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Hitachi BED43x - SH72533

Hitachi BED43x - SH72533 ECU | Errors & Solutions

Errors

Quick access to common issues and solutions for the Hitachi BED43x ECU family.

7F-10-22 KWP DiagnosticSessionControl RX error

This error occurs because the ECU's required pre-programming conditions, such as correct voltage or ignition status, have not been met.

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7F-10-22 KWP DiagnosticSessionControl RX error

Method: OBD

Issue: The tool reports an RX error and cannot start the programming session with the ECU via the diagnostic port.

Solution
  • Consult the HELP section within the bFlash software for this specific protocol.
  • Carefully verify and meet all listed conditions (e.g., battery voltage, ignition status, engine temperature) before re-attempting the operation.
To understand more

ECUs require a specific set of environmental and system conditions to be met before they will allow write access to their memory. This is a critical safety feature to prevent data corruption. The 7F-10-22 error is a generic refusal from the ECU, indicating that one of these prerequisites, which are detailed in the protocol's HELP section, is not satisfied.