Volkswagen Workshop Service and Repair Manuals

Special tools, testers and auxiliary items

• ◆ Fault reader V.A.G 1551 with cable V.A.G 1551/3

Note:

The vehicle system tester V.A.G 1552 can be used instead of the fault reader V.A.G 1551, however a print-out is not possible.

Test conditions

• ● Fuse 22 OK.
• ● Battery voltage at least 11 V
• ● Earth connections on engine and gearbox OK.
  (Earth connection engine: , Item 17 ).

Work sequence

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

Notes:

• ◆ If the display does not indicate as described in the work sequence:

=> Fault reader operating instructions

• ◆ If due to an input fault "Fault in the data transfer!" is displayed, pull wire off fault reader, reconnect and repeat work step.

• ‒ Operate fault reader taking into account the information on the display:
• ‒ Press key 1 for "Rapid data transfer".
• ‒ Press keys 0 and 1 for address word "Engine electronics" and confirm entry with Q key.

Engine codes ADY and AGG

• ◆ 037 906 025 = Part No. of the control unit (for latest control unit version see parts catalogue)
• ◆ SIMOS 4S = System designation and version
• ◆ 1806 = Programme level number
• ◆ Coding 00000 = Coding variants
• ◆ WSC = Workshop code

Engine code AFT

• ◆ 037 906 025 K = Part No. of the control unit (for latest control unit version see parts catalogue)
• ◆ SIMOS 4S2 = System designation (4S) and
  version (2)
• ◆ 2025 = Programme level number
• ◆ Coding 00000 = Coding variants
• ◆ WSC = Workshop code

Continued for all engine codes

If the coding differs from the vehicle version, then:

• ‒ Check control unit coding => Page 01-7 ,
  Coding Simos control unit
• ‒ Press ⇒key.

• ‒ Further measures see repair procedures.