Mitsubishi L200, Pajero and ASX Denso ECU Files: Original, Immo Off, DPF and EGR Solutions

Mitsubishi’s diesel range of the last twenty years runs on Denso engine ECUs: the L200 / Triton 2.5 DI-D (4D56) and 2.4 DI-D (4N15), the Pajero / Shogun 3.2 DI-D (4M41), the ASX, Outlander and Lancer 1.8 / 2.2 DI-D (4N13 / 4N14). Requests for a Mitsubishi L200 ECU file usually come from three directions: a bricked unit after a failed tuning attempt, a used ECU that will not pair, and DPF or EGR trouble on high-mileage pickups.

Identifying the Denso ECU

The label shows a Mitsubishi number 1860Axxx or 1860Bxxx and a Denso number 275800-xxxx / MB-xxxx. Both matter: the same Denso hardware serves several engines and markets, and the Mitsubishi number identifies the calibration. The early 4D56 units (2006–2009) use a Denso 32-bit SH7055 ECU; 2010 onward moved to SH7058/SH72543 platforms with a larger flash.

Reading and writing

1. OBD: KESS V2 reads and writes most Denso SH7055/SH7058 Mitsubishi units over OBD (Denso protocol, K-line or CAN depending on year). Reliable on the 4D56 L200 and 4M41 Pajero.
2. Bench: KTAG and Flex read the newer SH72543 units (4N13/4N14/4N15) on the bench; Flex also covers most of the older ones without opening the case.
3. Boot: for a unit that no longer communicates; New Trasdata or KTAG in boot mode with the case open.

Which file for which problem

• Original file — full stock read for recovery after a failed flash or to remove an unknown tune. Denso units on Mitsubishi are sensitive to interrupted OBD writes; a bench restore with the original brings them back.
• Immo off — the Mitsubishi immobilizer (MUT/ETACS) pairs the key, ETACS and ECU. A used ECU cranks without starting; immo off removes the check. Virgin/pairing with MUT-III is possible on some generations.
• DPF off — the 4D56 and 4N15 pickups with DPF suffer from failed regenerations under short-trip use; a DPF solution removes the regeneration logic and the related codes (P2002, P244A, P2463). Check local regulations first.
• EGR off — the 4D56 is famous for EGR carbon build-up; an EGR solution stops the valve duty and the P0401/P0403 codes after the valve is blanked.

Practical notes

• Always keep a stabilised supply during OBD writes on Denso ECUs — the write is long and a voltage dip is the main cause of bricked units.
• After an ECU change on common-rail 4N engines, enter the injector ID codes with MUT-III.
• Australian, Thai and European L200 calibrations differ; use the Mitsubishi number, not just the engine code, when ordering.

Find your file

Browse Mitsubishi files or the wider Denso ECU collection; original, immo off, DPF off and EGR off solutions are listed by Mitsubishi part number. Not listed? Send your read through the file request form.