Audi Workshop Service and Repair Manuals

Notes:

• ◆ The injection start must always be checked after renewing the toothed belt or loosening the injection pump bolts or toothed belt sprockets and adjusted if necessary.
• ◆ The dynamic checking and correction of the commencement of injection is only possible in function 04 "Basic Engine Setting". This is because in function 04 the commencement of injection valve is activated continuously and therefore the injection timing control is set to "retarded".

• ‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and select the engine electronics control unit using "Address word" 01. When doing this the engine must be running at idling speed.
  (Connecting fault reader and selecting engine electronics control unit .)

• ‒ Press keys 0 and 4 for the function "Introduction of basic setting" and confirm entry with Q key.

• ‒ Press key 0 three times for "Display group number 0" and confirm entry with the Q key.

• ‒ Observe the display in display zone 7 (coolant temperature).

• Specified value: less than 73 (corresponding to 85 °C)

Do not continue with the test until the coolant has reached the specified temperature.

• ‒ → The commencement of injection in display zone 2 depends on the fuel temperature value in display zone 9.

• Specified value: => Range C in illustration
• A - Display zone 2 Commencement of injection
• B - Display zone 9 Fuel temperature

Notes:

• ◆ If the commencement of injection is advanced, turn the injection pump in the engine's direction of rotation, if the commencement of injection is retarded, turn against the direction of rotation.
• ◆ If injection start is within specified range C when tested, no adjustment is required. After repairs, such as the removal and installation of the injection pump, the adjustment of the timing, the commencement of injection should be set to the mean valve (dashed line) in specified range -C-.

If the commencement of injection (timing) is outside the specification tolerances, adjust the commencement of injection as follows:

Adjust the commencement of injection

• ‒ Remove the upper toothed belt guard, if this has not already been done.
• ‒ Loosen the injection pump securing bolts by approx. one turn, leaving the easiest bolt to reach till last.
• ‒ By hand, hold the injection pump under tension in the direction to be adjusted.

• ‒ Carefully loosen the last securing bolt until the pump can be turned slightly and then retighten the securing bolt.
• ‒ Check the setting in the function "Basic Setting 04".

• ‒ Observe the value in display zone 2 and, if necessary, repeat adjustment until the value displayed remains at the mean value for the specified range -C- => Page 23-23.
• ‒ Tighten the injection pump securing bolts to 25 Nm.
• ‒ Check the commencement of injection again.

Note:

After a dynamic adjustment of the injection pump, the injection lines on the injection pump must always be loosened and then tightened again (25 Nm). This relieves the strain on the pipes and prevents vibration fractures.