OBDSTAR DC706 Read BYD Delphi MT22.1 ECU on Bench

 OBDSTAR DC706 read and write BYD Delphi MT22.1 Denso ECU on bench successfully.

I’ll walk through my experience reading and cloning a Denso MT 22.1 ECU using the Obdstar DC706 tool. This process involves bench reading, VIN writing, and troubleshooting common issues—helpful for locksmiths, mechanics, and automotive enthusiasts.

Step-by-Step Process

1. Connecting to the ECU

• The Denso MT 22.1 ECU was initially attempted with Xhorse Multi prog, but it required boot mode, which was unnecessary with the Obdstar DC706.

• Using a K-line connection, the Obdstar successfully established communication with the ECU.

2. Reading the ECU Data

• The reading process was slow due to the K-line protocol but stable.

• The tool first writes a bootloader before extracting the flash data, ensuring compatibility.

• A key advantage of the Obdstar DC706 is its ability to read and write VINs, useful for virgin ECUs or replacements.

3. Handling a Virgin (New) ECU

• The new ECU had no pre-written VIN, so the plan was:

  1. Read and save the flash data for future use.

  2. Write the correct VIN if the original ECU couldn’t be read.

• Avoiding physical opening (desoldering) was preferred to preserve the ECU’s integrity.

4. Troubleshooting and Next Steps

• If the original ECU couldn’t be read via bench mode, boot mode (desoldering) would be the fallback.

• The saved flash data from the new ECU could be reused for future cloning jobs.

Key Observations

Obdstar DC706 Benefits:

• Works without opening the ECU (bench mode).

• Allows VIN writing, essential for new or replacement ECUs.

• More user-friendly than Multiprog for this application.

Challenges:

• Slow reading speed due to K-line communication.

• Boot mode may still be needed for problematic ECUs.