When to use no fault found or no defect found?
When to use no fault found or no defect found? No fault found (NFF), no trouble found (NTF) or no defect found (NDF) are terms used in the field of maintenance, where a unit is removed from service following a complaint of a perceived fault by operators or an alarm from its BIT Can you do a diagnostic without a trouble code? Throughout the years, more emission related systems and components have been incorporated to the list of computer monitored systems. Still, some performance and driveability problems can appear without the computer setting any DTC. So you need a different...