Audi Workshop Service and Repair Manuals

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.

All functions of V.A.G 1551/1552 can also be carried out with the new tester V.A.S 5051. Connecting VAS 5051 .

• ◆ → V.A.G 1551/3 Cable

Test conditions

• ● The fuses must be OK.
• ● Earth connection between engine (on gearbox bell housing) and body (below battery) OK.
• ● The battery voltage must be at least 11.5 V.
• ● If the vehicle is equipped with an air conditioning system, this must be switched off.
• ● All electrical consumers, e.g. lights and rear window heating must be switched off.

Work sequence

• ‒ Connect fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3 (illustration shows VAS 5051/1).
• ‒ Depending on the desired function either switch ignition on
      or
  start engine and run at idling speed. 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.

* 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.

• ◆ 030906032E = Part No. of control unit (for up-to-date control unit version see parts film)
• ◆ ME 7.5.10 = System designation and version
• ◆ YYYY = Programme level number
• ◆ Coding 00001 = Control unit coding, coding variants of engine control unit => Page 24-139.

• ◆ WSC xxxxx = Workshop code from V.A.G 1551, of the workshop which carried out the last coding. (If the factory coding has not been changed, WSC 00000 appears)

If the coding differs from the vehicle version:

• ‒ Check control unit coding and, if necessary, code engine control unit => Page 24-136

An incorrectly coded engine control unit leads to:

• ◆ Engine running faults (gear change jerks, load change jerks, etc.)
• ◆ Increased fuel consumption
• ◆ Increased exhaust gas emissions
• ◆ Faults stored in fault memory which are not actually present
• ◆ Functions will not be performed (Lambda regulation, activation of the activated charcoal filter system, etc.).
• ◆ Reduced gearbox life

• ‒ Press ⇒key.

• ‒ Further measures see repair procedures.