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Connecting vehicle diagnostic, testing and information system VAS 5051 and selecting engine electronics control units > < Significance of EPC warning lamp (fault lamp for electronic accelerator) in dash panel insert
MM-MPI injection and ignition system (4-cylinder)
General notes onself-diagnosis
Significance of exhaust emissions warning lamp

If the engine control unit detects a fault this is indicated by switching the exhaust emissions warning lamp on.

 
A24-0380

→ Location of exhaust emissions warning lamp

Note:

The exhaust emissions warning lamp can switch on in the continuous or flashing mode. Always interrogate fault memory .

  • ◆ Flashing mode: There is a faultpresent which can damage the catalytic converter if the vehicle is driven further in this condition (with the same throttle opening). If this occurs, continue driving only at reduced power.
  • ◆ Continuous mode: There is a fault present which causes the emissions to deteriorate. Interrogate engine or gearbox control unit in this case.
  • ◆ Interrogate the fault memory if the engine doesnot run properly or if the customer has reported a problem and the exhaust gas warning lamp does notlight up. This is because faults can be stored which will not switch the exhaust gas warning lamp on immediately.

Functional check:

  • ‒ Switch on ignition:
        the exhaust emissions warning lamp must light-up.

If the exhaust emissions warning lamp does not light-up with ignition switched on:

If the exhaust emissions warning lamp lights-up with ignition switched on, continue check as follows:

  • ‒ Start engine and run at idling speed:
        The exhaust emissions warning lamp must go out after
        a few seconds.

If the exhaust emissions warning lamp does not go out:

  • ‒ Interrogate fault memory, if necessary, repair any faults and then erase fault memory => Page 01-19, interrogating and erasing fault memory.

Connecting vehicle diagnostic, testing and information system VAS 5051 and selecting engine electronics control units > < Significance of EPC warning lamp (fault lamp for electronic accelerator) in dash panel insert