Work sequence

Connect V.A.G 1551/1552 (Connecting scan tool and selecting engine electronics control module; see VAG 1551 SCAN TOOL, CONNECTING .)
Run engine at idle speed and press buttons -0- and -1- to select "Engine electronics" address word 01.
Indicated on display

Fig 1: Displaying Rapid Data Transfer Screen
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
Press buttons -0- and -4- to select "Basic setting" and confirm entry with -Q- button.
Indicated on display

Fig 2: Displaying Input Display Group Number Screen
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
Press button -0- three times to select "Display group number 0" and confirm entry with -Q- button.
Indicated on display: (1 - 10 - Display fields)

Fig 3: Displaying Basic System Screen
Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.
Check coolant temperature in display field 7.
- Specification: less than 73 (equates to 85 °C)
Continue with check only when coolant temperature is attained.

The start of injection in display field 2 is dependent on the fuel temperature in display field 9.

Display field 2 start of injection. See Fig 4.
Display field 9 fuel temperature
Specified range for start of injection

Fig 4: Fuel Injection Display Field Graph

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Example:

The numerical value 90 in display field 9 (B) corresponds to a numerical value range of 34 to 73 in display field 2 (A).

NOTE: If the start of injection specifications are within zone -C-, no adjustment is required. After repairs e.g. removing and installing the injection pump or adjusting the timing then the start of injection is to be set to the mean valve (dashed line) of the specification zone -C-.

If the start of injection (timing) is outside the specification tolerances:

Remove connecting pipe between charge air cooler and intake manifold.
See TURBOCHARGER, G-CHARGER - 1.9L 4CYL. 2V TDI - ALH
Remove upper toothed belt guard.
Loosen two injection pump sprocket bolts -1-.
Position 22 mm wrench onto hub nut -2- to counter-hold pump shaft.
Loosen 3rd injection pump sprocket bolt and turn pump shaft slightly:
To left = retards start of injection

To right = advances start of injection

NOTE: DO NOT loosen the hub nut -2-. If nut -2- is loosened the injection pump basic setting will be altered and this cannot be reset with normal workshop equipment.

Fig 5: Identifying Injection Pump Sprocket Bolts And Hub Nut

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Tighten new injection pump sprocket bolts to 20 Nm (15 ft lb).

If the injection pump has not been removed and installed beforehand:

Install new injection pump sprocket bolts in sequence.
Observe figures in field 2 and if necessary adjust again until mean value for specification zone -C- is displayed.
Tighten injection pump sprockets securing bolts a further 1/4 turn (90°).
Press the --> button.
Press buttons -0- and -6- to select "End output" function 06 and confirm entry with -Q- button.
Switch ignition off.
Check DTC memory and, if necessary, repair any malfunctions and then erase; see DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING .
Read readiness code, see READINESS CODE, DISPLAYING .

If the DTC memory has been erased or the engine control module was disconnected from permanent battery positive (B+), the readiness code must be generated again, see READINESS CODE, SETTING .