Volkswagen Workshop Service and Repair Manuals

The Digifant control unit (J169) for the injection and ignition system 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.

The stored faults are output after initiating the fault display .

This fault memory must be erased once the faults have been eliminated => Page 01-5 .

Faults like an intermittent open circuit or loose contact, are stored and displayed as follows:

• ◆ If the faults occur for max. 5 seconds, they will be stored as sporadic faults and as such indicated with the addendum "SP".
• ◆ If the faults occur for longer than 5 seconds, they will be stored as faults and displayed, even though the faults may not be present at that time.

A fault relating to the function of the Lambda control system can only be interrogated after a test drive of at least 5 minutes duration.