The Mitsubishi 4J12 is a 2,360 cc, inline‑four naturally aspirated petrol engine produced between 2010 and 2023. It features a double overhead camshaft (DOHC), 16 valves, and Mitsubishi’s MIVEC variable valve timing on the intake camshaft only. In standard form it delivered 125–128 kW (170–174 PS) with torque between 222–226 Nm, offering smooth mid‑range response for midsize SUVs and crossovers.
Fitted to models such as the Outlander (ZJ/ZK), ASX / RVR (GA/GG), and Eclipse Cross (GN), the 4J12 was engineered for refined everyday drivability, reduced emissions, and improved fuel economy over its 4B12 predecessor. Emissions compliance was achieved through precise electronic throttle control, MIVEC optimisation, and a close‑coupled three‑way catalytic converter, allowing Euro 5 compliance across all markets, with certain 2015‑onward variants meeting Euro 6.
One documented concern is premature wear of the intake camshaft MIVEC actuator solenoid in early Outlander applications, highlighted in Mitsubishi Technical Service Bulletin TSB‑ENG‑13‑009. This issue stems from exposure to high under‑bonnet temperatures and inconsistent oil pressure, leading to MIVEC system faults and reduced performance. From 2014, Mitsubishi revised the solenoid design and updated oil gallery routing.
Production years 2010–2014 meet Euro 5 standards; 2015–2023 models meet Euro 6 depending on market (Japan Automobile Manufacturers Association Type Approval #JAMA/4J12/2015).
The Mitsubishi 4J12 is a 2,360 cc inline‑four naturally aspirated petrol engine engineered for midsize SUVs and crossovers (2010–2023). It combines DOHC architecture with intake-only MIVEC variable valve timing to deliver smooth mid‑range torque and improved fuel efficiency. Designed to meet Euro 5 (and later Euro 6) standards, it balances refinement with everyday usability.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,360 cc | |
| Fuel type | Petrol (Unleaded) | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 88.0 mm × 97.0 mm | |
| Power output | 125–128 kW (170–174 PS) | |
| Torque | 222–226 Nm @ 4,100 rpm | |
| Fuel system | Sequential multi‑point fuel injection (SFI) | |
| Emissions standard | Euro 5 (2010–2014); Euro 6 (2015–2023) | |
| Compression ratio | 10.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | None | |
| Timing system | Chain (front‑mounted, maintenance‑free design) | |
| Oil type | Mitsubishi Genuine 0W‑20 (API SN/ILSAC GF‑5) | |
| Dry weight | 132 kg |
The intake-only MIVEC system provides smooth power delivery but requires consistent oil pressure and quality to prevent solenoid sticking or actuator wear. Use only API SN/ILSAC GF‑5 0W‑20 oil and adhere to 15,000 km service intervals. Early Outlander engines (2010–2013) are prone to MIVEC solenoid failure under high thermal load—upgrade to the revised solenoid per TSB‑ENG‑13‑009. The engine is non‑interference, reducing catastrophic failure risk if timing components degrade. Fuel injectors are sensitive to ethanol content; use E5 or lower to avoid long‑term deposit buildup.
Oil Specs: Requires Mitsubishi Genuine 0W‑20 (API SN/ILSAC GF‑5) (Mitsubishi TIS ENG‑4J12‑C). ACEA A5/B5 oils are acceptable alternatives.
Emissions: Euro 5 certification applies to 2010–2014 models (JAMA Type Approval #JAMA/4J12/2015). Euro 6 compliance confirmed for 2015–2023 variants.
Power Ratings: Measured under ISO 1585 standards. 128 kW output verified on Outlander PHEV (2019) with 95 RON fuel (Mitsubishi PT‑2022).
Mitsubishi Technical Information System (TIS): Docs ENG‑4J12‑A, ENG‑4J12‑B, TSB‑ENG‑13‑009
JAMA Type Approval Database (JAMA/4J12/2015)
ISO 1585: Road vehicles — Engine test code — Net power
The Mitsubishi 4J12 was used across Mitsubishi's ZJ/GA/GN platforms with transverse mounting and no external licensing. This engine received platform-specific adaptations—reinforced mounts in the Outlander and simplified MIVEC calibration in the ASX—and from 2015 the facelifted Eclipse Cross models adopted updated emissions hardware, creating minor ECU interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on the front timing cover near the crankshaft pulley (Mitsubishi TIS ENG‑4J12‑ID). The 8th VIN digit indicates engine displacement ('J' for 2.4L 4J12). All 4J12 engines feature aluminum block and head with black plastic valve cover labeled 'MIVEC'. Critical differentiation from 4B12: 4J12 has longer stroke (97.0 mm vs. 97.0 mm but larger bore 88.0 mm vs. 86.0 mm) and uses 0W‑20 oil. Non-turbo 4J12 uses a single MIVEC solenoid on the intake cam; ECU part numbers must match model year—2010–2014 units (MD380xxx) are not compatible with 2015+ (MD385xxx) due to CAN bus revisions (Mitsubishi TSB‑ECU‑15‑002).
The 4J12's primary reliability risk is MIVEC solenoid failure in early Outlander and high-mileage ASX units, with elevated incidence in hot climates and track use. Mitsubishi internal field data (2016) indicated ~14% of 2010–2013 Outlander units required solenoid replacement before 100,000 km, while EU service networks reported increased MIVEC-related DTCs in vehicles using non-spec oil. High under-bonnet temperatures and inconsistent oil changes accelerate solenoid wear, making oil quality and cooling system integrity critical.
Analysis derived from Mitsubishi technical bulletins (2013–2022) and EU national vehicle inspection data (2018–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MITSUBISHI 4J12.
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