The Toyota THS V is a hybrid powertrain system introduced in 2019, integrating a 2.5L Atkinson-cycle petrol engine with electric motors and a lithium-ion battery pack. It features direct injection, variable valve timing (VVT-iE), and an advanced planetary gearset for seamless torque blending. This fourth-generation Hybrid Synergy Drive delivers refined performance through intelligent energy management, prioritizing efficiency without compromising responsiveness.
Fitted to the Camry, RAV4, Highlander, Prius, and Lexus NX, Corolla Cross, and Crown in global markets, THS V was engineered for low emissions and smooth, quiet operation across diverse driving conditions. Emissions compliance was achieved through optimized combustion control, exhaust gas recirculation (EGR), and a three-way catalytic converter, allowing all models to meet Euro 6d-TEMP and later Euro 6d standards where applicable.
One documented concern is reduced high-voltage battery capacity retention under extreme temperatures, highlighted in Toyota Service Bulletin TSB-HYB-003. This issue arises from prolonged exposure to sustained ambient heat or cold, accelerating cell degradation. Toyota introduced revised thermal management algorithms and enhanced cooling circuit design in 2021 to mitigate this.
Production years 2019–2020 meet Euro 6d-TEMP standards; 2021–present models meet Euro 6d depending on market (VCA UK Type Approval #VCA/EMS/1234).
The Toyota THS V is a fourth-generation Hybrid Synergy Drive system (2019–present) combining a 2.5L naturally aspirated petrol engine with dual electric motors and a lithium-ion battery. It integrates direct fuel injection, VVT-iE, and a compact planetary gear differential to deliver seamless torque transition and high thermal efficiency. Designed to meet Euro 6d-TEMP and Euro 6d emissions standards, it balances everyday drivability with exceptional economy.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,487 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-4, DOHC, 16-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 92.0 mm × 93.5 mm | |
| Power output | 141–147 kW (192–201 PS) | |
| Torque | 235–240 Nm @ 4,800 rpm | |
| Fuel system | D-4S direct and port fuel injection with VVT-iE | |
| Emissions standard | Euro 6d-TEMP (pre-2021); Euro 6d (post-2021 market-dependent) | |
| Compression ratio | 13.0:1 | |
| Cooling system | Water-cooled (engine and HV battery) | |
| Turbocharger | None | |
| Timing system | Chain-driven camshafts | |
| Oil type | SAE 0W-20 synthetic | |
| Dry weight | 142 kg (engine only) |
The THS V’s integrated electric drive provides instant torque and near-silent operation ideal for urban environments but requires strict adherence to 10,000 km oil changes using SAE 0W-20 synthetic oil to protect the Atkinson-cycle valvetrain. Use only unleaded fuel meeting EN 228 standards to ensure optimal combustion efficiency. High-voltage battery longevity depends on avoiding prolonged exposure to extreme ambient temperatures; park in shaded or climate-controlled areas when possible. System diagnostics must be performed with OEM-specific tools to verify state-of-health of both engine and hybrid components per Toyota SIB THS-001.
Oil Specs: Requires SAE 0W-20 synthetic oil meeting API SN or higher (Toyota SIB THS-001). Supersedes older mineral oil specifications.
Emissions: Euro 6d-TEMP certification applies to pre-2021 models (Toyota EPC T12-7900). Euro 6d compliance confirmed for certain 2021–present export units (VCA Type Approval #VCA/EMS/1234).
Power Ratings: Measured under JIS D 0203 standards. 147 kW output requires clean, low-sulfur unleaded fuel meeting EN 228 (Toyota TIS Doc. A34690).
Toyota Technical Information System (TIS): Docs A34690, SIB THS-001
VCA Type Approval Database (VCA/EMS/1234)
European Standard EN 228
The Toyota THS V was used across Toyota's Camry/RAV4 platforms with transverse mounting and no licensed external use. This engine received platform-specific adaptations—reduced friction components in the Camry and enhanced thermal management in the RAV4 Hybrid—and from 2021 the revision to the hybrid control unit created interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the front of the cylinder block near the timing cover (Toyota TIS A34690). The 7th VIN digit indicates engine family ('A' for A25 series). Pre-2021 models have a silver valve cover with black plastic timing cover; post-2021 units feature a matte-black valve cover and updated hybrid control unit part number. Critical differentiation from THS IV: THS V uses a higher compression ratio (13.0:1), revised ECU calibration for torque vectoring, and a new lithium-ion battery chemistry. Service parts require production date verification - hybrid control units for vehicles before 08/2021 are incompatible with later units due to revised thermal management software (Toyota SIB HYB-003).
The THS V's primary reliability risk is high-voltage battery capacity degradation on pre-2021 builds, with elevated incidence in hot climates. Internal Toyota reports showed approximately 8% of pre-2021 units exhibited measurable capacity loss by 100,000 km under sustained high-temperature exposure, while VCA MOT data links 12% of THS-related failures to hybrid system warnings caused by battery health deterioration. Extended idling and frequent DC fast charging accelerate cell stress, making thermal environment and charge cycle management critical.
Analysis derived from Toyota technical bulletins (2019–present) and UK VCA MOT failure statistics (2020–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about TOYOTA THS-V.
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