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Connecting vehicle diagnosis, testing and information system VAS 5051 and selecting engine electronics control unit > < Technical data of self-diagnosis

Polo Mk3

4AV injection and ignition system
General to self-diagnosis
Connecting fault reader V.A.G 1551 and selecting engine electronics control unit
 
W00-0459

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

  • ◆ → V.A.G 1551 Fault reader

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.
 
W00-0047
  • ◆ → V.A.G 1551/3 Cable

Test conditions
 
N01-0220
  • ● → The fuses 1, 2, 3, 4, 9,10 and 32 must be OK.
  • ● The battery voltage must be at least 11.5 V.
  • ● Earth connection between engine (on gearbox bell housing) and body (below battery) OK.
  • ● Earth connection in plenum chamber OK.

Work sequence
 
N01-0221
  • ‒ → Pull off cover in stowage compartment left below the steering wheel.
  • ‒ Connect fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3.

After the fault reader has been connected:

  • ‒ Depending upon desired function:
    Switch ignition on
         or
    Start engine , Table "Selectable functions".

Notes:

  • ◆ If the display remains blank, check voltage supply for diagnostic connection according to fault finding programme:

=> Current flow diagrams, Electrical fault finding and Fitting locations

  • ◆ 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:
 
→ Indicated on display:
V.A.G - SELF DIAGNOSIS     HELP
     1 - Rapid data transfer*
     2 - Flash code output*

* Appears alternately

  • ‒ 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.
 
→ The control unit identification and the coding will appear on the display, e.g.:
036 906 041M     MARELLI 4AV     2271 ⇒
Coding 00000     WSC XXXXX
  • ◆ 036 906 014M = Part No. of the control unit (for latest control unit version see parts catalogue)
  • ◆ MARELLI 4AV = System designation and version
  • ◆ 2271 = Programme level number
  • ◆ Coding 00000 = Control unit coding
  • ◆ WSC xxxxx = Workshop code from V.A.G 1551, of the workshops who carried out the last coding. (If the factory coding has not been changed, WSC 00000 appears)

Note:

Replace control unit if the control version displayed does not correspond to the vehicle

=> Page 24-102 .

  • ‒ Press ⇒key.
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX
  • ‒ Further measures see repair procedures.

Connecting vehicle diagnosis, testing and information system VAS 5051 and selecting engine electronics control unit > < Technical data of self-diagnosis