Connecting vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and selecting functions — AUDI

Test requirements:

Supply voltage of vehicle electrical system OK
Fuses for engine electronics OK

=> "Current Flow Diagrams, Electrical Fault-finding and Fitting Locations" binder

Fuel pump relay OK; checking =>Page
25-17
.
Earth connections checked.

Test following earth connections for corrosion and poor connection before interrogating fault memory, final control diagnosis, engine basic settings, test of wiring and also before replacing components:

Earth attachment point at left of intake manifold -arrow-.

Battery earth strap and earth strap between engine and longitudinal member -arrows- (shown from vehicle underside).

Repair any damaged earth connections.

Remove cover from additional relay carrier I on left of plenum chamber.

Connect the vehicle diagnosis, testing and information system VAS 5051 using diagnostic cable VAS 5051/1 and diagnosis adapter VAS 5051/2. Alternatively, connect fault reader V.A.G 1551 using diagnostic cable V.A.G 1551/1.

Attention!
Pay attention to the safety precautions => Page
01-1
.
Note:

The following describes self-diagnosis using the fault reader V.A.G 1551 only.

When using the vehicle diagnosis, measurement and information system VAS 5051, follow the procedures described in equipment's operating instructions.

Make sure that ignition is switched off, then connect black connector to black diagnostic connection.

V.A.G SELF DIAGNOSIS
HELP
1 - Rapid data transfer 1)
2 - Flash code output 1)
Display:

1)
appears alternately

Note:

If the display remains blank, test voltage supply to black diagnostic connector => Page
01-55
.

Connect white connector to white diagnostic connection (blue connector not required).

Depending upon the desired function => Table "Available Functions", Page
01-8
:

Switch the ignition on.

or

Start the engine.

Switch on the fault reader printer with the print key. The indicator lamp in the key must light up.
Press key 1 for "Rapid data transfer".

Rapid data transfer
HELP
Enter address word XX
When adjacent display appears:

Note:

Address word 00 is used to start the automatic test sequence i.e. interrogation of fault memories in all vehicle systems with self-diagnosis capability in vehicle with rapid data transfer.

Press keys 0 and 1 for address word "Engine electronics" and confirm entry with Q key.

4A0907404B 2.0 l R4 MK 4Valve D00
⇒
Code 00
The fault reader V.A.G 1551 display will show the control unit identification. For example:

Note:

The control unit identification can be printed out by pressing the PRINT key on fault reader V.A.G 1551.

Control unit identification (example)

- 4A0 907.404 B · Part No.; assignment / => Parts List
- 2.0l · Engine capacity
- R4 · Type of engine (4 cyl. in-line engine)
- MK · Injection and ignition system
- 4 valve · 4-valve
- D00 · Control unit data status (software type)
- Code 00 · Coding of control unit=>Page 01-42

Press ⇒key.

Rapid data transfer
HELP
Select function XX
Display readout (function selection):

Notes:

After entering the function "01" for "Interrogating control unit version" and confirming with the Q key, you may display the control unit identification again.
Rapid data transfer
HELP
Control unit does not answer.
When adjacent display appears:

Print out possible cause of trouble by pressing HELP key.

Rapid data transfer
HELP
L wire not switching to earth
Check white diagnostic connector wiring => Page
01-56
.
Rapid data transfer
HELP
L wire not switching to positive
Vehicles with KE Motronic self-diagnosis only: Check the earth connections to the engine control unit => Page
28-29
.

Rapid data transfer
HELP
K wire not switching to earth

Rapid data transfer
HELP
K wire not switched to positive

Rapid data transfer
⇒
Communication problem
If this display appears when starting or during the program, faults have occurred and data exchange between fault reader V.A.G 1551 and the engine control unit is no longer possible.

After rectifying the faults, enter "01" again for address word "Engine electronics" => Page
01-2
.

Available functions

Connecting vehicle diagnosis, measurement and information system VAS 5051 or fault reader V.A.G 1551 · Ignition on, / engine stopped · Engine idling · Vehicle running · Page
Address words
01 · Engine electronics · yes · yes · yes · 01-2
00 · Automatic test sequence · yes · yes · yes · 01-5
Functions
01 · Check control unit version · yes · yes · yes · 01-2
02 · Interrogate fault memory · yes · yes · yes · 01-9
03 · Final control diagnosis · yes · no · no · 01-34
04 · Basic setting · no · yes · no · 01-39
05 · Erase fault memory · yes · yes · yes · 01-9
06 · End of output · yes · yes · yes · 01-12
08 · Reading measured value block · yes · yes · yes · 01-45