Volkswagen Workshop Service and Repair Manuals > Passat (B3) > Power unit | Digifant injection and ignition system (4-valve) | Self diagnosis, V.A.G Inspection Service | Self diagnosis | Connecting fault reader V.A.G 1551 and selecting engine electronics control unit

Digifant injection and ignition system (4-valve)

Self diagnosis

Connecting fault reader V.A.G 1551 and selecting engine electronics control unit

Special tools, testers and auxiliary items

Check conditions

Work sequence

‒ → Unclip cover for diagnostic connections.
‒ Connect fault reader with cable V.A.G 1551/3.
‒ Depending upon desired function:
Switch on ignition
or
Start engine , Table "Selectable functions".

Notes:

◆ Additional operating instructions can be called up with the fault reader HELP key.
◆ The ⇒ key serves to advance the programme sequence.

→ Indicated on display:

V.A.G - SELF DIAGNOSIS HELP

1 - Rapid data transfer*

2 - Flash code output*

* Appears alternately

→ Indicated on display:

Rapid data transfer HELP

Input address word XX

→ The fault reader V.A.G 1551 display will show the control unit identification, e.g.:

037906024F DIGIFANT 3.2 1672

Coding

→ Will be indicated on display:

Control unit does not answer! HELP

‒ Print-out a list of possible fault causes by pressing the HELP button.
‒ After eliminating the possible fault causes, again enter address word 01 for "Engine electronics" and confirm input with Q button.

→ Indicated on display:

Rapid data transfer HELP

Select function XX

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