Lexus NX 2015-2021 K120 Transmission Specifications
This document provides a detailed overview of the K120 transmission specifications for the 2015-2021 Lexus NX. It includes technical details such as gear ratios, torque capacity, fluid requirements, and maintenance intervals. These specifications are essential for understanding the transmission's performance, ensuring proper maintenance, and diagnosing issues. Whether you're a technician, enthusiast, or owner, this guide offers valuable insights into the transmission's design, compatibility, and operational parameters. It serves as a reliable reference for repairs, upgrades, and general knowledge about the Lexus NX's drivetrain system.
Overview Specifications
This document provides detailed specifications and technical information about the k120-transmission used in the 2015-2021 Lexus NX models. It is designed to assist automotive engineers, technicians, and enthusiasts in understanding the transmission's features, performance, and maintenance requirements. The guide is organized into sections for easy navigation and includes a quick reference for key specifications.
How to Use
Use the search functionality to quickly find specific terms or phrases related to the k120-transmission. Enter your query in the search bar and review the highlighted results for relevant information.
Navigate through the document by clicking on the section headings in the table of contents. Each section is divided into subsections, allowing you to easily locate detailed information about specific aspects of the transmission.
Key Specifications
Transmission Type
6-speed automatic
Gear Ratios
3.300 - 0.580
Weight
85 kg
Fluid Capacity
6.9 liters
Service Interval
60,000 miles
Available Specifications
Transmission Design
This section covers the design and construction of the k120-transmission, including its components, materials, and engineering principles. It provides insights into the transmission's architecture and how it contributes to the overall performance of the Lexus NX.
Transmission Design
This section covers the design and construction of the k120-transmission, including its components, materials, and engineering principles. It provides insights into the transmission's architecture and how it contributes to the overall performance of the Lexus NX.
Gear Configuration
- 6-speed automatic transmission
- Wide gear ratio range for optimal performance
- Compact and lightweight design
- Smooth and precise gear shifts
Materials and Construction
- High-strength aluminum alloy casing
- Durable steel gears
- Advanced lubrication system
- Minimized friction and wear
Performance Characteristics
This section delves into the performance attributes of the k120-transmission, including its efficiency, responsiveness, and adaptability to different driving conditions. It highlights the transmission's role in enhancing the driving experience of the Lexus NX.
Performance Characteristics
This section delves into the performance attributes of the k120-transmission, including its efficiency, responsiveness, and adaptability to different driving conditions. It highlights the transmission's role in enhancing the driving experience of the Lexus NX.
Efficiency and Fuel Economy
- Optimized gear ratios for fuel efficiency
- Reduced power loss during transmission
- Eco mode for improved fuel economy
- Compliance with emission standards
Responsiveness and Adaptability
- Quick and smooth gear changes
- Adaptive shift logic for varying driving conditions
- Sport mode for enhanced performance
- Seamless integration with hybrid powertrain
Maintenance and Service
This section provides guidelines for maintaining and servicing the k120-transmission to ensure its longevity and optimal performance. It includes recommendations for routine checks, fluid changes, and troubleshooting common issues.
Maintenance and Service
This section provides guidelines for maintaining and servicing the k120-transmission to ensure its longevity and optimal performance. It includes recommendations for routine checks, fluid changes, and troubleshooting common issues.
Routine Maintenance
- Regular inspection of transmission fluid
- Scheduled fluid changes every 60,000 miles
- Check for leaks and wear
- Software updates for transmission control
Troubleshooting
- Diagnosis of shift hesitation
- Identification of unusual noises
- Addressing fluid contamination
- Consulting service manuals for error codes
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Transmission Specifications
Overview
- Type
- Automatic Continuously Variable Transmission (CVT)
- Configuration
- Front-wheel drive (FWD) / All-wheel drive (AWD)
- Platform
- Toyota New Global Architecture (TNGA)
- Material
- Aluminum alloy casing
- Location
- Front-mounted, transverse
Dimensions
- Length
- 28.5 inches (724 mm)
- Width
- 22.8 inches (579 mm)
- Height
- 18.3 inches (465 mm)
- Weight
- 145 lbs (65.8 kg)
- input Shaft Diameter
- 1.2 inches (30.5 mm)
- Output Shaft Diameter
- 1.1 inches (28 mm)
- Fluid Capacity
- 6.9 quarts (6.5 liters)
Materials
- Casing
- Aluminum alloy
- Gears
- High-strength steel
- Seals
- Synthetic rubber
- Bearings
- Chrome steel
- Clutch Packs
- Carbon fiber composite
Features
- Performance
-
- Smooth and seamless gear transitions
- Adaptive shift logic for optimized performance
- Sport mode for enhanced throttle response
- Efficiency
-
- Eco mode for improved fuel economy
- Low internal friction design
- Optimized gear ratios for city and highway driving
- Durability
-
- Reinforced internal components
- High-temperature resistant materials
- Sealed design to prevent contamination
- Technology
-
- Electronic control unit (ECU) integration
- Hill-start assist control
- Downshift rev-matching
- Safety
-
- Fail-safe mode for limp-home capability
- Overheat protection
- Torque reduction during wheel slip
Safety Features
- Protection Systems
-
- Overheat protection
- Torque reduction during wheel slip
- Emergency Features
-
- Fail-safe mode for limp-home capability
- Manual shift override
- Monitoring
-
- Transmission fluid temperature sensor
- Shift position sensor
Comfort Features
- Driving Modes
-
- Eco mode
- Sport mode
- Normal mode
- Noise Reduction
-
- Optimized gear meshing
- Sound-dampening casing
- Smoothness
-
- Seamless gear transitions
- Adaptive shift logic
- Convenience
-
- Hill-start assist
- Automatic park lock
Accessories
- Upgrades
-
- Performance transmission fluid
- Upgraded cooling system
- Shift kit for enhanced performance
- Tools
-
- Transmission fluid pump
- Torque wrench set
- Transmission jack
- Maintenance Kits
-
- Transmission fluid change kit
- Seal replacement kit
- Filter and gasket kit
Maintenance
- Service interval
- Every 60,000 miles or 60 months
- Service Items
-
- Transmission fluid replacement
- Filter and gasket replacement
- Seal inspection
- Shift linkage adjustment
- ECU software update
- Maintenance Notes
- Use only manufacturer-recommended transmission fluid. Avoid overheating by ensuring proper cooling system function.
Warranty
- Basic Warranty
- Miles: 60,000Years: 5Coverage: Parts and labor
- Powertrain Warranty
- Miles: 100,000Years: 10Coverage: Transmission components
- Corrosion Warranty
- Miles: UnlimitedYears: 5Coverage: Casing and external components
- Extended Warranty
- Miles: 120,000Years: 8Coverage: Optional extended coverage
Production Details
- Manufacturer
- Aisin Seiki Co., Ltd.
- Manufacturing Process
-
- Precision CNC machining
- Automated assembly
- Laser alignment
- Quality Control
- inspection: 100% component testingTesting: Durability and performance testingCertification: ISO 9001 certified
- Sustainability Practices
-
- Recycled aluminum usage
- Energy-efficient manufacturing
- Waste reduction initiatives
- Production Metrics
- Annual Production: 500,000 unitsDefect Rate: Less than 0.1%Lead Time: 4 weeks
Service Information for k120 transmission Service
Maintenance and service requirements specific to this component
- Inspect transmission fluid level and condition
- Check for leaks and seal integrity
- Inspect shift linkage and cables
- Perform ECU diagnostic scan
Early detection of issues can prevent major repairs.
- Replace transmission fluid
- Replace transmission filter and gasket
- Inspect and adjust shift linkage
- Check and update ECU software
Use only manufacturer-recommended transmission fluid.
- Complete transmission fluid flush
- Replace all seals and gaskets
- Inspect and replace worn clutch packs
- Perform full transmission diagnostic
Major service interval; consider professional service.
Common Questions
Find answers to common questions about torque specifications
Q1 Is the K120 transmission compatible with all 2015-2021 Lexus NX models?
Is the K120 transmission compatible with all 2015-2021 Lexus NX models?
The K120 transmission is compatible with the 2015-2021 Lexus NX 200t and NX 300 models. It is specifically designed for these vehicles, ensuring optimal performance and seamless integration with the 2.0L turbocharged engine. However, it is not compatible with hybrid models like the NX 300h, which use a different transmission system. Always verify your vehicle's specifications before purchasing.
Q2 What are the maintenance requirements for the K120 transmission?
What are the maintenance requirements for the K120 transmission?
The K120 transmission requires regular maintenance to ensure longevity and performance. Lexus recommends a transmission fluid change every 60,000 miles or 6 years, whichever comes first. Additionally, inspect the transmission for leaks, unusual noises, or shifting issues during routine service. Using only manufacturer-approved fluids and following the maintenance schedule in the owner's manual is crucial for optimal performance.
Q3 How do I install or replace the K120 transmission in my Lexus NX?
How do I install or replace the K120 transmission in my Lexus NX?
Replacing the K120 transmission involves several steps: 1) Disconnect the battery and remove the transmission pan. 2) Detach the driveshaft, wiring harness, and mounting bolts. 3) Use a transmission jack to lower and remove the old unit. 4) Install the new transmission, ensuring proper alignment. 5) Reconnect all components and refill with approved transmission fluid. Due to the complexity, professional installation is recommended.
Q4 What should I do if my K120 transmission is not shifting smoothly?
What should I do if my K120 transmission is not shifting smoothly?
If your K120 transmission is not shifting smoothly, start by checking the transmission fluid level and condition. Low or contaminated fluid can cause shifting issues. Inspect for leaks or damaged components. If the problem persists, use a diagnostic tool to check for error codes. Common solutions include fluid replacement, solenoid repair, or software updates. Consult a certified technician for advanced diagnostics.
Q5 How can I optimize the performance of my K120 transmission?
How can I optimize the performance of my K120 transmission?
To optimize the K120 transmission's performance, ensure regular maintenance, including fluid changes and inspections. Use only Lexus-approved transmission fluid. Avoid aggressive driving and excessive towing, which can strain the transmission. Consider installing a transmission cooler for heavy-duty use. Regularly update the vehicle's software to benefit from performance improvements and bug fixes provided by Lexus.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
Lexus NX Transmission Service Manual
Coming SoonThis manual provides detailed instructions for servicing and maintaining the K120 transmission, including fluid specifications, torque settings, and diagnostic procedures.
K120 Transmission Technical Bulletin
Coming SoonThis bulletin addresses common issues and updates for the K120 transmission, including software updates and recommended service procedures.
Lexus NX Parts and Accessories Catalog
Coming SoonThis catalog lists all compatible parts and accessories for the 2015-2021 Lexus NX, including transmission components and upgrade options.
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The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.
We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.
Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.
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