Marelli ECU coverage in Map Decoder
- Supported ECU models
- 5
- ECU families
- 1
- Distinct solutions
- 10
- Mapped DTC codes
- 1,003
Map Decoder holds map definitions and measured file data for 5 control units from Marelli. Coverage is built from real files: each supported operation comes from a modification that was learned by comparing an original and a modified binary, then verified against the target file before it is offered.
Marelli ECU families
- MJ2 ECUs
Operations available on Marelli ECUs
AdBlue / SCR Off
Turns off the SCR / AdBlue dosing strategy and its countdown logic in Marelli ECUs.
DPF Off
Removes diesel particulate filter regeneration and monitoring logic from Marelli ECUs files.
EGR Off
Disables exhaust gas recirculation control in Marelli ECUs calibrations, including the related fault reporting.
Lambda / O2
Disables lambda / O2 sensor monitoring in Marelli ECUs without breaking fuelling.
MAF Off
Removes mass air flow sensor dependency and its diagnostics from Marelli ECUs.
NOx Off
Disables NOx sensor monitoring and the associated fault paths in Marelli ECUs.
Speed Limiter (VMAX) Off
Removes the top speed limiter from Marelli ECUs.
Stage 1
Software-only performance calibration for Marelli ECUs, with the supporting limiter changes.
Start-Stop Off
Permanently disables the automatic start-stop function in Marelli ECUs.
Throttle Valve (TVA)
Disables throttle valve actuator control and monitoring in Marelli ECUs.
Marelli ECU tuning — frequently asked questions
Which Marelli ECUs does Map Decoder support?
5 control units from Marelli are covered, grouped into MJ.
What operations are available on Marelli ECUs?
Across supported models: AdBlue / SCR Off, DPF Off, EGR Off, Lambda / O2, MAF Off, NOx Off, Speed Limiter (VMAX) Off, Stage 1, Start-Stop Off and Throttle Valve (TVA). Availability differs per ECU and is listed on each model page.
How does Map Decoder know a patch fits my file?
Every stored modification carries anchor signatures and a region fingerprint. The uploaded binary is compared against them before a patch is offered, so a modification learned on one software version is not blindly applied to another.
Does Map Decoder handle Marelli checksums?
Yes. Checksum correction for the regions a patch changes is applied automatically as part of patch generation.
Tune Marelli ECUs
Map Decoder analyses Marelli ECU files, detects the maps and generates a verified patch with the checksum corrected.