audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

ABOUT US
List of selectable functions > < Safety precautions

A4 Mk1

Automatic gearbox 01N Self-diagnosis
Performing self-diagnosis
Connecting fault reader V.A.G 1551 (or V.A.G 1552) and selecting functions

Test conditions:

  • ● Selector lever in position "P" and handbrake applied.
  • ● Vehicle voltage supply in order.
  • ● Fuses in order

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

  • ● Earth connections and earthing point for gearbox in order

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

  • ‒ Check earth connections for corrosion and poor contact; repair if necessary.
  • ‒ Check battery earth strap and earth strap between battery and gearbox.
 
A24-0028
  • ‒ Connecting fault reader:
  • ‒ → Open rear ashtray and remove cover for diagnostic connector.
 
A24-0029
  • ‒ → With ignition switched off, connect fault reader V.A.G 1551 using diagnosis cable V.A.G 1551/3.
 
→ Indicated on display:
V.A.G - SELF-DIAGNOSIS    HELP
1 - Rapid data transfer1)
2 - Flash code output1)

    1)    appears alternately

Notes:

  • ◆ Additional operating instructions can be retrieved by pressing the HELP key of V.A.G 1551.
  • ◆ The ⇒ key is used for advancing within the programme sequence.
  • ◆ An automatic check (keys 00) can be carried out in the operating mode 1 "Rapid data transfer". Then all vehicle control units will be interrogated automatically.

=> Fault reader V.A.G 1551 operating instructions.

  • ‒ Switch on ignition.
  • ‒ Switch on printer with the Print key (indicator lamp in key lights up).
  • ‒ Press key 1 for "Rapid data transfer" mode.
 
→ Indicated on display:
Rapid data transfer     HELP
Enter address word XX
  • ‒ Press keys 0 and 2. (Enter the address word "gearbox electronics" with 02.)
 
→ Indicated on display:
Rapid data transfer     Q
02 Gearbox electronics
  • ‒ Confirm entry with key Q.
 
→ Indicated on display:
01N927733CK AG4 Gearbox 01N    2754
Coding 00000    WSC 00000

The control unit identification, the coding and the dealership number of the V.A.G 1551 are displayed:

Control unit identification

Depending upon build level (programme level) the control unit can indicate a different control unit identification, to that shown in the example. Allocation of control unit => Parts catalogue.

  • ◆ 01N 927 733: Part No.
  • ◆ AG4 Gearbox 01N: 4-speed automatic gearbox 01N
  • ◆ 2754: EPROM (Programme level)
  • ◆ Coding 00000: is not required at present.
  • ◆ WSC 00000: V.A.G 1551 dealership number with which the last coding was performed.
 
→ Indicated on display:
Control unit does not answer!    HELP
  • ‒ By pressing the HELP key, a list of possible fault causes is printed out.
  • ‒ After eliminating the possible causes of faults, again enter the address word 02 for "gearbox electronics" and confirm.

If "Control unit does not answer!" again appears:
 
→ Indicated on display:
Control unit does not answer!    HELP

Check control unit voltage supply.

  • ‒ Perform test step 1 , Electrical check.
  • ‒ Check wiring connections to diagnostic sockets

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

  • ‒ => Fault table, page 01-35 under fault code 65535 control unit faulty!
  • ‒ Press ⇒ key.
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX
  • ‒ After the HELP key is pressed, a list of the possible functions is printed out.

List of selectable functions > < Safety precautions