Marelli MJD 9DF ECU – MCU ST SPC5644A / EEPROM 95128 (FCA)

MARELLI MJD 9DF ECU – MCU ST SPC5644A / EEPROM 95128

Professional service dedicated to Marelli MJD 9DF engine ECUs with ST SPC5644A microcontroller and 95128 EEPROM, used on numerous FCA group applications.

Depending on the requested operation, the work may involve the Flash memory dump of the microcontroller or the contents of the 95128 EEPROM.

The service is available as both file processing and complete ECU service.

AVAILABLE OPERATIONS

IMMO Deactivation
Required dump: SPC5644A MCU Flash

Allows modification of the engine control unit’s immobilizer management on compatible versions.

Availability of the operation is verified based on the specific ECU software version.

IMMO Reset / Virgin
Required dump: 95128 EEPROM

Allows restoration of the ECU’s immobilizer data to a condition suitable for a new configuration or vehicle pairing procedure.

PIN Extraction
Required dump: 95128 EEPROM

Allows recovery of the PIN code stored in the control unit’s immobilizer data.

Odometer calibration
Required dump: 95128 EEPROM

Allows modification of the mileage value stored in the ECU.

It is necessary to provide the current mileage detected via engine diagnostics, the target value to be programmed and any additional information that may be requested during file verification.

Over-rev reset
Required dump: 95128 EEPROM

Allows resetting of over-rev event data stored in the control unit.

VIN Programming
Required dump: 95128 EEPROM

Allows modification of the VIN number stored in the ECU.

It is necessary to provide the original 95128 EEPROM dump and the new VIN to be programmed.

AdBlue Deactivation
Required dump: SPC5644A MCU Flash

Deactivates the software management of the SCR/AdBlue system and related diagnostic checks on compatible versions.

The modified file must first be correctly programmed into the engine ECU; only afterwards should the AdBlue control unit be disconnected.

Affected DTCs: P2044, P20EE, P2200 → P2224, P229E, P229F, P241D, U010E, U029D, U029E, U040F, U059E, U059F, U1741

DPF Deactivation
Required dump: SPC5644A MCU Flash

Deactivates the software management of the diesel particulate filter and related diagnostic checks.

Before the operation, it is necessary to verify via diagnostics the correct operation of the exhaust gas temperature sensor and the differential pressure sensor. Any faulty or malfunctioning sensors may compromise the correct operation of the modification.

Before programming, the operations required on the vehicle must also be correctly performed, including resetting via diagnostics the values related to the diesel particulate filter. At the end of the procedure, the ash value must be correctly reset and there must be no residual faults related to the DPF system.

The connectors of the probes and sensors provided by the system must remain connected and operational.

Affected DTCs: P1205, P1206, P1219, P2000, P2002, P2030 → P2033, P2080 → P2082, P2200, P242A → P242F, P2452 → P2456, P2458, P2459, P2463, P24A4, P24A7, P24A8, P24AA, P24AE, P24AF, P24B0 → P24B5, P24D0, P24D1

EGR Deactivation
Required dump: SPC5644A MCU Flash

Completely deactivates the electronic management of the EGR valve and related diagnostic checks.

On this family, the EGR OFF operation must be performed after the DPF OFF management, since in some configurations the EGR valve exclusion alone may interfere with the normal diesel particulate filter regeneration strategies.

The procedure involves mechanical exclusion of the gas passage, electrical disconnection of the EGR valve and subsequent programming of the modified file.

Affected DTCs: P0400 → P0409, P040A, P041A, P044A, P045A, P045B, P045E, P046E, P0486 → P0490, P213A, P213B, P245B

NOx sensor deactivation
Required dump: SPC5644A MCU Flash

Deactivates the electronic control of the NOx sensor on compatible configurations.

This operation is intended for vehicles not equipped with AdBlue system but equipped with NOx sensor.

Before programming the modified file, it is necessary to electrically disconnect the NOx sensor.

Affected DTCs: P2000, P2200

Particulate sensor deactivation
Required dump: SPC5644A MCU Flash

Deactivates the electronic control of the PM particulate sensor on compatible versions.

Before programming the modified file, it is necessary to electrically disconnect the PM sensor.

Affected DTCs: P14D1, P24AE, P24AF, P24B0 → P24B3, P24C6, P24C7, P24D0, P24D1, U02A3, U05A4

Start&Stop Deactivation
Required dump: SPC5644A MCU Flash

Completely deactivates the electronic management of the Start&Stop system.

No additional operations on the vehicle are required.

TVA Deactivation
Required dump: SPC5644A MCU Flash

Deactivates the electronic control of the TVA intake valve actuator.

On this family, the TVA OFF operation must be performed after the DPF OFF management, since in some configurations the TVA exclusion alone may interfere with the normal diesel particulate filter regeneration strategies.

The procedure involves mechanical locking of the intake throttle in the open position and electrical disconnection of the actuator before programming the modified file.

Affected DTCs: P0638, P0639, P2100, P2111, P2112

Speed limiter deactivation
Required dump: SPC5644A MCU Flash

Allows complete deactivation of the speed limiter managed by the engine control unit software.

The operation is available exclusively when the function is provided in the original ECU software configuration. Compatibility is therefore verified on the specific software version.

SERVICE MODALITIES

File processing

The customer independently performs the control unit reading and sends the necessary files based on the selected operations.

Depending on the operation, the following may be required:

• ST SPC5644A MCU Flash memory dump
• 95128 EEPROM memory dump

Files must be sent separately in their respective original dumps. Do not use unified backups or files saved exclusively in proprietary programming tool formats, unless otherwise indicated.

When available, it is recommended to send all contents read from the ECU as separate files, to allow a more complete verification of the control unit and the requested operation.

Once processing is complete, the modified files ready to be programmed into the ECU will be returned.

Complete ECU service

Alternatively, you can physically send the unit to Tsec Engineering.

The laboratory will directly handle ECU identification, reading of the necessary memories, compatibility verification, execution of the requested operations, programming and final testing.

Shipping the ECU to Tsec Engineering is at the customer’s care and expense. The fees selected during checkout refer exclusively to the return shipping of the processed control unit.

COMPATIBILITY AND FILE REQUIREMENTS

Marelli MJD 9DF ECUs may be equipped with different software versions and not all functions are necessarily available on every application.

The availability of individual operations is therefore verified based on the specific ECU software version and the original vehicle configuration.

The dumps sent must come from the control unit to be processed, be complete and correctly read.

Corrupted, incomplete, or previously modified files may require additional verification or may not be compatible with the requested service.

Some modifications can be applied exclusively if the affected areas of the file are still original. Any previous modifications to the same areas may prevent correct execution of the operation.

In case of doubts about the files to be read or the compatibility of your ECU, contact us before placing the order.

IMPORTANT INFORMATION

Operations that affect emission control systems, vehicle performance or speed limits may render the vehicle non-compliant with applicable regulations.

Such operations must be used exclusively in the contexts and conditions permitted by current regulations. It is the customer’s responsibility to verify the compliance of vehicle use in the country where it is operated.

The availability of the indicated DTCs may vary depending on the specific software version and vehicle configuration.

Any ECU shown in the images is for illustrative purposes and is not included with the product.