Start of Injection, Dynamic Checking
NOTES:
- Dynamically checking and adjusting Start of injection is only possible in Function 04 "Engine basic setting".
- Start of injection must always be checked after replacing the toothed belt or loosening the injection pump bolts or toothed belt sprockets and adjusted if necessary.
Special tools, workshop equipment, testers, measuring instruments and auxiliary items required
- VAG 1551/1552 Scan Tool using VAG 1551/3 adaptor cable
- VAG 1331 Torque wrench (5 to 50 Nm) (3.7 to 37 ft lb)
checking and adjustment requirements
- Mechanical engine settings OK.
- Toothed belt tension OK.
Work Sequence
- Connect VAG 1551/1552 Scan Tool. Testing and Inspection
- Ensure that engine is running at idle
- Press 0 and 1 buttons to select Address word 01: "Engine electronics"
Display will appear as shown
Rapid data transfer HELP
Select function xx
- Press 0 and 4 buttons to select Function 04: "Basic setting"
- Press Q button to enter input
Display will appear as shown
Basic setting HELP
Input display group number xxx
- Press 0 button three times to select "Display group 0"
- Press Q button to enter input
Display will appear as shown (1 to 10 = Display zones)
System in basic setting 0 ->
1 2 3 4 5 6 7 8 9 10
- Check Engine Coolant Temperature in display zone 4.
- Specification: smaller than 73 (corresponds to 85 °C)
NOTES:
- Continue with check only when specification is obtained.
- The start of injection in display zone 2 is dependent on the fuel temperature in display zone 9.
- A - Display zone 2: Start of injection
- B - Display zone 9: Fuel temperature
- C - Specified range for: Start of injection
Example:
The numerical value 90 in display zone 9 (B) corresponds to a numerical value range of 34 to 73 in display zone 2 (A).
NOTE: If the start of injection specifications are within zone-C-, no adjustment is required. After repairs e.g. removing and installing Diesel injection pump, adjust the timing then set the start of injection to the mean value (dashed line) of specification zone -C-.
If the Start of injection is outside of the required range
- Begin Start of injection sequence again.
- Remove upper toothed belt guard.
- Loosen mounting bolts (two) -1- on injection pump gear.
To hold pump shaft securely
- Place offset tubing wrench SW 22 on nut -2-.
- Loosen third fastening nut on injection pump gear and turn pump shaft carefully
- left around = Injection starts earlier
- right around = Injection starts later
NOTE: Nut -2- for the hub should not be loosened under any circumstances. The basic adjustment of the injection pump is other- wise offset and and can not be adjusted with workshop tools.
- Tighten the new mounting bolts for the injection pump gear
- 20 Nm (15 ft lb)
If injection pump can NOT be removed/installed beforehand:
- Install the new mounting bolts for the injection pump gear in sequence.
- Observe values in zone 2 and if necessary, adjust again until mean value for specification zone -C-is displayed.
- Re-tighten the mounting bolts for the injection pump gear 1/4 turn (90 °C) .
- Press -> button.
- Press 0 and 6 buttons to select Function 06:" End transfer"
- Press Q button to enter input