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Check intake manifold temperature sender G72 > < Removing and installing injection pump

Octavia Mk1

Dynamically testing and setting the commencement of injection
Dynamically testing and setting the commencement of injection
  Note
t  Always test and if necessary set the commencement of injection after replacing the toothed belt or after releasing the screws on the injection pump or the toothed belt gears.
t  The dynamic testing of the commencement of injection is only possible in function 04 “Basic setting of engine ” because during this function the injection valve is constantly actuated and thus the injection timing device goes into “late”.
Special tools and workshop equipment required
t  Vehicle system tester -V.A.G 1552- with cable -V.A.G 1551/3, 3A, 3B oder 3C-
t  Counterholder -MP1-216 (3036)-
t  Centering mandrel -3359-
Test sequence
–  Connect vehicle system tester -V.A.G 1552- and activate → Chapter the function “Initiate basic setting”.
   
–  Observe display in display field 7 (coolant temperature)
Specified value: less than 73 (corresponds to 85°C)
Only proceed with test once the coolant temperature has been reached.
For vehicles ? 07.00
–  The commencement of injection in display field 2 is dependent on the fuel temperature in display field 9.
  
Initiate basic setting 0              ->
1   2   3   4    5    6   7   8   9   10
Nominal value ⇒ figure - range C
A - Display field 2, commencement of injection
B - Display field 9, fuel temperature
C - Nominal value for commenecement of injection
For vehicles 08.00 ?
–  The commencement of injection in display field 2 is dependent on the fuel temperature in display field 9.
  S23-0061
Nominal value ⇒ figure - range C
A - Display field 2, commencement of injection
B - Display field 9, fuel temperature
C - Nominal value for commenecement of injection
For all vehicles
  Note
No setting is required if during testing the commencement of injection is in the nominal value range -C-. The commencement of injection must be set to the middle value after replacing the injection pump and the engine control unit.
If the commencement of injection is outside the nominal range, set the injection pump in accordance with the figure:
–  Switch off ignition.
–  Remove engine cover.
–  Remove top toothed belt guard.
–  Test toothed belt voltage.
The markings on the tensioning pulley must be opposite one another.
If markings are not positioned opposite:
–  Adjusting toothed belt tension → 1.9 ltr./50 kW (TDI) Engine, Mechanics → Rep. Gr.13.
  N23-0318
–  Slacken two fixing screws -1- of injection pump gear (counterhold with rig pin -3359-).
–  Position a ring spanner on the hub nut -2- to hold the pump shaft.
–  Release the third fixing screw of the injection pump gear and slightly rotate the pump shaft:
Rotate the shaft to the left
⇒ Commencement of injection later
Rotate the shaft to the right
⇒ Commencement of injection earlier
  Note
The nut -2- of the hub must never be loosened. This could result in a misadjustment of the basic setting of the injection pump which cannot be corrected with workshop tools.
–  Tighten the new fixing screws for the injection pump gear to 20 Nm and then torque a further 1/4 turn (90°) (counterhold with rig pin -3359-).
  Note
The fixing bolts must be used once only as they are antifatigue bolts.
–  Install top toothed belt guard.
–  Install the engine cover.
–  Once again check the commencement of injection for nominal value.
If the commencement of injection is outside the nominal range:
–  Coorect the setting at injection pump gear.
If the commencement of injection cannot be set in the nominal range:
–  Test spray pressure of the pump → Chapter.
If the injection pump in order:
–  Replace engine control unit → Chapter.
  A23-0044

Check intake manifold temperature sender G72 > < Removing and installing injection pump