Can You Clone a Mazda CX-30 PAJ8 ECU? We Put It to the Test

Yes. We successfully cloned a Mazda CX-30 PAJ8-18-881 Mitsubishi Electric ECU using Flex in Bench mode, and the replacement ECU was installed and confirmed working in the vehicle.

Here's what we found and how we did it.

Identifying the Mazda PAJ8 ECU

The original ECU was:

Mazda: PAJ8-18-881
Manufacturer: Mitsubishi Electric
Mitsubishi Number: E6TA3071HZC
Processor: NXP MPC5746R
Original VIN: *********804

Correct identification is important because newer Mazda applications can use different ECU manufacturers and hardware families. This particular PAJ8 is a Mitsubishi Electric ECU, not Denso.

Finding the Correct Flex Protocol

Searching the exact Mitsubishi hardware number in Flex revealed dedicated support for:

E6TA3071HZC - MPC5746R - BENCH

This allowed the ECU to be accessed directly through the connectors without opening the housing.

Reading the Original and Donor

We performed multiple Full Backup reads of both the original and replacement ECUs before programming.

Flex provided two important memory areas:

Internal Flash: 4,079,616 bytes
Internal EEPROM: 262,144 bytes

Repeat reads were compared and found to be byte-for-byte consistent, giving us confidence that we had stable backups before proceeding.

The Internal EEPROM was especially important. Analysis showed that it contained vehicle-specific information, including the VIN.

Cloning the PAJ8

Both memory regions from the original ECU were transferred to the donor:

Original Internal Flash → Donor
Original Internal EEPROM → Donor

After programming, we performed another complete read of the donor rather than assuming the write was successful.

The result:

Internal Flash: 100% match to original
Internal EEPROM: 100% match to original

The donor's previous VIN was replaced by the original vehicle's VIN and associated vehicle-specific data.

Vehicle Testing

The cloned PAJ8 was installed in the Mazda CX-30 and successfully operated in the vehicle, confirming that the memory-level clone was functional.

The customer is continuing to diagnose a separate vehicle issue, but the replacement ECU itself is communicating and functioning after the clone.

This final vehicle test was important because identical files after programming prove that the memory transfer was successful, but actual vehicle operation confirms that the cloned ECU works in its intended environment.

The Important Takeaway

The Mazda PAJ8-18-881 / Mitsubishi E6TA3071HZC can be successfully cloned using Flex Bench.

For the unit we tested, a complete clone involved transferring both the Internal Flash and the 256 KB Internal EEPROM. The EEPROM contains vehicle-specific information, including the VIN, so we would not consider a Flash-only transfer equivalent to the complete cloning procedure used here.

ECU Reference

Vehicle: Mazda CX-30
ECU: PAJ8-18-881
Manufacturer: Mitsubishi Electric / MELCO
Hardware: E6TA3071HZC
Processor: MPC5746R
Programming Tool: Flex
Connection: Bench
Internal Flash: 4,079,616 bytes
Internal EEPROM: 262,144 bytes
Clone Result: Successful
Vehicle Test: Successful

Conclusion

What initially looked like a difficult Mazda ECU replacement turned out to have a straightforward cloning path once the hardware was correctly identified.

The key was searching by the Mitsubishi E6TA3071HZC hardware number rather than relying only on the Mazda PAJ8 designation. Flex identified the MPC5746R processor and provided Bench access to both the Internal Flash and Internal EEPROM.

After transferring both memories, verifying them against the original, and installing the replacement in the vehicle, the cloned PAJ8 ECU was confirmed working.

PAJ8-18-881 → E6TA3071HZC → MPC5746R → Flex Bench → Flash + EEPROM → Successful Clone