3.0l 6-cyl 5v Engine Controls - Fuel Injection & Ignition, Engine Code(s): Avk, Bgn Audi A4 B6

On Board Diagnostic (OBD), technical data

Equipment

1. Data is transmitted between the control module and the VAS5051 tester via operating mode "On Board Diagnostic (OBD)".
2. DTC memory is designed for permanent memory and is therefore not dependent on voltage supply.
3. Display of stored DTCs occurs after initiation of display mode. Refer to «Diagnostic Trouble Code (DTC) memory, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__diagnostic-trouble-code-dtc-memory-checking) .
4. DTC memory must be erased after malfunction is repaired. Refer to «Diagnostic Trouble Code (DTC) memory, erasing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__diagnostic-trouble-code-dtc-memory-erasing) .

Important

1. Readiness code must be generated every time DTC memory is erased. Refer to «Readiness code, generating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__readiness-code-generating) .
2. 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»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__exhaust-malfunction-indicator-lamp-mil-in) .
3. 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 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

1. Switch ignition on.

1. Warning lamp for On Board Diagnostic (Malfunction Indicator Lamp -MIL-) must light up

1. Start engine.

1. 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

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

Safety precautions

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

Vehicle diagnostic, testing and information system VAS5051, connecting and select functions

Test requirements

1. Fuses for engine electronics OK

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

1. Battery voltage at least 12.7 V
2. Ground connections on engine and transmission OK.

Procedure

1. Switch ignition off.

Scheme 453

1. Connect up vehicle diagnostic, testing and information system VAS5051 with diagnostic wire VAS5051/1.

Note. A DTC message appears on the display

Refer to Operating instructions of vehicle diagnostic, testing and information system VAS5051

Scheme 454

Display on VAS5051

1. Press "vehicle self-diagnosis" button.

Scheme 455

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.

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

1. Switch ignition on.

or

1. Start engine.
2. Select vehicle system "01 - Engine electronics" in selection -1-.
3. Wait until next display appears.

Scheme 456

Display on VAS5051

1 - Control module identification of engine control module. Refer to Vehicle diagnostic, testing and information system VAS5051, connecting and select functions

2 - Control module identification of immobilizer. Refer to Vehicle diagnostic, testing and information system VAS5051, connecting and select functions

1. Press delta button.

Scheme 457

Display on VAS5051

1 - Selection of diagnostic functions

Diagnostic Trouble Code (DTC) memory, checking

1. Connect vehicle diagnostic, testing and information system VAS5051. Refer to «Vehicle diagnostic, testing and information system VAS5051, connecting and select functions»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__vehicle-diagnostic-testing-and-information-system) and select vehicle system "01 - Engine electronics" in selection. Engine should be idling.

Note. If the engine will not start, crank it for at least 5 seconds with the starter and leave the ignition on.

Display on VAS5051

1. Under -1- select diagnostic function "02 - check DTC memory".

Scheme 458

Display on VAS5051

1 - Contents of DTC memory

0 Faults recognized

or

X Faults recognized

2 - Fault

Fault code

Fault location

Fault type

A - If malfunctions were recognized

1. Print out screen content or On Board Diagnostic (OBD) report.
2. Exit function "02 - check DTC memory" by pressing <-- button.

Display on VAS5051

1. Repair DTC(s) as specified in DTC table. Refer to «Diagnostic Trouble Code (DTC) table»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__diagnostic-trouble-code-dtc-table) .
2. Reselect diagnostic function "02 - Check DTC memory" and erase the DTC memory. Refer to «Diagnostic Trouble Code (DTC) memory, erasing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__diagnostic-trouble-code-dtc-memory-erasing) .
3. Select diagnostic function "06 - End output" in selection. Refer to «Ending output»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__ending-output) .

B - If no malfunction was recognized

1. Select diagnostic function "06 - End output" in selection. Refer to «Ending output»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__ending-output) .

Diagnostic Trouble Code (DTC) memory, erasing

Note. If it is not possible to erase DTC memory, check it once again and remedy malfunctions.

Requirements

1. DTC memory checked. Refer to «Diagnostic Trouble Code (DTC) memory, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__diagnostic-trouble-code-dtc-memory-checking) .
2. All malfunctions repaired.

After DTC memory has been successfully checked

Display on VAS5051

1. Under -1- select diagnostic function "05 - Erase DTC memory".

Scheme 459

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?

Will be erased!

1. Press "OK" button in display -2-.
2. Exit function "05 - Erase DTC memory" by pressing <-- button.
3. Check DTC memory again after repair work and erase it if necessary.

Note. This erases DTCs that have been stored while the malfunction was being fixed, for example, malfunctions that have arisen as a result of connectors being detached.

Ending output

Display on VAS5051

1. Under -1- select diagnostic function "06 - End output".

Display on VAS5051

1. Switch ignition off when this display appears and disconnect diagnostic connector.

Diagnostic Trouble Code (DTC) table

Note. If malfunctions occur in the monitored sensors and components, these are stored in the DTC memory together with an indication of type of malfunction. Malfunctions related to EPC are additionally indicated by the warning lamp for the electronic throttle control ("EPC warning lamp") which is situated in the instrument cluster. Notes on EPC system. Refer to Function of the electronic throttle system . Malfunctions that worsen emissions are indicated by an exhaust warning lamp (MIL) that is also located in the instrument cluster. There are malfunctions that cause the exhaust warning lamp to light up immediately after recognition. Malfunctions can also occur that cause the exhaust MIL to light up, but only if malfunction is recognized again after repeated engine starts. Notes for exhaust warning lamp (MIL). Refer to Exhaust Malfunction Indicator Lamp (MIL) in instrument cluster . The DTC table is sorted according to the 5-digit DTC code on the left. Sporadic malfunctions (malfunction occurring from time to time) are indicated as "sporadic" on the display. The word "sporadic" signifies individually occurring, random malfunctions. Do not immediately replace components indicated as faulty by the VAS5051 but: first check the wiring and connectors of these components against the wiring diagram. Check the Ground connections against wiring diagram. This is particularly relevant for malfunctions recorded as "sporadic". After erasing the DTC memory. Refer to Diagnostic Trouble Code (DTC) memory, checking the readiness code must be regenerated. Refer to Readiness code, generating .

DTCs P0010 to P1130, VAG 16394 to 17538

Note. Diagnosis of the camshaft adjustment is influenced by the oil temperature sensor. If the DTC P0196/16580 "Engine Oil Temperature Sensor -G8-, Incorrect signal" is also stored, first check the sensor. In the case of camshaft adjustment malfunctions, check the oil pressure of the engine.

Refer to 17 ENGINE - LUBRICATION

1. An entry in the DTC memory may also be made due to mechanical problems: running-in process not yet complete (friction), seized camshaft (perform visual check of camshaft bearings).

Note. Diagnosis of the camshaft adjustment is influenced by the oil temperature sensor. If the DTC P0196/16580 "Engine oil temperature sensor -G8-, Incorrect signal" is also stored, first check the sensor. In the case of camshaft adjustment malfunctions, check the oil pressure of the engine.

Refer to 17 ENGINE - LUBRICATION

1. An entry in the DTC memory may also be made due to mechanical problems: running-in process not yet complete (friction), seized camshaft (perform visual check of camshaft bearings).

1) The brake pedal switch (cruise control/diesel direct -F47-) is monitored in addition to the brake light switch -F-.

Note. Mult. = multiplicative means that the malfunction occurs throughout the entire speed range and load range.

DTCs P1136 to P3305 , VAG 17544 to 19761

Note. add. = additive means that malfunction only has effect at idle

Note. The malfunction "Fuel level too low" is stored only in conjunction with misfiring or malfunctions concerning oxygen sensor (O2S) control if too little fuel is or was in the tank. The DTC is stored in the control module as static malfunction and is not set as a sporadic DTC even if the vehicle is refuelled in the meantime.

2) The malfunction is stored with the relevant signal from airbag control module.

3) The malfunction is stored with the relevant signal from airbag control module, also with final control diagnosis of the airbag system.

4) The transmission control module has recognized a malfunction which causes the exhaust emissions of the engine to deteriorate. The malfunction message is sent by the transmission control module to the engine control module which now switches on the Malfunction Indicator Lamp (MIL) -K83-. Notes on MIL -K83-. Refer to Exhaust Malfunction Indicator Lamp (MIL) in instrument cluster . At the same time the message P1624 is displayed in the engine control module as an indication that the MIL -K83- was not switched on due to an engine problem but due to a transmission problem.

Note. Camshaft adjustment diagnostic is influenced by the oil temperature sensor. If the malfunction P0196/16580 "Engine Oil Temperature Sensor -G8-, Incorrect signal" is stored simultaneously, check sensor first. An entry into DTC memory can also occur due to mechanical problems: Running-in process not yet completed (friction), camshaft is seized (perform a visual check of camshaft bearings).

Output Diagnostic Test Mode (DTM)

Note. The Output Diagnostic Test Mode (DTM) (shown as Final Control Diagnosis on scan tool) can only be performed with the engine stopped and the ignition switched on. During actuator diagnosis, the individual actuators (with the exception of the injectors) are operated in turn for about one minute unless the next actuator is selected by pressing the delta button. The control elements can be checked acoustically or by way of touch. Output Diagnostic Test Mode (DTM) is aborted if it is not switched further after one minute of activation time, the engine is started or an RPM signal is recognized. Before restarting the Output Diagnostic Test Mode (DTM) the engine must be started and the ignition switched off and on again.

Vehicles with control module No. 8E0 909...

1) Only on vehicles with automatic transmission.

2) Only in vehicles with hot-country function.

Test requirements

1. Fuses for engine electronics OK

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

Test sequence

1. Connect vehicle diagnostic, testing and information system VAS5051 and select vehicle system "01 -Engine electronics" in selection. Ignition must be switched on.

Display on VAS5051

1. Under -1- select diagnostic function "03 - Final control diagnosis".

Actuating evaporative emission (EVAP) canister purge regulator valve (tank breather valve)

Scheme 460

Display on VAS5051

A - Control element test waiting: Select next step to continue

1 - Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80

1. Press delta button.

Display on VAS5051

A - Control element test running: Continuation permitted

1. This valve is activated (clicks) for approx. 1 minute if the operation is not switched to the next control element by pressing the delta button.

Note. Fuel pump must run during activation time, the flow noise at fuel pressure regulator must be clearly audible. If fuel pump does not run, check activation. Refer to Checking activation of fuel pump relay .

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

1. Check solenoid valve 1 for Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-. Refer to «Evaporative Emission (EVAP) canister purge regulator valve -N80-, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__evaporative-emission-evap-canister-purge-regulator) .

Actuating secondary air injection solenoid valve

1. Press delta button.

Scheme 461

Display on VAS5051

A - Control element test waiting: Select next step to continue

2 - Secondary Air Injection (AIR) solenoid valve -N112

1. Press delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. This valve is activated (clicks) for approx. 1 minute if the operation is not switched to the next control element by pressing the delta button.

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

1. Check Secondary Air Injection (AIR) solenoid valve -N112

Refer to 26 EXHAUST SYSTEM, EMISSION CONTROLS

Actuating secondary air injection pump relay

1. Press delta button.

Scheme 462

Display on VAS5051

A - Control element test waiting: Select next step to continue

3 - Secondary Air Injection (AIR) Pump Relay -J299

1. Press delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

Scheme 463

1. The secondary AIR pump relay -J299- (in relay carrier in electronics box, plenum chamber, position 3) switches the engine for the Secondary Air Injection (AIR) pump motor -V101- on and off at approx. 1 minute intervals if the operation has not been switched to the next control element by pressing the delta button.

If secondary air pump does not run intermittently

1. Check Secondary Air Injection (AIR) pump relay -J299

Refer to 26 EXHAUST SYSTEM, EMISSION CONTROLS

Actuation of intake manifold change-over valve

1. Press delta button.

Scheme 464

Display on VAS5051

A - Control element test waiting: Select next step to continue

4 - Intake manifold change-over valve -N156

1. Press delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. This valve is activated (clicks) for approx. 1 minute if the operation is not switched to the next control element by pressing the delta button.

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

1. Check intake manifold change-over valve -N156-. Refer to «Intake manifold change-over, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .

Actuating intake camshaft adjustment valve, Bank 1

1. Press delta button.

Scheme 465

Display on VAS5051

A - Control element test waiting: Select next step to continue

5 - Bank 1, Valve -1- for camshaft adjustment -N205

1. Press delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. This valve is activated (clicks) for approx. 1 minute if the operation is not switched to the next control element by pressing the delta button.

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

1. Check camshaft adjustment valves

Refer to 15 ENGINE - CYLINDER HEAD, VALVETRAIN

Activating Leak Detection Pump (LDP) tank ventilation system

1. Click on delta button

Scheme 466

Display on VAS5051

A - Control element test waiting: Select next step to continue

6 - Leak Detection Pump (LDP) tank ventilation system

1. Click on delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. The Leak Detection Pump (LDP) -V144- is activated in intervals for approx. 1 minute (clicks), unless the delta button is pressed first to switch to the next actuator.

Note. Operating noise of Leak Detection Pump (LDP) is softly audible at left rear wheelhouse.

If Leak Detection Pump (LDP) is not activated (no operating noise audible)

1. Check Leak Detection Pump (LDP)

Refer to 20 - FUEL SUPPLY SYSTEM

Actuating intake camshaft adjustment valve, Bank 2

1. Press delta button.

Scheme 467

Display on VAS5051

A - Control element test waiting: Select next step to continue

7 - Bank 2, Valve -2- for camshaft adjustment -N208

1. Press delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. This valve is activated (clicks) for approx. 1 minute if the operation is not switched to the next control element by pressing the delta button.

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

1. Check camshaft adjustment valves

Refer to 15 ENGINE - CYLINDER HEAD, VALVETRAIN

Actuating exhaust camshaft adjustment valve, Bank 1

1. Press delta button.

Scheme 468

Display on VAS5051

A - Control element test waiting: Select next step to continue

8 - Bank 1, camshaft adjustment (exhaust)

1. Press delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. This valve is activated (clicks) for approx. 1 minute if the operation is not switched to the next control element by pressing the delta button.

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

1. Check camshaft adjustment valves

Refer to 15 ENGINE - CYLINDER HEAD, VALVETRAIN

Actuating exhaust camshaft adjustment valve, Bank 2

1. Press delta button.

Scheme 469

Display on VAS5051

A - Control element test waiting: Select next step to continue

9 - Bank 2, camshaft adjustment (exhaust)

1. Press delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. This valve is activated (clicks) for approx. 1 minute if the operation is not switched to the next control element by pressing the delta button.

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

1. Check camshaft adjustment valves

Refer to 15 ENGINE - CYLINDER HEAD, VALVETRAIN

Actuating brake vacuum pump 1)

1) Only on vehicles with automatic transmission.

1. Press delta button.

Scheme 470

Display on VAS5051

A - Control element test waiting: Select next step to continue

10 - Activation of brake vacuum pump

1. Press delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. The brake servo vacuum pump, left front in engine compartment, must start up for a short time, unless the operation has been switched to the next control element by pressing the delta button.

If the brake servo vacuum pump does not start up

1. Check brake servo vacuum pump

Refer to 47 - BRAKES - HYDRAULIC COMPONENTS

Actuating coolant fan control

1. Press delta button.

Scheme 471

Display on VAS5051

A - Control element test waiting: Select next step to continue

11 - Coolant FC (Fan Control) activation 1

1. Press delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

Scheme 472

1. Coolant FC (Fan Control) Control Module -J293- (top right on fan frame -arrow-) slowly regulates coolant fan once up to maximum RPM, unless the delta button is pressed first, to switch to the next actuator.

If the fan does not start

1. Check coolant fan and Coolant FC (Fan Control) Control Module -J293-.

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

Actuating relay for coolant run-on pump 2)

2) only in vehicles with hot-country function

1. Press delta button.

Scheme 473

Display on VAS5051

A - Control element test waiting: Select next step to continue

12 - Coolant Circulation Pump Relay -J151

1. Press delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. The Coolant Circulation Pump Relay -J151- switches the pump for coolant run-on on and off at one minute intervals unless the delta button is first pressed to switch to the next control element.

If the after-run coolant pump does not start

1. Check whether hot-country function is coded. Refer to «Login procedure or coding II»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .

Actuating injectors

Scheme 474

Note. The injectors are actuated according to the ignition sequence: cyl. 1, cyl. 4, cyl. 3, cyl. 6, cyl. 2, cyl. 5.

1. Press delta button.

A - Control element test waiting: Select next step to continue

13 - Cylinder 1 Fuel Injector -N30

1. Press delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. After pressing the delta button the injector must click five times.

1. Use this procedure to check all injectors in sequence.

If one of the injectors is not actuated (does not click)

1. Test injectors. Refer to «Fuel injectors, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .
2. After activating last injector (cylinder 5) press delta button.

Scheme 475

Display on VAS5051

A - Control element test waiting: Select next step to continue

14 - Cylinder 4 Fuel Injector -N33

1. Click on delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. Fuel injector must click 5 times after delta button is pressed.

1. Click on delta button

Scheme 476

Display on VAS5051

A - Control element test waiting: Select next step to continue

15 - Cylinder 3 Fuel Injector -N32

1. Click on delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. Fuel injector must click 5 times after delta button is pressed.

1. Click on delta button

Scheme 477

Display on VAS5051

A - Control element test waiting: Select next step to continue

16 - Cylinder 6 Fuel Injector -N84

1. Click on delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. Fuel injector must click 5 times after delta button is pressed.

1. Click on delta button

Scheme 478

Display on VAS5051

A - Control element test waiting: Select next step to continue

17 - Cylinder 2 Fuel Injector -N31

1. Click on delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. Fuel injector must click 5 times after delta button is pressed.

1. Click on delta button

Scheme 479

Display on VAS5051

A - Control element test waiting: Select next step to continue

18 - Cylinder 5 Fuel Injector -N83

1. Click on delta button again.

Display on VAS5051

A - Control element test running: Continuation permitted

1. Fuel injector must click 5 times after delta button is pressed.

If one of the fuel injectors is not activated (does not click).

1. Check fuel injectors. Refer to «Fuel injectors, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .
2. Click on delta button

Scheme 480

Display on VAS5051

A - control element test is completed

1. Exit function "03 - Final control diagnosis" by pressing <-- button.

Note. Before restarting the Output Diagnosis Test Mode (DTM) the engine must be started and the ignition switched off and on again.

Basic setting

With engine stopped and ignition switched on, the following operation can be carried out with the function "04 - Basic setting"

1. Adaptation of the throttle valve control module to the engine control moduledisplay group 060 (Refer to «Throttle valve control module -J338-, adaptation»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__throttle-valve-control-module-j338-adaptation) )
2. Vehicles with automatic transmission: Adaptation of kick down function of accelerator position sensor to engine control module. Refer to Display group 063 (Refer to «Kickdown function, adapting»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__kickdown-function-adapting) )

With the engine running, the following operations can be performed with the basic setting function

1. Generation of readiness code (mixture adaptation. Refer to «Readiness code, generating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__readiness-code-generating) )
2. Performance of mixture preparation system test (Refer to «Vacuum system, checking for leaks»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) onward)

Test conditions for operations with engine running

1. No DTCs stored in DTC memory
2. Engine coolant temperature (ECT) at least 80°C.
3. Electrical accessories switched off (coolant fan must not run during the test).
4. Air conditioning switched off.

1. Vehicles with automatic transmission: Selector lever in position P or N.

Test sequence

1. Connect vehicle diagnostic, testing and information system VAS5051. Refer to «Vehicle diagnostic, testing and information system VAS5051, connecting and select functions»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__vehicle-diagnostic-testing-and-information-system) and select vehicle system "01 - Engine electronics" in selection. Ignition must be switched on.

or after each required process

1. Start engine.

Display on VAS5051

1. Under -1- select diagnostic function "04 - Basic setting".

Scheme 481

Display on VAS5051

1 - Enter display group

1. Enter desired display group number (three figures) in zone -2- and confirm entry by pressing -Q- button.

Example

1. Enter "001" for "display group number 001" and confirm entry with -Q- button.

Scheme 482

Display on VAS5051

1 - Measured values not in basic setting

2 - Measured values in basic setting

3 - Display group X

A - Activate basic setting

Note. Basic setting is initiated after pressing the -A- button.

Scheme 483

Display on VAS5051

1 - Display zone 1

2 - Display zone 2

3 - Display zone 3

4 - Display zone 4

1. Exit function "04 - Basic setting" by pressing <-- button.

Control module, coding

1. Connect vehicle diagnostic, testing and information system VAS5051. Refer to «Vehicle diagnostic, testing and information system VAS5051, connecting and select functions»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__vehicle-diagnostic-testing-and-information-system) and select vehicle system "01 - Engine electronics" in selection. Ignition must be switched on.

Display on VAS5051

1. Under -1- select diagnostic function "07 - Code control module".

Display on VAS5051

1 - Enter code word

1. Enter 7-digit control module code in zone -2- in accordance with coding table. Refer to «Coding table»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__coding-table) .

Key to code

Coding table

1. Confirm entry with -Q- button.

Display on VAS5051

1 - Coding is being performed

1. Wait until next display appears.

Scheme 484

Display on VAS5051

1 - Coding performed in vehicle system

2 - Control module identification with new code

(previous code in brackets)

1. Exit function "07 - Coding control module" by pressing <-- button.
2. Switch ignition off and then switch on again after 15 seconds.

Note. The next time the ignition is switched on the newly entered code will be activated. If the ignition is not switched off and on after the correct code has been entered, it will not be possible to erase DTC "01044 Control module incorrectly coded"). In the case of non-hot country vehicles, the hot-country function (activation of the pump for coolant run-on) must be deactivated in function 11 - Login, or function 11 - Coding II. Refer to Hot-country function, activating/deactivating after installation of the new control module, a DTC memory entry is made.

Measured value block, reading

Test requirements

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

Test sequence

1. Connect vehicle diagnostic, testing and information system VAS5051. Refer to «Vehicle diagnostic, testing and information system VAS5051, connecting and select functions»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__vehicle-diagnostic-testing-and-information-system) and select vehicle system "01 - Engine electronics" in selection. Ignition must be switched on.

or after each required process

1. Start engine.

Display on VAS5051

1. Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS5051

1 - Enter display group: max. input value = 255

1. Enter desired display group number (three figures) in zone -2- and confirm entry by pressing -Q- button.

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

Scheme 485

Display on VAS5051

1 - Read Measured Value Block

2 - Display zone 1

Display zone 2

Display zone 3

Display zone 4

3 - Display group X

1. Exit function "08 - Read measured value block" by pressing <-- button.

Note. If no display follows, a display field is not assigned. To switch to a different display group, proceed as follows

1. Press <-- button to end function "08 - Read measuring value block".

Adaptation

Note. The idling speed can be decreased or increased by using the "Adaptation" function, channel 01. Only perform the idling speed adaptation described in the following: in order to eliminate vibration noises or they are the cause of a customer complaint.

Procedure

1. Connect vehicle diagnostic, testing and information system VAS5051. Refer to «Vehicle diagnostic, testing and information system VAS5051, connecting and select functions»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__vehicle-diagnostic-testing-and-information-system) and select vehicle system "01 - Engine electronics" in selection. Engine must be running at idling speed.

Display on VAS5051

1. Under -1- select diagnostic function "10 - Adaptation".

Display on VAS5051

1 - Enter channel number

1. Enter "01" for "Adaptation channel 011" and confirm by pressing -Q- button.

Scheme 486

Display on VAS5051

1 - Read out and test

Channel X

2 - Display text of selected channel

or

No display

5 - The scroll bar indicates the current adaptation value

Note. Adaptation value 128 is the factory-set idling speed, Adaptation can be performed by moving the scroll bar. Refer to A - Changing adaptation value using scroll bar or by simply entering the new adaptation value. Refer to B - Adaptation by direct entry .

A - Changing adaptation value using scroll bar

Display on VAS5051

1. Move scroll bar -5- in desired direction or click on area next to scroll bar, which will move it in desired direction.
2. Press "Save" button -4-.

Scheme 487

Display on VAS5051

1 - Save channel X

2 - Display text of selected channel

or

No display

4 - Original value X

New value X

1. Confirm new adaptation value by pressing "Accept" button -3-.

Scheme 488

Display on VAS5051

1 - Channel X

Value X stored

1. Exit function "10 - Adaptation" by pressing <-- button.

Note. An engine speed decrease follows immediately, an increase in engine speed is only effective after briefly pressing the accelerator pedal.

B - Adaptation by direct entry

Display on VAS5051

1. Press "Keypad" button -3-.

Display on VAS5051

1 - Enter adaptation value

1. Enter desired 5-digit adaptation value in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1 - Save

Channel X

2 - Display text of selected channel

or

No display

4 - original value X

New value X

1. Confirm new adaptation value by pressing "Accept" button -3-.

Display on VAS5051

1 - Channel X

Value X saved

1. Exit function "10 - Adaptation" by pressing <-- button.

Note. Immediately following an engine speed decrease, an increase in engine speed is only effective after briefly pressing the accelerator pedal.

Login procedure or coding II

With engine stopped and ignition switched on, the following operations can be carried out with the function "11 - Login, or function 11 - Coding II

1. Activation and deactivation of the cruise control system (CCS). Refer to «Cruise control system, activating/deactivating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__cruise-control-system-activatingdeactivating)
2. Activation and deactivation of the hot-country function (coolant run-on pump for hot countries). Refer to «Hot-country function, activating/deactivating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__hot-country-function-activatingdeactivating)

Cruise control system, activating/deactivating

Note. Vehicles equipped with CCS, the CCS function must be activated after replacement of the engine control module. If the CCS function is activated in the engine control module of a vehicle without CCS, a DTC memory entry is made. If this is the case, the CCS function must be deactivated.

Procedure

1. Connect vehicle diagnostic, testing and information system VAS5051. Refer to «Vehicle diagnostic, testing and information system VAS5051, connecting and select functions»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__vehicle-diagnostic-testing-and-information-system) and select vehicle system "01 - Engine electronics" in selection. Ignition must be switched on.

Display on VAS5051

1. Under -1- select diagnostic function "11 - Coding II".

All models

Display on VAS5051

1 - Enter code word

Activate CCS

1. Enter "11463" in zone -2- and confirm entry by pressing -Q- button.

Deactivate CCS

1. Enter "16167" in zone -2- and confirm the entry by pressing -Q- button.
2. Exit function "11 - Login, or function 11 - Coding II" by pressing <-- button.

Display on VAS5051

1. Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS5051

1 - Enter display group

1. Enter "066" for "display group number 066" in zone -2- and confirm entry by pressing -Q- button.

Scheme 489

Display on VAS5051

1. Check indication in display field -2-.

1. Exit function "08 - Read measured value block" by pressing <-- button.
2. Press "06 - End output".
3. Switch ignition off.

Hot-country function, activating/deactivating

Note. Vehicles for hot countries are equipped with a coolant run-on pump which is actuated by the engine control module. In the case of non-hot country vehicles, the hot-country function must be deactivated after installation of a new control module, as otherwise a fault memory entry is made.

Procedure

1. Connect vehicle diagnostic, testing and information system VAS5051. Refer to «Vehicle diagnostic, testing and information system VAS5051, connecting and select functions»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__vehicle-diagnostic-testing-and-information-system) and select vehicle system "01 - Engine electronics" in selection. Ignition must be switched on.

Display on VAS5051

1. Under -1- select diagnostic function "11 - Coding II".

Display on VAS5051

1 - Enter code word

Deactivating hot-country function

1. Enter "50000" for "deactivate hot-country function" in zone -2- and confirm by pressing -Q- button.

Activating hot-country function

1. Enter "60000" for "activate hot-country function" in zone -2- and confirm by pressing -Q- button.
2. Exit function "11 - Login, or function 11 - Coding II" by pressing <-- button.

Display on VAS5051

1. Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS5051

1 - Enter display group

1. Press buttons -1-, -3-, and -2- for "display group number 132" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1. Check indication in display field -4-.

1. Exit function "08 - Read measured value block" by pressing <-- button.
2. Press "06 - End output".
3. Switch ignition off.

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.

The function of each of these systems is checked by the On Board Diagnostic (OBD) and the relevant position for the system in the 8-digit display is changed from "1" to "0" in a test sequence which must be fully completed.

The readiness code produced after successful completion of the test sequence is then "0 0 0 0 0 0 0 0" (measured value block 086, display zone 1).

If an individual test has been completed, but is "not OK", a DTC is entered in the DTC memory. Checking Diagnostic Trouble Code (DTC) memory. Refer to Diagnostic Trouble Code (DTC) memory, checking .

The readiness code is set to "1 1 1 0 0 1 0 1" if

1. The DTC memory has been erased.
2. The voltage supply to the engine control module has been interrupted (e.g. the connector detached, battery disconnected).
3. A new engine control module has been installed.

In this case the readiness code must be reproduced. Refer to Readiness code, generating .

Note. When driving with varying loads the exhaust tests are initiated by the control module and the readiness code generates itself. In this case the concluding control is possibly omitted, i.e. it is not obvious whether the vehicle was handed over to the customer without any malfunctions.

Reading readiness code

Test sequence

1. Connect vehicle diagnostic, testing and information system VAS5051. Refer to «Vehicle diagnostic, testing and information system VAS5051, connecting and select functions»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__vehicle-diagnostic-testing-and-information-system) and select vehicle system "01 -Engine electronics" in selection. Engine must be running at idling speed.

Display on VAS5051

1. Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS5051

1 - Enter display group

1. Enter "086" for "display group number 086" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1. Check indication in display field -1-.

1. Specified value: 0 0 0 0 0 0 0 0

Note on display zone 1

Display zone 1 is the most important. This display indicates which system has been checked by the On Board Diagnostic (OBD) since the last time the DTC memory was erased or since installation of a new control module. After erasing the DTC memory, all testable values are set to "1" and then to "0" after successful completion of the test.

Note. The readiness code is only produced when all display digits in display zone 1 are set to "0".

If the specification "0 0 0 0 0 0 0 0" is achieved in display zone 1

1. Press <-- button.

If specified value is not obtained

1. Generate readiness code. Refer to «Readiness code, generating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__readiness-code-generating) .

Readiness code, generating

Requirements

1. Vehicle stationary.
2. Vehicles with automatic transmission: Selector lever in position P or N.
3. Electrical accessories switched off (coolant fan must not run during the test).
4. Air conditioning switched off.

1. Engine coolant temperature (ECT) at least 80°C. Refer to display group 004, display zone 3). Important: Warm up engine by means of a road test.
2. Engine control module version checked: Refer to «Vehicle diagnostic, testing and information system VAS5051, connecting and select functions»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__vehicle-diagnostic-testing-and-information-system) . Operation 9: Refer to «Operation 9: Diagnosis of tank seal and oxygen sensor interchange recognition behind catalytic converter»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__operation-9-diagnosis-of-tank-seal) , requires different procedures depending on ECM Part No./software version number.

Note. If the test result is immediately displayed as "OK" after selecting a display group during an operation, the test has already been performed and you can continue with the next operation.

Operation 1: Checking DTC memory

Test conditions

1. Engine stopped, ignition switched on

1. Connect vehicle diagnostic, testing and information system VAS5051. Refer to «Vehicle diagnostic, testing and information system VAS5051, connecting and select functions»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__vehicle-diagnostic-testing-and-information-system) and select vehicle system "01 -Engine electronics" in selection. Ignition must be switched on.

Display on VAS5051

1. Under -1- select diagnostic function "02 - Check DTC memory".

Display on VAS5051

1 - Contents of fault memory

0 Faults recognized

or

X Faults recognized

2 - Fault

Fault code

Fault location

Fault type

If a fault is stored

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

If no DTC is stored

1. Press <-- button.
2. Perform next operation.

Operation 2: Erase DTC memory

Test conditions

1. Engine stopped, ignition switched on

Display on VAS5051

1. Under -1- select diagnostic function "05 - Erase DTC memory".

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

Display on VAS5051

1 - No display (before erasing)

or

DTC memory erased

Note. Should the function be carried out?

Will be erased!

1. Press "OK"button in display -2-.
2. Press <-- button.
3. Perform next operation.

Operation 3: Adapting the throttle valve control module to the engine control module

Test conditions

1. Engine stopped, ignition switched on

Display on VAS5051

1. Under -1- select diagnostic function "04 - Basic setting".

Display on VAS5051

1 - Enter display group

1. Enter "060" for "display group number 060" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1. Activate basic setting by pressing -A- button.
2. Check indication in display fields -3- and -4-.

Note on display zone 3

During adaptation, various digits are displayed in display zone 3 which represent the relevant adaptation status. The most crucial factor is not the way in which the adaptation stage counter (display zone 3) behaves during the adaptation process, but that the specification "ADP OK" is displayed after adaptation in display zone 4.

If specification "ADP OK" is obtained

1. Press <-- button.
2. Perform next operation.

Operation 4: Adapting kick down functionl

1) Only on vehicles with automatic transmission.

Test conditions

1. Engine stopped, ignition switched on

Display on VAS5051

1 - Enter display group

1. Enter "063" for "display group number 063" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1. Activate basic setting by pressing -A- button.

Note. You will now be instructed to: "Operate kick down".

1. Fully depress accelerator pedal beyond kickdown point and keep it pressed.

Note. During the kickdown point adaptation process, "Kickdown ADP running" is shown on the display. After successful adaptation of the kickdown point "Kickdown ADP OK" appears on the display.

1. Check indication in display field -4-.

Note on display zone 4

If "ERROR" can be displayed, if e.g. accelerator pedal is not pressed when instructed by tester, or if accelerator pedal was released while adaptation was already running but process was not yet complete. In both cases it is necessary to exit the "Basic setting" mode and restart the adaptation process.

If specification "ADP OK" is obtained

1. Press <-- button.
2. Perform next operation.

Operation 5: Checking operating status of oxygen sensor control

1. Start engine (for vehicles with manual transmission: press clutch pedal).

Note. If necessary, after the engine starts reselect vehicle system "01 - Engine electronics" and diagnostic function "04 - Basic setting".

Test conditions

1. Engine running at idling speed

Display on VAS5051

1 - Enter display group

Max. input value = 255

1. Enter "030" for "display group number 030" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1. Activate basic setting by pressing -A- button.
2. Check indication in display fields -1- to -4-.

Note. By increasing the engine speed the specified values are achieved more quickly. The "oxygen sensor status" indicates the condition of the oxygen sensor control and the oxygen sensors.

Note. The first digit of the relevant 3-digit display (heating) fluctuates between 0 and 1. The oxygen sensor control for oxygen sensor behind catalytic converter (Bank 1, Sensor 2 and Bank 2, Sensor 2) is not active without engine load, i.e. the last digit of the 3-digit display is 0.

1. Continue test when displays have achieved "111" in display zones 1 and 3 and "110" in display zones 2 and 4.
2. Press <-- button.
3. Perform next operation.

Operation 6: Diagnosis of oxygen sensor aging before catalytic converter

Display on VAS5051

1 - Enter display group

Max. input value = 255

1. Enter "197" for "display group 197" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1. Activate basic setting by pressing -A- button.
2. Press accelerator and brake pedal simultaneously. Engine speed increases to approx. 2200 RPM.

Test conditions

1. Accelerator and brake pedal pressed simultaneously, engine runs at approx. 2200 RPM.

1. Check specification in display zone -4-.
2. Check indication in display fields -2- and -4-.

If specified values "B1-S1 OK" and "B2-S1 OK" are obtained

1. Press <-- button.

Operation 7: Diagnosis of oxygen sensor operational readiness behind catalytic converter

Display on VAS5051

1 - Enter display group

1. Enter "193" for "display group number 193" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1. Activate basic setting by pressing -A- button.
2. Press accelerator and brake pedal simultaneously. Engine speed increases to approx. 2200 RPM.

Test conditions

1. Accelerator and brake pedal pressed simultaneously, engine runs at approx. 2200 RPM.

1. Check indication in display fields -2- and -4-.

If specification "B1-S2 OK" and "B2-S2 OK" are obtained

1. Press <-- button.
2. Perform next operation.

Operation 8: Diagnosis of tank ventilation valve

Test requirement

1. Engine running at idle.

Display on VAS5051

1 - Enter display group

1. Enter "195" for "display group number 195" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1. Activate basic setting by pressing -A- button.
2. Check indication in display field -4-.

If specification "Syst. OK" is obtained

1. Press <-- button.

Operation 9: Diagnosis of tank seal and oxygen sensor interchange recognition behind catalytic converter

Test conditions

For ECM up to Part No. 8E0 909 559D, software version D0003

1. Engine running at idling speed

For ECM Part No. 8E0 909 559D, from software version D0004 and ECM 8E0 909 559E, from software version D0001

1. Accelerator and brake pedals fully pressed simultaneously and held in this position until a test result is displayed

Display on VAS5051

1 - Enter display group

1. Enter "196" for "display group number 196" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1. Activate basic setting by pressing -A- button.
2. Check indication in display fields -1- and -4-.

Note. Tank leak diagnostic lasts longer than the oxygen sensor interchange recognition. In case diagnostic leak test is not started, open fuel filler cap briefly (to release pressure).

If the specified value "Syst. OK" is obtained

1. Press <-- button.
2. Perform next operation.

Operation 10: Diagnosis of oxygen sensor aging behind catalytic converter

Display on VAS5051

1 - Enter display group

1. Enter "194" for "display group number 194" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1. Activate basic setting by pressing -A- button.
2. Press accelerator and brake pedal simultaneously, engine speed increases to approx. 2200 RPM.

Test conditions

1. Accelerator and brake pedal pressed simultaneously, engine runs at approx. 2200 RPM.

1. Check indication in display fields -3- and -4-.

If the specified values "B1-S2 OK" and "B2-S2 OK" is obtained

1. Press <-- button.

Operation 11: Catalytic converter diagnosis

Test conditions

1. Engine running at idling speed

Display on VAS5051

1 - Enter display group

1. Enter "198" for "display group number 198" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1. Activate basic setting by pressing -A- button.
2. Press accelerator and brake pedal simultaneously. Engine speed increases to approx. 2200 RPM.

Test conditions

1. Accelerator and brake pedal pressed simultaneously, engine runs at approx. 2200 RPM.

1. Check indication in display fields -2- and -4-.

If specified value "Cat. B1 OK" is obtained

1. Press <-- button.
2. Depress accelerator pedal completely (swiftly) and then release it (brief acceleration to at least 4000 RPM).

1. Perform next operation.

Operation 12: Diagnosis of secondary air injection system

Test conditions

1. Engine running at idling speed

Display on VAS5051

1 - Enter display group

1. Enter "199" for "display group number 199" in zone -2- and confirm entry by pressing -Q- button.
2. Depress gas pedal completely (swiftly) two times and then release it (brief acceleration of at least 4000 RPM).

Display on VAS5051

1. Activate basic setting by pressing -A- button.

Note. During the diagnosis of the secondary air system the secondary air pump runs several seconds.

1. Check indication in display field -4-.

If specification "Syst. OK" is obtained

1. Press <-- button.
2. Perform next operation.

Operation 13: Reading readiness code

1. Read readiness code. Refer to «Reading readiness code»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__reading-readiness-code) .

To reduce the risk of personal injury and/or damage to the fuel injection and ignition system, always observe the following

1. Always switch off ignition before disconnecting or connecting lines of the fuel injection and ignition system, including test leads.
2. If engine is to be cranked at starting RPM without starting (e.g. for compression testing), disconnect connector from ignition coils and from fuel injectors.
3. During some of the tests, a malfunction may be recognized and stored by the control module. At the end of all tests and repairs, the Diagnostic Trouble Code (DTC) memory should be checked and, if necessary, erased. After erasing the Diagnostic Trouble Code (DTC) memory the readiness code must be produced. Refer to «Basic setting»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .
4. Always switch ignition off before cleaning engine.

If special testing equipment is required during road test, note the following

Rules for cleanliness

When working on the fuel supply/injection system, pay careful attention to the following 6 cleanliness rules

1. Thoroughly clean all unions and adjacent areas before disconnecting.
2. Place removed parts on a clean surface and cover. Use lint-free cloths.
3. Carefully cover or seal open components if repairs cannot be carried out immediately.
4. Install clean components: Remove replacement parts from packaging immediately prior to installation. Do not use parts that have been stored loose (e.g. in tool boxes etc..).

1. When the system is open: Do not work with compressed air if this can be avoided. Do not move vehicle unless absolutely necessary.
2. Separated electrical connectors: Protect from dirt and moisture. Make sure connections are dry when re-connecting.

Technical data

1) Depending on engine oil temperature/transmission oil temperature (automatic transmission 01J) an engine speed increase is possible up to 980 RPM.

Scheme 490

1 - Evaporative Emission (EVAP) canister purge regulator valve -N80

1. Checking. Refer to «Evaporative Emission (EVAP) canister purge regulator valve -N80-, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__evaporative-emission-evap-canister-purge-regulator)

2 - Mass Air Flow (MAF) sensor -G70

1. With intake air temperature (IAT) sensor -G42
2. Checking. Refer to «Mass Air Flow (MAF) sensor -G70-, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__mass-air-flow-maf-sensor-g70)

3 - Camshaft Position (CMP) sensor 3 -G300

1. For exhaust camshaft
2. Cylinder bank 1
3. Checking. Refer to «Camshaft Position (CMP) sensor, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__camshaft-position-cmp-sensor-checking)

4 - Camshaft Position (CMP) sensor -G40

1. For intake camshaft
2. Cylinder bank 1
3. Checking. Refer to «Camshaft Position (CMP) sensor, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__camshaft-position-cmp-sensor-checking)

5 - Pressure sensor for brake booster pressure sensor -G294

1. For vehicles with automatic transmission
2. Location. (Scheme 498)

6 - Camshaft Position (CMP) sensor -G163

1. For intake camshaft
2. Cylinder bank 2
3. Checking. Refer to «Camshaft Position (CMP) sensor, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__camshaft-position-cmp-sensor-checking)

7 - Camshaft Position (CMP) sensor 4 -G301

1. For exhaust camshaft
2. Cylinder bank 2
3. Checking. Refer to «Camshaft Position (CMP) sensor, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__camshaft-position-cmp-sensor-checking)

8 - Ignition coils with power output stage, bank 2

1. Ignition Coil 4 with Power Output Stage -N292
2. Ignition Coil 5 with Power Output Stage -N323
3. Ignition Coil 6 with Power Output Stage -N324
4. Checking. Refer to «Ignition coils with output stages, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__ignition-coils-with-output-stages-checking)

9 - Electronics box (plenum chamber)

1. Locations. (Scheme 494)and see scheme 100
2. Location for Motronic Engine Control Module (ECM) -J220
3. Check power supply to engine control module. Refer to «Engine Control Module (ECM) power supply, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__engine-control-module-ecm-power-supply).
4. Procedure following interruption of voltage supply. Refer to «Procedure following interruption of voltage supply»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__procedure-following-interruption-of-voltage-supply)

1. Replace engine control module. Refer to «Engine Control Module (ECM) (without metal anti-theft housing), replacing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__engine-control-module-ecm-without-metal)
2. Location for Motronic Engine Control module (ECM) power supply relay -J271
3. Test for Motronic Engine Control Module (ECM) power supply relay -J271-. Refer to «Motronic Engine Control Module (ECM) power supply relay -J271-, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__motronic-engine-control-module-ecm-power)
4. Location for Secondary Air Injection (AIR) pump relay -J299-.

1. Check Secondary Air Injection (AIR) pump relay -J299

Refer to 26 EXHAUST SYSTEM, EMISSION CONTROLS

1. Location for fuse S130 for secondary air pump
2. Location for Brake booster relay -J569

10 - Brake system vacuum pump -V192

1. For vehicles with automatic transmission

11 - Valve 2 for camshaft adjustment -N208-, Camshaft adjustment valve 2 (exhaust) -N319

1. Cylinder bank 2
2. Checking

Refer to 15 ENGINE - CYLINDER HEAD, VALVETRAIN

12 - Fuel injectors, bank 2

1. Cylinder 4 Fuel Injector -N33
2. Cylinder 5 Fuel Injector -N83
3. Cylinder 6 Fuel Injector -N84
4. Checking. Refer to «Fuel injectors, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn)

1. Removing and installing. Refer to «Fuel injectors, removing and installing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .

13 - Fuel injectors, bank 1

1. Cylinder 1 Fuel Injector -N30
2. Cylinder 2 Fuel Injector -N31
3. Cylinder 3 Fuel Injector -N32
4. Checking. Refer to «Fuel injectors, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn)

1. Removing and installing. Refer to «Fuel injectors, removing and installing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .

14 - Valve 1 for camshaft adjustment -N205- Camshaft adjustment valve 1 (exhaust) -N318

1. Cylinder bank 1
2. Checking

Refer to 15 ENGINE - CYLINDER HEAD, VALVETRAIN

15 - Ignition coils with power output stage, bank 1

1. Ignition Coil 1 with Power Output Stage -N70
2. Ignition Coil 2 with Power Output Stage -N127
3. Ignition Coil 3 with Power Output Stage -N291
4. Checking. Refer to «Ignition coils with output stages, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__ignition-coils-with-output-stages-checking)

16 - Secondary Air Injection (AIR) pump motor -V101

1. Checking

Refer to 15 ENGINE - CYLINDER HEAD, VALVETRAIN

17 - Heated Oxygen Sensor (HO2S) -G39- and Oxygen sensor (O2S) heater -Z19

1. Bank 1, sensor 1
2. Constant Heated Oxygen Sensor (HO2S)
3. Check oxygen sensors and oxygen sensor control before catalytic converter. Refer to «Oxygen sensors and oxygen sensor control before catalytic converter, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__oxygen-sensors-and-oxygen-sensor-control)
4. Check aging of oxygen sensors before catalytic converter. Refer to «Oxygen sensors before catalytic converter, checking aging»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__oxygen-sensors-before-catalytic-converter-checking)

1. Check heating of oxygen sensors before catalytic converter. Refer to «Oxygen sensors before catalytic converter, checking heating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn)
2. Removing and installing. Refer to «Oxygen sensors before catalytic converter, removing and installing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__oxygen-sensors-before-catalytic-converter-removing) .

18 - Bracket for connectors

1. For right side of vehicle
2. Assignment. (Scheme 495)

19 - Oxygen sensor (O2S) behind three way catalytic converter (TWC) -G130- and Oxygen Sensor (O2S) heater 1 -Z29

1. Bank 1, sensor 2
2. Check oxygen sensors and oxygen sensor control behind catalytic converter. Refer to «Oxygen sensors and oxygen sensor control behind catalytic converter, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__oxygen-sensors-and-oxygen-sensor-control)
3. Check heating of oxygen sensors behind catalytic converter. Refer to «Oxygen sensors behind catalytic converter, checking heating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__oxygen-sensors-behind-catalytic-converter-checking)
4. Removing and installing. Refer to «Oxygen sensors behind catalytic converter, removing and installing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__oxygen-sensors-behind-catalytic-converter-removing) .

20 - Engine Coolant Temperature (ECT) sensor -G62

1. For engine control module
2. On coolant line behind cylinder head, bank 1
3. With Engine Coolant Temperature (ECT) sensor -G2
4. Checking. Refer to «Engine Coolant Temperature (ECT) sensor -G62-, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__engine-coolant-temperature-ect-sensor-g62)

1. If necessary, release cooling system pressure before removal

21 - Throttle valve control module -J338

1. With Throttle drive (power accelerator actuation) -G186-, Angle sensor -1- for throttle drive (power accelerator actuation) -G187- and Angle sensor -2- for throttle drive (power accelerator actuation) -G188
2. Checking. Refer to «Throttle valve control module -J338-, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__throttle-valve-control-module-j338-checking)
3. Perform adaptation on replacing. Refer to «Throttle valve control module -J338-, adaptation»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__throttle-valve-control-module-j338-adaptation)

22 - Secondary Air Injection (AIR) solenoid valve -N112

1. Checking

Refer to 26 EXHAUST SYSTEM, EMISSION CONTROLS

23 - Engine speed (RPM) sensor -G28

1. In gear case above ring gear
2. Checking. Refer to «Engine speed (RPM) sensor -G28-, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__engine-speed-rpm-sensor-g28-checking)

24 - Bracket for connectors

1. For left side of vehicle
2. Assignment. (Scheme 496)

25 - Throttle Position (TP) sensor -G79- and Sender -2- for accelerator pedal position -G185

1. Location. (Scheme 491)
2. Checking. Refer to «Accelerator position sensor, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__accelerator-position-sensor-checking)
3. Adapting kick down function. Refer to «Kickdown function, adapting»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__kickdown-function-adapting)

26 - Fuel Pump (FP) relay -J17

1. Location. (Scheme 492)
2. Checking. Refer to «Fuel Pump (FP) relay -J17- and activation, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn)

27 - Brake light switch -F- and Brake pedal switch (cruise control/diesel direct fuel injection -F47

1. Location. (Scheme 493)
2. Checking. Refer to «Brake light switch and brake pedal switch, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__brake-light-switch-and-brake-pedal)

28 - Clutch vacuum vent valve switch -F36

1. Location. (Scheme 493)
2. Checking. Refer to «Clutch pedal switch check -F36-, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__clutch-pedal-switch-check-f36-checking)

29 - Instrument cluster

1. With exhaust Malfunction Indicator Lamp (MIL) -K83-. Notes on warning lamp. Refer to «Exhaust Malfunction Indicator Lamp (MIL) in instrument cluster»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__exhaust-malfunction-indicator-lamp-mil-in)
2. With Electronic Power Control (EPC) Warning Lamp -K132-. (check) Notes on EPC warning lamp. Refer to «Malfunction lamp for electronic throttle in instrument cluster»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__malfunction-lamp-for-electronic-throttle-in) .

30 - Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- and Oxygen Sensor (O2S) heater 2 -Z30

1. Bank 2, sensor 2
2. Check aging of oxygen sensors behind catalytic converter. Refer to «Oxygen sensors behind catalytic converter, checking aging»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__oxygen-sensors-behind-catalytic-converter-checking)
3. Check heating of oxygen sensors behind catalytic converter. Refer to «Oxygen sensors behind catalytic converter, checking heating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__oxygen-sensors-behind-catalytic-converter-checking)
4. Removing and installing. Refer to .

31 - Heated oxygen sensor (HO2S) 2 -G108- and Oxygen Sensor (O2S) 2 heater -Z28

1. Bank 2, sensor 1
2. Constant heated oxygen sensor (HO2S)
3. Check oxygen sensors and oxygen sensor control before catalytic converter. Refer to «Oxygen sensors and oxygen sensor control before catalytic converter, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__oxygen-sensors-and-oxygen-sensor-control)
4. Check aging of oxygen sensors before catalytic converter. Refer to «Oxygen sensors before catalytic converter, checking aging»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__oxygen-sensors-before-catalytic-converter-checking)

1. Check heating of oxygen sensors before catalytic converter. Refer to «Oxygen sensors before catalytic converter, checking heating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn)
2. Removing and installing. Refer to «Oxygen sensors before catalytic converter, removing and installing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__oxygen-sensors-before-catalytic-converter-removing) .

32 - Fuel pressure regulator

1. Checking for vehicles up to 06.03. Refer to «Fuel pressure regulator and holding pressure (vehicles up to 06.03), checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__fuel-pressure-regulator-and-holding-pressure)
2. Integrated in fuel filter for vehicles as of 07.03
3. Checking for vehicles as of 07.03. Refer to «System pressure and holding pressure (vehicles as of 07.03), checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__system-pressure-and-holding-pressure-vehicles)

33 - Knock Sensor (KS) 2 -G66

1. Bank 2
2. Under intake manifold

34 - Intake manifold change-over valve -N156

1. Location. (Scheme 499)
2. Checking. Refer to «Intake manifold change-over, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn)

35 - Knock Sensor (KS) 1 -G61

1. Cylinder bank 1
2. Under intake manifold

36 - Ground connection

1. Right hand side engine support

37 - Not installed

Scheme 491

1. Incorporated in accelerator pedal module (arrow)

Note. The Throttle Position (TP) sensor -G79- and Sender -2- for accelerator pedal position -G185- are incorporated in the accelerator pedal module and cannot be replaced separately.

Removing and installing gas pedal module

Refer to 20 - FUEL SUPPLY SYSTEM

Scheme 492

1. On relay carrier in driver's footwell (left side), relay position 1 (arrow)

Scheme 493

1 - Clutch Vacuum Vent Valve Switch -F36

2 - Brake light switch -F-, Brake Pedal Switch (cruise control/Diesel Direct Fuel Injection -F47

Removing and installing switches

Refer to

1. «30 CLUTCH»(/audi/a4/b6-2000-2006/remont/differentials-drive-axles/#5-speed-manual-transmission-01201w-front-wheel-drive) for 5 SPD. MANUAL TRANSMISSION 012/01W FRONT WHEEL DRIVE
2. «30 CLUTCH»(/audi/a4/b6-2000-2006/remont/differentials-drive-axles/#5-speed-manual-transmission-01a-all-wheel-drive-2) for 5 SPD. MANUAL TRANSMISSION 01A ALL WHEEL DRIVE
3. «30 CLUTCH»(/audi/a4/b6-2000-2006/remont/differentials-drive-axles/#6-speed-manual-transmission-01e-all-wheel-drive) for 6 SPD. MANUAL TRANSMISSION 01E ALL WHEEL DRIVE
4. «30 CLUTCH»(ref-278902-S08645519692008020700000) for 6-SPEED MANUAL TRANSMISSION 01X, FRONT-WHEEL DRIVE
5. «30 CLUTCH»(ref-278903-S21941806522008020700000) for 6-SPEED MANUAL TRANSMISSION 02X, FOUR-WHEEL DRIVE
6. «30 CLUTCH»(ref-278904-S05381615532008020700000) for 6-SPEED MANUAL TRANSMISSION 0A3, ALL WHEEL DRIVE

Refer to 46 - BRAKES - MECHANICAL COMPONENTS

Scheme 494

Locations in electronics box (plenum chamber).

1.1 - Coolant circulation pump relay -J151- (hot countries only)

1.2 - Not used

2 - Motronic Engine Control Module (ECM) power supply relay -J271

3 - Secondary Air Injection (AIR) pump relay -J299

A - Fuse S282 for engine electronics

B - Fuse S130 for secondary air pump

C - Not used

Scheme 495

1 - 6-pin connector, black

for Heated Oxygen Sensor (HO2S) -G39- and Oxygen Sensor (O2S) heater -Z19- (bank 1, sensor 1)

2 - 3-pin connector, blue

for Knock Sensor (KS) 1 -G61

3 - 4-pin connector, green

for Oxygen Sensor (O2S) 2 behind three way catalytic converter (TWC) -G130- and Oxygen Sensor (O2S) heater 1 -Z29- (bank 1, sensor 2)

4 - 3-pin connector, black

for terminal 50

Scheme 496

1 - 4-pin connector, brown

for Oxygen Sensor (O2S) 2 behind three way catalytic converter (TWC) -G131- and Oxygen Sensor (O2S) heater 2 -Z30- (bank 2, sensor 2)

2 - 3-pin connector, gray

for Engine speed (RPM) sensor -G28

3 - 3-pin connector, blue

for Knock Sensor (KS) 2 -G66

4 - 6-pin connector, black

for Heated Oxygen Sensor (HO2S) 2 -G108- and Oxygen Sensor (O2S) 2 heater -Z28- (bank 1, sensor 1)

Note. To gain access to the harness connectors, you must remove the cover on left side of engine compartment, disconnect cable to coolant shortage indicator switch at bottom of expansion tank, remove screw for coolant expansion tank (arrow) and lay aside. Coolant hoses -1 to 3- do not have to be disconnected.

Scheme 497

Scheme 498

1. Clipped to vacuum module

Scheme 499

1 - To/from Secondary Air Injection (AIR) pump motor -V101

2 - O-ring

1. Always replace

3 - Self-tapping screw

4 - Air duct

5 - Air duct

1. To lock carrier

6 - Spreader clip

7 - Seal

8 - Cover

9 - Mass Air Flow (MAF) sensor -G70

10 - Connecting hose

11 - Self-tapping screw

12 - Air cleaner housing, upper part

13 - Filter element

14 - Air cleaner housing, lower part

Scheme 500

1 - Intake manifold change-over valve -N156

2 - Y-piece

3 - Self-tapping screw

4 - Vacuum actuator

5 - Seals

1. For change-over mechanism
2. Replace, if damaged

6 - Spring

7 - Change-over mechanism

8 - Mounting plate

9 - Rubber grommet

10 - Spacer sleeve

11 - 10 Nm

12 - Secondary Air Injection (AIR) solenoid valve -N112

13 - Non-return valve

1. Installation position: Blue side facing Y-piece

14 - To secondary air inlet combi valves

15 - Y-piece

16 - To vacuum reservoir

17 - T-piece

18 - Intake manifold

Wiring and component check with test box VAG 1598/31

Note. The test box VAG1598/31 is designed in such a way to be connected simultaneously to the engine control module wiring harness and to the engine control module. This has the advantage that the electronic motor control system remains fully functional when the test box is connected (for example, for measuring signals when the engine is running). Whether the engine control module has to be connected to the test box or not is described in the respective test procedures.

1. Switch ignition off.
2. Remove engine control module. Refer to «Removing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__removing) .

Scheme 501

1. Connect VAG1598/31 test box to connectors of wiring harness. Connect Ground clamp on test box (not shown in illustration) to vehicle Ground. Whether or not engine control module has to be connected to test box is described in respective test procedures.

Note. After reinstalling the engine control module the following operations must be performed

1. Checking of Diagnostic Trouble Code (DTC) memory and erase, if necessary. Refer to «Diagnostic Trouble Code (DTC) memory, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__diagnostic-trouble-code-dtc-memory-checking) .
2. If DTC memory has been erased, readiness code must be regenerated. Refer to «Readiness code, generating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__readiness-code-generating) .

Procedure following interruption of voltage supply

Note. After reconnecting the voltage supply the following operations must be performed

1. Checking of Diagnostic Trouble Code (DTC) memory and erase, if necessary. Refer to «Diagnostic Trouble Code (DTC) memory, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__diagnostic-trouble-code-dtc-memory-checking) .
2. If DTC memory has been erased, readiness code must be regenerated. Refer to «Readiness code, generating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__readiness-code-generating) .

Procedure after voltage supply open circuit

The following steps need to be performed after reconnecting the power supply

1. Activate engine control module via "Guided fault finding" function (diagnosis object "Replacing engine control module").

For this step use vehicle diagnostic, testing and information system VAS5051.

Engine Control Module (ECM) (without metal anti-theft housing), replacing

Removing ECMs with metal anti-theft housing. Refer to Engine Control Module (ECM) (with metal anti-theft housing), replacing .

Removing

1. Connect vehicle diagnostic, test and information system VAS5051 and select vehicle system "01 - Engine electronics". Ignition must be on.

Scheme 502

The display on vehicle diagnostic, test and information system VAS5051 will show the control module identification and the coding -2-.

1. Always start by calling up and printing out control module identification.
2. Switch off ignition.

Scheme 503

1. Pull off rubber seal of plenum chamber cover.
2. Remove plenum chamber cover -1- toward front (arrows).

Scheme 504

1. Pry off cover caps -3- (2x) with a screwdriver.
2. Loosen hex nuts -4- several turns.
3. Disengage wiper arms -2- from their shafts by lifting them gently.
4. Remove hex nuts completely and take off wiper arms.

1. Pull off securing clips -1- and remove scuttle panel grille -5-.

Scheme 505

1. Remove cover for electronics box in plenum chamber (arrows).

Scheme 506

1. Pry off retainer bar with a screwdriver (arrows).

Scheme 507

1. Release retainer catches (arrows) and disconnect connectors -1- and -2- from engine control module.
2. Take out engine control module.

Installing

Install in reverse sequence; note the following points

The following steps need to be performed after connecting the new engine control module

1. Activate engine control module via "Guided fault finding" function (diagnosis object "Replacing engine control module").

For this step use vehicle diagnostic, testing and information system VAS5051.

Engine Control Module (ECM) (with metal anti-theft housing), replacing

Removing ECMs without metal anti-theft housing. Refer to Engine Control Module (ECM) (without metal anti-theft housing), replacing .

Removing

1. Connect VAS5051 tester and select vehicle system "01 - Engine Electronics". Ignition must be switched on for this.

VAS5051 tester display will indicate the control module identification and coding -2-.

1. Always allow display of control module identification first and print it out.
2. Switch ignition off.

1. Pull off plenum chamber cover rubber seal in direction of arrow.
2. Remove cover -1- toward front.

1. Pry off both covers -3- using a screwdriver.
2. Loosen hex-nuts -4- several turns.
3. Loosen wiper arm -2- by lightly tilting from wiper axle.
4. Remove hex nuts completely and remove wiper arms.

1. Disconnect securing clips -1- and remove cowl grill -5-.

1. Remove cover for E-box, plenum chamber (arrows).

Scheme 508

1. Using a screwdriver, carefully pry off retaining bracket (arrow).

Note. Item -1- in illustration shows Engine Control Module (ECM) with anti-theft housing.

Scheme 509

To restrict accessibility (for theft prevention) to the harness connectors and the Engine Control Module (ECM), the ECM -1- is screwed to a metal anti-theft housing -4- via a locking mechanism -2- and snap-off screws -3-.

The threads of the snap-off screws are coated with a locking compound to make it more difficult to remove the snap-off screws.

To disconnect the harness connectors from the Engine Control Module (ECM) (e.g. when connecting a test box or when replacing the ECM), the ECM must be removed from the metal anti-theft housing. This procedure is described as follows.

The following equipment is required

Scheme 510

1. Heat gun -1- (from VAS1978 Wiring Harness Repair Kit)
2. Adapter nozzle -2- (also from VAS1978 Wiring Harness Repair Kit)
3. Standard locking pliers

Procedure

1. "Fold" Engine Control Module (ECM) with anti-theft housing in direction of engine compartment so that locking mechanism (item -2- in illustration) becomes visible and place a clean rag below Engine Control Module (ECM) with anti-theft housing.

Scheme 511

1. Adjust heat gun as shown in illustration, i.e. temperature adjustment -2- to maximum heat output and two-stage switch for air mass -3- to position 3.

Note. Next, use a heat gun to heat the threads of the locking mechanism into which the snap-off screws are screwed into. This step loosens the locking compound on the threads of the snap-off screws for easier removal.

Scheme 512

1. Guide nozzle -1- of heat gun to locking mechanism threads so that nozzle "encloses" threads. It is OK to let nozzle make contact at upper end of metal anti-theft housing.
2. Switch on heat gun and heat up threads for approx. 20 to 25 seconds.

Scheme 513

1. Next, using locking pliers -1-, grab screw head -2- and remove snap-off screw by turning in direction of arrow.

Procedure for the second snap-off screw is exactly the same. Be very careful since the control module connector is in close proximity.

Scheme 514

1. Guide nozzle -1- of heat gun to locking mechanism threads again so that nozzle "encloses" threads. It is OK to let nozzle make contact at upper end of metal anti-theft housing.
2. Switch on heat gun and heat up threads for approx. 20 to 25 seconds.

Scheme 515

1. Next, using locking pliers -1-, grab screw head -2- and remove snap-off screw by turning in direction of arrow.

The Engine Control Module (ECM) can now be removed from the metal anti-theft housing.

1. Disengage connectors from Engine Control Module (ECM) and disconnect connectors.
2. Remove old Engine Control Module (ECM) and insert new one.

Installing Engine Control Module (ECM)

Installation is reverse of removal, noting the following

After repairs are complete, the metal anti-theft housing must be reinstalled. Use new snap-off screws.

After connecting a new Engine Control Module (ECM), the following work steps must be performed

1. Activate Engine Control Module (ECM) in "Guided Troubleshooting" below subject heading "Engine Control Module (ECM), replacing".

Use VAS5051 tester to do so.

Idling speed, checking

Special tools and equipment

Scheme 516

1. VAS5051 with VAS5051/1

Test requirements

1. No leaks in exhaust system
2. Engine coolant temperature at least 80°C.
3. Electrical accessories switched off (coolant fan must not run during the test).
4. Air conditioning switched off.

1. Pressure gauge not connected.
2. Vehicles with automatic transmission: Selector lever in position P or N.

Note. The idling speed is tested during the basic setting of the engine. During basic setting, the solenoid valve for the evaporative emission (EVAP) canister purge regulator valve -N80- is closed and the air conditioner compressor is switched off. To eliminate vibration noises in case of a customer complaint, the idling speed can be adapted. Refer to Adaptation .

Test sequence

1. Connect testing and information system VAS5051. Refer to «Vehicle diagnostic, testing and information system VAS5051, connecting and select functions»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__vehicle-diagnostic-testing-and-information-system) and select vehicle system "01 - Engine electronics" in selection. Engine must be running at idling speed.
2. Check Diagnostic Trouble Code (DTC) memory. Refer to «Diagnostic Trouble Code (DTC) memory, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__diagnostic-trouble-code-dtc-memory-checking) . There must not be any DTCs stored. If necessary, correct any DTCs and erase DTC memory. After erasing DTC memory readiness code must be regenerated. Refer to «Readiness code, generating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__readiness-code-generating) .
3. Leave engine idling.

Display on VAS5051

1. Under -1- select diagnostic function "04 - Basic setting".

Display on VAS5051

1 - Enter display group max. input value = 255

1. Enter "056" for "display group number 056" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

1. Activate basic setting by pressing -A- button.
2. Check whether engine speed in display zone -1- (actual speed) is within permitted tolerance range.

All models

Note. The engine speed in display zone 1 (actual speed) is the actual engine speed. The engine speed in display zone 2 (specified speed) is a theoretical value calculated by the engine control module. During idling, the engine control module always tries to adapt the actual engine speed to the specified engine speed. This means that during idling the actual engine speed must always be approximate to the specified engine speed. Display zones 3 and 4 are there for information but are irrelevant to the control of the engine idling speed.

1. Exit function "04 - Basic setting" by pressing <-- button.

If specified value is not obtained

1. Check Diagnostic Trouble Code (DTC) memory again. Refer to «Diagnostic Trouble Code (DTC) memory, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__diagnostic-trouble-code-dtc-memory-checking) .
2. If DTC memory was erased, readiness code must be re-generated. Refer to «Readiness code, generating»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__readiness-code-generating) .

If the idling speed is too high or too low and there are no DTCs recorded in the DTC memory, perform the following tests marked with a dot

1. Check intake air system for unmetered air. Refer to «Intake air system for leaks (unmetered air), checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__intake-air-system-for-leaks-unmetered) .
2. Check throttle valve control module. Refer to «Throttle valve control module -J338-, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__throttle-valve-control-module-j338-checking) .
3. Check whether solenoid valve for Evaporative Emission (EVAP) canister purge regulator valve is continuously open. Refer to «Evaporative Emission (EVAP) canister purge regulator valve -N80-, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__evaporative-emission-evap-canister-purge-regulator) .
4. Perform adaptation of throttle valve control module. Refer to «Throttle valve control module -J338-, adaptation»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__throttle-valve-control-module-j338-adaptation) .

Significance of 5-digit readout of display group 056

Fuel pressure regulator and holding pressure (vehicles up to 06.03), checking

Note. The fuel pressure regulator regulates the fuel pressure according to the intake manifold pressure. The pressure drop at the injectors remains constant for each engine speed and load range.

Special tools and equipment

Scheme 517

1. VAG1318 with VAG1318/6 and VAG1318/7

Test requirements

1. Fuel pump relay OK; checking. Refer to «Fuel Pump (FP) relay -J17- and activation, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .
2. Fuel pump OK; checking

Refer to 20 - FUEL SUPPLY SYSTEM

1. Fuel filter OK
2. Battery voltage at least 12.7 V
3. Vehicles with automatic transmission: Selector lever in position P or N.

Test sequence

Scheme 518

1. Remove rear engine cover (arrows).

Checking system pressure

1. Briefly open fuel tank filler cap (to release pressure).

Scheme 519

1. Connect pressure gauge VAG1318 to fuel supply line using adapters 1318/6 and 1318/7.
2. Disconnect vacuum hose from pressure regulator to intake manifold at pressure regulator and close off hose.

Note. If fuel flows at the vacuum connection on the pressure regulator during the following pressure test, replace pressure regulator.

1. Start engine and run at idling speed.
2. Measure fuel pressure.

1. Specified value: 3.8 to 4.2 bar

1. If fuel pressure does not match specification, install a new fuel pressure regulator and repeat pressure test.
2. If fuel pressure still does not match specification, check fuel pump and supply line for damage (e.g. crushing) and replace if necessary.
3. If pressure is higher than specification, check return line for damage (e.g. crushing) and replace, if necessary.

Note. During the following test, do not leave the engine running too long with the vacuum hose disconnected, because the higher fuel pressure causes the fuel and air mixture to be rich. This could lead to the Oxygen sensor control limits to be exceeded. This would result in a DTC being recorded.

1. Start engine and run at idling speed.
2. Switch off electrical accessories (air conditioner, etc.).
3. Re-connect vacuum hose to pressure regulator and observe drop in pressure on pressure gauge.
4. Fuel pressure must be lowered by approx. 0.5 bar when vacuum hose is attached.

Perform the following checks if there is no change in pressure as described above

1. Check vacuum hose for cracks and damage.
2. Test vacuum hose for blockage at intake manifold. To do this, disconnect hose at fuel pressure regulator and blow into it.

1. If there is no leak and no blockage in vacuum hose, install a new fuel pressure regulator.

Testing holding pressure

1. Holding pressure 10 minutes after switching off engine (minimum pressure).

1. Specified value for cold engine: approx. 2.2 bar
2. Specified value with engine at operating temperature: approx. 3.0 bar

Note. The increase in temperature with the engine at operating temperature is caused by the expansion of the fuel is normal.

1. Start engine and run at idling speed.

Scheme 520

1. Allow pressure to build up, then switch off ignition. At same time close cut off valve on pressure gauge VAG1318 (valve lever at right angles to direction of flow (arrow)).
2. Observe pressure drop on pressure gauge.

If the pressure does not drop, the following DTCs are possible

1. Union between pressure gauge and fuel supply line leaking
2. Supply line leaking at fuel tank
3. Non-return valve in fuel pump leaking

Refer to 20 - FUEL SUPPLY SYSTEM

Note. When the shut off valve is closed the pressure gauge shows the pressure after the isolating valve "intake manifold end" (direction of injectors, fuel pressure regulator). If the pressure before the isolating valve (tank direction) should now fall, the equipment cannot recognize this.

If the pressure drops again, the following DTCs are possible

1. Fuel pressure regulator malfunction
2. Injectors leaking
3. Unions on pressure gauge after cut-off valve leaking

Note. When disconnecting the pressure gauge, close the shut-off valve, unscrew the union on adapter VAG1318/15, then open the shut-off valve to drain off excess fuel into a suitable container.

System pressure and holding pressure (vehicles as of 07.03), checking

Note. Fuel pressure regulator is integrated in fuel filter (under fuel tank) and cannot be replaced individually.

Recommended special tools and equipment

1. Fuel Inj. Pressure Gauge-CIS V.A.G 1318 with adapters V.A.G 1318/6 and V.A.G 1318/7

Test requirements

1. Fuel Pump (FP) Relay OK; checking. Refer to «Fuel Pump (FP) relay -J17- and activation, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .
2. Delivery quantity of transfer Fuel Pump (FP) OK

Refer to 20 - FUEL SUPPLY SYSTEM

1. Fuel filter OK
2. Vehicles with automatic transmission: Selector lever in position "P" or "N".
3. Battery voltage at least 12.7 V

Test sequence

1. Remove rear engine cover (arrows).

Checking system pressure

1. Open fuel filler cap briefly (pressure release).

Scheme 521

1. Unscrew fuel hose from connection on fuel rail pipe. To do so, counterhold using an open-end wrench at each hex head -1- and -3- and unscrew union nut -2-.

1. Connect V.A.G 1318 Fuel Inj. Pressure Gauge-CIS in supply line using adapters 1318/6 and 1318/7.

Scheme 522

1. Open shut-off valve of pressure gauge. The lever points in the direction of flow.
2. Start engine and let run at idle.
3. Measure fuel pressure.

1. Specified value: 3.8 to 4.2 bar

1. Switch ignition off.

Checking holding pressure

1. Check for proper seal and residual pressure by observing pressure drop on pressure gauge.

1. Specified value with a cold engine: approx. 2.2 bar
2. Specified value with the engine at operating temperature: approx. 3.0 bar

Note. Pressure increase for an engine at operating temperature due to fuel expansion is normal.

If holding pressure sinks below 2.2/3.0 bar positive pressure

1. Start engine and let run at idle.

1. Wait until pressure has built up, and then switch off ignition. Simultaneously close shut-off valve of V.A.G 1318 Fuel Inj. Pressure Gauge-CIS (lever perpendicular to direction of flow -arrow-).
2. Observe pressure drop on pressure gauge.

If pressure drops again

1. Check pressure gauge for proper seal.
2. Check line connections and fuel injectors for proper seal.

If pressure does not drop now

1. Check pressure regulator in fuel filter

1. Vehicles with Front Wheel Drive (FWD). Refer to «Checking fuel pressure regulator - vehicles with Front Wheel Drive (FWD)»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__checking-fuel-pressure-regulator-vehicles)
2. Vehicles with All Wheel Drive (AWD). Refer to «Checking fuel pressure regulator - vehicles with All Wheel Drive (AWD)»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__checking-fuel-pressure-regulator-vehicles)

Checking fuel pressure regulator - vehicles with Front Wheel Drive (FWD)

Sedan

1. Remove luggage compartment lining.
2. Push forward the right backrest of rear seat, if necessary.

Station wagon

1. Remove left 1/3 backrest.

Refer to

1. «72 - SEAT - FRAMES»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior)
2. «72 - SEAT - FRAMES»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior-cabriolet) for BODY INTERIOR - CABRIOLET

1. Remove left side trim in luggage compartment and dirt tray.

Refer to

1. «70 - INTERIOR TRIM»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior)
2. «70 - INTERIOR TRIM»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior-cabriolet) for BODY INTERIOR - CABRIOLET

All

Scheme 523

1. Remove cover for connector flange (arrows).

Scheme 524

1. Disconnect fuel return line (arrow) (press release button).

Scheme 525

1. Connect V.A.G 1318/17-1 adapter piece to return line.
2. Pinch off adapter piece using 3094 hose clamps up to 25 mm dia.

Note. 3094 hose clamps up to 25 mm dia. must not be placed directly on fuel line, otherwise it may be damaged.

1. Start engine and let run at idle.

1. Wait until pressure has built-up, and then switch off ignition. Simultaneously close shut-off valve of V.A.G 1318 Fuel Inj. Pressure Gauge-CIS (lever perpendicular to direction of flow -arrow-).
2. Observe pressure drop on pressure gauge.

If pressure drops again, check-valve of fuel pump is leaky.

1. Replace Fuel Pump (FP).

Refer to 20 - FUEL SUPPLY SYSTEM

If pressure does not drop now

1. Replace fuel filter with integrated fuel pressure regulator.

Assembly is performed in the reverse order of removal, noting the following

Note. Before disconnecting pressure gauge, release pressure by opening shut-off valve. Hold a container in front of connection for this.

1. Secure fuel hose to connection on fuel rail pipe. To do so, counterhold using an open-end wrench at each hex head -1- and -3- and tighten union nut -2- to 22 Nm.

Checking fuel pressure regulator - vehicles with All Wheel Drive (AWD)

1. Remove rear seat bench.

Refer to

1. «72 - SEAT - FRAMES»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior)
2. «72 - SEAT - FRAMES»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior-cabriolet) for BODY INTERIOR - CABRIOLET

Scheme 526

1. Remove cover for left connector flange (arrows).

Scheme 527

1. Disconnect fuel return line (arrow) from connector flange (left side of vehicle).

Scheme 528

1. Connect V.A.G 1318/17-1 adapter piece to return line.
2. Pinch off adapter piece using 3094 hose clamps up to 25 mm dia.

Note. 3094 hose clamps up to 25 mm dia. must not be placed directly on fuel line, otherwise it may be damaged.

1. Start engine and let run at idle.

1. Wait until pressure has built-up, and then switch off ignition. Simultaneously close shut-off valve of V.A.G 1318 Fuel Inj. Pressure Gauge-CIS (lever perpendicular to direction of flow -arrow-).
2. Observe pressure drop on pressure gauge.

If pressure drops again, check-valve of fuel pump is leaky.

1. Replace Fuel Pump (FP).

Refer to 20 - FUEL SUPPLY SYSTEM

If pressure does not drop now

1. Replace fuel filter with integrated fuel pressure regulator.

Assembly is performed in the reverse order of removal, noting the following

Note. Before disconnecting pressure gauge, release pressure by opening shut-off valve. Hold a container in front of connection for this.

1. Secure fuel hose to connection on fuel rail pipe. To do so, counterhold using an open-end wrench at each hex head -1- and -3- and tighten union nut -2- to 22 Nm.

Scheme 529

Special tools and equipment

1. VAG1526 A
2. VAG1527 B
3. VAG1594 A
4. VAG1598/31

Procedure

Cylinder bank 2 (left)

Scheme 530

1. Remove front engine cover (arrows).

Scheme 531

1. Disconnect connectors to Intake manifold change-over valve -N156- -1-.

Both cylinder banks, continued

Scheme 532

1. Disconnect all connectors for injectors of relevant cylinder bank, release connectors underneath for this purpose (arrow).

Checking internal resistance

Scheme 533

1. Connect multimeter to injector to measure resistance.

1. Specified value: 11 to 13 ohms (at room temperature)

When the engine is at operating temperature the resistance is increased by approx. 4 to 6 ohms.

If specified value is not obtained

1. Replace injector. Refer to «Fuel injectors, removing and installing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn)

If specified value is obtained

Checking power supply

Test requirements

1. Fuse for injectors OK

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

1. Fuel pump relay OK; checking. Refer to «Fuel Pump (FP) relay -J17- and activation, checking»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .

Note. The injectors receive their power supply via the fuel pump relay.

1. Connect voltage tester VAG1527 B as follows

1. Switch ignition on.

1. LED should illuminate.

If the LED does not illuminate

1. Check wiring connection between terminal 1 and fuse for injector for open circuit

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

1. Repair open circuit, if necessary.

If the LED illuminates

Checking actuation

Test requirements

1. Internal resistance of the valve OK

Scheme 534

1. Connect voltage tester VAG1527 B with measuring probes and plug-in adapters from VAG1594 A between terminal 2 (signal) and terminal 1 (positive); connector remains plugged in.
2. Operate starter briefly (engine may start).

1. LED should flash.

Note. Voltage testers with a low current draw continue to glow faintly between actuation from the engine control module (rather than extinguishing completely) and become slightly brighter when actuated.

If LED does not flash

1. Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. Refer to «Wiring and component check with test box VAG 1598/31»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__wiring-and-component-check-with-test) .

1. Check for open circuit and short to positive or Ground in following wiring connections

1. Repair any open/short circuit as necessary.

If no wiring malfunction is detected

1. Replace engine control module. Refer to «Engine Control Module (ECM) (without metal anti-theft housing), replacing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn__engine-control-module-ecm-without-metal) .

Scheme 535

1 - Retaining clip

1. Make sure clip is positioned correctly at injector and fuel rail

2 - O-ring

1. Removing and installing. Refer to «Fuel injectors, removing and installing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .
2. Always replace
3. Coat with clean engine oil.

3 - Injector

1. Removing and installing. Refer to «Fuel injectors, removing and installing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .

4 - O-ring

1. Removing and installing. Refer to «Fuel injectors, removing and installing»(/audi/a4/b6-2000-2006/remont/cooling-fan/#30l-6-cyl-5v-engine-controls-fuel-injection-ignition-engine-codes-avk-bgn) .
2. Always replace
3. Coat with clean engine oil.

5 - Fuel return line

1. Only in vehicles up to 06.03

6 - Fuel supply line

1. For vehicles up to 06.03, tighten union nut to 22 Nm
2. Loosening and tightening union in vehicles as of 07.03. (Scheme 536)

7 - 10 Nm

8 - Fuel rail

9 - 10 Nm

10 - Retaining clip

1. Make sure tight fit

11 - O-rings

1. Always replace
2. Moisten with clean engine oil.

12 - Fuel pressure regulator

1. Integrated in fuel filter in vehicles as of 07.03

13 - Vacuum hose

Loosening and tightening union nut for fuel supply line in vehicles as of 07.03

Loosening

1. Unscrew fuel hose from connection on fuel rail pipe. To do so, counterhold using an open-end wrench at each hex head -1- and -3- and unscrew union nut -2-.

Tightening

1. Secure fuel hose to connection on fuel rail pipe. To do so, counterhold using an open-end wrench at each hex head -1- and -3- and tighten union nut -2- to 22 Nm.

1. Disconnect battery Ground cable.

Refer to

1. «27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL»(/audi/a4/b6-2000-2006/remont/cruise-control-systems/#electrical-equipment)
2. «27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL»(ref-278931-S05223151852008020700000) for ELECTRICAL EQUIPMENT, CABRIOLET

1. Remove rear engine cover (arrows).
2. Disconnect check valve hose.

Scheme 536

1. Remove bolts for retainer plate for solenoid valve (arrows).
2. Lift up retainer plate and move it toward rear of engine.

1. Remove front engine cover (arrows).

1. Disconnect harness connectors to Intake manifold change-over valve -N156- -1-.

1. Gently lift up fuel rail and disconnect all harness connectors at fuel injectors. Disengage harness connectors underneath (arrow).

Vehicles up to 06.03

Scheme 537

1. Disconnect vacuum hose -3- from fuel pressure regulator.

Note. To install a new fuel rail disconnect the fuel supply line -2- and return line -1-.

All

1. Unbolt fuel rail from intake manifold (arrows).

Vehicles as of 07.03

To replace the fuel rail pipe, fuel hose must be unscrewed from connection on fuel rail pipe. To do so, counterhold using an open-end wrench at each hex head -1- and -3- and unscrew union nut -2- (tightening torque 22 Nm).