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Removing and installing injectors > < Dynamically checking and adjusting commencement of injection

Leon Mk2

Work sequence
Work sequence
–  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 key 0 three times for “Display group number 0” and confirm entry with Q key.
  
Basic setting                       HELP
Input display group number XXX
Indicated on display: (1...10 = Display zones)
–  Check coolant temperature in display zone 7. Specification: less than 73 (equates to 85 °C)
Continue with check only when coolant temperature is attained.
The commencement of injection in display zone 2 is dependent on the fuel temperature in display zone 9.
  
System in basic setting 0              →
  1   2   3   4   5   6   7   8   9   10
A - Display zone 2 commencement of injection B - Display zone 9 fuel temperature C - Specified range for commencement of injection
Example:
The numerical value 90 in display zone 9 B corresponds to a numerical value range of 40...79 in display zone 2 A.
  Note!
t  If the commencement of injection is advanced turn injection pump in engine direction of rotation, if the commencement of injection is retarded turn against direction of rotation.
t  If when checking the commencement of injection the specifications are within zone -C- then no adjustment is required. After repairs e.g. removing and installing injection pump, adjusting timing then the commencement of injection is to be set to the mean value (dashed line) of specification zone -C-.
If the commencement of injection (timing) is outside the specification tolerances, adjust commencement of injection as follows:
–  Remove upper toothed belt guard.
–  Loosen injection pump securing nuts/bolts approx. one turn, leaving the easiest to reach nut/bolt till last.
–  Hold injection pump by hand under tension in direction to be adjusted.
–  Carefully loosen last securing nut/bolt until the pump can be turned slightly and then retighten securing nut/bolt.
  N23-0196
–  Observe figures in zone 2 and if necessary adjust again until the mean value for specification zone -C- is displayed.
–  Tighten injection pump securing nuts/bolts to 25 Nm.
–  Check commencement of injection again.
–  Press the → key.
  N23-0196
Indicated on display:
–  Press keys 0 and 6 for the function “End output” and confirm entry with the Q key.
  
Rapid data transfer                 HELP
Select function XX
Indicated on display:
–  Switch off ignition.
  Note!
t  After dynamically adjusting the injection pump, always loosen injector pipes on injection pump and retighten (25 Nm). This relieves stress on pipes and prevents fatigue fractures.
t  Use spanner -U-40072- to loosen and tighten injector pipes.
–  Install upper toothed belt guard.
  
Rapid data transfer                 HELP
Enter address word XX

Removing and installing injectors > < Dynamically checking and adjusting commencement of injection