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Checking commencement of injection valve N108 > < Checking injection timing control range

Leon Mk2

Test sequence
Test sequence
Checking the range of the injection timing control is undertaken in function 04 (Basic settings). Using this procedure the commencement of injection valve is pulsed so that the extremity values for advanced (early) and retarded (late) positions for the timing device can be read in measured value block 004, display zone 3.
–  Connect fault reader -V.A.G 1551- (-V.A.G 1552-) and select engine electronics control unit with the “Address word” 01. When doing this the engine must be running at idling speed. (Connecting fault reader and selecting engine electronics control unit → Vehicle diagnosis, testing and information system VAS 5051.)
   
Indicated on display:
–  Press keys 0 and 4 for the function “Introduction of basic setting” and confirm entry with Q key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on display:
–  Press keys 0, 0 and 4 for “Display group number 4” and confirm entry with Q key.
  
Basic setting                       HELP
Input display group number XXX
Indicated on display:
Specification in display zone 3: 6.5...9.5° BTDC
After approx. 10 seconds the timing device is moved to the retarded (late) position.
  
System in basic setting 4              →
880 rpm    early     7.9 ° BTDC     66 %
Indicated on display:
Specification in display zone 3: 2.5...5.5° BTDC
–  If specification is not attained, check commencement of injection valve as described in the following:
–  Press the → key.
–  Press keys 0 and 6 for the function “End output” and confirm entry with the Q key.
–  Switch off ignition.
  
System in basic setting 4              →
880 rpm     late     3.9 ° BTDC     74 %

Checking commencement of injection valve N108 > < Checking injection timing control range