Volkswagen Workshop Service and Repair Manuals

Special tools, testers, measuring instruments and auxiliary items required

• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
• ◆ Ring spanner 3035
• ◆ Torque wrench V.A.G 1331 (5...50 Nm)

Notes:

• ◆ Dynamically checking and correcting commencement of injection is only possible in function 04 "Engine basic setting".
• ◆ The commencement of injection must always be checked after renewing the toothed belt or loosening the injection pump bolts or toothed belt sprockets and if necessary adjusted.

Checking and adjustment conditions

• ● Mechanical engine basic setting OK.
• ● Toothed belt tension OK.

• ‒ Connect fault reader V.A.G 1551 and select engine electronics control unit (address word 01); carry out selection with engine idling.
  

• ‒ Input 04 for "Introduction of basic setting" and confirm with Q.

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

• ‒ → The commencement of injection in display zone 2 is dependent upon fuel temperature display zone 9.
       Specification: =>Fig. zone C

• A - Zone 2 commencement of injection
• B - Zone 9 fuel temperature

Notes:

• ◆ 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.
• ◆ 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 valve (dashed line) of specification zone -C-.

• ‒ Loosen injection pump securing bolts approx. one turn leaving the easiest bolt to reach till last.
• ‒ Hold injection pump by hand under tension in the direction to be adjusted. Carefully loosen last securing bolt until the pump can be turned slightly and then retighten securing bolt.
• ‒ Observe figures in zone 2 and if necessary adjust again until the mean valve for specification zone -C- are displayed.
• ‒ Tighten injection pump securing bolts (25 Nm).
• ‒ Again check commencement of injection is as specified.
• ‒ Press ⇒ key.
• ‒ Input 06 for "End output" and confirm with Q.

Note:

Loosen and re-tighten (25 Nm) the injection pipes on the injection pump after dynamically adjusting the injection pump. This relieves the strain on pipes and prevents vibration breakages.