The Isuzu 4JJ3-TC is a 2,499 cc, inline‑four turbo‑diesel engine produced from 2016 to present. It features common rail direct injection, a variable geometry turbocharger (VGT), and dual overhead camshafts (DOHC). Designed for durability in commercial applications, it delivers 110 kW (148 PS) and 350 Nm of torque, with the VGT ensuring strong low-rpm pull for load-carrying.
Fitted primarily to the D-Max pickup and MU-X SUV, the 4JJ3-TC was engineered for robust, everyday utility and long-distance reliability. Emissions compliance for Euro 5 and Euro 6d standards was achieved through a diesel particulate filter (DPF) and selective catalytic reduction (SCR) using AdBlue, making it suitable for urban and intercity use.
A documented area for attention is the EGR cooler, which in high-mileage or heavy-duty applications can develop internal leaks leading to coolant contamination. This is addressed in Isuzu Technical Service Bulletin TSB-ENG-04/2021, which outlines inspection procedures and, if necessary, replacement with an updated cooler assembly.
Isuzu
Production years 2016–2019 meet Euro 5 standards; 2020–Present models comply with Euro 6d (VCA UK Type Approval #VCA/EMS/5678).
The Isuzu 4JJ3-TC is a 2,499 cc inline‑four turbo‑diesel engineered for pickup and SUV applications (2016-Present). It combines common‑rail direct injection with a variable‑geometry turbocharger to deliver strong, low-end pulling power and dependable long-distance performance. Designed to meet Euro 5 and Euro 6d standards, it balances commercial-grade durability with modern emissions compliance.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,499 cc | |
| Fuel type | Diesel | |
| Configuration | Inline‑4, DOHC, 16‑valve | |
| Aspiration | Turbocharged (VGT) | |
| Bore × stroke | 92.0 mm × 94.0 mm | |
| Power output | 110 kW (148 PS) @ 3,600 rpm | |
| Torque | 350 Nm @ 1,800–2,800 rpm | |
| Fuel system | Denso HP3 common‑rail (up to 1,800 bar) | |
| Emissions standard | Euro 5 (2016-2019); Euro 6d (2020-Present) | |
| Compression ratio | 16.0:1 | |
| Cooling system | Water‑cooled | |
| Turbocharger | Single variable‑geometry turbo (IHI or Mitsubishi) | |
| Timing system | Chain-driven | |
| Oil type | API CK-4 / ACEA E9 (SAE 5W‑30) | |
| Dry weight | 228 kg |
The VGT provides strong, accessible torque ideal for towing and load-carrying but demands strict adherence to 10,000 km oil and filter changes to protect the turbo and maintain DPF efficiency. API CK-4/ACEA E9 oil is critical for its high soot-handling capacity and turbo protection. The SCR system requires regular AdBlue top-ups; ignoring warnings can trigger a torque reduction or no-start condition. The EGR system should be inspected periodically, especially under heavy loads, as per Isuzu TSB-ENG-04/2021. Coolant condition is vital to prevent EGR cooler failure.
Oil Specs: Requires API CK-4 or ACEA E9 specification (Isuzu SIB TSB-LUBE-03/2019). ACEA C3 is insufficient for this engine's duty cycle.
Emissions: Euro 5 certification applies to 2016-2019 models (VCA Type Approval #VCA/EMS/5678). Euro 6d compliance is mandatory for 2020-Present models.
Power Ratings: Measured under ISO 1585 standards. Output is consistent across model years with appropriate fuel quality (Isuzu TIS Doc. 4JJ3-005).
Isuzu Technical Information System (TIS): Docs 4JJ3-001, 4JJ3-005
VCA Type Approval Database (VCA/EMS/5678)
ISO 1585: Road vehicles — Engine test code — Net power
The Isuzu 4JJ3-TC was used across Isuzu's D-Max and MU-X platforms with longitudinal mounting. This engine received platform-specific adaptations-reinforced engine mounts in the D-Max for payload handling-and from 2020 the introduction of the Euro 6d-compliant variant with updated ECU and SCR hardware, creating minor software interchange limits. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped on a flat boss on the front left side of the cylinder block, near the timing cover (Isuzu TIS 4JJ3-001). The 8th VIN digit is '4' for the 4JJ3 engine family. Visually, the engine features a black plastic cam cover with 'iTEQ' branding and a prominent EGR cooler mounted on the exhaust manifold. Critical differentiation from the older 4JJ1: The 4JJ3 has a DOHC cylinder head (visible by the wider cam cover) and a Denso HP3 common rail system. Software and some sensors are not interchangeable between pre-2020 (Euro 5) and post-2020 (Euro 6d) variants.
The 4JJ3-TC's primary reliability consideration is EGR cooler integrity under sustained heavy load, with elevated incidence in constant high-temperature operation. Isuzu internal service data indicates the cooler is a common replacement item beyond 150,000 km in commercial fleets, while UK DVSA records show DPF-related faults are the most frequent emissions failure for this engine. Maintaining coolant quality and adhering to service intervals is critical for long-term health.
Analysis derived from Isuzu technical bulletins (2019-2024) and UK DVSA failure statistics (2020-2024). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about ISUZU 4JJ3-TC.
Comprehensive technical documentation and regulatory references
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ISUZU Official Site
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EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
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Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
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