| Faults occurring in monitored sensors and components are stored in the fault memory together with an indication of the type of fault. |
| The first step in the fault-finding process is always to start self-diagnosis and interrogate the faults stored. This can be implemented by way of the following: |
| t
| Vehicle diagnostic, testing and information system -VAS 5051A- |
| t
| Vehicle diagnostic and service information system -VAS 5052- |
| t
| Fault reader -V.A.G 1551- |
| t
| Vehicle system tester -V.A.G 1552- |
| The fault information displayed is used in conjunction with a fault table (containing information on possible causes of trouble) to perform pin-pointed repair measures. |
Note | t
| If a fault situation exists for longer than a certain period, the fault is stored as being static. If the fault situation is then no longer detected for a pre-determined period, the fault is re-classified as being sporadic. This process is constantly repeated. Sporadic faults are additionally identified as such by /SP on the display. |
| t
| A sporadic fault is erased automatically if it no longer occurs for a pre-determined period. |
| The self-diagnosis options can only be utilised by employing the vehicle diagnostic, testing and information system -VAS 5051A-, the vehicle diagnostic and service information system -VAS 5052-, the fault reader -V.A.G 1551- or the vehicle system tester -V.A.G 1552- in mode “1” (Rapid data transfer). |
| Self-diagnosis is not restricted to storage, interrogation, erasing and final control diagnosis. It also has basic setting, control unit identification, adaption and encoding functions. |
| Mode “2” (flash code output) is not available for the air conditioner/heater electronics. Modes “3” (self-test) and “4” (workshop code) only apply to the fault reader -V.A.G 1551- and the vehicle system tester -V.A.G 1552- and are described in the relevant operating manuals. |
|
|
|
