F-DO Test Stop Fault (CU)

What does F01773 mean?

A fault has occurred during the test stop procedure on the Control Unit (CU) side, specifically related to the evaluation of states for Fail-safe Digital Outputs (F-DOs). This indicates that the expected states of the DOs or diagnostic DOs were not fulfilled, or an internal timer/state issue occurred, often a mismatch between expected and read-back signals during a test state.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Analyze the fault value (W_V_XYYZZ) to understand the specific state mismatch (expected vs. read back) and the exact test stop state where the fault occurred.