| Properties of the self-diagnosis |
| The control unit -J220- for the injection and ignition system Motronic is equipped with a fault memory. The fault memory is designed as a permanent memory and as a volatile memory. |
| If malfunctions occur in the monitored sensors or components, they are stored in the fault memory with indication of the fault type ⇒ Fault Table → Chap. 01-2. |
| Faults which occur only occasionally (sporadically), are displayed as “sporadically occurring faults” with the suffix "SP". Possible causes of sporadic faults are e.g. a loose contact or a momentary line interruption. If a sporadic fault no longer occurs within 40 warm-up phases (engine start at a temperature below 50°C - engine stop at more than 72°C), it is removed from the fault memory. |
| The stored faults can be read out with vehicle system tester -VAS 5051-, -V.A.G 1552- or - V.A.G 1551- → Chapter. |
| After the fault(s) has(have) been removed the fault memory must be erased → Chapter. |
| If the engine control unit is disconnected, perform work sequence for voltage interruption → Chap. 24-2. |
| Whenever the fault memory is erased, it is necessary to generate a readiness code → Chap. 01-4. |
Note | t
| The following description only relates to vehicle system tester -VAS 5051- or -V.A.G 1552 -using the program card version 6.0, or higher. |
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| The use of the fault tester -V.A.G 1551 - with integrated printer is similar. A minor deviation on the display read-out is possible. |
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