Japanese Diesel ECUs: Denso & Transtron Guide for Kubota, Hino, Isuzu, Yanmar, Fuso and Construction Machines

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Japanese machines are built to run for decades, and most of them do - a Kubota tractor, a Hino or Isuzu truck, a Kobelco or Hitachi excavator keeps working long after the warranty and far from the market it was built for. The emission hardware is a different story. A soot counter that keeps asking for a parked regeneration, an EGR valve full of carbon, an AdBlue module counting down to limp mode on a site with no dealer within 500 km - that is what brings these machines to a workshop.

This guide maps which Japanese engine uses which control unit, and which machines carry that engine - including the many European and American brands that run on Kubota, Isuzu, Hino and Yanmar engines. Every ECU named here is one we hold files for. The counts in the tables are live pages in our solutions database, and Japanese makes are a real part of our work: about 13 % of all the files we deliver are for Japanese trucks, machines and pickups.

Why Japanese machinery needs its own guide

On paper Japanese machinery looks simple: a handful of big manufacturers, long model cycles, conservative engineering. In the workshop it is less simple, for three reasons.

1. The engine makers sell to everybody

Kubota, Isuzu, Yanmar and Hino are not only vehicle brands - they are some of the biggest independent diesel engine suppliers in the world. A Kubota V2403 or V3800 powers Kubota tractors and loaders, but also Bobcat, Takeuchi, Manitou, Dieci, Hyster and Yale machines. An Isuzu 4HK1 or 6HK1 sits in Hitachi, CASE, Link-Belt, Sumitomo, Hidromek, Sany and John Deere excavators. Hino J05 and J08 engines power Kobelco and New Holland excavators. Yanmar TNV engines are in Takeuchi, Yanmar and many compact machines.

The ECU follows the engine. In our database the same software version often lists several makes at once - a Denso SH7058 file for a Kubota-engined loader is the same whether the machine is painted orange, yellow or white. So the rule is: identify the engine and the ECU, not the machine.

2. Denso and Transtron - and why "Hitachi" is not an ECU here

Denso supplies the engine control units for Kubota, Hino, Mitsubishi Fuso's Denso-era engines, Toyota and most older Isuzu units. Transtron - Isuzu's own electronics company - supplies the ECU for every current Isuzu diesel, and therefore for every machine with an Isuzu engine.

A frequent mix-up: customers write "Hitachi ECU" for a Hitachi excavator. Hitachi does make engine control units (Hitachi Astemo), but those are mostly in petrol Nissan, Infiniti, Renault and Subaru cars. A Hitachi ZX excavator runs a Transtron if it has an Isuzu engine, a Cummins CM2350 on the ZW wheel loaders, and a Bosch EDC17CV52 on some wheeled models. The same applies to Kobelco: the ECU is Denso (Hino engine), Transtron (Isuzu engine) or Bosch (Yanmar engine), never "Kobelco".

3. Japanese badge, non-Japanese ECU

Do not assume Denso just because the machine is Japanese:

• Komatsu engines come from the Komatsu-Cummins partnership: Cummins CM2350 / CM2250 / CM850, plus Bosch EDC17CV41 / CV44 / CV54. See our Komatsu Forest article.
• Mitsubishi Fuso Canter - Bosch EDC16C31, EDC17CP15 / CP52 / C49, EDC17CV54, MD1CC878; heavy Fuso with Mercedes engines use Continental MCM/ACM (article).
• UD Trucks Condor and Quon - TRW EMS2.2, EMS2.3 and EMS2.4, the Volvo group platform (article).
• Kubota L60 and MX - Bosch EDC17C55 / EDC17CV45. Yanmar Tier 4 final engines - mostly Bosch EDC17CV54. Isuzu Giga Euro 6 - Bosch MD1CE108.

Brand - models - engine - ECU - versions we hold

The last column is the number of software versions currently published for that make in our solutions database (all ECU makers together). Click the make to see every version with its software number, the vehicles it belongs to and the price for that file. Live prices in the file service are always the authoritative ones.

Trucks and buses

* The Mitsubishi page also includes L200, Pajero and Triton; the Nissan page includes Navara, Titan and other models.

Agriculture

Construction and material handling

Machines of other brands with Japanese engines

The number here is how many Denso and Transtron versions we hold for the make - their Bosch, Cummins and Delphi versions are on the same page.

Pickups, SUVs and vans

Toyota Hilux and Land Cruiser, Isuzu D-Max and MU-X, Mitsubishi L200 / Triton and Pajero, Nissan Navara and Patrol, Mazda BT-50 - the workhorses of Africa, the Middle East, Australia and Latin America - are a large share of our Japanese work. Toyota uses Denso (NEC and Gen3 RH850), Mitsubishi Denso SH7058 / SH7059 / SH725x, Isuzu Transtron on the 3.0 4JJ3 and Bosch MD1 on the 1.9, Nissan and Mazda a mix. They get their own guide: Japanese pickups ECU guide.

The ECU families in detail

Denso SH7055 / SH7058 / SH7059

The workhorse generation - Renesas SuperH processors, roughly 2003 to 2012, Euro 4 / Tier 3 to early Euro 5 / Tier 4 interim. If the machine has a common-rail Japanese diesel from that period, this is the most likely ECU.

• Where: Hino 300 / 500 / 700 and Ranger, Isuzu N- and F-series, Mitsubishi Fuso Canter 6M60 and Fighter, Kubota tractors and loaders, Kobelco SK170-SK350 with Hino engines, Hyundai HD65 / HD72 / HD78 / County, Nissan Atlas and Cabstar, Renault Maxity, Toyota Coaster, GMC W3500 / C7500 with Isuzu engines, Cat compact machines, Mitsubishi L200 and Pajero.
• In our database: SH7058 - 263 versions, SH7059 - 22, SH7055 - 6.
• Typical prices: Hino - DPF 95 EUR, EGR 85 EUR, AdBlue 180 EUR, Stage 1 160 EUR; Isuzu - 105 / 95 / 190 / 140 EUR; Kubota - 120 / 95 / 220 / 160 EUR; Kobelco - 105 / 95 / 200 / 160 EUR.
• Hino dealer packages: on Hino J05E / J08E with SH7058 we can work directly on the files read by the dealer tool DX3 - no bench read needed. See Hino DX3 dealer files.

Denso SH725x / SH7254x / SH72543 / SH72546 / R5F72546R

The next generation - SH-2A processors, from about 2010, Tier 4 and Euro 5 / Euro 6 with DPF and, on bigger engines, SCR. Different names on the label (SH7254x, SH72543, SH72546, Renesas R5F72546R, R5F72543R) are the same family with different memory sizes.

• Where: Kubota V2403 / V3307 / V3800 / V6108 tractors (B, BX, L, M, M7), SVL and SSV loaders; Hino 200 / 300 / 500 and US 155-338; Isuzu NPR / NQR 2008+; Takeuchi; Dieci; Hyundai light trucks and vans; Volvo CE compact machines; Wacker Neuson, Genie and Perkins 404-powered equipment.
• In our database: SH7254x - 57, SH725x - 35, R5F72546R - 30, SH72546 - 24, SH72546R - 10, SH72543 - 6, R5F72543R - 3, SH72531 - 4.
• Typical prices: Kubota - DPF 120 EUR, EGR 95 EUR, AdBlue 220 EUR, Stage 1 160 EUR; Hino - 95 / 85 / 180 / 120-160 EUR; Isuzu SH72546 - 95 / 105 / 190 / 120 EUR.
• Typical jobs: DPF off together with the soot counter and the service (parked) regeneration request - the most common Kubota M Series request we get; EGR off; AdBlue off on M7 and bigger engines.

Denso Gen2 1N83M (MPC5746R)

Denso's newer platform with a PowerPC-type MPC5746R processor - Euro 6 / Stage V. Often paired with a separate AdBlue module (ACM / DCU17), which then has to be read as well.

• Where: latest Isuzu NPR / NQR, Hino, Manitou MH 4.6, Kobelco, Hyundai, XCMG cranes and trucks, JCB, Merlo, Ashok Leyland.
• In our database: 1N83M - 53 versions.
• Typical prices: Isuzu - DPF 160 EUR, EGR 105 EUR, AdBlue 270 EUR, Stage 1 160 EUR; machines with ACM DCU17 - DPF 180 EUR, EGR 105 EUR, AdBlue 280-320 EUR. Bigger flash, separate AdBlue unit, more checks - which is why it costs more than the SH705x generation.

Denso DC1U - Kohler KDI engines

Kohler's KDI diesels (built in Italy, 1.9 to 3.4 litre) are controlled by a Denso DC1U. Because KDI engines are sold to dozens of OEMs, the same ECU turns up in very different machines.

• Where: JCB 407SV, 525-60 Loadall and 85Z; Merlo P27.6 and 30.8; Avant 755i / 860i; Iseki SF237 and TEL3410H; McCormick X2 / X3; Massey Ferguson 1835; John Deere 5075E; Durso, Rotair, TR, Powergrab; GNR and Megasilent gensets.
• In our database: DC1U - 29 versions, mostly listed under Kohler.
• Typical prices: DPF 180 EUR, EGR 105 EUR, AdBlue 280 EUR, Stage 1 140 EUR.

Denso in Caterpillar, John Deere and Perkins compact machines

Cat's compact range (C2.2, C3.3B, C3.6 and C3.8 engines) uses Denso units with part numbers 275700-xxxx, 112500-xxxx and 1J430-xxxxx, and on the newest machines Denso A6E10 / A6E11. John Deere 331G / 333G compact track loaders and Perkins 403 / 404 engines carry the same Denso families.

• Where: Cat 226D-299D skid steers and track loaders, 305 CR-315 GC excavators, 906-908 wheel loaders, D3 dozer, 434 backhoe, Cat 2.2 gensets; JD 331G / 332G / 333E / 333G.
• In our database: A6E11 plus Cat entries on the SH7058 / SH725x pages - 19 Denso versions for Caterpillar.
• Typical prices: DPF 180 EUR, EGR 105-120 EUR, AdBlue 290 EUR, Stage 1 140-160 EUR (Cat); DPF 120 EUR, EGR 95 EUR, AdBlue 240 EUR, Stage 1 140 EUR (JD).

Transtron - every Isuzu engine

Transtron is Isuzu's own electronics company, and its ECU controls Isuzu's diesels wherever they are fitted. On the label and in tools you will see Transtron with the engine code - 4HK1, 4JJ1, 4JJ3, 6HK1, 6UZ1, 6WG1 - or with the processor (SH7055, SH7058, SH7059, SH72544, SH725x, TC265 on the latest D-Max).

• In our database: 249 Transtron versions - Isuzu 107, Hitachi 49, CASE 38, Link-Belt 11, Hidromek 10, Sany, Kobelco, John Deere, Kato, JCB.
• Typical prices: DPF 85 EUR, EGR 70 EUR, AdBlue 190 EUR, Stage 1 95-140 EUR - the most affordable Japanese platform.
• Separate AdBlue unit: on Isuzu Grafter, newer N-series and many Stage V excavators the AdBlue system has its own DCU. Send both reads.

Denso in pickups and light vans

Toyota's D-4D diesels in the Hilux, Land Cruiser 200 / Prado, Fortuner and HiAce use Denso units with NEC processors, and since about 2015 the Gen3 RH850 (R7F701202 / R7F701216). Mitsubishi L200 / Triton and Pajero 2.4 / 2.5 / 3.2 DI-D use Denso SH7058 / SH7059 / SH725x. Prices on these are car-level: DPF 80-95 EUR, EGR 70-85 EUR, AdBlue 150-190 EUR, Stage 1 95-105 EUR. Details per model in the pickups guide.

Keihin, Mitsubishi Electric, Hitachi Astemo

The other Japanese ECU makers are mostly outside diesel machinery. Keihin (1 046 versions) and Mitsubishi Electric (637) are on Honda, Yamaha, Kawasaki, Suzuki, Triumph and KTM motorcycles, quads and outboards - covered in our motorcycle, ATV and UTV guide. Hitachi Astemo controls petrol Nissan, Infiniti, Renault and Subaru engines. Denso also makes the Volvo VEA engine units - see Volvo Denso VEA Gen2.

One engine, many badges

This is the table to keep at the workbench. Find the engine, and you know the ECU family and every other machine that shares it.

By vehicle type

Light and medium trucks

Isuzu Elf / NPR / NQR, Hino 300 / Dutro, Fuso Canter and Hyundai HD are delivery and municipal trucks: short trips, idling, low exhaust temperature. The DPF clogs, the truck asks for a parked regeneration that never finishes, and the EGR cooler fills with carbon. DPF and EGR off with the regeneration logic and the soot counter disabled is the standard job; on newer Isuzu and Hino with a separate AdBlue unit we also need the DCU read. Brand guides: Isuzu, Hino, Mitsubishi Fuso and UD.

Buses

Toyota Coaster and Hino buses (Denso SH7058), Isuzu Novo and Visigo (Transtron, Denso SH7059, Cummins CM2350 on the 4.5 / 6.7 ISB), Hyundai County (Denso). Fleets usually ask for EGR and DPF off plus an ECO file rather than more power.

Tractors and compact equipment

Kubota is the big one: the M Series with V3800 and V6108 engines (DPF, EGR and on bigger models AdBlue), L and B / BX with V2403 (DPF and EGR), SVL track loaders. The usual complaint is a DPF that keeps asking for service regeneration - we switch off the regeneration and the soot counter together with the filter, so the request does not come back. See the Kubota guide.

Excavators and loaders

Hitachi, CASE, Link-Belt and Sumitomo excavators with Isuzu engines (Transtron), Kobelco with Hino engines (Denso SH7058), Takeuchi with Kubota and Yanmar engines, Komatsu with Cummins and Bosch. Stage V machines often have a separate AdBlue DCU. See the Japanese construction machines guide.

Gensets and stationary engines

Kohler KDI gensets (Denso DC1U), Cat 2.2 gensets (Denso A6E10), Isuzu-powered generators (Transtron). Usually an EGR / DPF job plus selective fault codes.

What we do for workshops

We are a file service for professional workshops and tuners: you read the ECU, we modify the file, you write it. We do not work with end customers and we do not sell hardware.

Two control units, one job. On Stage V machines and the newest trucks the AdBlue system often has its own module. Attach both reads to the order, and clear every AdBlue warning and countdown before writing the file - a stored inducement state is the most common reason a finished file still shows warnings.

Prices above are indicative ranges from our current price list. The exact figure for your machine is shown in the file service and on the version page in the solutions database.

How to read the ECU and order the file

Step 1 - identify the unit, not the machine

1. Read the label on the ECU. Denso units carry a Denso number (275700-xxxx, 275800-xxxx, 112500-xxxx) and often the vehicle maker's part number - Hino and Toyota 89661- / 89663-xxxxx, Kubota 1J- / 1G-xxxxx, Isuzu 8-98xxxxxx-x. Transtron units show Transtron and the Isuzu part number.
2. Or let the tool identify it. Once connected, the tool reports the ECU type and the software number.
3. Search the software number in our solutions database. If the version is listed, you see the vehicles it belongs to and the price for that file.

Step 2 - read it properly

• Tools: we work with reads from Alientech KESS3 and K-TAG, New Genius, Magic FLEX, CMD, FGTech, PCMflash and other common tools. Tell us which tool you have and we will tell you which read to send.
• Bench or boot: some of these units read on the bench, others only in boot mode. Follow your tool's connection diagram for the exact ECU.
• Hino with DX3: if you have the dealer tool, the dealer package it reads is enough - see how.
• Use a stable power supply. A dropping battery during a write is how ECUs get bricked.
• Always keep the original read, with the VIN or serial, engine number and software ID. If the file was already modified by someone else, tell us and send the original if you have it.

Step 3 - order at fs.auto-remap.com

1. Log in or create a free workshop account. No subscription, you pay per file.
2. Start a new order and pick the brand. Mind the spelling we use: Mitsubishi Fuso (not Mitsubishi) for trucks, UD Truck for UD, Isuzu for trucks, buses and pickups. For a machine with a Japanese engine, pick the machine brand (CASE, Link-Belt, JCB) and the ECU type.
3. Select the model, engine and ECU type - this is what sets the price.
4. Upload the read (and the AdBlue module read if there is one), tick the options and write what matters in the comment: Stage 1 or ECO, AdBlue off or reduction, which codes to disable, whether the DPF is already removed.
5. Receive the modified file, ready to write. Support stays open until the machine runs clean.

Version not in the list? Send the read anyway. Much of our Japanese database was built from reads sent in by workshops, and new versions are usually added the same day.

Frequently asked questions

Deep dives and older articles

Brand-by-brand guides with the exact model and software lists:

• Kubota tractors and loaders: Denso SH725x, SH7058 and Bosch EDC17
• Hino 300, 500 and 700: Denso SH7058, SH72543, 1N83M
• Isuzu trucks and Isuzu-engined excavators: Transtron and Denso
• Mitsubishi Fuso and UD Trucks: Denso, Bosch and TRW
• Kobelco, Takeuchi, Hitachi, Komatsu and Yanmar machines
• Hilux, Land Cruiser, D-Max, L200 and Navara pickups
• Hino DX3 dealer files: modification without a bench read

Related articles published earlier:

• Chinese trucks, buses and construction machines: ECU guide - the same Denso and Transtron units on Howo, XCMG and Sany.
• Komatsu Forest: EDC17 and MD1, SCR, DPF and EGR.
• Volvo, Renault and Mack with TRW EMS2 - the platform under UD Condor and Quon.
• Mercedes OM93x / OM47x, Fuso Canter and Shogun with Continental MCM / ACM.
• AdBlue consumption reduction by file modification.
• How the SCR system works and how the catalytic coated DPF works.

Ready to order? Go to fs.auto-remap.com, pick the brand and the ECU type, upload your read and tick the options. Not sure which entry to choose? Send the read and we will tell you.

File service for professional tuners and workshops.

Prices are indicative and taken from our current price list; the figure shown in the file service at the time of ordering applies. Emission-related modifications are supplied for off-road, motorsport, export and research use only, in territories where such modification is permitted. It is the customer's responsibility to comply with local legislation.