The Mitsubishi 9HD is a 2,268 cc, inline‑four turbo‑diesel engine produced between 2019 and 2023. It features an aluminum block with cast‑iron liners, DOHC 16‑valve architecture, and a variable geometry turbocharger (VGT). In standard form it delivered 135 kW (184 PS) and 400 Nm of torque, with strong low‑end response and refined operation suited for mid-size SUVs.
Fitted exclusively to the Pajero Sport (KH4#) and Triton/L200 (KJ#) in select global markets, the 9HD was engineered for enhanced emissions compliance and durability in rugged conditions. Emissions compliance was achieved through high-pressure common‑rail injection, cooled exhaust gas recirculation (EGR), and a diesel particulate filter (DPF), meeting Euro 6d TEMP standards across certified regions.
One documented concern is premature diesel oxidation catalyst (DOC) degradation under frequent short‑trip driving, highlighted in Mitsubishi Technical Service Bulletin TSB-ENG-20-003. This issue was linked to insufficient exhaust temperature for catalyst light-off and exacerbated by urban driving cycles. From 2021 onward, Mitsubishi introduced revised ECU calibration to improve thermal management during cold starts.
Production years 2019–2023 meet Euro 6d TEMP standards in EU-certified markets (VCA UK Type Approval #VCA/EMS/3489).
The Mitsubishi 9HD is a 2,268 cc inline‑four turbo‑diesel engineered for mid-size SUVs and pickups (2019–2023). It combines DOHC 16-valve architecture with high-pressure common-rail injection and a variable geometry turbocharger to deliver responsive torque and smooth operation. Designed to meet Euro 6d TEMP emissions standards, it integrates advanced after-treatment systems for urban and highway compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,268 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged | |
| Bore × stroke | 86.0 mm × 97.4 mm | |
| Power output | 135 kW (184 PS) @ 3,500 rpm | |
| Torque | 400 Nm @ 1,500–2,500 rpm | |
| Fuel system | Denso common‑rail (up to 2,000 bar) | |
| Emissions standard | Euro 6d TEMP | |
| Compression ratio | 15.5:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Variable geometry turbo (VGT, Mitsubishi TD04-based) | |
| Timing system | Chain (maintenance‑free design) | |
| Oil type | API CK-4, ACEA C6, SAE 0W‑30 | |
| Dry weight | 162 kg |
The DOHC VGT design provides strong low-RPM torque ideal for off-road and towing but requires strict adherence to 15,000 km oil change intervals using ACEA C6 0W‑30 oil to protect the chain-driven valvetrain and turbo bearings. The Euro 6d TEMP after-treatment system (DOC, DPF, SCR) demands occasional sustained highway driving (≥60 km/h for 20+ minutes) to enable passive regeneration and catalyst light-off. Frequent short trips without thermal cycling lead to DOC inefficiency and DPF saturation. Post-2021 ECUs feature improved cold-start thermal management per TSB-ENG-20-003. Fuel must meet EN 590 ultra-low-sulfur diesel (ULSD) standards to prevent injector and after-treatment damage.
Oil Specs: Requires ACEA C6 (0W‑30) specification (Mitsubishi Owner’s Manual 2019). API CK-4 also acceptable.
Emissions: Euro 6d TEMP certification applies to all 2019–2023 models in EU markets (VCA Type Approval #VCA/EMS/3489).
Power Ratings: Measured under ISO 1585 standards. Output consistent across global variants (Mitsubishi TIS Doc. ENG‑9HD‑A).
Mitsubishi Technical Information System (TIS): Docs ENG‑9HD‑A, ENG‑9HD‑B, TSB-ENG-20-003
VCA Type Approval Database (VCA/EMS/3489)
ISO 1585: Road vehicles — Engine test code
The Mitsubishi 9HD was used across Mitsubishi's KH/KJ-series utility platforms with longitudinal mounting and no external licensing. This engine received platform-specific adaptations—reinforced sump baffling in the Pajero Sport and upgraded cooling in the Triton/L200—and from 2021 the KH4# received updated ECU calibration for improved cold-start emissions, 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‑9HD‑A). The 7th VIN digit indicates engine family ('H' for 9HD series). All units use black valve covers with integrated PCV. Critical differentiation from 4N14: 9HD has identical displacement but features Euro 6d TEMP compliance with SCR (AdBlue) system, while 4N14 lacks SCR. ECU part numbers must match model year—pre-2021 ECUs lack updated DOC thermal logic per TSB-ENG-20-003.
The 9HD's primary reliability risk is diesel oxidation catalyst (DOC) inefficiency due to insufficient thermal cycling in short-trip urban use. Mitsubishi internal data from 2021 indicated elevated NOx emissions in early-build units before 60,000 km, while UK DVSA MOT records show increased after-treatment-related failures in city-driven examples. Extended idling and infrequent highway driving accelerate catalyst degradation, making driving pattern and ECU logic critical.
Analysis derived from Mitsubishi technical bulletins (2020–2022) and UK DVSA failure statistics (2020–2023). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about MITSUBISHI 9HD.
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