the intake camshaft 
  • Block: Aluminum cylinder block 
  • Oil Capacity: Varies, but approximately 4.3 to 4.4 liters for the AT version in some models 
  • Fluid Type: Toyota CVT Fluid TC is used in some CVT applications, while traditional ATs might use Toyota ATF Type T-IV. 

Transmission Specifications (U340E/U341E Transaxle) 

  • Type: 4-speed automatic transaxle
  • Gear Ratios:
    • 1st: 2.847
    • 2nd: 1.552
    • 3rd: 1.000
    • 4th: 0.700
    • Reverse: 2.343
    • Final Drive: 4.237
  • Common Applications: Toyota Echo, Vios, Yaris, and some Corolla models.
Important Considerations
  • Model & Year:

    Transmission specifications can vary significantly depending on the vehicle’s make, model, and year. 

  • CVT vs. Automatic:
    Some 1NZ-FE engines were paired with Continuously Variable Transmissions (CVT), which have different characteristics than the 4-speed automatic (like the U340E/U341E). 

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