Work sequence

WARNING: This page is about a different car, the 2002 Volkswagen Cabrio, 2001 Volkswagen Cabrio, and 2000 Volkswagen Cabrio. However, it is still accessible from the selected car via links, so may be relevant.

Remove ashtray and slide cover for Data Link Connector (DLC) to left -arrow-.

Fig 1: Connecting VAG 1551 Scan Tool With Cable VAG 1551/3 To Data Link Connector

Courtesy of VOLKSWAGEN OF AMERICA, INC.

Connect VAG 1551 Scan Tool with cable VAG 1551/3.

After the scan tool has been connected:

Depending upon desired function:
Switch ignition on

or

Start engine. See FUNCTIONS WHICH CAN BE SELECTED WHEN USING THE SCAN TOOLS VAG 1551/1552 OR VAS 5051 , Table "Selectable functions".

NOTE:

If the display remains blank, check voltage supply for diagnostic connection:
See appropriate WIRING DIAGRAM article
If the display does not indicate as described in the work sequence:
See Scan tool operating instructions
If due to an input fault "Error in communication link!" is displayed, disconnect wire from scan tool, reconnect and repeat work step.

Operate scan tool taking into account information on display:

Indicated on display

Fig 2: Scan Tool Display - Rapid Data Transfer/Blink Code Output

Courtesy of VOLKSWAGEN OF AMERICA, INC.

* Appears alternately

Operate scan tool taking into account information on display.
Press key 1 for "Rapid data transfer".
Press keys 0 and 1 for address word "Engine electronics" and confirm entry with Q key.

On the display the control module identification and coding are displayed. For example, see Fig 3.

Fig 3: Scan Tool Display - Example Control Module Coding

Courtesy of VOLKSWAGEN OF AMERICA, INC.

037 906 018 A = Part No. of the control module (for latest control module version see parts catalog)
2.0 ltr. = Engine displacement
R4/2V = Engine configuration (4 - Cyl. in-line engine, 2-valve)
MOTR = System designation (Motronic)
HS = Manual transmission AT = Automatic transmission
V04 = Program level number
Coding xxxxx = Control module coding, coding variants of engine control module. See CODING VARIANTS:
WSC xxxxx = Dealership code from VAG 1551, of the workshop who carried out the last coding. (If the factory coding has not been changed, WSC 00000 appears)

NOTE: Replace control module if the control version displayed does not correspond to the vehicle. See ENGINE CONTROL MODULE (ECM), REPLACING .

An incorrectly coded engine control module leads to:

Engine running problems (gear change jerks, load change jerks, etc.)
Increased fuel consumption
Increased exhaust gas emissions
Malfunctions stored in DTC memory which are not actually present
Functions will not be performed (Oxygen sensor control, activation of the EVAP system, etc.).
Reduced transmission life

If the coding differs from the vehicle version, then:

Checking control module coding. See Engine Control Module (ECM), coding (scan tool function 07)
Press --> key.

Indicated on display:

Fig 4: Scan Tool Display - Rapid Data Transfer

Courtesy of VOLKSWAGEN OF AMERICA, INC.

For further measures see repair procedures.