Connecting vehicle diagnostic, testing and information system VAS 5051 and selecting functions — AUDI

Test requirements:

Supply voltage of vehicle electrical system OK
Fuses OK.

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

Notes:

The various vehicle diagnostic, testing and information system VAS 5051 functions are described in the relevant operating instructions.
The structure and function of the vehicle diagnostic, testing and information system VAS 5051 are described in self-study program no. 202. This also contains some examples of the correct application of this system.

Self-diagnosis can also be performed with fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 in mode -1- "Rapid Data Transfer". The various functions are described in the relevant operating instructions.

Connect the vehicle diagnostic, testing and information system VAS 5051 to the vehicle's 16-pin diagnostic connector using diagnostic cable VAS 5051/1, with the ignition switched off.
Switch the ignition on.

or

Start the engine.

Note:

Observe the notes for final control diagnosis on Page
01-41
.

Select function "Vehicle self-diagnosis" on VAS 5051.

Select vehicle system "18 - additional/auxiliary heater".

Notes:

The prompt to select a vehicle system appears in display zone -1-.
Vehicle systems (for all vehicle models and equipment) which are intended for self-diagnosis but at the moment cannot be displayed on the screen, can be displayed by "rolling " the screen display with scroll bar -2-.

Wait until "Select diagnostic function" appears in display zone -1-on the VAS 5051 display.

Notes:

The control unit identification now appears in display zone -2- of VAS 5051 =>Page
01-19
.

If the message "Vehicle system not available" appears in display zone -1-of the VAS 5051 display, check:

The voltage supply to the -J162 control unit of the additional heater using current flow diagram.

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

The wiring from the 16-pin diagnostic connector to the -J162 additional heater control unit.

If an additional display zone -2- appears with the text "Diagnostic bus faulty" with reference to the possible cause on the VAS 5051 display, check:

Power supply to 16-pin diagnostic socket according to current flow diagram

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

The voltage and the state of the vehicle battery

=> Electrical System; Repair group 01
Electrical System

The message "Diagnostic bus faulty"with reference to the possible cause on the VAS 5051 display also appears, if during the self-diagnosisa fault occurred or the data exchange between the VAS 5051 and the -J162 control unit for additional heater was interrupted.
By selecting the "Print" function on the VAS 5051 display, you can print out the current screenshot.
By selecting the "Help" function on the VAS 5051 display, you can display possible fault causes.

By pressing the keys depicted in the VAS 5051 display, you can skip back and forth in the program (arrow keys) or change the functions.

Using the VAS 5051 display, you can now start the desired function => Table "Available functions", Page
01-21

Control unit identification (in display zone -2-, example)

- 18 - Additional/auxiliary heater · Selected vehicle system
- 8Z0 815.069 X / - or / - 4D0 815 071 X · Part-No.; assignment / => Parts List
- Diesel additional heater · Additional heater for a vehicle with diesel engine
- XXXX · Data level (hardware and software version) of control unit
- Code XXXXX: · Encode control unit =>Page 01-61
- WSC XXXXX: · Workshop code with which the last encoding / adaption took place.

Notes:

Due to the possibility to adjust the CO2-content in the exhaust, the auxiliary/additional heaters with the control unit as of software version "D49" which are designed for the Audi A6 or A8) may also be installed on the Audi A2 as additional heater.

=> Parts List

Auxiliary/additional heater with part number 4D0 265 105 as of index "H"
Auxiliary/additional heater with part number 4B0 265 105 as of index "E"
Additional heater with part number 4D0 265 071 as of index "B"

The control unit identification is dependent on the vehicle equipment; the exact assignment can be found in:

=> Parts List

The additional heater is only intended for vehicles with diesel engine; activation takes place automatically via the engine control unit, and only if the "Econ" mode is selected on the operating and display unit of the air conditioner / heater controls.
The auxiliary heater can only be switched on with the engine running; shut-off on account of undervoltage is therefore unnecessary.

Available functions

Vehicle diagnostic, testing and information system VAS 5051 · Ignition on, engine stopped · Engine idling · Vehicle running · Page
Address words
18 · Additional/auxiliary heater · yes · yes · yes · 01-14
00 · Automatic test sequence · yes · yes · yes · 01-14
Functions
01 · Interrogating control unit version · yes 1) · yes 1) · yes 1) · 01-14
02 · Interrogating fault memory · yes · yes · yes · 01-24
03 · Final control diagnosis · yes · yes · yes · 01-41
04 · Performing basic setting · yes · yes · no 2) · 01-49
05 · Erasing fault memory · yes · yes · yes · 01-58
06 · End of output · yes · yes · yes · 01-58
07 · Encoding control unit · yes · yes · no 2) · 01-61
08 · Reading measured value block · yes · yes · yes · 01-67
10 · Adaption · yes · yes · no 2) · 01-88

1)
The control unit version is displayed constantly during self-diagnosis with VAS 5051.

2)
It is possible, but inadvisable, to carry out these functions while driving.

Notes:

Self-diagnosis with vehicle diagnostic, testing and information system VAS 5051 is described in this workshop manual.
Self-diagnosis can be performed in the same manner with fault reader V.A.G 1551 or vehicle system tester V.A.G 1552. In order to be able to furnish proof of faults in the event of subsequent queries it is appropriate, before erasing the fault memory, to connect up to vehicle diagnostic, testing and information system VAS 5051 or fault reader V.A.G 1551 and print out the faults found (V.A.G 1552 has no printer).
Only the functions listed here can be used for additional heater self-diagnosis.

Encoding table

Encoding of additional heater:

Code · Significance
0 · 0 · 0 · 0 · 2 · - Recirculating pump -V55 not installed. / Cut-off due to undervoltage is performed with the voltage value entered in adaption function.
0 · 0 · 0 · 1 · 2 · - Recirculating pump -V55 installed / Cut-off due to undervoltage is performed with the voltage value entered in adaption function.

Notes:

Currently no -V55 recirculating pump is installed on the Audi A2, for this reason the coding "00002" must always be entered for heater units operated only as additional heaters.
Additional encoding options for the -J162 control unit are currently not provided for on the Audi A2. Additional encoding options for the control unit are provided for on e.g. the Audi A8.

=> Audi A8 auxiliary/additional heater

=> Audi A6 auxiliary heater