01 ON BOARD DIAGNOSTIC (OBD)
ON BOARD DIAGNOSTIC (OBD)
On Board Diagnostic (OBD), technical data
Equipment
Data is transmitted between the control module and the VAS5051 tester via operating mode "On Board
Diagnostic (OBD)".
DTC memory is designed for permanent memory and is therefore not dependent on voltage supply.
Display of stored DTCs occurs after initiation of display mode. Refer to Diagnostic Trouble Code
(DTC) memory, checking .
DTC memory must be erased after malfunction is repaired. Refer to Diagnostic Trouble Code (DTC)
memory, erasing .
Important:
Readiness code must be generated every time DTC memory is erased. Refer to Readiness code,
generating .
If the ECM recognizes malfunctions that lead to a worsening of emissions values, it indicates them by
lighting the Malfunction Indicator Lamp (MIL) -K83- in the instrument cluster. Meaning of exhaust
Malfunction Indicator Lamp (MIL) -K83-. Refer to Exhaust Malfunction Indicator Lamp (MIL) in
instrument cluster .
EPC relevant malfunctions are also indicated by the Electronic Power Control (EPC) warning lamp in the
instrument cluster.
Exhaust Malfunction Indicator Lamp (MIL) in instrument cluster
If the ECM recognizes malfunctions that lead to a worsening of emissions values, it indicates them by lighting
the exhaust Malfunction Indicator Lamp (MIL).
The Engine Control Module (ECM) switches on the exhaust Malfunction Indicator Lamp (MIL) after ignition is
switched on. Shortly after engine is started, the exhaust MIL will go out. This requires, first of all, that the
Engine Control Module (ECM) does not detect a malfunction that worsens the emissions values and, secondly,
that activation of the lamp by the Engine Control Module (ECM) is OK.
If malfunctions that worsen emissions are recognized during operation of the engine, the ECM switches on the
exhaust MIL in instrument cluster. An entry is made in DTC memory at the same time.
The Malfunction Indicator Lamp (MIL) can blink or remain lit continuously. DTC memory should be checked
in either case. Refer to Diagnostic Trouble Code (DTC) memory, checking .
Continuously lit:
There is a malfunction that causes increased emissions. Check DTC memory for Motronic ECM and automatic
2005 Audi A4 Quattro
ENGINE PERFORMANCE 3.0 Liter 6-Cyl. 5V Fuel Injection & Ignition, Engine Code(s): AVK, BGN
2005 Audi A4 Quattro
ENGINE PERFORMANCE 3.0 Liter 6-Cyl. 5V Fuel Injection & Ignition, Engine Code(s): AVK, BGN
12:18:17 AM Page 1 12:18:29 AM Page 1
transmission (if installed).
Check DTC memory if there is a drivability problem or a customer complaint, but the exhaust Malfunction
Indicator Lamp (MIL) is not lit. There may be DTCs stored that do not cause the exhaust MIL to light up
immediately, but only after engine is started again and malfunction is recognized again.
Blinking:
There is a malfunction that causes damage to the catalytic converter in this driving condition (e.g. combustion
misfire). In this case, vehicle must only be driven at reduced power!
Exhaust Malfunction Indicator Lamp (MIL), checking
Function test of warning lamp
Switch ignition on.
Warning lamp for On Board Diagnostic (Malfunction Indicator Lamp -MIL-) must light up
Start engine.
Shortly after engine is started, the Malfunction Indicator Lamp (MIL) will go out if there are no
malfunctions stored in the DTC memory that relate to the emissions system
Safety precautions
Vehicle diagnostic, testing and information system VAS5051, connecting and select functions
Test requirements
Fuses for engine electronics OK
NOTE: The switch-on signal for the Malfunction Indicator Lamp (MIL) is transferred
from the Engine Control Module (ECM) to the instrument cluster via CAN-bus.
Check data exchange between the Engine Control Module (ECM) and other CAN
capable control modules. Refer to Data exchange between engine control
module and other CAN - control modules, checking
NOTE: The following points if testers and measuring instruments have to be used
during a road test:
WARNING:
Always install testers and measuring instruments on the back seat
and have a second person operate them from there.
If test equipment were operated from the front passenger seat, the
person sitting there could be injured if the front passenger airbag
were triggered in the event of an accident.
2005 Audi A4 Quattro
ENGINE PERFORMANCE 3.0 Liter 6-Cyl. 5V Fuel Injection & Ignition, Engine Code(s): AVK, BGN
12:18:17 AM Page 2
Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations
Battery voltage at least 12.7 V
Ground connections on engine and transmission OK.
Procedure
Switch ignition off.
Fig. 1: Identifying Vehicle Diagnosis, Testing and Information System VAS 5051 and Data Link
Connector (DLC)
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Connect up vehicle diagnostic, testing and information system VAS5051 with diagnostic wire
VAS5051/1.
Refer to Operating instructions of vehicle diagnostic, testing and information system VAS5051
WARNING: Note the safety precautions. Refer to Safety precautions
NOTE: A DTC message appears on the display:
2005 Audi A4 Quattro
ENGINE PERFORMANCE 3.0 Liter 6-Cyl. 5V Fuel Injection & Ignition, Engine Code(s): AVK, BGN
12:18:17 AM Page 3
Fig. 2: Diagnostic System VAS 5051: Display
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Display on VAS5051:
Press "vehicle self-diagnosis" button.
Fig. 3: Diagnostic System VAS 5051: Display
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Display on VAS5051:
NOTE: The automatic test sequence is carried out by pressing "00 - Check Diagnostic
Trouble Code (DTC) memory - Total system" in selection -1-, i.e. the DTC
memories of all vehicle systems with On Board Diagnostic (OBD) capability are
checked.
2005 Audi A4 Quattro
ENGINE PERFORMANCE 3.0 Liter 6-Cyl. 5V Fuel Injection & Ignition, Engine Code(s): AVK, BGN
12:18:17 AM Page 4
Fig. 4: Diagnostic System VAS 5051: Display
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Display on VAS5051:
Depending on which function is required "Diagnostic functions" table: Refer to Vehicle diagnostic, testing and
information system VAS5051, connecting and select functions :
Switch ignition on.
or
Start engine.
Select vehicle system "01 - Engine electronics" in selection -1-.
Wait until next display appears.
Fig. 5: VAS 5051 Tester Displaying Control Module Identification And Coding
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Display on VAS5051:
1 - Control module identification of engine control module. Refer to Vehicle diagnostic, testing and
information system VAS5051, connecting and select functions
2005 Audi A4 Quattro
ENGINE PERFORMANCE 3.0 Liter 6-Cyl. 5V Fuel Injection & Ignition, Engine Code(s): AVK, BGN
12:18:17 AM Page 5
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Description
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