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Bosch EDC17CP68 - TC1797

Bosch EDC17CP68 - TC1797 | Error Troubleshooting FAQ

Errors

Quick access to common issues and solutions for the Bosch EDC17CP68 control unit.

[UART_CAN API] No data to read : TSW TesterPresent RX error

This error occurs due to incorrect wiring or if the BENCH access has been previously patched.

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[UART_CAN API] Failed to read TrbnSpec length bytes : [UART_CAN API] No data to read : KWP requestDownload RX error (1) @ 0xA0014000

This error indicates a failed programming attempt in BENCH mode, requiring a BOOT mode recovery.

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[UART_CAN API] No data to read : TSW TesterPresent RX error

Method: BENCH

Issue: The tool reports a communication failure, specifically a 'TesterPresent RX error', when trying to connect in BENCH mode.

Solution
  • Verify that your wiring is correct and that there are no gaps in the pin connections.
  • Check if the BENCH access has been previously patched or partially deactivated by another tool.
To understand more

This error points to a breakdown in the communication handshake between the tool and the ECU. The 'TesterPresent' message is a keep-alive signal, and an RX error means the tool isn't receiving it back, likely due to a physical wiring issue or because a previous software modification (patch) has disabled the standard BENCH communication pathway.

[UART_CAN API] Failed to read TrbnSpec length bytes : [UART_CAN API] No data to read : KWP requestDownload RX error (1) @ 0xA0014000

Method: BENCH / Recovery: BOOT

Issue: Communication was lost during a programming process in BENCH mode, resulting in a failure to read data and making the ECU unresponsive in that mode.

Solution
  • The only way to restore the ECU is to connect and read it using BOOT mode.
To understand more

When a programming sequence is interrupted in BENCH mode, critical data sectors can be left incomplete or corrupted. This corruption 'kills' the BENCH communication protocol, making it impossible to reconnect that way. BOOT mode provides a lower-level access point to the ECU's processor, bypassing the corrupted protocol and allowing for a full data read and recovery.