| Features of self-diagnosis |
| The engine control unit (control unit for Motronic -J220- is equipped with a fault memory. |
| If faults occur in the sensors and components being monitored, they will be stored in the fault memory together with an indication of the type of fault. |
| Faults which only occur sporadically are printed with the addendum “sporadic fault.” These faults will be indicated on the display by the addendum “/SP”. The cause of sporadic faults can be due to a loose contact or an intermittent break in a cable. If a sporadic fault does not occur again within 50 warm-up phases (engine start below 50° C coolant temperature. Switched off above 72° C, it will not appear in the fault memory any more. |
| Memorised faults can be read on -V.A.G 1551- or -V.A.G 1552- → Chapter. |
| Erase fault memory after rectifying fault/s → Chapter. |
Note! | General information for self-diagnosis can be found in the instruction manuals for fault readers -V.A.G 1551- and -V.A.G 1552- |
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