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

A4 Mk1

Motronic Fuel Injection and ignition system (4-cyl.) 07.96ä
Self-diagnosis
Connecting fault reader V.A.G 1551 and selecting engine electronics control unit
 
A24-0028

Test conditions

  • ● Battery voltage at least 11 V
  • ● 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 using cable V.A.G 1551/3.
 
→ Indicated on display:
V.A.G - SELF-DIAGNOSIS    HELP
    1 - Rapid data transfer *
    2 - Flash code output*

* Appears alternately

Note:

If the display remains blank:

=> Fault reader operating instructions

Depending on the function required:

  • ‒ Switch on ignition
  • or
  • Start engine , "Selectable functions" table.
  • ‒ Switch on printer with the print switch
    (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 shown, run through the fault finding procedure as described in the diagnosis management Fault Finding Programme.
Rapid data transfer      HELP
Control unit does not answer
 
=> "Current Flow Diagrams, Electrical Fault Finding and Fitting Locations" binder
Rapid data transfer      HELP
Communication problem
 
Rapid data transfer      HELP
K wire not switching to earth
 
Rapid data transfer      HELP
K wire not switching to positive
 
→ The display on fault reader V.A.G 1551 will show the control unit identification code e.g.:
8D0907557.. 1.8L    R4/5V    MOTR AT D..    ⇒
Coding 04031    WSC 12345

- 8D0907557..

Control unit number (see also spare parts programme)

- 1.8l

Engine capacity

- R4/5V

In line engine, 4 cylinders, 5 valves

- MOTR

Motronic

- HS
- AT

Manual gearbox
Automatic gearbox

- D..

Data status (software version) of control unit

- Coding 04031

Coding of control unit

- WSC 12345

Workshop Code from V.A.G 1551 used to perform the last encoding
  • ‒ Press the ⇒key.
 
→ Indicated on display:
Rapid data transfer      HELP
Select function XX

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