| Features of self-diagnosis |
| The 4LV -J537- injection and ignition system control unit 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. |
| After evaluating the information, the engine control unit decides among different fault codes ⇒ Fault table → Chapter bzw. → Chapter and stores them until the contents of the fault memory are erased. |
| Faults which only occur sporadically will have the addendum “sporadic fault” on the print out. These faults will be indicated on the display by the addendum “/SP”. The cause of sporadic faults can be e.g. a loose contact or a brief open circuit. If a sporadic fault does not occur again within 40 warm-up phases (engine start below 50 °C coolant temperature - switched off above 72 °C). |
| The faults stored can be read with the fault reader -V.A.G 1551-, the vehicle system tester -V.A.G 1552- or the new tester -VAS 5051- → Chapter, Fault memory: consulting and clearing. |
| After eliminating the fault(s) , clear the fault memory → Chapter and generate the readiness code again → Chapter. |
Note! | General information for self-diagnosis can be found in the instruction manuals for the fault reader -V.A.G 1551-, vehicle system tester -V.A.G 1552- or the new tester -VAS 5051-. |
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