volkswagen Workshop Repair Guides

Volkswagen Workshop Service and Repair Manuals

Interrogating fault memory > < Technical data of self diagnosis
Mono Motronic injection and ignition system
Self diagnosis
Connecting fault reader V.A.G 1551 and selecting engine electronics control unit

Special tools, testers and auxiliary items

Vehicles ▸ 07.93

  • ◆ Fault reader V.A.G 1551 with cable V.A.G 1551/1

Vehicles 08.93▸

  • ◆ Fault reader V.A.G 1551 with cable V.A.G 1551/3

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.

Check conditions

  • ● Fuse 21 OK.
  • ● Battery voltage at least 11 V
  • ● Earth connections on front of clutch housing/on cylinder head OK.

Work sequence

Vehicles ▸07.93

 
V29-0064
  • ‒ → Unclip covers for diagnostic connections below the heating/ventilation controls.
  • ‒ Connect fault reader (or vehicle system tester) with cable V.A.G 1551/1 as follows:
  • ‒ First connect black plug for the fault reader voltage supply to black diagnostic socket.
  • ‒ Connect white plug to white diagnostic socket. (The blue plug is not required.)

Vehicles 08.93 ▸

 
N29-0003
  • ‒ → Open ashtray, remove if necessary and slide cover for diagnostic connections to left -arrow-.
  • ‒ Connect fault reader (or vehicle system tester) with cable V.A.G 1551/3.

After the fault reader has been connected:

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

Notes:

  • ◆ 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:
  • ‒ Input 1 for "Rapid data transfer".
  • ‒ Input 01 for address word "Engine electronics" and confirm with Q.
 
→ The fault reader V.A.G 1551 display will show the control unit identification, e.g.:
032906026B 1.6l     R4 MONO     1.3     D35     ⇒
Coding 00
  • ◆ 032 906 026B = Part No. of the control unit
  • ◆ 1.6 ltr. = Engine capacity
  • ◆ R4 = Type of engine (4 Cyl. in-line engine)
  • ◆ MONO 1.3 = System designation and version
  • ◆ D35 = Programme level number
  • ◆ Coding 00 = Coding variants
  • ‒ Press ⇒ key.
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX
  • ‒ Further measures see repair procedures.

Interrogating fault memory > < Technical data of self diagnosis