2007 Audi A4 (B7) Service & Repair Manual

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

2 - Control module identification of immobilizer. Refer to Vehicle diagnostic, testing and information system VAS5051, connecting and select functions  Press delta button. Fig. 6: Diagnostic System VAS 5051: Display Courtesy of VOLKSWAGEN UNITED STATES, INC. Display on VAS5051: 1 - Selection of diagnostic functions: Control module identification Engine control module (example) 01 - Engine electronics Vehicle system 8E0909559.. Part-No.; assignment 3.0 liter 1) V6/5 V 2) G 3) 0003 4) 1) 2) 3) 4) Engine capacity Engine, 6-cylinder/5-valve)  G = cruise control system activated  No display = no cruise control system or cruise control system not activated Control module data status (software type) Code 16751: Code of control module (check. Refer to Control module, coding ) Dealership No. 12345 Workshop code of VAS5051 with which coding was last performed Control module identification, immobilizer (example) WAUXXX8EX2A054321 1) AUZ7Z0X1137197 2) 1) 2) 17-digit vehicle identification no. (VIN) 14-digit ident no. for immobilizer 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 6

DIAGNOSTIC TROUBLE CODE (DTC) MEMORY Diagnostic Trouble Code (DTC) memory, checking  Connect vehicle diagnostic, testing and information system VAS5051. Refer to Vehicle diagnostic, testing and information system VAS5051, connecting and select functions and select vehicle system "01 - Engine electronics" in selection. Engine should be idling. Diagnostic functions Ignition on, Engine stopped Engine idling Vehicle running Refer to 02 Checking Diagnostic Trouble Code (DTC) memory No Yes Yes Refer to Diagnostic Trouble Code (DTC) memory, checking 03 Final control diagnosis Yes No No Refer to Output Diagnostic Test Mode (DTM) 04 Basic setting No Yes No Refer to Basic setting 05 Erasing DTC memory Yes Yes Yes Refer to Diagnostic Trouble Code (DTC) memory, checking 06 End of output Yes Yes Yes Refer to Ending output 07 Coding control module Yes No No Refer to Control module, coding 08 Reading measured value block Yes Yes Yes Refer to Measured value block, reading 09 Reading individual measured value No No No - 10 Adaptation No Yes No Refer to Adaptation 11 Coding II Yes No No Refer to Login procedure or coding II NOTE: If the engine will not start, crank it for at least 5 seconds with the starter and leave the ignition on. 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 7

Fig. 7: Diagnostic System VAS 5051: Display Courtesy of VOLKSWAGEN UNITED STATES, INC. Display on VAS5051:  Under -1- select diagnostic function "02 - check DTC memory". Fig. 8: Identifying Content Of DTC Memory & Identification Of Fault On Diagnostic System VAS 5051 Display Courtesy of VOLKSWAGEN UNITED STATES, INC. Display on VAS5051: 1 - Contents of DTC memory 0 Faults recognized or X Faults recognized 2 - Fault Fault code 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 8

Fault location Fault type A - If malfunctions were recognized:  Print out screen content or On Board Diagnostic (OBD) report.  Exit function "02 - check DTC memory" by pressing <-- button. Fig. 9: Diagnostic System VAS 5051: Display Courtesy of VOLKSWAGEN UNITED STATES, INC. Display on VAS5051:  Repair DTC(s) as specified in DTC table. Refer to Diagnostic Trouble Code (DTC) table .  Reselect diagnostic function "02 - Check DTC memory" and erase the DTC memory. Refer to Diagnostic Trouble Code (DTC) memory, erasing .  Select diagnostic function "06 - End output" in selection. Refer to Ending output . B - If no malfunction was recognized:  Select diagnostic function "06 - End output" in selection. Refer to Ending output . Diagnostic Trouble Code (DTC) memory, erasing Requirements  DTC memory checked. Refer to Diagnostic Trouble Code (DTC) memory, checking .  All malfunctions repaired. After DTC memory has been successfully checked: NOTE: If it is not possible to erase DTC memory, check it once again and remedy malfunctions. 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 9

Fig. 10: Diagnostic System VAS 5051: Display Courtesy of VOLKSWAGEN UNITED STATES, INC. Display on VAS5051:  Under -1- select diagnostic function "05 - Erase DTC memory". Fig. 11: Diagnostic System VAS 5051: Display Courtesy of VOLKSWAGEN UNITED STATES, INC. Display on VAS5051: No display (before erasing) or DTC memory erased NOTE: The following message appears in display zone -1-: "DTC memory not yet checked", if the operational sequence was not adhered to exactly. If the DTC memory has been checked beforehand, the DTC memory can only be erased. NOTE: Should the function be carried out? 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 10

2007 Audi A4 (B7) Service & Repair Manual

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