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List of selectable functions > < Performing self-diagnosis

Golf Mk4

Automatic gearbox 01M self-diagnosis
Performing self-diagnosis
Connecting fault reader V.A.G 1551 and selecting functions

Safety precautions

Observe following if test and measuring instruments are required during a test drive:

  • ◆ Test and measuring instruments must be secured to rear seat and operated by a 2nd person from this location.
  • If test and measuring instruments are operated from front passenger's seat and the vehicle is involved in an accident, there is a possibility that the person sitting in this seat may receive serious injuries when the airbag is triggered.

Test conditions:

  • ● Vehicle voltage supply in order.
  • ● Fuses No. 07, 11, 15 and 31 in order.
  • ● Fuse in main fuse box (110 amps.) in order.
  • ● Earth connections for gearbox in order.
  • ● Selector lever in position "P" and handbrake applied.
  • ‒ Check earth connections for corrosion and poor contact; repair if necessary.

Earth connecting points are located in plenum chamber and below the battery in engine compartment.
 
N01-0107
  • ‒ Check battery earth strap and earth strap between battery and gearbox.
  • ‒ → Remove diagnostic connection cover -1- .
  • ‒ With ignition switched off, connect fault reader V.A.G 1551 with diagnosis cable V.A.G 1551/3A.
 
→ Indicated on display:
V.A.G - SELF-DIAGNOSIS     HELP
1 - Rapid data transfer1)
2 - Flash code output1)

     1)     appears alternately

  • ◆ Additional operating instructions can be called up 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.

Example:
 
→ Indicated on display:
01M927733BB     AG4 Gearbox 01M     2029
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.

  • ◆ 01M 927 733 BB: Part No.
  • ◆ AG4 Gearbox 01M: 4-speed automatic gearbox 01M
  • ◆ 2029: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" binder, Golf 1998ä.

  • ‒ => Fault table, page 01-36 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 > < Performing self-diagnosis