Connecting up fault reader V.A.G 1551 and selecting engine electronics control unit — AUDI

Test requirements

Fuses for engine electronics OK
Fuel pump relay OK
Battery voltage at least 11 V
Earth connections at engine and gearbox OK

Switch off ignition.
Connect vehicle diagnostic, testing and information system VAS 5051 with diagnostic lead VAS 5051/1. Alternatively, use can be made of diagnostic wire V.A.G 1551/3 to connect up fault reader V.A.G 1551.

Note:

Diagnostic connection is located in front left knee restraint.

Attention:
On test drives the vehicle diagnostic, testing and information system VAS 5051 or the fault reader V.A.G 1551 must only be secured on the rear seat and operated from there.
Observe the safety precautions => Page
24-1

Note:

The following description refers solely to implementation of self-diagnosis using fault reader V.A.G 1551.

Proceed in line with equipment operating instructions if use is made of vehicle diagnostic, testing and information system VAS 5051.

V.A.G SELF-DIAGNOSIS
HELP
1 - Rapid data transfer 1)
2 - Flash code output1)
Indicated on display:

1)
Displayed alternately

If display remains blank, check diagnostic wiring:

=> "Current Flow Diagrams, Electrical Fault-finding and Fitting Locations" binder; "Diagnostic Wire" fault-finding program

Depending on desired function => "Available functions" table, Page
01-2
:

Switch on ignition.

or

Start engine.
Switch on printer of fault reader by pressing Print key. Lamp in key must light.
Press key 1 for "Rapid data transfer".

Rapid data transfer
HELP
Enter address word XX
Indicated on display:

Rapid data transfer
Q
01 - Engine electronics
Press keys 0 and 1 for address word "Engine electronics" and confirm entry with Q key.

Note:

Rapid data transfer
HELP
No control unit response
If one of the adjacent messages appears on the display, perform fault-finding in line with fault-finding program for diagnostic wire.

=>
Rapid data transfer
HELP
Fault in communication link
Current Flow Diagrams, Electrical Fault-finding and Fitting Locations binder

Rapid data transfer
HELP
K-wire not switched to earth

Rapid data transfer
HELP
K-wire not switched to positive

8D1906018.. 1.8l
R4S/5V MOTR HS
D..⇒
Code 10500
WSC 06388
Fault reader V.A.G 1551 displays control unit identification, e.g.:

- 8D1906018.. · Control unit number / (refer to Parts List)
- 1.8l · Engine capacity
- R4S/5V · In-line engine, 4-cyl. normally aspirated / 5-valve
- MOTR · Motronic
- HS / - AT · HS = Manual gearbox / AT = Automatic gearbox
- GRA · Only displayed for vehicles with cruise control system
- ... · Data level (software version) of control unit
- Code 10500 · Control unit code (encoding / => Page ) 01-81
- WSC 06388 · Workshop code from V.A.G 1551 with which encoding was last performed

Notes:

Incorrect encoding can lead to poorer emission values and greater strain on the automatic gearbox due to gearshift jolts.
Incorrect encoding also results in non-existent faults being stored in the fault memory.

If encoding does not coincide with corresponding version in vehicle:

Check engine control unit encoding
=> Page
01-81
, Encoding engine control unit
Press ⇒key.

Rapid data transfer
HELP
Select function XX
Indicated on display:

Note:

Pressing HELP key prints out a list of possible functions.