On Board Diagnostic (OBD) - 4.2l v8 5v - Bbd Audi S6 C5

Features

The term "self-diagnosis" or On Board Diagnostic (OBD) relates specifically to the electrical and electronic part of the control system.

The control module is equipped with a Diagnostic Trouble Code (DTC) memory so that the malfunction can be traced quickly in the event of an electronic/electrical component failure or an open circuit.

The advantages of On Board Diagnostic can only be fully exploited by using the Vehicle Diagnostic, Testing and Information System VAS 5051 or the V.A.G 1551 Scan Tool, in operating mode 1 "Rapid data transfer".

Functions which the Vehicle Diagnostic, Testing and Information System VAS 5051 or the V.A.G 1551 Scan Tool can register. See FUNCTIONS WHICH CAN BE SELECTED WHEN USING V.A.G 1551 SCAN TOOL .

The Diagnostic Trouble Code (DTC) memory is a non - volatile memory and thus independent of the power supply.

Note. If the engine control module detects malfunctions which result in a deterioration of exhaust emissions, these malfunctions will be indicated by illumination of the Malfunction Indicator Lamp (MIL) -K83- in the instrument cluster. Explanations on this lamp, see MALFUNCTION INDICATOR LAMP (MIL) -K83-, FUNCTION . Malfunctions related to Electronic Power Control (EPC) are additionally indicated by the Electronic Power Control (EPC) warning lamp -K132- which is situated in the instrument cluster. Explanations on this lamp, see ELECTRONIC POWER CONTROL (EPC) WARNING LAMP -K132- (FOR ELECTRONIC THROTTLE), FUNCTION .

Functions which can be selected when using V.A.G 1551 Scan Tool

The conditions to be met when selecting the desired functions are given in the following table.

V.A.G 1551 SCAN TOOL FUNCTIONS

MODE UNDER ADDRESS WORD 33 (V.A.G 1551 SCAN TOOL)

Mode 1 to mode 9 can be selected under address word 33 .

1. Individual measured values can be read out under mode 1. Mode 1 is not recommended for the Audi workshop as this data can also be read out in greater detail under address word 01/function 04 or function 08.
2. Mode 2 shows the operating conditions under which a malfunction was recognized.
3. The DTC memory was checked with mode 3 and erased with mode 4.
4. Under mode 5 the static size of the oxygen sensors required by law is shown. As these sizes are not directly related to the oxygen sensor diagnosis, mode 5 is insignificant for the Audi workshop.
5. All measured values of components and systems which are not monitored continually can be checked with mode 6.
6. Mode 7 can be used to malfunctions where the Malfunction Indicator Light (MIL) has not yet been switched on as the malfunction has not yet been confirmed (MIL is not on, no malfunction under mode 3).
7. Mode 8 is used to check the tank for leaks .
8. The following vehicle information can be read out with mode 9: VIN, part number and program/data status of engine control module and the check total (this value is an internally calculated value) .

Malfunction Indicator Lamp (MIL) -K83-, function

If exhaust-related malfunctions are recognized by the engine control module these are indicated by switching on the malfunction indicator lamp (MIL) -K83-.

Location of -K83

Scheme 1

Note. When switched on, the malfunction indicator lamp (MIL) -K83 - may flash or illuminate constantly. In any case the Diagnostic Trouble Code (DTC) memory must be checked. See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING .

Flashing of MIL -K83

1. A malfunction is present which under these driving conditions will cause damage to the catalytic converter. In this case continue driving with reduced power only (until MIL goes out or illuminates continuously) and eliminate the malfunction as quickly as possible!

Continuous illumination of malfunction indicator lamp (MIL) -K83

1. A malfunction is present which causes deterioration of the exhaust emission. Check DTC memory for engine control module or automatic transmission .
2. If there is a performance problem or a customer complaint and the malfunction indicator lamp (MIL) -K83- does not illuminate, check DTC memory after function test of malfunction indicator lamp (MIL) -K83 - as DTCs may have been stored which do not switch on the MIL immediately .

Functional check

1. Switch on ignition

The malfunction indicator lamp (MIL) -K83- must illuminate.

1. If malfunction indicator lamp (MIL) -K83 - does not illuminate, check DTC memory. See «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__diagnostic-trouble-code-dtc-memory-checking) .

Electronic Power Control (EPC) warning lamp -K132- (for electronic throttle), function

"EPC" is an abbreviation for Electronic Power Control and refers to the electronic throttle control system.

Location of the EPC warning lamp

Scheme 2

The engine control module switches on the EPC lamp when the ignition is switched on.

After the engine has been started the engine control module tests all parts for malfunctions relating to the electronic throttle control system.

During the test sequence the EPC warning lamp illuminates for about 3 seconds. If this check reveals a malfunction, the warning light remains illuminated.

If a malfunction is detected in the electronic throttle system while the engine is running, the engine control module switches on the EPC warning lamp. At the same time there is an entry into the Diagnostic Trouble Code (DTC) memory of the engine control module (these DTCs are marked in the DTC table).

Functional check on warning lamp

1. Start engine. Specified value: If no DTCs relating to the electronic throttle system are stored in the DTC memory the EPC warning lamp should illuminate for about 3 seconds after the engine is started.

If the EPC warning lamp does not illuminate

1. Check wiring from engine control module to EPC warning lamp in instrument cluster.
2. Check DTC memory of engine control module. See «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__diagnostic-trouble-code-dtc-memory-checking) .

Vehicle Diagnostic, Testing and Information System VAS 5051, connecting and selecting engine control module

All functions which have until now been performed with the V.A.G 1551/1552, can also be performed with the new tester, Vehicle Diagnostic, Testing and Information System VAS 5051 in vehicle self -diagnosis mode

See operating instructions for Vehicle Diagnostic, Testing and Information System VAS 5051.

Scheme 3

1. VAS 5051 Vehicle Diagnostic, Testing and Information System

Test conditions

1. Fuse OK.
2. Battery voltage must be at least 11.5 V.
3. Switch off air conditioner.
4. For vehicles with automatic transmission, the selector lever must be in the "P" or "N" position.

Scheme 4

1. Connect vehicle diagnostic, testing and information system VAS 5051 with diagnostic cable VAS 5051/1 or 3.

In the automatic test sequence function (address word 00), the K -wire adapter VAS 6017 must also be used on vehicles as of model year 2002.

Depending on the function required

1. Switch on ignition

or

Start engine. See FUNCTIONS WHICH CAN BE SELECTED WHEN USING V.A.G 1551 SCAN TOOL .

Selecting operating mode

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

Indicated on display

Scheme 5

Selecting vehicle system

1. Select Motronic Engine Control Module (ECM) -J220
2. Select following on the display: "01 - Engine electronics".

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

Scheme 6

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

The control module identification and the coding appear in display zone -2-. Control module identification example follows

1. 4B0 907 409. Control module number (see also spare parts list)
2. 4.2l Engine capacity
3. V8 / 5V Type of engine (V engine, 8-cyl., 5 -valve)
4. G "G" appears in vehicles with cruise control system
5. D00 Control module software version
6. Code 11752 Coding of engine control module (Coding of engine control module, see «ENGINE CONTROL MODULE (ECM), CODING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__engine-control-module-ecm-coding) )
7. WSC 12345 Workshop Code of Scan Tool which was used to perform last coding

Selecting diagnostic function

At this point all diagnostic functions are available.

Scheme 7

1. Select desired function on display.

For further procedure see repair sequences.

Note. The display zones are displayed in function 04 - Basic settings or 08 - Reading measured value block, from the top downward. If the displays shown in the procedure do not appear in the display: See operating instructions for vehicle diagnostic, testing and information system VAS 5051.

1. Fuse for engine electronics OK.
2. Fuel pump relay OK
3. Battery voltage at least 11 V
4. Ground connections on engine and transmission OK.

Scheme 8

1. Switch ignition off.
2. Connect V.A.G 1551 Scan Tool with diagnostic adapter V.A.G 1551/3A.

In the automatic test sequence function (address word 00), the K -wire adapter VAS 6017 must also be used on vehicles as of model year 2002.

Note. The Data Link Connector (DLC) is located in below the instrument panel to the left of the steering column.

Note. The following describes On Board Diagnostic (OBD) using the V.A.G 1551 Scan Tool only.

Indicated on display

Scheme 9

*Displays appear alternately

1. If no display appears, check diagnostic wires

Depending on the function required

1. Switch ignition on.

or

Start engine. See ON BOARD DIAGNOSTIC (OBD) , "Selectable functions" table.

1. Switch on printer using Print button (Warning lamp in switch illuminates).
2. Press key 1 for "Rapid data transfer".

Indicated on display

Scheme 10

Scheme 11

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

If the display shows one of the messages, run through the procedure as described in the Scan Tool instruction program.

Scheme 12

Scheme 13

Scheme 14

The display on V.A.G 1551 Scan Tool shows the control module identification code. Sample control module identification code is (Scheme 16)

Scheme 15

1. 4B0907558... Control module number (current control module version - see Parts list)
2. 4.2L Engine capacity
3. V8 / 5V Type of engine (V engine, 8-cyl., 5 -valve)
4. G "G" appears in vehicles with cruise control system
5. D... Control module software version
6. Code 11752 Coding of engine control module. See «ENGINE CONTROL MODULE (ECM), CODING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__engine-control-module-ecm-coding) .
7. WSC 06388 Workshop Code from V.A.G 1551 which was used to perform the last coding

Note. Incorrect coding may lead to higher emissions and increased strain on the automatic transmission resulting from harsh gearshift jolts. A wrong coding also leads to storing of non -existent DTCs in the DTC memory.

If the coding differs from the vehicle version, then

1. Check engine control module coding. See «ENGINE CONTROL MODULE (ECM), CODING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__engine-control-module-ecm-coding) .
2. Press -->key.

Indicated on display

Scheme 16

1. WAUZZZ4DZXN002341: 17-digit vehicle identification no. (Vehicle Identification Number)
2. AUZ7Z0X0590944: 14-digit identification number for immobilizer control module

1. Press -->key.

Indicated on display

Scheme 17

Note. Press HELP key to obtain a printout of available functions.

Diagnostic Trouble Code (DTC) memory, checking and erasing

Note. If no DTC is stored in the DTC memory the DTC memory should not be erased unnecessarily as the readiness code is reset.

1. Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or V.A.G 1551 Scan Tool and select engine electronics control module with "Address word" 01. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__vehicle-diagnostic-testing-and-information-system) or «V.A.G 1551 SCAN TOOL, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd) . For this purpose, engine must be running at idle speed.
2. Switch on printer using the Print key (Warning lamp in switch illuminates).

Indicated on display

Scheme 18

1. Operate Scan Tool, taking into account information on display.
2. Press keys 0 and 2 for "Check DTC memory" function and press Q key to confirm entry.

The display shows the number of stored malfunctions or "No DTC detected!".

Scheme 19

If no DTC is stored

1. Press -->key.

If one or more DTCs are stored

The stored DTCs are displayed and printed out one after the other.

The display then shows

Scheme 20

1. Locate and eliminate DTCs listed on printout as per DTC table. See «DIAGNOSTIC TROUBLE CODE (DTC) TABLE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__diagnostic-trouble-code-dtc-table) .
2. Press keys 0 and 5 for "Erase DTC memory" function and press Q key to confirm entry.

Indicated on display

Scheme 21

Note. If the ignition is switched off between checking the DTC memory and erasing the DTC memory, then the DTC memory will not be erased. It is therefore important to follow the procedure exactly, i.e. first check the DTC memory and then erase it.

1. Press -->key.

Indicated on display

Scheme 22

1. Press keys 0 and 6 for the "End output" function and press Q key to confirm entry.

Note. During test and assembly work, malfunctions such as separated connectors may also be recognized by other control modules. Therefore on completion, the DTC memories of all the control modules must be checked and erased. The automatic test sequence must be performed.

Automatic test sequence

1. Press key 0 twice for address word "Automatic test sequence" and confirm entry with Q key. V.A.G 1551 transmits all known address words in sequence.

If a control module answers with its identification, the number of DTCs stored or "No DTC detected" appears on the display.

Any system DTCs stored will be displayed in sequence and printed out. The V.A.G 1551 will then transmit the next address word.

The automatic test sequence has ended when display appears as shown

Scheme 23

1. Erase all DTC memories and then test drive vehicle.
2. Check DTC memories of all control modules again using "automatic test sequence". No DTCs must be stored.

If no DTC is stored

1. Press -->key.

Indicated on display

Scheme 24

1. Press keys 0 and 6 for function "End data transfer" and confirm entry with Q key.

Diagnostic Trouble Code (DTC) table

1. If malfunctions occur in the monitored sensors and components, these are stored in the DTC memory together with an indication of type of malfunction.
2. DTCs relevant to "electronic throttle" are additionally indicated by a warning light (EPC warning lamp) located in the instrument cluster.
3. Malfunctions which cause deterioration of the exhaust emissions are displayed via an exhaust warning lamp (MIL) which is also located in the instrument cluster. Some malfunctions cause the MIL to switch on immediately after detection. Malfunctions also may arise for which the MIL is only switched on when the malfunction is recognized again after the engine has been restarted.
4. If the connector is unplugged from engine control module or if the battery is disconnected, all the stored values in the control module will be erased. However, the contents of the DTC memory are retained. If the engine is then started, it may run rough for a short period. In addition, the following adaptation procedures must be performed after reconnection. See «THROTTLE VALVE CONTROL MODULE, ADAPTATION»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__throttle-valve-control-module-adaptation) .
5. The DTC table is sorted according to the 5 -digit DTC on the left.
6. If a stored malfunction does not appear within the next 40 engine starts, the DTC will be automatically erased.
7. Sporadic malfunctions are marked "SP" (sporadic malfunction) on the V.A.G 1551 display.
8. Do not immediately replace components indicated as faulty by the V.A.G 1551 but first check the wiring and connectors of these components against the wiring diagram. Also check the ground connections against wiring diagram. This is particularly relevant for malfunctions recorded as "occurring sporadically" (SP).
9. If DTC memory was erased, see «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__diagnostic-trouble-code-dtc-memory-checking) . Readiness code must be generated again. See «READINESS CODE, GENERATING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd) .

DTCs P0101 to P1199, VAG 16485 to 17607

DIAGNOSTI TROUBLE CODE P0101 TO P0118

DIAGNOSTIC TROUBLE CODE P0130 TO P0134

DIAGNOSTIC TROUBLE CODE P0136 TO P0140

DIAGNOSTIC TROUBLE CODE P0150 TO P0154

DIAGNOSTIC TROUBLE CODE P0156 TO P0160

DIAGNOSTIC TROUBLE CODE P0300 TO P0308

Note. For malfunctions which may result from lack of fuel, (e.g. misfiring), the DTC "P1250, Fuel level too low" is also displayed. This means that misfiring was not detected as a result of a technical defect, but simply due to insufficient fuel in the tank.

DIAGNOSTIC TROUBLE CODE P0321 TO P0333

DIAGNOSTIC TROUBLE CODE P0340 TO P0346

DIAGNOSTIC TROUBLE CODE P0420 TO P0432

DIAGNOSTIC TROUBLE CODE P0441 TO P0456

DIAGNOSTIC TROUBLE CODE P0501 TO P0507

DIAGNOSTIC TROUBLE CODE P0560 TO P0687

DIAGNOSTIC TROUBLE CODE P1066 TO P1068

DIAGNOSTIC TROUBLE CODE P1102 TO P1110

DIAGNOSTIC TROUBLE CODE P1111 TO P1118

DIAGNOSTIC TROUBLE CODE P1119 TO P1122

DIAGNOSTIC TROUBLE CODE P1127 TO P1131

Note. mult. = multiplicative means that the malfunction occure throughout the tire speed range and load range.

DIAGNOSTIC TROUBLE CODE P1136 TO P1139

Note. add. = additive means that malfunction only has effect during idling

DIAGNOSTIC TROUBLE CODE P1140 TO P1148

DIAGNOSTIC TROUBLE CODE P1149 TO P1173

DIAGNOSTIC TROUBLE CODE P1176 TO P1199

DTCs P1201 to P3262, VAG 17609 to 19718

DIAGNOSTIC TROUBLE CODE P1201 TO P1208

DIAGNOSTIC TROUBLE CODE P1213 TO P1220

DIAGNOSTIC TROUBLE CODE P1225 TO P1232

DIAGNOSTIC TROUBLE CODE P1237 TO P1244

DIAGNOSTIC TROUBLE CODE P1250 & P1296

Note. The information "Fuel level too low" is stored only in conjunction with misfiring or DTCs concerning oxygen sensor control if too little fuel is or was in the tank. The DTC is stored in the control module as static DTC and is not set as a sporadic DTC even if the vehicle is refuelled in the meantime e.g. by the customer.

DIAGNOSTIC TROUBLE CODE P1325 TO P1332

DIAGNOSTIC TROUBLE CODE P1335 TO P1347

DIAGNOSTIC TROUBLE CODE P1355 TO P1363

DIAGNOSTIC TROUBLE CODE P1364 TO P1372

DIAGNOSTIC TROUBLE CODE P1373 TO P1378

DIAGNOSTIC TROUBLE CODE P1386 TO P1410

DIAGNOSTIC TROUBLE CODE P1411 TO P1422

DIAGNOSTIC TROUBLE CODE P1423 TO P1429

Note. DTCs P1427, P1428, and P1429 can only occur on vehicles with automatic transmission.

DIAGNOSTIC TROUBLE CODE P1470 TO P1473

DIAGNOSTIC TROUBLE CODE P1475 & P1476

DIAGNOSTIC TROUBLE CODE P1477 TO P1479

Note. DTC P1479 can only occur on vehicles with automatic transmission.

DIAGNOSTIC TROUBLE CODE P1500 & 1502

DIAGNOSTIC TROUBLE CODE P1511 TO P1516

DIAGNOSTIC TROUBLE CODE P1517 TO P1520

DIAGNOSTIC TROUBLE CODE P1522 TO P1531

DIAGNOSTIC TROUBLE CODE P1534 TO P1539

DIAGNOSTIC TROUBLE CODE P1542 TO P1559

DIAGNOSTIC TROUBLE CODE P1564 TO P1568

DIAGNOSTIC TROUBLE CODE P1569 TO P1573

DIAGNOSTIC TROUBLE CODE P1575 TO P1604

DIAGNOSTIC TROUBLE CODE P1609 TO P1626

DIAGNOSTIC TROUBLE CODE P1630 TO P1648

DIAGNOSTIC TROUBLE CODE P1649 TO P1914

Note. DTCs P1912, P1913, and P1914 can only occur on vehicles with automatic transmission.

DIAGNOSTIC TROUBLE CODE P2181 TO P3262

Output Diagnostic Test Mode (DTM)

For Vehicles up to Model Year 2001 , see OUTPUT DTM SEQUENCE FOR ALL VEHICLES UP TO M.Y. 2001 .

For Vehicles as of Model Year 2002 , see OUTPUT DTM SEQUENCE FOR ALL VEHICLES FROM M.Y. 2002 .

Note. The output Diagnostic Test Mode (DTM) can only be performed with the engine stopped and the ignition switched on. The output Diagnostic Test Mode (DTM) is terminated if the engine is started or if an engine speed pulse is detected. During the output Diagnostic Test Mode (DTM) the individual control elements are actuated (approx. 1 minute) the program can be advanced to the next control element by pressing the -->key. The control elements can be checked acoustically or by way of touch. The electric fuel pump runs throughout the output DTM. Engine must be started before repeating the output Diagnostic Test Mode (DTM). (Engine control module must have recognized a speed greater than 300 rpm.)

Output DTM sequence for all vehicles up to m.y. 2001

The output DTM activates the following components in the stated order

1. Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80
2. Secondary Air Injection (AIR) Solenoid Valve -N112
3. Secondary air injection pump relay -J299
4. Intake manifold change -over valve -N156
5. Valve 1 for camshaft adjustment -N205- and valve 2 for camshaft adjustment -N208
6. Leak Detection Pump (LDP) tank ventilation system
7. Intake manifold tuning (IMT) valve 2 -N261- (omitted in S6 models)
8. Engine mounting 1 left (in direction of travel)
9. Engine mounting 2 right (in direction of travel)
10. Cylinder 1 Fuel Injector -N30
11. Cylinder 5 Fuel Injector -N83
12. Cylinder 4 Fuel Injector -N33
13. Cylinder 8 Fuel Injector -N86
14. Cylinder 6 Fuel Injector -N84
15. 14 Cylinder 3 Fuel Injector -N32
16. Cylinder 7 Fuel Injector -N85
17. Cylinder 2 Fuel Injector -N31

Location of control elements, see COMPONENT LOCATIONS OVERVIEW

1. Fuses for engine electronics OK
2. Fuel pump relay OK

1. Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or V.A.G 1551 Scan Tool and select engine electronics control module with "Address word" 01. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__vehicle-diagnostic-testing-and-information-system) or «V.A.G 1551 SCAN TOOL, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd) . For this purpose, ignition must be switched on.

Indicated on display

Scheme 25

1. Press keys 0 and 3 for "Output Diagnostic Test Mode" function

Indicated on display

Scheme 26

1. Confirm input with Q key.

Actuating Evaporative emission (EVAP) canister purge regulator valve -N80

1. Press -->key.

Indicated on display

Scheme 27

Valve will continue to be actuated (clicks) until key is pressed to switch to next control element.

If the valve is not actuated (does not click).

1. Check evaporative emission (EVAP) canister purge regulator valve - N80-. See «EVAP CANISTER PURGE REGULATOR VALVE -N80-, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .

Actuating Secondary Air Injection (AIR) solenoid valve -N112

1. Press -->key.

Indicated on display

Scheme 28

Solenoid valve will continue to be actuated (clicks) until -->key is pressed to switch to next control element.

If the secondary air injection solenoid valve does not click

1. Check secondary air injection (AIR) solenoid valve -N112-. See «SECONDARY AIR INJECTION (AIR) SOLENOID VALVE - N112-, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__secondary-air-injection-air-solenoid-valve) .

Actuating Secondary Air Injection (AIR) pump relay - J299

1. Press -->key.

Indicated on display

Scheme 29

Secondary air injection (AIR) pump relay -J299- actuates secondary air injection (AIR) pump motor -V101-. This runs in intervals.

If actuates secondary air injection (AIR) pump motor -V101- does not run in intervals

1. Check secondary air injection (AIR) pump relay -J299- (in electronic box of plenum chamber). See «SECONDARY AIR INJECTION (AIR) PUMP RELAY - J299-, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__secondary-air-injection-air-pump-relay) .

Actuating Intake manifold change -over valve -N156

1. Press -->key.

Indicated on display

Scheme 30

The valve must click.

If the valve is not actuated (does not click)

1. Check intake manifold change-over valve -N156-. See «INTAKE MANIFOLD CHANGE-OVER, CHECKING (A6 MODELS)»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__intake-manifold-change-over-checking-a6-models) or «INTAKE MANIFOLD CHANGE-OVER, CHECKING (S6 MODELS)»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__intake-manifold-change-over-checking-s6-models) .

Actuating camshaft adjustment valves

1. Press -->key.

Indicated on display

Scheme 31

If the valve 1 or the valve 2 are not actuated (one valve or neither of the valves are clicking)

Valve 1 for camshaft adjustment -N205- and the valve 2 for camshaft adjustment -N208 are actuated for approx. 1minute (click).

1. Check valves for camshaft adjustment. See «CAMSHAFT TIMING CONTROL, CHECKING»(/audi/s6/c5-1999-2004/remont/ignition-system/#ignitionglow-plug-system-42l-v8-5v-bbd) .

Actuating Leak Detection Pump (LDP) -V144- of tank ventilation system

1. Press -->key.

Indicated on display

Scheme 32

Change-over valve in LDP is activated for approximately 1 minute (clicks), unless button is pressed first to switch to next actuator.

Note. The click can be heard by listening near the left rear wheelhousing.

If the valve is not actuated (does not click)

See LEAK DETECTION PUMP (LDP) -V144-, CHECKING .

Actuating Intake Manifold Tuning (IMT) valve 2 -N261- (test omitted in S6 models)

1. Press key.

Indicated on display

Scheme 33

The valve must click.

If the valve is not actuated (does not click).

1. Check Intake Manifold Tuning (IMT) valve 2 -N261-. See «INTAKE MANIFOLD CHANGE-OVER, CHECKING (A6 MODELS)»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__intake-manifold-change-over-checking-a6-models) or «INTAKE MANIFOLD CHANGE-OVER, CHECKING (S6 MODELS)»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__intake-manifold-change-over-checking-s6-models) .

Checking left and right engine mountings

1. Press -->key.

Indicated on display

Scheme 34

If the solenoid valve is not actuated (does not click).

1. Check engine mounting. See «ENGINE MOUNTINGS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__engine-mountings-checking) .
2. Press -->key.

Indicated on display

Scheme 35

If the solenoid valve is not actuated (does not click).

1. Check engine mounting. See «ENGINE MOUNTINGS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__engine-mountings-checking) .

Actuating injectors

Note. The injectors are activated according to the firing sequence, i.e. cyl. 1, cyl. 5, cyl. 4, cyl. 8, cyl. 6, cyl. 3, cyl. 7, cyl. 2.

1. Press -->key.

Indicated on display

Scheme 36

1. Press -->key.

After key is pressed, injector must click five times.

Indicated on display

Scheme 37

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press -->key.

Indicated on display

Scheme 38

1. Press key.

After key is pressed, injector must click five times.

Indicated on display

Scheme 39

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press -->key.

Indicated on display

Scheme 40

1. Press --> key.

After --> key is pressed, injector must click five times.

Indicated on display

Scheme 41

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press -->key.

Indicated on display

Scheme 42

1. Press key. After --> key is pressed, injector must click five times.

Indicated on display

Scheme 43

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press --> key.

Indicated on display

Scheme 44

1. Press --> key. After --> key is pressed, injector must click five times.

Indicated on display

Scheme 45

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press --> key.

Indicated on display

Scheme 46

1. Press --> key.

After --> key is pressed, injector must click five times.

Indicated on display

Scheme 47

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press -->key.

Indicated on display

Scheme 48

1. Press --> key. After --> key is pressed, injector must click five times.

Indicated on display

Scheme 49

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press --> key.

Indicated on display

Scheme 50

1. Press --> key. After --> key is pressed, injector must click five times.

Indicated on display

Scheme 51

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press --> key.

Indicated on display

Scheme 52

1. Press --> key.

Display function selection

Scheme 53

Note. The output Diagnostic Test Mode (DTM) can only then be started again after the engine has started and the ignition has been switched off and on again.

1. Press keys 0 and 6 for "End output" function and press Q key to confirm entry.

The output Diagnostic Test Mode (DTM) activates the following components in the stated order

1. Evaporative emission (EVAP) canister purge regulator valve -N80
2. Secondary air injection (AIR) solenoid valve -N112
3. Secondary air injection (AIR) pump relay -J299
4. Intake manifold change -over valve -N156
5. Camshaft timing control, bank 2
6. Intake manifold tuning (IMT) valve -N261 - The following text is displayed in S6 models: Intake air switch-over valve -N335
7. Engine mounting 1 left (in direction of travel)
8. Engine mounting 2 right (in direction of travel)
9. Camshaft timing control, bank 1
10. Cylinder 1 Fuel Injector -N30
11. Cylinder 5 Fuel Injector -N83
12. Cylinder 4 Fuel Injector -N33
13. Cylinder 8 Fuel Injector -N86
14. Cylinder 6 Fuel Injector -N84
15. Cylinder 3 Fuel Injector -N32
16. Cylinder 7 Fuel Injector -N85
17. Cylinder 2 Fuel Injector -N31

Location of control elements, see COMPONENT LOCATIONS OVERVIEW

1. Fuses for engine electronics OK
2. Fuel pump relay OK.

1. Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or V.A.G 1551 Scan Tool and select engine electronics control unit with "Address word" 01. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__vehicle-diagnostic-testing-and-information-system) or «V.A.G 1551 SCAN TOOL, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd) . For this purpose, ignition must be switched on.

Indicated on display

Scheme 54

1. Press keys 0 and 3 for "Output Diagnostic Test Mode" function

Scheme 55

Indicated on display

1. Confirm input with Q key.

1. Press -->key.

Indicated on display

Scheme 56

Valve will continue to be actuated (clicks) until -->key is pressed to switch to next control element.

If the solenoid valve is not actuated (does not click).

1. Check Evaporative emission (EVAP) canister purge regulator valve - N80-. See «EVAP CANISTER PURGE REGULATOR VALVE -N80-, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .

1. Press key.

Indicated on display

Solenoid valve will continue to be actuated (clicks) until -->key is pressed to switch to next control element.

If the secondary air inlet valve does not click

1. Check secondary air injection (AIR) solenoid valve -N112 -. See «SECONDARY AIR INJECTION (AIR) SOLENOID VALVE - N112-, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__secondary-air-injection-air-solenoid-valve) .

1. Press -->key.

Indicated on display

Scheme 57

Secondary air injection (AIR) pump relay -J299- actuates secondary air injection pump motor -V101-. This runs in intervals.

If the secondary air injection (AIR) pump motor -V101- does not run in intervals

1. Check secondary air injection (AIR) pump relay -J299- (in electronic box of plenum chamber). See «SECONDARY AIR INJECTION (AIR) PUMP RELAY - J299-, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__secondary-air-injection-air-pump-relay) .

1. Press -->key.

Indicated on display

Scheme 58

If the valve is not actuated (does not click).

The valve must click.

1. Check intake manifold change-over valve -N156-. See «INTAKE MANIFOLD CHANGE-OVER, CHECKING (A6 MODELS)»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__intake-manifold-change-over-checking-a6-models) or «INTAKE MANIFOLD CHANGE-OVER, CHECKING (S6 MODELS)»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__intake-manifold-change-over-checking-s6-models) .

Bank 2, actuating valve for camshaft adjustment

1. Press -->key.

Indicated on display

Scheme 59

Valve 2 for camshaft adjustment -N208- is actuated for approx. 1 minute (click).

If the valve 2 is not actuated (the valve does not click)

1. Check valve for camshaft adjustment. See «CAMSHAFT TIMING CONTROL, CHECKING»(/audi/s6/c5-1999-2004/remont/ignition-system/#ignitionglow-plug-system-42l-v8-5v-bbd) .

1. Press --> key.

Indicated on display

Scheme 60

Change-over valve in LDP is activated for approximately 1 minute (clicks), unless --> button is pressed first to switch to next actuator.

Note. The click can be heard by listening near the left rear wheelhousing.

If the valve is not actuated (does not click)

See LEAK DETECTION PUMP (LDP) -V144-, CHECKING .

Intake air switch-over valve -N335- (S6 models)

1. Press -->key.

Indicated on display: in A6 models

Scheme 61

Indicated on display: in S6 models

Scheme 62

Solenoid valve must click.

If the solenoid valve is not actuated (does not click).

1. Check intake manifold tuning valve 2 -N261 -. See «INTAKE MANIFOLD CHANGE-OVER, CHECKING (A6 MODELS)»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__intake-manifold-change-over-checking-a6-models) or «INTAKE MANIFOLD CHANGE-OVER, CHECKING (S6 MODELS)»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__intake-manifold-change-over-checking-s6-models) .
2. Test intake air switch-over valve -N335-. See «INTAKE AIR SWITCH -OVER VALVE -N335»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .

1. Press -->key.

Indicated on display

Scheme 63

If the solenoid valve is not actuated (does not click).

1. Check engine mounting. See «ENGINE MOUNTINGS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__engine-mountings-checking) .
2. Press -->key.

Indicated on display

Scheme 64

If the solenoid valve is not actuated (does not click).

1. Check engine mounting. See «ENGINE MOUNTINGS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__engine-mountings-checking) .

Bank 1, actuating valve for camshaft adjustment

1. Press -->key.

Indicated on display

Scheme 65

Valve 1 for camshaft adjustment -N205 - is actuated for approx. 1 minute (click).

If the valve 1 is not actuated (the valve does not click)

1. Check valve for camshaft adjustment. See «CAMSHAFT TIMING CONTROL, CHECKING»(/audi/s6/c5-1999-2004/remont/ignition-system/#ignitionglow-plug-system-42l-v8-5v-bbd) .

Note. The injectors are activated according to the firing sequence, i.e. cyl. 1, cyl. 5, cyl. 4, cyl. 8, cyl. 6, cyl. 3, cyl. 7, cyl. 2.

1. Press -->key.

Indicated on display

Scheme 66

1. Press --> key. After --> key is pressed, injector must click five times.

Indicated on display

Scheme 67

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press -->key.

Indicated on display

Scheme 68

1. Press --> key. After --> key is pressed, injector must click five times.

Indicated on display

Scheme 69

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press --> key.

Indicated on display

Scheme 70

1. Press --> key. After --> key is pressed, injector must click five times.

Indicated on display

Scheme 71

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press -->key.

Indicated on display

Scheme 72

1. Press --> key. After --> key is pressed, injector must click five times.

Indicated on display

Scheme 73

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press --> key.

Indicated on display

Scheme 74

1. Press --> key. After --> key is pressed, injector must click five times.

Indicated on display

Scheme 75

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press --> key.

Indicated on display

Scheme 76

1. Press --> key. After --> key is pressed, injector must click five times.

Indicated on display

Scheme 77

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press -->key.

Indicated on display

Scheme 78

1. Press --> key. After --> key is pressed, injector must click five times.

Indicated on display

Scheme 79

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press -->key.

Indicated on display

Scheme 80

1. Press --> key. After --> key is pressed, injector must click five times.

Indicated on display

Scheme 81

If the injector does not click

1. Test injectors. See «INJECTORS, CHECKING»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd) .
2. Press --> key.

Indicated on display

Scheme 82

1. Press -->key.

Display function selection

Scheme 83

Note. The output Diagnostic Test Mode (DTM) can only then be started again after the engine has started and the ignition has been switched off and on again.

1. Press keys 0 and 6 for "End output" function and press Q key to confirm entry.

With engine stopped and ignition switched on, the following operation can be performed with the "Function 04" basic setting

1. Adaptation of the throttle valve control module to the engine control module display group 60

With the "engine running", the following operations can be performed in the basic setting mode "Function 04"

1. Adaptation of the oxygen sensor control. See «CHECKING OXYGEN SENSOR LEARNED VALUES AND OXYGEN SENSOR CONTROL»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__checking-oxygen-sensor-learned-values-and) .
2. Troubleshooting by selective activation and deactivation of the oxygen sensor control. See «CHECKING OXYGEN SENSOR LEARNED VALUES AND OXYGEN SENSOR CONTROL»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-bbd__checking-oxygen-sensor-learned-values-and) .

Test conditions for operations with engine running

1. No DTC stored in DTC memory
2. Coolant temperature at least 85 C.
3. Electrical consumers switched off (radiator fan must not run during the check)
4. Air conditioner switched off
5. Gear selector lever in P or N position
6. Wheels in straight -ahead position
7. Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or V.A.G 1551 Scan Tool and select engine electronics control module 1 with "Address word" 01. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__vehicle-diagnostic-testing-and-information-system) or «V.A.G 1551 SCAN TOOL, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd) . For this purpose, engine must be running at idle speed.
8. Checking and erasing Diagnostic Trouble Code (DTM) memory. «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__diagnostic-trouble-code-dtc-memory-checking) . No DTCs must be stored (if necessary, correct malfunction, erase DTC memory, switch off and re -start engine, perform test drive and check DTC memory again.
9. Leave engine idling.

Indicated on display

Scheme 84

1. Press keys 0 and 4 for function "Basic Setting" and confirm entry by pressing Q key.

Indicated on display

Scheme 85

1. Select required display group number from display group overview in "Measured Value Block" section.

Note. Display group number 000 is used here as an example to demonstrate the procedure.

1. Press key 0 three times.

(000 is used to select the function "display group 000").

Note. After the display group number is selected, the EGR valve is closed and the air conditioner compressor is switched off.

Indicated on display

Scheme 86

1. Confirm entry with Q key.

Indicated on display

Scheme 87

Scheme 88

1. Allow engine to idle for a few minutes; coolant temperature at least 85 °C (display zone 1: at least 180).

Note. Each time the PRINT key is pressed, the current display readout is printed out. Press the C key before selecting further display groups.

1. If specifications are achieved in all display zones, press -->-key.

Indicated on display

Scheme 89

1. Press keys 0 and 6 for "End output" function and press Q key to confirm entry.

Indicated on display

Scheme 90

Engine Control Module (ECM), coding

Note. If the appropriate code for the vehicle is not displayed or if the control module has been replaced, the control module must be coded. During control module identification a 5 -digit code must always be displayed. Incorrect coding may lead to higher emissions and increased strain on the automatic transmission resulting from harsh shifting jolts.

1. Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or V.A.G 1551 Scan Tool and select engine electronics control unit with "Address word" 01. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__vehicle-diagnostic-testing-and-information-system) or «V.A.G 1551 SCAN TOOL, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd) . For this purpose, ignition must be switched on.

Indicated on display

Scheme 91

1. Press keys 0 and 7 for function "Code control module" and confirm entry with Q key.

Indicated on display

Scheme 92

1. Enter appropriate code number for this vehicle (see «CODING VARIATIONS FOR THE ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__coding-variations-for-the-engine-control) ) and confirm with Q key.

Compose the code number as follows (example)

USA, TLEV (emission standard) 06

4WD with traction control system 7

Automatic transmission 5

Audi A6 and S6 2

Code number (example) 06 7 5 2

The display on V.A.G 1551 Scan Tool shows the control module identification code e.g.

Scheme 93

1. Press -->key.

Indicated on display

Scheme 94

1. Press keys 0 and 6 for "End output" function and press Q key to confirm entry.
2. Switch ignition off and then on again.

Note. The next time the ignition is switched on the newly entered code will be activated.

Coding variations for the engine control module

CODING VARIATIONS FOR ENGINE CONTROL MODULE

Note. "ASR" means Traction Control System "ESP" means Electronic Stabilization Program

Safety precautions

Note the following points if testers and measuring instruments have to be used during a road test

1. Coolant temperature at least 85 °C
2. Electrical consumers switched off (radiator fan must not run during the check)
3. Air conditioner switched off
4. Gear selector lever in P or N position
5. No Diagnostic Trouble Code (DTC) stored in DTC memory

Procedure

1. Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or V.A.G 1551 Scan Tool and select engine electronics control unit 1 with "Address word" 01. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__vehicle-diagnostic-testing-and-information-system) or «V.A.G 1551 SCAN TOOL, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd) . For this purpose, engine must be running at idle speed.

Indicated on display

Scheme 95

1. Press keys 0 and 8 for function "Read measured value block" and confirm entry with Q key.

Indicated on display

Scheme 96

1. Enter relevant display group number (3 figures) and confirm entry by pressing Q key.

Note. The choice of display group depends on the particular functions and components to be tested.

Display readout (for example)

Scheme 97

Note. To change to another display group, proceed as follows

CHANGING DISPLAY GROUPS

Readiness code

The readiness code appears as an 8 -digit display on measured value block 086, display zone 1. Each of the 8 digits is allocated to a particular emission -related system.

If the function of these systems is checked by On Board Diagnostic (OBD) through a test which has to be run fully, the position in the 8 -digit display is set from "1" to "0". This happens regardless whether the test is performed with "OK" or with "not OK". This is under the condition that the test has been fully completed.

If a test is performed fully but with "not OK" a Diagnostic Trouble Code (DTC) is stored in the DTC memory. Checking DTC memory. See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING .

If the readiness code is produced after the test has been run successfully it is also called "0 0 0 0 0 0 0 0" (measured value block 086, display zone 1).

The readiness code is reset to

"1 1 1 1 1 1 1 1" if

1. DTC memory has been erased
2. A new engine control module is installed.

Test sequence

1. Connect vehicle diagnostic, testing and information system VAS 5051 or V.A.G 1551 Scan Tool and select engine electronics control unit with "Address word" 01. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__vehicle-diagnostic-testing-and-information-system) or «V.A.G 1551 SCAN TOOL, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd) . For this purpose, the ignition must be switched on.

Indicated on display

Scheme 98

1. Press keys 0 and 8 for function "Read measured value block" and confirm entry with Q key.

Indicated on display

Scheme 99

1. Press keys 0,8 and 6 for "display group number 86" and confirm entry by pressing Q key.

Display readout

Scheme 100

1. Check readiness code in display zone 1 Specified value: 0 0 0 0 0 0 0 0

DISPLAY GROUP 086: READINESS CODE

Note on display zone 1

This display shows which diagnosis was checked since the last erasing of the DTC memory or use of the new control module. After erasing the DTC memory all checkable values are set to 1. After test OK the values are set to 0 .

Note on display zones 2, 3 and 4

This display shows which diagnosis was started since the last engine start. When engine is switched off the conditions of the diagnosis are set to 1. After diagnosis has been performed the checkable values are set to 0 .

Scheme 101

Note. The readiness code is only generated when all the display positions are 0

Scheme 102

Scheme 103

Scheme 104

If the specified value in display zone 1: "0 0 0 0 0 0 0 0" is achieved

1. Press -->key.

Display function selection)

Scheme 105

1. For control check DTC memory. See «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__diagnostic-trouble-code-dtc-memory-checking) . (No DTC must be stored.)

If specified value is not attained

1. Generate readiness code. See «READINESS CODE, GENERATING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd) .

Special tools and workshop equipment required

1. Engine speed controller V.A.G 1788/10

1. Engine off
2. Electrical consumers switched off (coolant fan must not run during the test).
3. Coolant temperature at least 80 °C.

Operation 1: Checking DTC memory

1. Connect vehicle diagnostic, testing and information system VAS 5051 or V.A.G 1551 Scan Tool and select engine electronics control unit with "Address word" 01 «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd__vehicle-diagnostic-testing-and-information-system) or «V.A.G 1551 SCAN TOOL, CONNECTING AND SELECTING ENGINE CONTROL MODULE»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd) . Ignition must be switched on.

Indicated on display

Scheme 106

1. Enter "02" for function "Check DTC memory" and confirm entry with Q key.

The display shows the number of stored DTCs or "No DTC detected!"

Scheme 107

If a DTC is stored

1. Correct malfunction and erase DTC memory. Perform a road test and check DTC memory again to check.

If no DTC is stored

1. Press -->key.

Operation 2: Erase DTC memory

1. Ignition switched on

Indicated on display

Scheme 108

1. Enter "05" for function "Erase DTC memory" and confirm entry with Q key.

Note. The readiness code is reset when the DTC memory is erased and must therefore be reproduced.

Indicated on display

Scheme 109

1. Press -->key.

The readiness code can be generated in two ways

1. When driving with varying loads the exhaust relevant tests are initiated by the control module and the readiness code generates itself. or
2. Generate the readiness code as follows.

1. Engine idling
2. Coolant temperature greater than 85 °C (display group 4, display zone 3)

Indicated on display

Scheme 110

1. Press keys 0 and 4 for function "Basic Setting" and confirm entry by pressing the Q key.

Indicated on display

Scheme 111

1. Enter "070" for "display group number 070" and confirm entry with Q key.

Display readout

Scheme 112

1. Check specification in display zone 4

DISPLAY GROUP 070: DIAGNOSIS OF EVAP CANISTER PURGE REGULATOR VALVE

Note on display zone 3

A display only occurs when the diagnostic result occurred not due to a deviation of the oxygen sensor control (e.g. oxygen sensor 1 from EVAP canister) but due to a deviation of the idling controller within a certain tolerance range. Otherwise display zone 3 remains empty .

If specification "FTBV OK" is attained

1. Press C key.

Operation 4: Diagnosis of fuel supply system

1. Engine idling
2. Oxygen sensor control active

Initiate basic setting Q

Scheme 113

1. Enter "107" for "display group number 107" and confirm entry with Q key.

Display readout

Scheme 114

1. Check specification in display zone 4

DISPLAY GROUP 107: DIAGNOSIS FUEL SUPPLY SYSTEM

If specified value in display zone 4 "Syst OK" is attained

1. Press C key.

Operation 5: Checking oxygen sensor heater

Initiate basic setting Q

Scheme 115

1. Enter "041" for "display group number 041" and confirm entry with Q key.

Display readout

Scheme 116

1. Check specified values in display zones 1 and 3

Note. By increasing the engine speed the achieving of the specified values can be accelerated.

DISPLAY GROUP 41: OXYGEN SENSOR HEATING, BANK 1 AT IDLING SPEED

1. Press C key.
2. Press keys 0, 4 and 2 for "display group number 42" and confirm entry with Q key.

DISPLAY GROUP 42: OXYGEN SENSOR HEATING, BANK 2 AT IDLING SPEED

Important notes for display groups 41 and 42: Display zones 1 and 3

1. If the oxygen sensors have not reached their operating temperature there is no display in display zones 1 and 3, i.e. both zones are empty. (Increase engine speed to achieve specified values) .
2. After reaching the operating temperature of both oxygen sensors a resistance of lower than 0.9 Ohm must be shown in display zones 1 and 3 .
3. Only continue with test when a resistance value lower than 0.9 kOhm is shown in display zones 1 and 3 .

1. Press C key.

1. Increase engine speed until exhaust temperature 200 °C display zone 2 has been reached.

Indicated on display

Scheme 117

1. Enter "034" for "display group number 034" and confirm entry with Q key.

Display readout

Scheme 118

1. Check specification in display zone 4

DISPLAY GROUP 034: OXYGEN SENSOR AGING, OXYGEN SENSOR BEFORE CATALYTIC CONVERTER (BANK 1)

If the specified value in display zone 4 "B1 -P1 OK" is attained

1. Press C key.
2. Press keys 0, 3 and 5 for "display group number 35" and confirm entry with Q key.

DISPLAY GROUP 035: OXYGEN SENSOR AGING, OXYGEN SENSOR BEFORE CATALYTIC CONVERTER (BANK 2)

If the specified value in display zone 4 "B2 -P1 OK" is attained

1. Press C key.

Operation 7: Diagnosis of oxygen sensor condition behind catalytic converter.

1. Engine idling

Indicated on display

Scheme 119

1. Enter "036" for "display group number 036" and confirm entry with Q key.

Display readout

Scheme 120

1. Check specified values in display zones 2 and 4.

DISPLAY GROUP 036: CONDITION OF OXYGEN SENSOR BEHIND CATALYTIC CONVERTER (BANKS 1 AND 2)

If the specified value in

Display zone 2 "B1-P2 OK" and in

Display zone 4 "B2-P2 OK" is achieved

1. Press C key.

Operation 8: Diagnosis, oxygen sensor control system

1. Engine idling

Indicated on display

Scheme 121

1. Enter "037" for "display group number 037" and confirm entry with Q key.

Display readout

Scheme 122

1. Check specification in display zone 4

DISPLAY GROUP 037: OXYGEN SENSOR CONTROL SYSTEM (BANK 1)

If specified value in display zone 4 "Syst OK" is attained

1. Press C key.
2. Press keys 0, 3 and 8 for "display group number 38" and confirm entry with Q key.

DISPLAY GROUP 038: OXYGEN SENSOR CONTROL SYSTEM (BANK 2)

If the specified value in display zone 4 "Syst OK" is attained

1. Press C key.

Operation 9: Catalytic converter diagnosis

Indicated on display

Scheme 123

1. Enter "046" for "display group number 046" and confirm entry with Q key.

Display readout

Scheme 124

1. Increase engine speed to approx. 3000 rpm until the exhaust temperature 550 C (display zone 2) is reached, and then leave engine idling.

1. Check specification in display zone 4

Note. The test duration for the catalytic converter diagnosis is approx. 60 seconds.

DISPLAY GROUP 046: CATALYTIC CONVERTER DIAGNOSIS (BANK 1)

If the specified value in display zone 4 "Cat B1 OK" is attained

1. Press C key.
2. Press keys 0, 4 and 7 for "display group number 47" and confirm entry with Q key.

DISPLAY GROUP 047: CATALYTIC CONVERTER DIAGNOSIS (BANK 2)

If the specified value in display zone 4 "Cat B2 OK" is attained

1. Press C key.

Operation 10: Diagnosis of secondary air system

1. Increase engine speed to approx. 1800...2400 rpm and use speed adjuster V.A.G 1788/10 to keep the engine speed.

Indicated on display

Scheme 125

1. Enter "077" for "display group number 077" and confirm entry with Q key.

Display readout

Scheme 126

1. Check specification in display zone 4

Note. Duration of test of catalytic converter diagnosis is approx. 60 seconds.

DISPLAY GROUP 077: DIAGNOSIS SECONDARY AIR SYSTEM (BANK 1)

If specified value in display zone 4 "Syst OK" is attained

1. Press C key.
2. Press keys 0, 7 and 8 for "display group number 78" and confirm entry with Q key.

DISPLAY GROUP 078: DIAGNOSIS SECONDARY AIR SYSTEM (BANK 2)

If specified value in display zone 4 "Syst OK" is attained

1. Press -->key.

Operation 11: Reading readiness code

1. Read readiness code (for control reasons) again. See «READINESS CODE, READING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-bbd) .

See also:
• SAFETY PRECAUTIONS
• THROTTLE VALVE CONTROL MODULE, ADAPTATION
• MASS AIR FLOW (MAF) SENSOR -G70-, CHECKING
• INTAKE AIR TEMPERATURE (IAT) SENSOR -G42-, CHECKING
• ENGINE COOLANT TEMPERATURE (ECT) SENSOR -G62-, CHECKING
• OXYGEN SENSOR HEATING, CHECKING
• OXYGEN SENSOR SIGNAL WIRING AND ACTUATION, CHECKING
• MISFIRE DETECTION, CHECKING
• ENGINE SPEED (RPM) SENSOR -G28-, CHECKING
• KNOCK SENSOR (KS) 1 -G61- AND KNOCK SENSOR (KS) 2 -G66-, CHECKING
• CAMSHAFT POSITION (CMP) SENSOR -G40- AND CAMSHAFT POSITION (CMP) SENSOR 2 -G163-, CHECKING
• FUEL SUPPLY SYSTEM - ALL ENGINES
• ON BOARD DIAGNOSTIC (OBD) - 2001 AND UP
• MOTRONIC ENGINE CONTROL MODULE (ECM) POWER SUPPLY RELAY -J271 -, CHECKING
• BRAKE LIGHT SWITCH -F- AND BRAKE PEDAL SWITCH -F47-, CHECKING
• MOTRONIC ENGINE CONTROL MODULE (ECM) -J220-, REPLACING
• CHECKING OXYGEN SENSOR LEARNED VALUES AND OXYGEN SENSOR CONTROL
• OXYGEN SENSOR CONTROL AND HEATED OXYGEN SENSORS -G39- AND -G108- BEFORE CATALYTIC CONVERTER, CHECKING
• OXYGEN SENSOR CONTROL AND OXYGEN SENSORS (02S) -G130- AND -; G131- BEHIND THREE WAY CATALYTIC; CONVERTER (TWC), CHECKING
• ANGLE SENSOR -1- FOR THROTTLE DRIVE (POWER ACCELERATOR ACTUATION) -G187 - AND ANGLE SENSOR -2- FOR THROTTLE DRIVE (POWER ACCELERATOR ACTUATION) -G188 -, CHECKING
• KNOCK CONTROL STOP, CHECKING
• OUTPUT STAGES FOR IGNITION COILS, CHECKING
• SECONDARY AIR SYSTEM
• SECONDARY AIR INJECTION (AIR) SOLENOID VALVE - N112-, CHECKING
• ELECTRIC VACUUM PUMP
• EVAP CANISTER/TANK LEAK DIAGNOSTIC SYSTEM, SERVICING - FWD & AWD
• FUEL PUMP (FP) RELAY -J17- AND RELAY ACTUATION, CHECKING
• INTAKE MANIFOLD CHANGE-OVER, CHECKING (A6 MODELS)
• INTAKE MANIFOLD CHANGE-OVER, CHECKING (S6 MODELS)
• CRASH SIGNAL, CHECKING
• CLUTCH VACUUM VENT VALVE SWITCH -F36-, CHECKING
• ENGINE MOUNTINGS, CHECKING
• ON BOARD DIAGNOSTIC (OBD)
• EXCHANGE OF DATA BETWEEN CONNECTED CONTROL MODULES, CHECKING
• THROTTLE POSITION (TP) SENSOR -G79- AND SENDER 2 FOR ACCELERATOR PEDAL POSITION - G185-, CHECKING
• ON BOARD DIAGNOSTIC (OBD)
• THERMOSTAT, REMOVING AND INSTALLING
• COMPONENT LOCATIONS OVERVIEW
• SECONDARY AIR INJECTION (AIR) PUMP RELAY - J299-, CHECKING
• LEAK DETECTION PUMP (LDP) -V144-, CHECKING
• FUNCTIONS WHICH CAN BE SELECTED WHEN USING V.A.G 1551 SCAN TOOL
• MALFUNCTION INDICATOR LAMP (MIL) -K83-, FUNCTION
• ELECTRONIC POWER CONTROL (EPC) WARNING LAMP -K132- (FOR ELECTRONIC THROTTLE), FUNCTION
• DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING
• ENGINE CONTROL MODULE (ECM), CODING
• ON BOARD DIAGNOSTIC (OBD)
• VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051, CONNECTING AND SELECTING ENGINE CONTROL MODULE
• DIAGNOSTIC TROUBLE CODE (DTC) TABLE
• OUTPUT DIAGNOSTIC TEST MODE (DTM)
• OUTPUT DTM SEQUENCE FOR ALL VEHICLES UP TO M.Y. 2001
• CODING VARIATIONS FOR THE ENGINE CONTROL MODULE
• OPERATION 4: DIAGNOSIS OF FUEL SUPPLY SYSTEM
• IMPORTANT NOTES FOR DISPLAY GROUPS 41 AND 42: DISPLAY ZONES 1 AND 3