Marelli MJD9DF: Magneti Marelli ECU — the Italian FCA platform (Fiat/Alfa/Lancia, Multijet diesels and JTDM petrols). Stage 1 for power, removal from the logic of the diesel particulate filter (DPF), the EGR system, the AdBlue system, the catalytic converter/lambda, disabling the swirl flaps, Speed Limit Off and DTC Off, rollback to the factory calibration, oil pressure optimization — Autotuner, KESS3 (OBD), KTAG (bench), Trasdata. In the database — 36 modifications on Fiat, Opel, Alfa Romeo and 3 more brands.
The Marelli MJD9DF unit is found on 36 different engines. Main brands: Fiat (25), Opel (5), Alfa Romeo (2), Citroen (2), Lancia (1).
The Marelli MJD9DF ECU supports: STAGE 1, LAMBDA OFF, EXT FLAPS OFF, ECO TUNING, ADBLUE OFF, DPF OFF, DTC OFF, VMAX OFF, OIL PRESSURE OPTIMIZATIONS, EGR OFF. Checksums are recalculated on the engineer's side in WinOLS5.
The Marelli MJD9DF 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 MJD9DF 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 Autotuner, MPPS, MagicMotorSport, KT200, FoxFlash. Checksums are recalculated on the engineer's side.
OBD flashing of the Marelli MJD9DF — 25-30 minutes, Bench (if needed) — about an hour. The file processing itself takes 5-30 minutes after receipt.
The cost of a Marelli MJD9DF 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.