Diagnosis before action
The code and its contextual data are analysed first.
Exceptional treatment of a fault code only after mandatory diagnosis and root-cause repair.
DTC OFF must never be used to conceal an active fault. The code, triggering conditions and root cause are diagnosed, and all necessary repairs must be completed before any limited, justified software treatment is considered.
The code and its contextual data are analysed first.
Only specifically agreed DTCs may be considered.
Critical faults and protection functions are not hidden.
Read all DTCs, freeze-frame data, measurements and history.
Identify and document correction of the mechanical or electrical root cause.
Only if justified, apply targeted treatment and run full post-flash diagnostics.