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Interrogating and erasing fault memory > < Technical data of self-diagnosis

A4 Mk1

Simos injection and ignition system (4-cylinder)
Self-diagnosis
Connecting fault reader V.A.G 1551 and selecting engine control unit

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.
 
A24-0028

Test conditions

  • ● Battery voltage at least 11 V
  • ● Earth connections on engine and gearbox OK.
  • ● Fuse OK.
  • ‒ → Open rear ashtray and remove cover for diagnostic connector.
 
A24-0029
  • ‒ → Connect fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3.
 
→ Indicated on display:
V.A.G - SELF-DIAGNOSIS    HELP
    1 - Rapid data transfer
    2 - Flash code output

Note:

If using V.A.G 1551 and test cards with program levels from -D/5.0- onwards the engine control unit can be selected directly via "Rapid data transfer". The self-diagnosis function can be used with program levels from -D/6.0- onwards.

Note:

If the display remains blank:

=> Fault reader operating instructions

Depending on the function required:

  • ‒ Switch ignition on.
  • or
  • Start engine , Table "Selectable functions".
  • ‒ Switch on printer with the Print button
    (Warning lamp in button lights up).
  • ‒ Press key 1 for "Rapid data transfer".
 
→ Indicated on display:
Rapid data transfer    HELP
Enter address word XX

 
→ Press keys 0 and 1 for address word "Engine electronics" and confirm entry by pressing the Q key.
Rapid data transfer    Q
01 - Engine electronics
 
→ If the display shows one of the messages reproduced here, run through the fault-finding procedure as described in the Fault-Finding Programme for diagnosis wiring.
Rapid data transfer    HELP
Control unit does not answer
 
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
Rapid data transfer    HELP
Fault in communication build up
 
Rapid data transfer    HELP
K wire not switching to earth
 
Rapid data transfer    HELP
K wire not switching to positive
 
→ The control unit identification will appear on the display of the V.A.G 1551. For example:
3B0907557A    1.6l R4/2V SIMOS HS D01 ⇒
Coding 00000    WSC XXXXX
  • ◆ 3B0 907 557 A = Part No. of the control unit (see Parts List for latest control unit version)
  • ◆ 1.6 ltr. = engine capacity
  • ◆ R4/2V = engine type (in-line engine, 4-cyl., 2 valves per cylinder)
  • ◆ SIMOS = designation of injection and ignition system
    Si-Mos =SiemensMotorsteuerung (engine management)
  • ◆ HS = manual gearbox (hand shift)
    AT = automatic gearbox
  • ◆ D.. = data level (software version) of control unit
  • ◆ Coding = coding variant of control unit
    => Page 01-61.
  • ◆ WSC = Workshop code

If the coding differs from the vehicle version, then:

  • ‒ Check control unit coding => Page 01-61,
    Coding Simos control unit
  • ‒ Press ⇒key.
 
→ Indicated on display:
Rapid data transfer    HELP
Select function XX

Note:

Press the HELP key to obtain a printout of the functions which are available.

Interrogating and erasing fault memory > < Technical data of self-diagnosis