30400-52450 Toyota Yaris 1.3L K312 Transmission

Model Number	K312
MOQ	1 Pcs
Condition	Remanufactured
Warranty	12 Months

The Continuously Variable Transmission (CVT) assembly with reference numbers 30400-52450 and 3040052450 is designed for the Toyota Aisin K312 Super CVT-i automatic transaxle. This unit features electronically controlled variable-diameter pulleys and a lock-up torque converter, delivering smooth stepless shifting and superior urban fuel efficiency for Toyota Yaris, Vios, and related compact platforms.

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Quick Specifications:
• Part Numbers: 30400-52450 / 3040052450
• Transmission Model: K312 (Super CVT-i Automatic)
• Configuration: Transverse Front-Wheel Drive (FWD)
• Engine Compatibility: 1.3L 6NR-FE / 1.5L 7NR-FE Dual VVT-i L4
• Fluid Type: Genuine Toyota CVT Fluid FE (Low Viscosity)

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Applications:
• Toyota Yaris (2016-2022, 1.3L 6NR-FE & 1.5L 7NR-FE variants)
• Toyota Vios (2016-2022, 1.3L 6NR-FE & 1.5L 7NR-FE variants)
• Toyota Yaris Ativ (NSP150 / NSP151, 1.3L & 1.5L variants)

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Complete Assembly Includes:
✅ Transmission case with primary and secondary Super CVT-i pulleys
✅ High-strength steel push-belt
✅ Torque converter with lock-up clutch
✅ Valve body with linear pressure control solenoids
✅ Oil pump, internal filter, and speed sensors
✅ Sealing gaskets and O-rings

Note: Mounts, shift cables, external cooler lines, and wiring adapters may need to be transferred or purchased separately.

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Key Features:
✅ Super CVT-i stepless ratio architecture for smooth city acceleration and fuel economy
✅ Early lock-up torque converter minimizes slippage and mechanical loss
✅ Intelligent shift control prevents engine droning under brisk acceleration
✅ Compatible with low-viscosity Toyota CVT Fluid FE for reduced parasitic drag
✅ Compact lightweight design tailored for subcompact passenger vehicles

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Technical Notes:

Installation Criticals:
• Fluid Fill: Must follow Toyota's specific overflow tube temperature check procedure (35°C - 45°C) using a scan tool. Over/under-filling causes belt slippage or failure.
• TCM Programming: CVT oil pressure calibration, deceleration sensor zero-point calibration, and memory reset are required after installation using Toyota Techstream (GTS).
• Torque Converter: Ensure full seating ("three clicks") into the oil pump before mating to the engine to prevent pump damage.
• Cooler Flushing: Flush the transmission fluid warmer/cooler and lines thoroughly to remove debris from the old unit.

Maintenance Tips:
• Use only genuine Toyota CVT Fluid FE (do not use standard ATF).
• Perform ECU/TCM adaptation reset via OBD2 scanner after installation.
• Monitor transmission temperature and inspect for leaks after the initial test drive.