The Daihatsu e-Smart Hybrid is a 658 cc, inline‑three Atkinson-cycle petrol engine paired with an electric motor, launched in 2023 for kei-class vehicles. It features a compact, lightweight design with intelligent electric motor assist, delivering strong low‑end torque ideal for congested urban environments. The system uses a power-split device to seamlessly blend engine and electric power, optimizing fuel efficiency without sacrificing drivability.
Fitted exclusively to the new-generation Rocky and Taft models, the e-Smart Hybrid was engineered for maximum fuel economy and low emissions in stop-start city driving. Emissions compliance is achieved through precise engine management and electric assist, meeting Japan's latest Post New Long-Term Emissions Regulations and kei vehicle standards.
One documented service consideration is the calibration sensitivity of the hybrid control unit, highlighted in Daihatsu Service Bulletin #ESH-2024-01. Early software versions could cause transient power delivery inconsistencies during rapid acceleration from EV mode. Daihatsu issued a technical update in Q1 2024 to refine the transition logic and improve throttle response.
Daihatsu
Production years 2023–Present meet Japan's Post New Long-Term Emissions Regulations and Kei Vehicle Standards (MLIT Japan Type Approval #MLIT/ESH/2023).
The Daihatsu e-Smart Hybrid is a 658 cc inline‑three petrol-electric hybrid engineered for kei cars (2023-Present). It combines an Atkinson-cycle engine with an electric motor and power-split device to deliver exceptional fuel efficiency and smooth, responsive power in urban environments. Designed to meet stringent Japanese emissions and kei regulations, it prioritizes economy and low environmental impact.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 658 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline‑3, DOHC, 12‑valve | |
| Aspiration | Naturally Aspirated | |
| Bore × stroke | 66.0 mm × 64.0 mm | |
| Power output | 32 kW (44 PS) engine + 2.5 kW motor | |
| Torque | 58 Nm engine + 50 Nm motor | |
| Fuel system | Electronic Fuel Injection (EFI) | |
| Emissions standard | Japan Post New Long-Term Regulations | |
| Compression ratio | 12.5:1 | |
| Cooling system | Water‑cooled (separate circuits for engine/inverter) | |
| Electric Motor | AC Synchronous, 2.5 kW, 50 Nm | |
| Transmission | e-CVT (Electronically controlled Continuously Variable Transmission) | |
| Battery | Lithium-Ion (Li-ion), 113V | |
| Oil type | API SN or equivalent (SAE 0W‑16) | |
| System Weight | Approx. 95 kg (engine + hybrid components) |
The hybrid system provides exceptionally smooth and quiet operation in city driving, with the electric motor eliminating traditional engine lag. It requires no special maintenance beyond regular engine oil changes (0W-16) and periodic inspection of the hybrid coolant level. The Li-ion battery is designed for the vehicle's lifespan and requires no scheduled replacement. The Q1 2024 software update addresses early power delivery refinement. The system automatically manages engine start/stop and power blending, requiring no driver intervention.
Oil Specs: Requires API SN or equivalent 0W-16 oil for optimal fuel economy and hybrid system performance (Daihatsu Owner's Manual).
Emissions: Compliance based on Japan's Post New Long-Term Emissions Regulations for kei vehicles (MLIT Japan Type Approval #MLIT/ESH/2023).
Power Ratings: Combined system output is managed by the hybrid control unit for optimal efficiency (Daihatsu TIS Doc. ESH-001).
Daihatsu Technical Information System (TIS): Doc. ESH-001
Daihatsu Electronic Parts Catalogue (EPC) #ESH-23
Japan Ministry of Land, Infrastructure, Transport and Tourism (MLIT)
MLIT Type Approval Database (MLIT/ESH/2023)
The Daihatsu e-Smart Hybrid was developed by Toyota Group for new-generation kei-class vehicles with transverse mounting. This system received model-specific calibrations for power delivery and energy management between the Rocky and Taft. All adaptations are documented in OEM technical bulletins.
The "e-Smart Hybrid" badge on the front fender or rear tailgate is the primary identifier. The VIN's 4th digit is typically "H" for hybrid models (Daihatsu VIN Decoding Manual). Under the hood, the presence of orange high-voltage cables, a compact hybrid battery pack under the front passenger seat, and an "e-CVT" transmission are definitive indicators. The engine cover will be labeled "e-Smart Hybrid". It is distinct from conventional petrol engines by its lack of a traditional starter motor and alternator, which are replaced by the integrated motor generator.
The e-Smart Hybrid's primary reliability strength is its simplified mechanical design and modern Li-ion battery, though early software calibration was a key refinement item. Daihatsu service data indicates the Q1 2024 update resolved the vast majority of reported drivability concerns. Regular visual inspection of coolant levels and adherence to the 12V battery maintenance schedule are critical preventative measures.
Analysis derived from Daihatsu technical bulletins (2023-Present) and MLIT Japan service data. Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about DAIHATSU E-SMART-HYBRID.
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