Start of injection, dynamically checking and adjusting: Checking

WARNING: This page is about a different car, the 1999 Volkswagen Jetta, 1998 Volkswagen Jetta, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

Connect VAG1551 or VAG1552 scan tool, see VAG1551 SCAN TOOL (ST), CONNECTING .
Start engine and let idle.
Press buttons -0- and -1- to insert the "Engine Electronics" address word 01.

Indicated on display

Fig 1: Scan Tool Display - Checking Injection (1 Of 3)

Press buttons -0- and -4- to select "Basic Setting" function 04.
Press -Q- button to confirm input.

Indicated on display

Fig 2: Scan Tool Display - Checking Injection (2 Of 3)

Press -0- button three times to input display group no. 0 (000).
Press -Q- button to confirm input.

Indicated on display (1 - 10 display fields)

Fig 3: Scan Tool Display - Checking Injection (3 Of 3)

NOTE: The start of injection value in display field 2 varies depending on the fuel temperature value in display field 9.

- Display field 2-Start of injection value. See Fig 4 .
- Display field 9-Fuel temperature value
- Specified range for start of injection
(depending on fuel temperature)

Fig 4: Start Of Injection Values Graph

Example:

The fuel temperature value "B" in display field 9 (e.g. 90) corresponds to the start of injection value "A" in display field 2, which should fall within the range "C" between 34 and 73.

NOTE:

If, when checking the start of injection, the results fall within zone -C-, no adjustment is required.
After repairs (for example: removing and installing Diesel injection pump), set the start of injection to the mean value (dashed line) of the specified zone -C-.
If the start of injection is too far advanced, adjust by turning the injection pump in the direction of engine rotation.
If start of injection is too far retarded, adjust by turning the injection pump against the direction of engine rotation.

Loosen Diesel injection pump mounting bolts approx. 1 turn, but leave easiest-to-reach bolt until last.
Hold injection pump under tension by hand, in direction to be adjusted.
Carefully loosen last mounting bolt until injection pump can just be turned slightly, then re-tighten last mounting bolt.
Check values in scan tool display field 2; if necessary adjust again until display equals mean value for specified range -C-.
Tighten injection pump mounting bolts.
Tightening torque: 25 Nm (18 ft lb)
Check start of injection again.
Press --> button.
Press buttons -0- and -6- to select "End Output" function 06.
Press -Q- button to confirm input.

NOTE: Loosen and re -tighten the injector lines on the injection pump (25 Nm, 18 ft lb) after it has been dynamically adjusted. This relieves any line strain and prevents damage due to vibration.

Check and erase DTC memory, see ERASE DTC MEMORY (SCAN TOOL FUNCTION 05) .
Re-create readiness code, see READINESS CODE, SETTING (UP TO M.Y. 1997) .