Magneti Marelli ECU — the Italian FCA platform (Fiat/Alfa/Lancia, Multijet diesels and JTDM petrols) — found only on Citroen (one modification). On the Marelli MJD9, CHIPOK performs Stage 1 — power tuning, software removal of the diesel particulate filter, EGR, AdBlue, catalyst control, disabling the intake flaps, speed limit removal and DTC removal, return to stock, oil pressure optimization. Flashing is done via KESS3 / Autotuner / CMD Flash / FGTech Galletto.
The Marelli MJD9 unit is found on 1 different engine. Main brands: Citroen (1).
The Marelli MJD9 ECU supports: STAGE 1, LAMBDA OFF, EXT FLAPS OFF, ECO TUNING, ADBLUE OFF, CHECK STOCK OR NOT, DPF OFF, DTC OFF, VMAX OFF, OIL PRESSURE OPTIMIZATIONS. Checksums are recalculated on the engineer's side in WinOLS5.
The Marelli MJD9 is supported by: KESS3, Autotuner, MPPS, KTAG, CMD Flash, Trasdata, MagicMotorSport. On production models OBD reading is usually enough; on locked variants — Bench (BDM/JTAG).
Stage 1 on the diesel Marelli MJD9 reprograms rail pressure target, SOI/EOI timing, boost target, smoke limiter and torque limiter. The torque gain is noticeable; the HP gain depends on the specific engine.
The original bin/hex/ori is accepted after reading via KESS3 / KTAG / Autotuner / MagicMotorSport. Checksums are recalculated on the engineer's side.
OBD flashing of the Marelli MJD9 — 25-30 minutes, Bench (if needed) — about an hour. The file processing itself takes 5-30 minutes after receipt.
The cost of a Marelli MJD9 file is built in the calculator: you pick the operations you need (Stage 1, emissions removals, service operations) and the price is calculated with the package discount applied.