Nissan

31020-X426A Nissan Sentra JF015E Transmission

OE NO.: 31020-X426A 31020-X427E
Model Number: JF015E
Transmission Speeds: CVT
Gearbox Type: CVT
Product description: Application: Nissan Compact & Subcompact Vehicles: Sentra / Sylphy: 1.6L, 1.8L (2012 - 2019) Versa / Versa Note: 1.6L (2012 - 2019) Juke: 1.6L (2011 - 2017) Tiida / Latio: 1.5L, 1.6L (201
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Model Number	JF015E
MOQ	1 Pcs
Condition	Remanufactured
Warranty	6 Months

The Continuously Variable Transmission (CVT) assembly with reference numbers 31020-X426A and 31020-X427E is designed for the Jatco JF015E (Nissan code RE0F11A). This compact, next-generation CVT features an innovative auxiliary gearbox (sub-planetary gear) and a two-stage pulley system, significantly reducing internal friction and size while providing a wider gear ratio spread for small-displacement engines in the Nissan Sentra, Juke, Versa, Suzuki Swift, and Mitsubishi Mirage.

Quick Specifications:

Part Numbers: 31020-X426A / 31020-X427E (Nissan OEM format)
Transmission Model: Jatco JF015E / Nissan RE0F11A
Type: Continuously Variable Transmission (CVT) with Auxiliary Gearbox
Configuration: Front-Wheel Drive (FWD)
Max Input Torque: ~150-180 Nm (Optimized for 1.0L - 1.8L engines)
Fluid Type: Nissan NS-3 CVT Fluid
Fluid Capacity: ~6.0 - 7.0 Liters (dry fill)

Applications:

Nissan Sentra / Sylphy (B17, 2012-2019, 1.6L/1.8L variants)
Nissan Juke (F15, 2010-2019, 1.6L naturally aspirated variants)
Nissan Versa / Note (N17 / E12, 2012-present, 1.6L variants)
Nissan Micra / March (K13, select 1.2L/1.5L markets)
Suzuki Swift / Baleno (Select global markets using Nissan-sourced CVT)
Mitsubishi Mirage / Attrage (Select CVT-equipped 1.2L variants)
Chevrolet Spin (Select South American markets)

Complete Assembly Includes:

✅ Compact transmission case with integrated sub-planetary gearset
✅ High-tensile steel push-belt and reduced-diameter primary/secondary pulleys
✅ Torque converter with early-engagement lock-up clutch
✅ Valve body with high-response solenoids and step motors
✅ Integrated Transmission Control Module (TCM) or external connector
✅ High-capacity oil pump, speed sensors, and differential assembly
✅ Sealing gaskets and O-rings

Key Features:

✅ Auxiliary Gearbox Design: Uses a sub-planetary gear to switch between low and high ranges, allowing for much smaller pulleys and a wider overall gear ratio spread (7.3:1).
✅ Reduced Internal Friction: Friction is reduced by up to 40% compared to the previous JF011E, significantly boosting fuel economy for compact cars.
✅ Compact & Lightweight: The two-stage design reduces the overall physical size and weight of the transmission, freeing up cabin space and reducing vehicle weight.
✅ Seamless Acceleration: Provides smooth, stepless power delivery while minimizing the traditional "CVT drone" through early lock-up clutch engagement.

Technical Notes:

Critical Installation Requirements:

Fluid Specification: Must use Nissan NS-3 CVT fluid exclusively. Using older NS-2 fluid or standard ATF will cause immediate belt slippage, overheating, and catastrophic failure due to incorrect friction modifiers and viscosity.
Level Check Procedure: The fluid level must be checked via the overflow plug at a strict temperature range (typically 40°C for the initial check, then 50°C–70°C for the final check) with the engine running and the fluid circulated through all modes.
TCM Calibration: After installation, a "TCM Memory Reset," "Idle Air Volume Learning," and "CVT Calibration" must be performed using a Nissan Consult-III or equivalent professional diagnostic scanner.
Cooler Flushing: The transmission cooler and lines must be flushed or replaced. Metallic debris from a failed CVT will clog the new valve body and destroy the pulleys immediately.

Common Issues & Maintenance:

Step Motor / Solenoid Wear: The JF015E relies heavily on step motors to control pulley ratios. Wear or debris can cause the transmission to get stuck in a single ratio (limp mode). Regular fluid changes are the best prevention.
Bearing Noise: Whining or humming noises often indicate wear on the input shaft or differential bearings, a known wear item in high-mileage JF015E units.
Overheating: Compact CVTs can run hot in stop-and-go traffic. Ensure the cooling system is efficient and avoid heavy towing.
Fluid Service Intervals: Strict adherence to NS-3 fluid change intervals (every 40,000–60,000 km) is absolutely critical for the longevity of the push-belt and pulley surfaces.