Multiport Fuel Injection (mfi) - 1.8l 5v Turbo, Amb Audi A4 B7

Safety precautions

If special testing equipment is required during test drive, observe the following

Rules for cleanliness

When working on the fuel supply or fuel injection systems, the following "6 rules of cleanliness" should be carefully observed

1. Thoroughly clean all connections and the surrounding area before disconnecting.
2. Place parts that have been removed on a clean surface and cover. Use lint-free cloths only!
3. Carefully cover opened components or seal them if repairs are not carried out immediately.
4. Only install clean components: Only unpack replacement parts immediately prior to installation. Do not use parts that have been stored loose (in tool boxes etc.).
5. When the system is open: Do not work with compressed air if it can be avoided. Do not move vehicle unless absolutely necessary.
6. Disconnected electrical harness connectors: Protect from dirt and moisture. Be sure harness connector is dry before connecting.

Technical data

ENGINE TECHNICAL DATA

Component locations, overview

Components A to F are not shown in the exploded view.

1. Brake Light Switch -F- and Brake Vacuum Vent Valve Switch -F47- In footwell on pedal bracket near brake pedal
2. Data Link Connector (DLC) In knee protection on driver's side
3. Fuel Pump (FP) Relay -J17- In the micro-central electrics behind storage compartment on driver's side, relay position 4 Installation location. See «Location of Fuel Pump (FP) Relay -J17»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__location-of-fuel-pump-fp-relay) .
4. Clutch Vacuum Vent Valve Switch -F36- In footwell on pedal bracket near brake pedal
5. Throttle Position (TP) Sensor -G79- and Throttle Position Sensor -G185- In footwell on accelerator pedal (both sensors are located in one housing)
6. Electronic Power Control (EPC) Warning Lamp -K132- In instrument cluster With Electronic Power Control (EPC) Warning Lamp -K132-. Notes for EPC Warning Lamp. Go to «ELECTRONIC POWER CONTROL (EPC) WARNING LAMP -K132- IN INSTRUMENT CLUSTER»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electronic-power-control-epc-warning-lamp) . With exhaust Malfunction Indicator Lamp (MIL). Notes for Malfunction Indicator Lamp (MIL). See «MALFUNCTION INDICATOR LAMP (MIL) -K83- IN INSTRUMENT CLUSTER»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb__malfunction-indicator-lamp-mil-k83-in) .

Note. The following list refers to (Scheme 1).

1. Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- Checking. Go to «FUEL TANK VENTILATION SYSTEM, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .
2. Heated Oxygen Sensor (HO2S) -G39- 55 Nm Constant oxygen sensor Check Oxygen Sensor (O2S) and oxygen sensor control before Three Way Catalytic Converter (TWC). Go to «OXYGEN SENSOR SYSTEM»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) . Check oxygen sensor aging of oxygen sensor before catalytic converter. Go to «OXYGEN SENSOR (O2S) BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) . Check oxygen sensor heating for Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC). Go to «OXYGEN SENSOR (O2S) HEATING -Z19- FOR OXYGEN SENSOR BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) . Removing and installing. Go to «OXYGEN SENSOR (O2S), REMOVING AND INSTALLING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .
3. Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- 55 Nm Check Oxygen Sensor (O2S) and oxygen sensor control behind Three Way Catalytic Converter (TWC). Go to «OXYGEN SENSOR (O2S) AND OXYGEN SENSOR CONTROL BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__oxygen-sensor-o2s-and-oxygen-sensor) . Check oxygen sensor heater for Oxygen Sensor (O2S) behind Three Way Catalytic Converter (TWC). Go to «OXYGEN SENSOR (O2S) HEATING -Z29- FOR OXYGEN SENSOR AFTER THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) . Removing and installing. Go to «OXYGEN SENSOR (O2S), REMOVING AND INSTALLING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .
4. Combi valve for secondary air inlet Checking, removing and installing: See «SECONDARY AIR COMBINATION VALVE, REMOVING AND INSTALLING»(/audi/a4/b7-2004-2009/remont/blowers-superchargers-turbochargers/#engine-controls-turbocharger-exhaust-system-emission-controls-18l-5v-turbo-amb) .
5. Engine Coolant Temperature (ECT) Sensor -G62- Checking. See «ENGINE COOLANT TEMPERATURE (ECT) SENSOR -G62-, CHECKING»(/audi/a4/b7-2004-2009/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb__engine-coolant-temperature-ect-sensor-g62) . If necessary, release pressure of cooling system before removing
6. Engine Speed (RPM) Sensor -G28- Checking. See «ENGINE SPEED (RPM) SENSOR -G28-, CHECKING»(/audi/a4/b7-2004-2009/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb__engine-speed-rpm-sensor-g28-checking) .
7. Secondary Air Injection (AIR) Solenoid Valve -N112- Location. See «Location of Secondary Air Injection (AIR) Solenoid Valve -N112- and Recirculating valve for turbocharger -N249»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__location-of-secondary-air-injection-air) . Checking: See «SECONDARY AIR INJECTION (AIR) SOLENOID VALVE -N112-, CHECKING»(/audi/a4/b7-2004-2009/remont/blowers-superchargers-turbochargers/#engine-controls-turbocharger-exhaust-system-emission-controls-18l-5v-turbo-amb) . Connector green
8. Bracket for connectors Location. See «Location»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__location) . Accessible with coolant expansion tank removed and moved to side
9. Bracket for connectors Location. See «Location»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__location) . Accessible with coolant expansion tank removed and moved to side
10. Electronics box (plenum chamber) Location for Motronic Engine Control Module (ECM) -J220- with Barometric Pressure (BARO) Sensor -F96- Location for Motronic Engine Control Module (ECM) Power Supply Relay -J271- Installation locations. See «Location of Engine Control Module (ECM) in electronics box (plenum chamber)»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__location-of-engine-control-module-ecm) and «Component locations in electronics box (plenum chamber)»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__component-locations-in-electronics-box-plenum) . Check voltage supply of Engine Control Module (ECM). Go to «MOTRONIC ENGINE CONTROL MODULE (ECM) POWER SUPPLY, CHECKING»(/audi/a4/b7-2004-2009/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb) . Procedure to follow after open circuit in voltage supply. Go to «PROCEDURE AFTER INTERRUPTION OF VOLTAGE SUPPLY»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__procedure-after-interruption-of-voltage-supply) . Replacing Engine Control Module (ECM). Go to «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__engine-control-module-ecm-without-metal) . Component location for Engine Electronics Fuse -S282- for Motronic
11. Electronics box (plenum chamber) Location for Secondary Air Injection (AIR) Pump Relay -J299- Check Secondary Air Injection (AIR) Pump Relay -J299-: See «SECONDARY AIR INJECTION (AIR) PUMP RELAY -J299- AND SECONDARY AIR INJECTION (AIR) PUMP MOTOR -V101-, CHECKING»(/audi/a4/b7-2004-2009/remont/blowers-superchargers-turbochargers/#engine-controls-turbocharger-exhaust-system-emission-controls-18l-5v-turbo-amb) .
12. Charge Air Pressure Sensor -G31- Location: Charge Air Pressure Sensor -G31- is installed into top of charge air cooler Checking: See «CHARGE AIR PRESSURE SENSOR -G31-, CHECKING»(/audi/a4/b7-2004-2009/remont/blowers-superchargers-turbochargers/#engine-controls-turbocharger-exhaust-system-emission-controls-18l-5v-turbo-amb) .
13. Throttle Valve Control Module -J338- With Throttle drive (power accelerator activation) -G186-, Angle sensor -1- for throttle drive (power accelerator activation) -G187- and Angle sensor -2- for throttle drive (power accelerator activation) -G188- Checking. Go to «THROTTLE VALVE CONTROL MODULE -J338-, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__throttle-valve-control-module-j338-checking) . When replacing, perform adaptation. Go to «THROTTLE VALVE CONTROL MODULE -J338-, ADAPTING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__throttle-valve-control-module-j338-adapting) .
14. Intake Air Temperature (IAT) Sensor -G42- Checking. Go to «INTAKE AIR TEMPERATURE (IAT) SENSOR -G42-, CHECKING»(/audi/a4/b7-2004-2009/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb__intake-air-temperature-iat-sensor-g42) .
15. Recirculating valve for turbocharger -N249- Location. See «Location of Secondary Air Injection (AIR) Solenoid Valve -N112- and Recirculating valve for turbocharger -N249»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__location-of-secondary-air-injection-air) . Checking: See «RECIRCULATION VALVE FOR TURBOCHARGER -N249-, CHECKING»(/audi/a4/b7-2004-2009/remont/blowers-superchargers-turbochargers/#engine-controls-turbocharger-exhaust-system-emission-controls-18l-5v-turbo-amb) .
16. Knock Sensor (KS) 1 -G61
17. Knock Sensor (KS) 2 -G66
18. Camshaft Position (CMP) Sensor -G40- Checking. See «CAMSHAFT POSITION (CMP) SENSOR -G40-, CHECKING»(/audi/a4/b7-2004-2009/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb__camshaft-position-cmp-sensor-g40-checking) .
19. Fuel Injectors Cylinder 1 Fuel Injector -N30- Cylinder 2 Fuel Injector -N31- Cylinder 3 Fuel Injector -N32- Cylinder 4 Fuel Injector -N33- Checking. See «FUEL INJECTORS, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) . Removing and installing. Go to «FUEL INJECTORS, REMOVING AND INSTALLING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .
20. Ignition Coils Ignition Coil 1 with Power Output Stage -N70- Ignition Coil 2 with Power Output Stage -N127- Ignition Coil 3 with Power Output Stage -N291- Ignition Coil 4 with Power Output Stage -N292- Checking. See «IGNITION COILS WITH POWER OUTPUT STAGES, CHECKING»(/audi/a4/b7-2004-2009/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb) .
21. Wastegate Bypass Regulator Valve -N75- Checking: See «WASTEGATE BYPASS REGULATOR VALVE -N75-, CHECKING»(/audi/a4/b7-2004-2009/remont/blowers-superchargers-turbochargers/#engine-controls-turbocharger-exhaust-system-emission-controls-18l-5v-turbo-amb) .
22. Mass Air Flow (MAF) Sensor -G70- Checking. Go to «MASS AIR FLOW (MAF) SENSOR -G70-, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__mass-air-flow-maf-sensor-g70) .
23. Secondary Air Injection (AIR) Pump Motor -V101- Checking: See «SECONDARY AIR INJECTION (AIR) PUMP RELAY -J299- AND SECONDARY AIR INJECTION (AIR) PUMP MOTOR -V101-, CHECKING»(/audi/a4/b7-2004-2009/remont/blowers-superchargers-turbochargers/#engine-controls-turbocharger-exhaust-system-emission-controls-18l-5v-turbo-amb) .

Location

The following connections are located underneath the coolant expansion tank

1. 1 - 3-pin connector, blue For Knock Sensor (KS) 2 -G66
2. 1 - 4-pin connector, brown For Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- and Oxygen Sensor (O2S) Heater 1 -Z29- (bank 1, sensor 2)
3. 3 - 3-pin connector, grey For Engine Speed (RPM) Sensor -G28
4. 4 - 3-pin connector, green For Knock Sensor (KS) 1 -G61
5. 5 - 6-pin connector, black For Oxygen Sensor (O2S) -G39- and Oxygen Sensor (O2S) Heater -Z19- (bank 1, sensor 1)

Location of Fuel Pump (FP) Relay -J17

1. on the 9-unit relay carrier in driver's footwell, left, position 1

Scheme 1

Checking Fuel Pump (FP) Relay -J17-. See FUEL PUMP (FP) RELAY -J17- AND RELAY ACTIVATION, CHECKING .

Location of Brake Light Switch -F- and Brake Vacuum Vent Valve Switch -F47-, Clutch Vacuum Vent Valve Switch -F36

1. Brake Light Switch -F-, Brake Vacuum Vent Valve Switch -F47
2. Clutch Vacuum Vent Valve Switch -F36

Location of Throttle Position (TP) Sensor 1 -G79- and Throttle Position (TP) Sensor 2 -G185

1. Both the Throttle Position (TP) Sensor 1 -G79- and the Throttle Position (TP) Sensor 2 -G185- are stored in one housing.

Scheme 2

Location of Engine Control Module (ECM) in electronics box (plenum chamber)

Replacing Engine Control Module (ECM) (without metal anti-theft housing). See ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING .

Replacing Engine Control Module (ECM) (with metal anti-theft housing). See ENGINE CONTROL MODULE (ECM) (WITH METAL ANTI-THEFT HOUSING), REPLACING .

Scheme 3

Component locations in electronics box (plenum chamber)

1. 1.1 - Not used
2. 1.2 - Not used
3. 2 - Motronic Engine Control Module (ECM) Power Supply Relay -J271
4. 3 - Secondary Air Injection (AIR) Pump Relay -J299
5. 4 - Not used

1. Fuse S282 for engine electronics
2. Fuse S130 for secondary air pump
3. Not used

Scheme 4

Location of Secondary Air Injection (AIR) Solenoid Valve -N112- and Recirculating valve for turbocharger -N249

1. Location: underneath intake line

1. Secondary Air Injection (AIR) Solenoid Valve -N112
2. Recirculating valve for turbocharger -N249

Note. (Scheme 8) shows bottom view of intake line.

Scheme 5

Location of Charge Air Pressure Sensor -G31

Charge Air Pressure Sensor -G31- -arrow- screwed into top of charge air cooler.

Scheme 6

Electrical testing using VAG1598/31 test box

Note. If the Engine Control Module (ECM) is equipped with a metal anti-theft housing (for theft prevention), the metal anti-theft housing must be removed from the ECM to connect the test box. Procedure. Go to ENGINE CONTROL MODULE (ECM) (WITH METAL ANTI-THEFT HOUSING), REPLACING . After repairs are complete, the metal anti-theft housing must be reinstalled. The test box VAG 1598/31 is designed in such a way that it can be connected simultaneously to the Engine Control Module wiring harness and to the Engine Control Module itself. This has the advantage that the electronic engine control system remains fully functional when the test box is connected (for example, for measuring signals when the engine is running). Relevant test procedures note if Engine Control Module (ECM) should also be connected to the test box or not. Always use VAG1594A connector test kit to attach measurement devices (e.g. VAG1527B voltage tester, VAG1526 multimeter etc.).

Procedure

1. Switch ignition off.
2. Remove Engine Control Module (ECM). Go to «ENGINE CONTROL MODULE (ECM) (WITH METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__engine-control-module-ecm-with-metal) .
3. Connect VAG1598/31 test box to connector of wiring harness. Ground (GND) clip at test box must be clipped to battery Ground. Connect VAG 1598/31 test box to connectors of wiring harness.
4. Relevant test procedures note if Engine Control Module (ECM) should also be connected to test box.
5. Perform test as described in appropriate repair procedures.

Note. Important notes after re-connecting Engine Control Module (ECM): Check DTC memory and erase, if necessary. See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING . Generate readiness code. Go to READINESS CODE, GENERATING .

Procedure after interruption of voltage supply

Note. After reconnecting the voltage supply the following operations must be performed: Check DTC memory and erase, if necessary. Go to DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING . The readiness code must be generated if the DTC memory has been erased. See READINESS CODE, GENERATING .

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

Removing ECMs with metal anti-theft housing. Go to ENGINE CONTROL MODULE (ECM) (WITH METAL ANTI-THEFT HOUSING), REPLACING .

Note. When the Engine Control Module is disconnected, the learned values are erased but the contents of the DTC memory remain intact.

Removing Engine Control Module

1. Connect vehicle diagnostic, testing and information system VAS 5051 and select control module for engine electronics using "Address word" 01. For this purpose, the ignition must be switched on.
2. Always start by displaying and printing out control module identification.
3. Switch ignition off.
4. Remove rubber seal -1- from plenum chamber cover toward front.
5. Take out plenum chamber cover.
6. Remove both wiper blade arms -2- (mark position).
7. Unclip trim (see -arrows-).
8. Remove protective housing for control modules.
9. Carefully pry off retainer bar with a screwdriver -arrow-.
10. Release connector fixings -arrows- and disconnect control module connectors -1- and -2-.
11. Remove old Engine Control Module and install new Engine Control Module.

Installing Engine Control Module

Installation is performed in the reverse sequence.

The following operations must be carried out after installing the Engine Control Module

1. Perform encoding of new Engine Control Module. See «ENCODING II ENGINE CONTROL MODULE (ECM)»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb__encoding-ii-engine-control-module-ecm) .
2. Perform adaptation of Throttle Valve Control Module -J338-. See «THROTTLE VALVE CONTROL MODULE -J338-, ADAPTING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__throttle-valve-control-module-j338-adapting) .
3. In vehicles with cruise control system (recognizable by the steering column switch) this must be activated in the Engine Control Module. See «CRUISE CONTROL SYSTEM, ACTIVATING/DEACTIVATING»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb__cruise-control-system-activatingdeactivating) .
4. Check DTC memory and erase, if necessary.

The sequence is described in VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS .

Scheme 7

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

Removing ECMs without metal anti-theft housing. See 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.
2. Always allow display of control module identification first and print it out.
3. Switch ignition off.
4. Pull off plenum chamber cover rubber seal in direction of arrow.
5. Remove cover -1- toward front.
6. Pry off both covers -3- using a screwdriver.
7. Loosen hex-nuts -4- several turns.
8. Loosen wiper arm -2- by lightly tilting from wiper axle.
9. Remove hex nuts completely and remove wiper arms.
10. Disconnect securing clips -1- and remove cowl grill -5-.
11. Remove cover for E-box, plenum chamber -arrows-.
12. Using a screwdriver, carefully pry off retaining bracket -arrow-.

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

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-.

Scheme 8

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

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

Scheme 9

Scheme 10

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.
2. 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. WARNING: By heating the locking mechanism threads, the snap-off screws and parts of the metal anti-theft housing will also become very hot. Be careful not to get burned! If possible, also make sure that only the threads and no other parts in the vicinity become heated. If necessary, cover them.
3. 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.
4. Switch on heat gun and heat up threads for approx. 20 to 25 seconds.
5. 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.
6. 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.
7. Switch on heat gun and heat up threads for approx. 20 to 25 seconds.
8. Next, using locking pliers -1-, grab screw head -2- and remove snap-off screw by turning in direction of arrow.
9. Disengage connectors from Engine Control Module (ECM) and disconnect connectors.
10. 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". Also see, «The following operations must be carried out after installing the Engine Control Module»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__the-following-operations-must-be-carried) .

Use VAS5051 tester to do so.

Special tools and workshop equipment required

1. VAS 5051
2. VAS 5051/1 adapter

Test requirements

1. No leaks in exhaust system
2. Coolant temperature at least 80 °C.
3. Electrical devices switched off (radiator fan must not run during the test).
4. Air conditioning switched off.
5. Pressure gauge not connected.
6. Vehicles with automatic transmission: Selector lever in position P or N.

Note. The idle speed (RPM) cannot be adjusted. The idle speed (RPM) is tested during the basic setting of the engine. During basic setting, the Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- is closed and the air conditioner compressor is switched off.

Test sequence

1. Connect vehicle diagnostic, testing and information system VAS 5051. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Engine must be running at idle.
2. Check DTC memory. Go to «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . There must not be any DTCs stored. If necessary, repair any DTCs and erase the DTC memory. After erasing DTC memory, generate readiness code. Go to «READINESS CODE, GENERATING»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) .
3. Leave engine idling.

Display on VAS 5051

Scheme 11

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

Display on VAS 5051

Scheme 12

1. Enter display group

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

Display on VAS 5051

Scheme 13

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

DISPLAY GROUP 056: IDLING SPEED STABILIZATION AT OPERATING TEMPERATURE

Note. The engine speed (RPM) in display zone 1 (actual speed) is the actual engine speed. The engine speed (RPM) in display zone 2 (specified speed) is a theoretical value calculated by the engine control module. At idle, the ECM always tries to adapt the actual engine speed (RPM) to the desired (specified) engine speed (RPM). This means that the actual engine speed (RPM) must always approximately match the specified engine speed (RPM) at idle. The display zones 3 and 4 are there for information but are irrelevant to the control of the engine at idle.

1. Exit function "04 - Basic setting" by pressing < button. If specified value is not obtained
2. Check DTC memory again. See «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) .
3. If DTC memory has been erased, generate readiness code. See «READINESS CODE, GENERATING»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) .

If the idle is too high or too low and there are no DTCs recorded in the DTC memory, perform the following tests

1. Check intake air system for unmetered air. Go to «INTAKE AIR SYSTEM FOR LEAKS (UNMETERED AIR), CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__intake-air-system-for-leaks-unmetered) .
2. Check Throttle Valve Control Module -J338-. See «THROTTLE VALVE CONTROL MODULE -J338-, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__throttle-valve-control-module-j338-checking) .
3. Check to see if Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- is continuously held open. Go to «FUEL TANK VENTILATION SYSTEM, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .
4. Perform adaptation of Throttle Valve Control Module -J338-. Go to «THROTTLE VALVE CONTROL MODULE -J338-, ADAPTING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__throttle-valve-control-module-j338-adapting) .

Significance of 5 digit indication of display group 056

DISPLAY GROUP 056 - 5 DIGIT INDICATION

System pressure, fuel pressure regulator and residual pressure, checking

Note. The fuel pressure regulator is located in the fuel filter underneath the tank. Fuel pressure regulator regulates fuel pressure according to intake manifold pressure. This ensures that the pressure drop at the fuel injectors remains the same for each speed and load range of the engine.

1. V.A.G 1318 Pressure gauge
2. V.A.G 1318/6 Adapter
3. V.A.G 1318/7 Adapter

1. Fuel pump relay OK.
2. Fuel pump OK; checking: See «FUEL PUMP (FP), ELECTRICAL TESTING»(/audi/a4/b7-2004-2009/remont/fuel-system/#fuel-supply-generic-scan-tool-18l-5v-turbo-amb) for FWD up to 06.2003. See «CHECKING FUEL PUMP ELECTRICALLY»(/audi/a4/b7-2004-2009/remont/fuel-system/#fuel-supply-generic-scan-tool-18l-5v-turbo-amb) for FWD from 07.3003. See «FUEL PUMP (FP), ELECTRICAL TESTING»(/audi/a4/b7-2004-2009/remont/fuel-system/#fuel-supply-generic-scan-tool-18l-5v-turbo-amb) for AWD up to 06.2003. See «CHECKING FUEL PUMP ELECTRICALLY»(/audi/a4/b7-2004-2009/remont/fuel-system/#fuel-supply-generic-scan-tool-18l-5v-turbo-amb) for AWD from 07.2003 on.
3. Fuel filter OK
4. Battery voltage at least 12.7 V
5. Vehicles with automatic transmission: Selector lever in position P or N.

Checking system pressure

1. Remove engine cover -arrows-.
2. Open fuel filler flap and briefly open the fuel tank filler cap (to release pressure).
3. Remove engine cover.

Vehicles up to 06.03

1. Disconnect fuel supply line -1- and expose.

Note. Disregard item no. -2-.

Scheme 14

Vehicles as of 07.03

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

All

1. Connect pressure gauge V.A.G 1318 using adapters 1318/6 and 1318/7 to feed line.
2. Open shut-off valve of pressure gauge. Lever points in direction of flow.
3. Start engine and run at idle.
4. Measure fuel pressure. Specified value: approx. 4.0 bar excess pressure
5. Switch ignition off.
6. Check leak tightness and holding pressure by watching gauge indicator fall. After 10 minutes the remaining pressure should be at least 2.5 bar excess pressure If the holding pressure drops below 2.5 bar
7. Start engine and run at idle.
8. Allow pressure to build up, then switch off ignition. At same time close shut-off valve on pressure gauge V.A.G 1318 (valve lever at right angles to direction of flow -arrow-).
9. Observe pressure drop on gauge.
10. Check pressure gauge for leaks.
11. Check line connections, O-rings on fuel rail and injectors for leaks.
12. Check pressure regulator in fuel filter.

Checking fuel pressure regulator - vehicles with front-wheel drive

1. Remove trim in luggage compartment.
2. If necessary fold right backrest of rear seatbench forward.
3. Unscrew cover for sealing flange -arrow-.
4. Disconnect fuel return line -2- from sealing flange.
5. Attach adapter piece V.A.G 1318/17-1 to return line.
6. Disconnect adapter piece using hose clamp 3094. NOTE: Do not attach hose clamp 3094 directly to fuel line. Danger of damage may occur.
7. Start engine and run at idling speed.
8. Allow pressure to build up, then switch off ignition. At same time close cut off valve on pressure gauge V.A.G 1318 (valve lever at right angles to direction of flow -arrow-).
9. Observe pressure drop on pressure gauge.
10. Check fuel pump non return valve.

If the pressure now does not drop

1. Replace fuel filter. See «FUEL TANK WITH ATTACHMENTS - COMPONENT OVERVIEW»(/audi/a4/b7-2004-2009/remont/fuel-system/#fuel-supply-generic-scan-tool-18l-5v-turbo-amb__fuel-tank-with-attachments-component) for FWD up to 06.2003. See «FUEL TANK WITH ATTACHMENTS - COMPONENT OVERVIEW»(/audi/a4/b7-2004-2009/remont/fuel-system/#fuel-supply-generic-scan-tool-18l-5v-turbo-amb) for FWD from 07.3003.

Note. Before removing the pressure gauge, release the fuel pressure by opening the cut off valve. When doing this hold a container over the connection. Assemble the fuel supply in reverse order.

1. Tighten union nut for fuel supply line -1- to 22 Nm.

Scheme 15

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

Checking fuel pressure regulator - vehicles with all wheel drive

1. Remove rear bench seat. See «SEATBENCH, REMOVING AND INSTALLING»(ref-197208-S04367109682005101400000) and for Cabriolet «REAR SEAT BENCH, ASSEMBLY OVERVIEW»(ref-197211-S07247328082005101300000) .
2. Unscrew cover for sealing flange from left -arrows-.

1. Disconnect fuel return line -arrow- from sealing flange (left side of vehicle).
2. Attach adapter piece V.A.G 1318/17-1 to return line.
3. Disconnect adapter piece using hose clamp 3094. NOTE: Do not attach hose clamp 3094 directly to fuel line - Danger of damage
4. Start engine and run at idling speed.
5. Allow pressure to build up, then switch off ignition. At same time close cut off valve on pressure gauge V.A.G 1318 (valve lever at right angles to direction of flow -arrow-).
6. Observe pressure drop on pressure gauge.
7. Check fuel pump non return valve.
8. Replace fuel filter. See «FUEL TANK WITH ATTACHMENTS - COMPONENT OVERVIEW»(/audi/a4/b7-2004-2009/remont/fuel-system/#fuel-supply-generic-scan-tool-18l-5v-turbo-amb) for AWD up to 06.2003. See «FUEL TANK WITH ATTACHMENTS - COMPONENT OVERVIEW»(/audi/a4/b7-2004-2009/remont/fuel-system/#fuel-supply-generic-scan-tool-18l-5v-turbo-amb) for AWD from 07.2003 on.

Assembly is performed in the reverse order, note the following while doing so

Note. Before removing the pressure gauge, release the fuel pressure by opening the cut off valve. When doing this hold a container over the connection.

1. Tighten union nut for fuel supply line -1- to 22 Nm.

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

1. V.A.G 1526 A Multimeter
2. V.A.G 1527 B Led voltage tester
3. V.A.G 1594 A Connector test kit
4. V.A.G 1598/31 Test box

Scheme 16

1. Remove engine cover -arrows-.

Scheme 17

1. Remove connector on fuel injector to be checked.
2. Connect multimeter to fuel injector to measure resistance. Specified value: 12...13 ohms (at room temperature)
3. Replace fuel injector.

If specified value is obtained

1. Fuse for injectors OK See appropriate System Wiring Diagrams article.
2. Fuel pump relay OK; checking. Go to «FUEL PUMP (FP) RELAY -J17- AND RELAY ACTIVATION, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__fuel-pump-fp-relay-j17-and) .

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

Scheme 18

1. Remove connector on fuel injector to be checked.
2. Connect LED voltage tester V.A.G 1527 B as follows: FUEL INJECTOR POWER SUPPLY TEST: CONNECTOR TERMINAL 1 Connector terminal Measure to 1 Engine ground (GND)
3. Operate starter briefly. LED should light up.

If the LED does not light up

1. Check wiring connection between terminal 1 and fuse for fuel injector for open circuit: See appropriate System Wiring Diagram article.
2. Repair any open circuit or wiring concerns.

If the LED lights up

1. Internal resistance of the valve OK

1. Push back rubber grommet of connector on fuel injector but leave connector attached.
2. Connect LED voltage tester V.A.G 1527 B between terminals 2 (signal) and 1 (B+).
3. Operate starter briefly. LED should flash.

Note. Voltage testers with a low current draw continue to glow faintly between activation from the Engine Control Module (ECM) (rather than extinguishing completely) and become slightly brighter when activated.

If LED does not flash

Scheme 19

1. Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect Engine Control Module (ECM). Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
2. Check for open circuit, short to positive, or short to ground in following wiring connections: FUEL INJECTOR ACTIVATION TEST: CONNECTOR TERMINAL 2, CYLINDER 1, 2, 3 & 4 Cylinder Injector connector terminal Test box V.A.G 1598/31 Socket 1 2 96 2 2 89 3 2 97 4 2 88
3. Repair any open/short circuit as necessary.
4. Replace Engine Control Module (ECM). Go to «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__engine-control-module-ecm-without-metal) .

Fuel rail with injectors, disassembling and assembling

Note. To prevent damage to the catalytic converter, the fuel system must be bled after work is performed on fuel rail or on fuel lines. Go to FUEL SYSTEM, BLEEDING . Vehicle must only be started after bleeding.

Note. The following list refers to (Scheme 56).

1. Hex head bolt - 10 Nm
2. Protective cap
3. Bracket Ensure it is positioned correctly on injector and fuel rail
4. Intake manifold With Throttle Valve Control Module -J338- With Intake Air Temperature (IAT) Sensor -G42
5. Insert for injector - 3 Nm Install with locking fluid D 000 600 A2
6. O-ring Removing and installing. Go to «FUEL INJECTORS, REMOVING AND INSTALLING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) . Replace Moisten with clean engine oil
7. Fuel injectors Cylinder 1 -N30- Cylinder 2 -N31- Cylinder 3 -N32- Cylinder 4 -N33- Removing and installing. Go to «FUEL INJECTORS, REMOVING AND INSTALLING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .
8. O-ring Removing and installing. Go to «FUEL INJECTORS, REMOVING AND INSTALLING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) . Replace Moisten with clean engine oil
9. Fuel supply line For vehicles up to 06.03, tighten union nut to 22 Nm Loosening and tightening union nut in vehicles as of 07.03. See «Loosening and tightening union nut for fuel supply line in vehicles as of 07.03»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__loosening-and-tightening-union-nut-for) . WARNING: Fuel system is under pressure! Before opening system, place rags around the connection point. Then release pressure by carefully loosening connection.
10. Fuel rail
11. Connector For injectors 4 pieces

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. Remove engine cover -arrows-.
2. Disconnect electrical connectors to Camshaft Position (CMP) Sensor -1- and to fuel injectors -2-.
3. Remove retaining bolts -3- of fuel rail.
4. Pull fuel distributor rail together with injectors off intake manifold and place it on a clean cloth at back of engine compartment. WARNING: The fuel system is pressurized! Before opening the system place a cloth around the connection point. Then release pressure by carefully loosening the connection.
5. Pull off retainer and disconnect injector. NOTE: Replacement of fuel rail involves disconnecting fuel hoses. Install in reverse order, paying attention to the following: Replace the O-rings at all opened connections. (when replacing the front O-ring, ensure that the plastic cap is not removed from the injector head. The O-ring must be pulled off over the plastic cap). Moisten the O-rings with clean engine oil. Make sure that the injectors are installed in the correct positions. Check to make sure that the retainer clamps are properly seated. Position fuel rail with secured injectors on intake manifold and press evenly into place.

Tightening Torque

TIGHTENING TORQUE: FUEL RAIL

1. V.A.G 1348/3A Remote control
2. V.A.G 1594 A Connector test kit
3. V.A.G 1598/31 Test box
4. V.A.G 1602 Injection quantity tester
5. VAS 5051
6. VAS 5051/1 Adapter

Scheme 20

1. Fuel pressure OK, checking. See «System pressure, fuel pressure regulator and residual pressure, checking»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__system-pressure-fuel-pressure-regulator-and) .

1. Remove fuel rail including injectors installed from intake manifold. Go to «FUEL INJECTORS, REMOVING AND INSTALLING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) . Fuel hoses remain connected.
2. Connect VAG1598/31 test box at wiring harness to ECM, do not connect to ECM. Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .

Leak test

1. Jumper terminals 1 and 65 at test box using adapter cables from VAG1594A connector test kit (this step supplies Ground (GND) to one side of relay coil for Fuel Pump (FP) relay).
2. Switch ignition on. NOTE: After switching ignition on, Fuel Pump (FP) will run continuously, even with engine not running. This is true because: Fuel Pump (FP) relay is supplied with B+ via central electrics after ignition is switched on. Fuel Pump (FP) relay receives ground (GND) via the jumper in test box. Fuel pump must run.
3. Check proper seal of fuel injectors visually. With Fuel Pump (FP) running, only 1-2 drops per minute may drip out per injector.
4. If fuel loss is greater, stop Fuel Pump (FP) from running (switch off ignition) and replace faulty fuel injector. Go to «FUEL INJECTORS, REMOVING AND INSTALLING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .

Checking injection quantity

1. Insert fuel injector to be tested in a measuring glass from VAG 1602 injection quantity test device.
2. Connect one terminal of fuel injector to engine Ground (GND) using an adapter cable and an alligator clip from VAG 1594 A connector test kit.
3. Connect second terminal of fuel injector to B+ using VAG 1348/3A remote control, VAG 1348/3-2 adapter cable and assisting cable.
4. Jumper terminals 1 and 65 at test box with leads from adapter set VAG 1594 A.
5. Switch ignition on. Fuel pump must run.
6. Activate VAG 1348/3A remote control for 30 seconds.
7. Perform measurements on all fuel injectors.
8. After all four fuel injectors have been activated, place measuring glasses on an even surface. Specification per injector: 135 +/- 10 ml.
9. If measured value of one or more fuel injectors is outside of specified range, switch Fuel Pump (FP) off (switch ignition off) and replace faulty fuel injector. Go to «FUEL INJECTORS, REMOVING AND INSTALLING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .
10. If measured values for all fuel injectors are outside specified range, check fuel pressure. Go to «SYSTEM PRESSURE, FUEL PRESSURE REGULATOR AND RESIDUAL PRESSURE, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__system-pressure-fuel-pressure-regulator-and) . NOTE: Also check spray pattern when checking injection quantity. Spray pattern must be the same for all injectors.
11. Reinstall fuel injectors together with fuel rail. Go to «FUEL INJECTORS, REMOVING AND INSTALLING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .

Fuel Pump (FP) Relay -J17- and relay activation, checking

Special tools and workshop equipment required

1. V.A.G 1526 A Multimeter
2. V.A.G 1594 A Connector test kit
3. V.A.G 1598/31 Test Box
4. VAS 5051 Diagnostic operation system
5. VAS 5051/1 Adapter

Scheme 21

The fuel pump and certain components of the injection system are supplied with power by way of the Fuel Pump (FP) Relay -J17-.

The Fuel Pump (FP) Relay -J17- is only energized when the engine is running, i.e. the relay is only connected to ground (via the Engine Control Module) when engine speed pulses are detected in the Engine Control Module.

Note. The fuel pump relay is located on the 9-unit relay carrier on the left in the driver's footwell, position 1.

Scheme 22

1. Battery voltage at least 12.7 V

Functional check of Fuel Pump (FP) Relay -J17

1. Remove driver's storage compartment: See «DRIVER-SIDE STORAGE COMPARTMENT (WITH AND WITHOUT KNEE BOLSTER), ASSEMBLY OVERVIEW»(ref-197206-S03507421422005101300000) and for Cabriolet «DRIVER'S STORAGE COMPARTMENT (VEHICLES WITH AND WITHOUT KNEE BOLSTER), ASSEMBLY OVERVIEW»(ref-197209-S29048734852005101300000) .
2. Connect vehicle diagnostic, testing and information system VAS 5051. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Ignition must be switched on.
3. Initiate Output Diagnostic Test Mode (DTM). Go to «OUTPUT DIAGNOSTIC TEST MODE (DTM)»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb__output-diagnostic-test-mode-dtm) . Activate ACF solenoid valve -N80-. Fuel pump relay (on the 9-unit-relay carrier in the driver's footwell on the left, position 1) should pull and fuel pump should run.

1. If relay does not respond: Check voltage supply of Fuel Pump (FP) Relay -J17-. Go to «CHECKING VOLTAGE SUPPLY OF FUEL PUMP (FP) RELAY -J17»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) . Check activation of Fuel Pump (FP) Relay -J17-. Go to «CHECKING ACTIVATION OF FUEL PUMP (FP) RELAY -J17»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .
2. If relay is energized but fuel pump does not run: Check voltage supply for fuel pump and components (via Fuel Pump (FP) Relay -J17-). Go to «CHECKING VOLTAGE SUPPLY OF FUEL PUMP AND COMPONENTS»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__checking-voltage-supply-of-fuel-pump) .

Scheme 23

1. Disconnect Fuel Pump (FP) Relay -J17-.
2. Connect multimeter as follows to measure voltage. FUEL PUMP RELAY VOLTAGE SUPPLY TEST: TERMINAL 1 9-unit relay carrier in driver's footwell on left, position 1 terminal Measure to 1 Car body ground (GND) Specified value: approx. battery voltage
3. Connect multimeter as follows to measure voltage: FUEL PUMP RELAY VOLTAGE SUPPLY TEST: TERMINAL 3 9-unit relay carrier in driver's footwell on left, position 1 terminal Measure to 3 Car body ground (GND)
4. Switch ignition on. Specified value: approx. battery voltage (B+)

If the specified values are not obtained

1. Check wiring connections. See appropriate System Wiring Diagram article.

If specifications are obtained

Scheme 24

1. Switch ignition off.
2. Re-insert relay.
3. Connect test box V.A.G 1598/31 to wiring harness for engine control module; do not connect to engine control module (ECM). Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
4. Switch ignition on.
5. Jumper terminals 1 and 65 at test box with leads from adapter set V.A.G 1594A. Fuel Pump (FP) Relay -J17- (on the 9-unit-relay carrier in the driver's footwell on the left, position 1) should pull fuel and fuel pump should run.
6. Replace Engine Control Module (ECM). Go to «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__engine-control-module-ecm-without-metal) .
7. Switch ignition off.
8. Disconnect cable link.
9. Disconnect Fuel Pump (FP) Relay -J17-.
10. Check for open circuit, short to positive, or short to ground (GND) in following wiring connection: FUEL PUMP RELAY ACTIVATION TEST: TERMINAL 5, SOCKET 65 9-unit relay carrier in driver's footwell on left, position 1 terminal Test box V.A.G 1598/31 Socket 5 65
11. Repair any open/short circuit as necessary.
12. Replace Fuel Pump (FP) Relay -J17-.
13. Reconnect ECM.

Checking voltage supply of fuel pump and components

1. Disconnect fuses S228, S229 and S234 (positions 28, 32 and 34) in fuse holder.
2. Initiate Output Diagnostic Test Mode (DTM). See «OUTPUT DIAGNOSTIC TEST MODE (DTM)»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb__output-diagnostic-test-mode-dtm) . Activate EVAP Canister Purge Regulator Valve -N80-.
3. To measure voltage, connect multimeter to ground (GND) and to one terminal of following fuses in fuse holder. FUEL VOLTAGE SUPPLY FUSE REFERENCE Fuse Specified value at one of the terminals S228 approx. battery voltage (B+) S232 approx. battery voltage (B+) S234 approx. battery voltage (B+)
4. Repeat test at other terminal of fuse base.
5. Check wiring connections. See appropriate System Wiring Diagram article.
6. Replace Fuel Pump (FP) Relay -J17-.
7. Reinstall fuses.

Mass Air Flow (MAF) sensor -G70-, checking

Special tools and workshop equipment required

1. V.A.G 1526 A Multimeter
2. V.A.G 1594 A Connector test kit
3. V.A.G 1598/31 Test Box
4. VAS 5051 Diagnostic operation system
5. VAS 5051/1 Adapter

Scheme 25

Component Location. Go to COMPONENT LOCATIONS, OVERVIEW .

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

Scheme 26

1. Connect vehicle diagnostic, testing and information system VAS 5051. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Engine must be run at idle speed. Display on VAS 5051
2. Under -1- select diagnostic function "04 - Basic setting".

Display on VAS 5051

Scheme 27

1. Enter display group

Scheme 28

1. Enter "002" for "display group number 002" in zone -2- and confirm entry by pressing -Q- button. Display on VAS 5051
2. Activate basic setting by pressing -A- button.
3. Check indication in display fields -3- and -4-. DISPLAY GROUP 002: MASS AIR FLOW AT IDLE AND OPERATING TEMPERATURE Display zones 1 2 3 4 Display group 002: Mass air flow at idle and operating temperature Display xxx rpm xxx % xx.x ms xxx.x g/s Display Engine speed Load Average injection period Air mass Specified value 700..860 rpm 13...45% 1.0..0.4.0 ms 2.0...4.5 g/s Note: - - If specified value is not obtained: Evaluation. Go to «EVALUATION OF DISPLAY GROUP 002»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__evaluation-of-display-group-002) .
4. Exit function "04 - Basic setting" by pressing < button.

Evaluation of display group 002

EVALUATION OF DISPLAY GROUP 002

1. Fuse for Mass Air Flow (MAF) sensor OK. See appropriate System Wiring Diagram article.
2. Fuel pump relay OK; checking. Go to «FUEL PUMP (FP) RELAY -J17- AND RELAY ACTIVATION, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__fuel-pump-fp-relay-j17-and) .

Note. Voltage supply to Mass Air Flow (MAF) sensor is from Fuel Pump (FP) Relay -J17-.

Scheme 29

1. Disconnect connector -arrow- to Mass Air Flow (MAF) sensor
2. Connect multimeter as follows to measure voltage. MAF SENSOR VOLTAGE SUPPLY: CONNECTOR TERMINAL 2 Connector terminal Measure to 2 Engine ground
3. Operate starter briefly. Specified value: approx. battery voltage (B+)
4. Check wiring from terminal 2 on connector via fuse to fuel pump relay for open circuit or short to ground: See appropriate System Wiring Diagrams article.
5. Repair any open/short circuit as necessary.

If specified value is obtained

Scheme 30

1. Connect hand-held multimeter to terminals 2 and 3 of connector to measure voltage.
2. Operate starter briefly (engine may start). Specified value: approx. battery voltage (B+) NOTE: Engine control module ground (GND) is present at terminal 3 of the connector. If specified value is not obtained
3. Check wiring. Go to «WIRING TO MASS AIR FLOW (MAF) SENSOR -G70-, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__wiring-to-mass-air-flow-maf) .
4. Connect hand-held multimeter to terminals 3 and 4 of connector to measure voltage. Specified value: approx. 5 V
5. Check wiring. Go to «WIRING TO MASS AIR FLOW (MAF) SENSOR -G70-, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__wiring-to-mass-air-flow-maf) .

Wiring to Mass Air Flow (MAF) sensor -G70-, checking

Note. The signal wire is also checked during the wiring check.

Scheme 31

1. Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect Engine Control Module (ECM). Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
2. Check for open circuit, short to positive, or short to ground (GND) in following wiring connections: MAF SENSOR WIRING CHECK: CONNECTOR TERMINAL 3, 4, 5 & SOCKET 27, 53, 29 Connector terminal Test box V.A.G 1598/31 Socket 3 27 4 53 5 29
3. Repair any open/short circuit as necessary.
4. Additionally check all wires for short to one another.
5. Replace Mass Air Flow (MAF) sensor -G70-.

Intake air system for leaks (unmetered air), checking

Special tools, workshop equipment and other Items required

1. VAS 5051
2. VAS 5051/1 Adapter
3. Engine leak detector spray G 001 800 A1

Note. The vacuum in the intake system will cause the leak detector spray to be drawn in with the unmetered air. The leak detector spray reduces the ignitability of the mixture. This leads to a drop in engine speed and to a significant increase of the CO content. The safety precautions listed on the container must be adhered to.

1. Connect vehicle diagnostic, testing and information system VAS 5051. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Engine must be run at idle.
2. Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS 5051

Scheme 32

1. Enter display group

1. Enter "001" for "display group number 001" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS 5051

Scheme 33

1. Note engine speed in display zone -1-.
2. Systematically spray parts of intake system with engine leak detector spray.
3. Check sprayed areas of intake system for leaks and repair if necessary.
4. Exit function "08 - Read measured value block" by pressing key.
5. Under -1- select diagnostic function "06 - End output".
6. Switch ignition off.

Fuel system, bleeding

1. V.A.G 1318 Pressure gauge
2. V.A.G 1318/21 Adapter
3. VAS5051 tester
4. VAS 5051/1 Adapter
5. VAS 5226 Test box

Scheme 34

Fuel system without return line

Note. The fuel system without return line is recognized by the sealing cap -2- at connection for return line on the fuel rail. To prevent damage to catalytic converter the fuel system without return line must be bled after repair work on fuel rail or on fuel lines. The vehicle must only be started after bleeding Observe the rules for cleanliness. Go to RULES FOR CLEANLINESS .

1. Close shut-off valve on special tool V.A.G. 1318/21 by turning in "-" direction up to stop.
2. Unthread sealing cap from bleeder connection -2- and connect V.A.G 1318/21 Adapter instead.
3. Connect V.A.G. 1318/21 Adapter and VAS 5226 catch reservoir with assistance of V.A.G. 1318 pressure gauge. WARNING: All connection areas must be secured!
4. Open shut-off valve on special tool V.A.G. 1318/21 by turning in "+" direction.
5. Switch ignition on. Fuel pump starts up briefly
6. Switch ignition off.

If the fuel pump does not operate, or fuel flows out on catch reservoir VAS 5226 continuously with bubbles

1. Connect VAS5051 tester and select control module for engine electronics using "address word" 01. Ignition must be switched on.
2. Initiate output DTM and activate Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-. Go to «OUTPUT DIAGNOSTIC TEST MODE (DTM)»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb__output-diagnostic-test-mode-dtm) .

Note. Fuel pump must run during activation time.

Fuel system is bled when fuel exits into VAS 5226 catch reservoir without bubbles.

1. End function "03 - output Diagnostic Test Mode (DTM)" by pressing < button. WARNING: Fuel system is under pressure! Before opening system, place rags around the connection point. Then release pressure by carefully loosening connection.
2. Close shut-off valve on special tool V.A.G. 1318/21 by turning in "-" direction up to stop.
3. Remove V.A.G. 1318/21 Adapter from bleeder connection.
4. Thread on sealing cap to bleeder connection -2-.

1. V.A.G 1526 A Multimeter
2. V.A.G 1594 A Connector test kit
3. V.A.G 1598/31 Test box
4. VAS 5051
5. VAS 5051/1 Adapter

Scheme 35

1. No leaks in exhaust system
2. Coolant temperature at least 80 °C.

1. Connect vehicle diagnostic, testing and information system VAS 5051. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Engine must be run at idle speed.
2. Under -1- select diagnostic function "04 - Basic setting".

Display on VAS 5051

Scheme 36

1. Enter display group

1. Enter "030" for "display group number 030" in field -2- and confirm entry by pressing -Q- button.
2. Activate basic setting by pressing -A- button.
3. Check specification in display field -1-.

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 Sensor (O2S).

DISPLAY GROUP 030: OXYGEN SENSOR (O2S) STATUS

SIGNIFICANCE OF 3-DIGIT READOUT OF DISPLAY GROUP 030

Note. The first digit of the 3-digit display (heating) fluctuates between 0 and 1.

Display on VAS 5051

Scheme 37

1. Only continue test if display in display field -1- has reached "111" at least once.
2. Press < button.

Checking Oxygen Sensor (O2S) adaptation values and Oxygen Sensor (O2S) control

Display on VAS 5051

Scheme 38

1. Enter display group

1. Enter "032" for "display group number 032" in field -2- and confirm entry by pressing -Q- button.

Display on VAS 5051

Scheme 39

1. Activate basic setting by pressing -A- button.
2. Check indication in display groups -1- and -2-. DISPLAY GROUP 032: OXYGEN SENSOR (O2S) ADAPTATION VALUES (BANK 1, SENSOR 1) Display fields 1 2 3 4 Display group 032: Oxygen Sensor (O2S) adaptation values (bank 1, sensor 1) Display xx.x % xx.x % Display Oxygen Sensor (O2S) adaptation value bank 1, sensor 1 at idle (additive) Oxygen Sensor (O2S) adaptation value bank 1, sensor 1 at partial throttle (multiplicative) Specified value -5.0...5.0% -10.0...10.0% Note: If the specified value is not obtained. Go to «EVALUATING DISPLAY GROUP 032»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__evaluating-display-group-032-below-specified) .
3. Press < button.

Display on VAS 5051

Scheme 40

1. Enter display group

1. Enter "033" for "display group number 033" in field -2- and confirm entry by pressing -Q- button.
2. Activate basic setting by pressing -A- button.
3. Check indication in display groups -1- and -2-.

DISPLAY GROUP 033: OXYGEN SENSOR CONTROL (BANK 1, SENSOR 1)

Note on display field 2

Displayed is the Oxygen Sensor (O2S) voltage signal which was prepared and smoothed in the Engine Control Module (ECM). 1.5 V in the display corresponds to Oxygen Sensor (O2S) 1.

(Cont.)

If the specified result is not obtained in display field, or if the value does not fluctuate by at least 2%

1. Perform test drive to free Oxygen Sensor (O2S) from any possible residues and repeat test.
2. Check basic voltage. Go to «CHECKING BASIC VOLTAGE»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .
3. Check Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC) heating. Go to «OXYGEN SENSOR (O2S) HEATING -Z19- FOR OXYGEN SENSOR BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .
4. Check Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC) aging. Go to «OXYGEN SENSOR (O2S) BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .

Evaluating display group 032 (below specified range)

EVALUATING DISPLAY GROUP 032 (BELOW SPECIFIED RANGE)

Evaluating display group 032 (above specified range)

EVALUATING DISPLAY GROUP 032 (ABOVE SPECIFIED RANGE)

Evaluating display group 033

EVALUATING DISPLAY GROUP 033

Scheme 41

1. Disconnect 6-pin connector (black) -5- to Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC). NOTE: To gain access to the connector, remove coolant expansion tank bolt -arrow- and move expansion tank to side. Fuel hoses remain connected.
2. Connect multimeter between terminals 1 and 5 to measure voltage.
3. Switch ignition on. Specified value: 0.400...0.500 V
4. Switch ignition off.
5. Check Oxygen Sensor (O2S) wiring.
6. Replace Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC).

Scheme 42

Scheme 43

1. Disconnect 6-pin connector (black) -5- to Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC). NOTE: To gain access to the connector, remove coolant expansion tank bolt -arrow- and move expansion tank to side. Fuel hoses remain connected.
2. Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect Engine Control Module (ECM). Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
3. Test for open circuit in the following wiring connections. TESTING HO2S BEFORE TWC WIRING: CONNECTOR TERMINAL 1, 2, 5, 6 & SOCKET 70, 71, 51, 52 Connector terminal Test box V.A.G 1598/31 Socket 1 70 2 71 5 51 6 52
4. Repair open circuit, if necessary.
5. Check for shorts between two wires.
6. Replace Engine Control Module (ECM). Go to «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__engine-control-module-ecm-without-metal) .

1. VAS 5051
2. VAS 5051/1 Adapter

1. Coolant temperature at least 80 °C.

1. Connect vehicle diagnostic, testing and information system VAS 5051. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Engine must be run at idle.
2. Under -1- select diagnostic function "04 - Basic setting".

Display on VAS 5051

Scheme 44

1. Enter display group

1. Enter "034" for "display group number 034" in field -2- and confirm entry by pressing -Q- button.
2. Activate basic setting by pressing -A- button.
3. Press accelerator and brake pedal simultaneously, engine speed increases to approx. 2300 rpm.

Test conditions

1. Accelerator and brake pedal pressed simultaneously, engine runs at approx. 2300 rpm.

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

DISPLAY GROUP 034: DIAGNOSIS, OXYGEN SENSOR (O2S) AGING (BANK 1, SENSOR 1)

Note on display fields 3 and 4

The dynamics factor is the characteristic for the aging of the Oxygen Sensor (O2S). The lower the dynamics factor the more advanced is the aging of the Oxygen Sensor (O2S).

If specification in display field 3 or 4 is not obtained

1. Perform test drive to free Oxygen Sensor (O2S) from any possible residues and repeat test.
2. Replace Oxygen Sensor (O2S) 1 before Three Way Catalytic Converter (TWC).

1. V.A.G 1526 A Multimeter
2. V.A.G 1594 A Connector test kit
3. V.A.G 1598/31 Test box

Scheme 45

1. Coolant temperature at least 80 °C
2. Fuse for Oxygen Sensor (O2S) heating OK.

See appropriate System Wiring Diagrams article.

Scheme 46

Scheme 47

1. Disconnect 6-pin connector (black) -5- to Oxygen Sensor before Three Way Catalytic Converter (TWC). NOTE: To gain access to the connector, screw out coolant expansion tank bolt -arrow- and move expansion tank to side. Fuel hoses remain connected.
2. Connect multimeter between terminals 3 and 4 to measure resistance. Specified value at room temperature 2.5...10 ohms
3. Replace Oxygen Sensor 1 before Three Way Catalytic Converter (TWC) -G39-.

If specified value is obtained

Checking voltage supply for Oxygen Sensor heating

1. Connect multimeter between terminals 3 and 4 to measure voltage.
2. Start engine. Specified value: approx. battery voltage (B+)

Note. Points at which Oxygen Sensor heating is switched on and off by Engine Control Module (ECM) can be observed in "Reading measured value block" function, display group number 041 and display zone 2.

If no voltage is present

Scheme 48

Scheme 49

Scheme 50

1. Connect multimeter as follows to measure voltage. HO2S BEFORE TWC HEATER VOLTAGE TEST: MEASURING CONNECTOR TERMINAL 3 Connector terminal Measure to 3 Engine ground (GND)
2. Operate starter briefly. Specified value: approx. battery voltage (B+)
3. Check wiring from terminal 3 on the connector via the fuse to fuel pump relay for an open circuit: See appropriate System Wiring Diagram article.
4. Connect multimeter as follows to measure voltage: HO2S BEFORE TWC HEATER VOLTAGE TEST: CONNECTOR TERMINAL 4 Connector terminal Measure to 4 (engine control module ground activation) Battery positive (B+)
5. Start engine. Specified value: approx. battery voltage (B+) NOTE: Points at which Oxygen Sensor heating is switched on and off by engine control module can be observed in "Reading measured value block" function, display group number 041 and display zone 2.
6. Switch ignition off.
7. Connect test box V.A.G 1598/31 to wiring harness for engine control module; do not connect directly to Engine Control Module (ECM). Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
8. Check for open circuit in following wiring connections: HO2S BEFORE TWC HEATER OPEN CIRCUIT TEST:CONNECTOR TERMINAL 4 & SOCKET 5 Connector terminal Test box V.A.G 1598/31 Socket 4 5
9. Repair open circuit, if necessary.
10. Replace Engine Control Module (ECM). Go to «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__engine-control-module-ecm-without-metal) .

Oxygen Sensor (O2S) and Oxygen Sensor control before Three Way Catalytic Converter (TWC), checking

Note. The Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC) (Bank 1, sensor 1) changes to Oxygen Sensor 1. If this Oxygen Sensor (O2S) is damaged, e.g. through contamination or overheating, the control value can be changed. Deviations from Oxygen Sensor 1 are recorded by the Oxygen Sensor (O2S) after the Three Way Catalytic Converter (TWC) (Bank 1, sensor 2). If these deviations are recognized downward or upward it influences the control before the Three Way Catalytic Converter (TWC) in such a way that it is generally raised or lowered accordingly.

1. V.A.G 1526 A Multimeter
2. V.A.G 1594 A Connector test kit
3. V.A.G 1598/31 Test box
4. VAS 5051
5. VAS 5051/1 Adapter

Scheme 51

1. No leaks in exhaust system
2. Coolant temperature at least 80 °C.

1. Connect vehicle diagnostic, testing and information system VAS 5051. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Engine must be run at idle.
2. Under -1- select diagnostic function "04 - Basic setting".

Display on VAS 5051

Scheme 52

1. Enter display group

1. Enter "030" for "display group number 030" in field -2- and confirm entry by pressing -Q- button.
2. Activate basic setting by pressing -A- button.
3. Check indication in display group -2-.

Note. By increasing the engine speed the specified values are obtained more quickly. The "Oxygen Sensor status" indicates the condition of the Oxygen Sensor control and the Oxygen Sensor (O2S).

DISPLAY GROUP 030: OXYGEN SENSOR (O2S) STATUS AT IDLE

DISPLAY GROUP 030 3-DIGIT REFERENCE

Note. The first digit of the 3-digit display (heating) fluctuates between 0 and 1. The Oxygen Sensor control of the Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC). (B1-S2) is inactive without engine load.

Display on VAS 5051

Scheme 53

1. Only continue test if display in display field -2- has reached "110" at least once.
2. Press < button.

Oxygen Sensor control after Three Way Catalytic Converter (TWC), checking

Display on VAS 5051

Scheme 54

1. Enter display group

1. Enter "037" for "display group number 037" in field -2- and confirm entry by pressing -Q- button.
2. Activate basic setting by pressing -A- button.
3. Check Oxygen Sensor (O2S) voltage in display field -2-.
4. Check Oxygen Sensor (O2S) correction value in display field -3- and diagnosis result in display field -4-.

DISPLAY GROUP 037: DIAGNOSIS, OXYGEN SENSOR (O2S) CONTROL SYSTEM (BANK 1, SENSOR 2)

Note on display field 2

The Oxygen Sensor (O2S) voltage bank 1, sensor 2 should be kept as constant as possible. Strong voltage fluctuations indicate a damaged Three Way Catalytic Converter (TWC).

Evaluating display group 037

DISPLAY GROUP 037 TROUBLE SHOOTING

If specification in display field 3 or 4 is not obtained

1. Perform test drive to free Oxygen Sensor (O2S) from any possible residues and repeat test.
2. Replace Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC).

Note. If the Oxygen Sensor (O2S) voltage is OK and after a road test the Oxygen Sensor correction value is still outside the specification, this indicates aging of the Oxygen Sensor before the Three Way Catalytic Converter (TWC).

Scheme 55

Scheme 56

Scheme 57

1. Disconnect 4-pin connector -2- (brown) to Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC). NOTE: To gain access to the connector, remove coolant expansion tank bolt -arrow- and move expansion tank to side. Fuel hoses remain connected.
2. Connect multimeter between terminals 3 and 4 to measure voltage.
3. Switch ignition on. Specified value: 0.400...0.500 V
4. Switch ignition off.
5. Replace Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC) -G130-.
6. Disconnect 4-pin connector -2- (brown) to Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC) -G39-. NOTE: To gain access to the connector, remove coolant expansion tank bolt -arrow- and move expansion tank to side. Fuel hoses remain connected.
7. Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect Engine Control Module (ECM). Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
8. Test for open circuit in following wiring connections. HO2S AFTER TWC OPEN CIRCUIT TEST: CONNECTOR TERMINAL 3, 4 & SOCKET 68, 69 Connector terminal Test box V.A.G 1598/31 Socket 3 68 4 69
9. Repair open circuit, if necessary.
10. Check for shorts between two wires.
11. Replace Engine Control Module (ECM). See «Engine Control Module (ECM) (without metal anti-theft housing), replacing»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__engine-control-module-ecm-without-metal) .

1. VAS 5051
2. VAS 5051/1 Adapter

1. Coolant temperature at least 80 °C.

1. Connect vehicle diagnostic, testing and information system VAS 5051. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Engine must be run at idle.
2. Under -1- select diagnostic function "04 - Basic setting".

Display on VAS 5051

Scheme 58

1. Enter display group

1. Enter "043" for "display group number 043" in field -2- and confirm entry by pressing -Q- button.
2. Activate basic setting by pressing -A- button.
3. Press accelerator and brake pedal simultaneously; engine speed increases to approx. 2300 rpm.

1. Accelerator and brake pedal pressed simultaneously, engine runs at approx. 2300 rpm.

1. Check indication in display group -4-.

DISPLAY GROUP 043: DIAGNOSIS, OXYGEN SENSOR AGING (BANK 1, SENSOR 2)

If specification in display field 4 is not obtained

1. Perform test drive to free Oxygen Sensor (O2S) from any possible residues and repeat test.
2. Replace Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC) -G130-.

1. V.A.G 1526 A Multimeter
2. V.A.G 1594 A Connector test kit
3. V.A.G 1598/31 Text box

Scheme 59

1. Coolant temperature at least 80 °C.
2. Fuse for Oxygen Sensor (O2S) heating OK. See appropriate System Wiring Diagrams article.

Scheme 60

Scheme 61

1. Disconnect 4-pin connector -2- (brown) to Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC) -G130-. NOTE: To gain access to the connector, remove coolant expansion tank bolt -arrow- and move expansion tank to side. Fuel hoses remain connected.
2. Connect multimeter between terminals -1- and -2- to measure resistance. Specified value at room temperature 6.4...47.5 ohms
3. Replace Oxygen Sensor (O2S) after Three Way Catalytic Converter (TWC) -G130-.
4. Connect multimeter between terminals -1- (positive (B+)) and -2- (ground (GND)) to measure voltage.
5. Start engine. Specified value: approx. battery voltage (B+)

Note. Points at which Oxygen Sensor (O2S) heating is switched on and off by Engine Control Module (ECM) can be observed in "Reading measured value block" function, display group number 041 and display field 4.

If no voltage is present

Scheme 62

Scheme 63

Scheme 64

1. Connect multimeter as follows to measure voltage: HO2S AFTER CATALYTIC CONVERTER: MEASURING CONNECTOR TERMINAL 1 Connector terminal Measure to 1 Engine ground (GND)
2. Operate starter briefly. Specified value: approx. battery voltage (B+) If no voltage is present again
3. Check wire connection from connector terminal 1 via fuse to fuel pump relay for open circuit: See appropriate System Wiring Diagram article.
4. Connect multimeter as follows to measure voltage: HO2S AFTER CATALYTIC CONVERTER: MEASURING CONNECTOR TERMINAL 2 VOLTAGE Connector terminal Measure to 2 (ground activation by ECM) Battery positive (B+)
5. Start engine. Specified value: approx. battery voltage (B+), voltage may fluctuate
6. Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect to the ECM. Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
7. Check for open circuit in the following wiring connections: HO2S AFTER CATALYTIC CONVERTER, OPEN CIRCUIT TEST: CONNECTOR TERMINAL 2 & SOCKET 63 Connector terminal Test box V.A.G 1598/31 Socket 2 63
8. Repair open circuit, if necessary.
9. Replace Engine Control Module (ECM). Go to «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__engine-control-module-ecm-without-metal) .

Special tools, workshop equipment and other Items required

1. Box wrench set 3337
2. High-temperature lubricant G 052 112 A3

1. Disconnect connector for Oxygen Sensor (O2S) and move wiring clear.

1. 2 - (brown) to Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC) -G130
2. 5 - (black) to Oxygen Sensor (O2S) before Three Way Catalytic Converter (TWC) -G39

Note. To gain access to the connector, remove coolant expansion tank bolt -arrow- and move expansion tank to side. Fuel hoses remain connected.

Scheme 65

1. Remove Oxygen Sensor (O2S) using special tool 3337.

When installing, note the following points

Note. The screw thread on the Oxygen Sensor (O2S) is coated with assembly paste. This paste must not be allowed to penetrate the openings on the sensor. Tightening torque 55 Nm. When installing, the Oxygen Sensor (O2S) wire must be secured in exactly the same position as before in order to avoid contact between the wire and the exhaust pipe.

1. V.A.G 1526 A Multimeter
2. V.A.G 1527 B LED voltage tester
3. V.A.G 1594 A Connector test kit
4. V.A.G 1598/31 Text box
5. VAS 5051
6. VAS 5051/1 Adapter

Scheme 66

Testing for leaks

Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- remains closed when de-energized.

1. Disconnect hoses from Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- but leave electrical connector connected.
2. Connect auxiliary hose to one connection of Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-.
3. Connect vehicle diagnostic, testing and information system VAS 5051 or V.A.G 1551 Scan Tool and select engine electronics control module with "Address word" 01. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Ignition must be switched on.
4. Initiate final control diagnosis and activate Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-. Go to «OUTPUT DIAGNOSTIC TEST MODE (DTM)»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb__output-diagnostic-test-mode-dtm) . The valve should click... ...and should open and close (check by blowing into the auxiliary hose).
5. End function "03 - Output Diagnostic Test Mode (DTM)" by pressing < button
6. Replace Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-.

If the fuel injector does not click

Scheme 67

1. Disconnect connector on Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-.
2. Connect multimeter to fuel injector to measure resistance. Specified value: 22...30 ohms
3. Replace Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-.

If specified value is obtained

1. Fuse for Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- OK. See appropriate System Wiring Diagrams article.
2. Fuel pump relay OK; checking. Go to «FUEL PUMP (FP) RELAY -J17- AND RELAY ACTIVATION, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__fuel-pump-fp-relay-j17-and) .

Note. The Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80- receives its power supply via the fuel pump relay.

Scheme 68

1. Disconnect connector on Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-.
2. Connect LED voltage tester V.A.G 1527 B as follows: EVAP CANISTER PURGE REGULATOR VALVE: CONNECTOR TERMINAL 1 Connector terminal Measure to 1 Engine ground (GND)
3. Operate starter briefly (engine may start). LED should light up.
4. Check wiring from terminal -1- on connector via fuse to fuel pump relay for an open circuit: See appropriate System Wiring Diagram article.
5. Repair open circuit, if necessary.

If the LED lights up

Scheme 69

1. Connect LED voltage tester V.A.G 1527 B to terminals -1- (positive) and -2- of connector.
2. Initiate final control diagnosis and activate Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80-. Go to «OUTPUT DIAGNOSTIC TEST MODE (DTM)»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb__output-diagnostic-test-mode-dtm) . LED should flash.
3. Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect ECM. Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
4. Check for open circuit and short to positive (B+) or ground (GND) in following wiring connection: EVAP CANISTER PURGE REGULATOR VALVE: CONNECTOR TERMINAL 2 & SOCKET 64 Connector terminal Test box V.A.G 1598/31 Socket 2 64
5. Repair any open/short circuit as necessary.
6. Replace Engine Control Module (ECM). Go to «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__engine-control-module-ecm-without-metal) .

EPC system function

In the Electronic Power Control (EPC), the throttle valve is not operated by a cable connected to the accelerator pedal. There is no mechanical connection between the accelerator pedal and the throttle valve.

The position of the accelerator pedal is communicated to the Engine Control Module by two Throttle Position (TP) Sensors (variable resistances located in a single housing) connected to the accelerator pedal.

The position of the accelerator pedal (decided by the driver) is one of the main input parameters to the Engine Control Module (ECM).

The throttle valve is activated, over the full range of engine speed and power, by an electric motor (throttle valve actuator) in the Throttle valve control module -J338-.

The throttle valve actuator moves the throttle valve as instructed by the Engine Control Module (ECM).

With the ignition switched on and the engine not running, the Engine Control Module (ECM) controls the throttle valve precisely in accordance with the signals from the Throttle Position (TP) Sensors. This means that when the accelerator is pressed half way down, the throttle valve actuator opens the throttle valve to an equivalent extent; the throttle valve is then about half open.

When the engine is running (and under load), the Engine Control Module (ECM) can open and close the throttle valve independently of the accelerator position sensors.

As an example, the throttle valve can be fully open even though the accelerator pedal is only pressed half way down. This has the advantage of preventing throttle losses at the throttle valve.

Under certain engine load conditions, markedly improved emission and consumption figures are also obtained.

The engine torque necessary can be provided by the Engine Control Module (ECM) by an optimum combination of throttle opening and charge pressure.

The Electronic Power Control (EPC) system does not simply consist of one or two components but is, rather, a system which includes all the components which contribute to determining the position of the throttle valve and to controlling and monitoring this position. These components include, for example, the Throttle Valve Control Module, the EPC warning lamp, the Engine Control Module (ECM).

Electronic Power Control (EPC) Warning Lamp -K132- in instrument cluster

Note. The Electronic Power Control (EPC) Warning Lamp -K132- is also known as the EPC warning lamp.

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

When the ignition is switched on, the Engine Control Module (ECM) checks all the components of importance to the Electronic Power Control (EPC).

After switching on the ignition the Engine Control Module (ECM) switches on the Electronic Power Control (EPC) Warning Lamp -K132-. The EPC lamp goes out shortly after starting the engine, if, on the one hand, the Engine Control Module (ECM) does not detect any malfunctions in the EPC system, and, on the other, if activation of the lamp by the Engine Control Module (ECM) is OK.

If a malfunction is detected in the Electronic Power Control (EPC) while the engine is running, the Engine Control Module (ECM) switches on the Electronic Power Control (EPC) Warning Lamp -K132-. (These DTCs are listed in the DTC table). At the same time, an entry is made in the Engine Control Module DTC memory.

Functional check of warning lamp

1. Switch ignition on. Engine Control Module (ECM) switches on the Electronic Power Control (EPC) Warning Lamp -K132-.
2. Start engine. Shortly after starting the engine the exhaust warning lamp goes out if no malfunction in relation to the EPC is stored in the DTC memory.

Note. The switch-on signal for the warning lamp is transferred via CAN-bus to the instrument cluster by the Engine Control Module. Check the data exchange between Engine Control Module (ECM) and other CAN-bus control modules. Go to DATA EXCHANGE, MOTRONIC / ABS (CAN - BUS), CHECKING .

Throttle Valve Control Module -J338-, checking

The following components are located in the housing of the Throttle Valve Control Module -J338-.

1. Throttle drive (power accelerator activation) -G186-. (This is an electric motor which is activated by the Engine Control Module (ECM). This electric motor opens the throttle valve against the force of a spring).
2. Angle sensor 1 for throttle drive (power accelerator activation) -G187
3. Angle sensor 2 for throttle drive (power accelerator activation) -G188

Note. The housing of the Throttle Valve Control Module -J338- must not be opened. The angle sensors are in the form of potentiometers (variable resistances). They provide the position of the throttle valve to the Engine Control Module (ECM) completely independently of one another. The potentiometers cannot be adjusted mechanically. The settings are made as part of basic setting (function 04) using the vehicle diagnosis, measurement and information system VAS 5051.

Throttle Valve Control Module -J338-, adapting

The adaptation process enables the Engine Control Module (ECM) to learn the various positions of the throttle valve with the ignition switched on and the engine not running. These positions are stored in the control module. The feedback signal indicating the position of the throttle valve comes from the two throttle drive angle sensors.

If the Throttle Valve Control Module -J338- or the Engine Control Module (ECM) are removed, installed or replaced or if the voltage supply from the Engine Control Module (ECM) is interrupted, adaptation must always be performed.

The learning process (adaptation process) is performed

1. Automatically if the ignition is switched on once for at least 10 seconds without activating the starter or the accelerator pedal and the Engine Control Module (ECM) recognizes "adaptation requirement". In this case, however, it is not obvious whether the adaptation process was successful or not. Adaptation requirement is recognized if stored voltage values from the angle sensors do not coincide with current measured voltage values in a certain tolerance band.
2. By initiating the basic setting (Function 04) of display group 060 with ignition switched on.

Note. Engine will not start during automatic adaptation.

1. VAS 5051
2. VAS 5051/1 adapter

Preconditions

1. No DTCs recorded in DTC memory; check DTC memory. Go to «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) .
2. Engine stopped, ignition switched on
3. Accelerator pedal not depressed.
4. Coolant temperature 10...95 °C
5. Intake air temperature 10...90 °C
6. Voltage supply to Engine Control Module (ECM) greater than 12.7 V, Testing. Go to «MOTRONIC ENGINE CONTROL MODULE (ECM) POWER SUPPLY, CHECKING»(/audi/a4/b7-2004-2009/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb) .

1. Connect vehicle diagnostic, testing and information system VAS 5051. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Ignition must be switched on.

Display on VAS 5051

Scheme 70

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

Display on VAS 5051

Scheme 71

1 - Enter display group

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

Display on VAS 5051

Scheme 72

1. Activate basic setting by pressing -A- button.
2. Check specifications for Throttle Valve Control Module -J338- in display fields -3- and -4-.

The throttle valve drive is initially connected without voltage present.

In this condition, the throttle valve is pulled into an emergency running position by a mechanical spring which is located in the Throttle Valve Control Module -J338-. The values supplied by the two angle sensors in this emergency running position are stored in the Engine Control Module (ECM).

The throttle valve is then opened by a predetermined amount. When this value is reached, the throttle valve drive is again disconnected from the voltage supply. The mechanical spring should then close the throttle valve to the previously learned emergency running position within a specified period of time (spring test).

The throttle valve drive then closes the throttle valve; the values supplied by the angle sensors in the Throttle Valve Control Module -J338- are stored in the Engine Control Module (ECM).

If the Engine Control Module (ECM) disconnects the throttle valve drive from the voltage supply while the vehicle is being driven, the result will be an increased and fluctuating idling speed and a very poor throttle response.

DISPLAY GROUP 060: ADAPTATION OF THROTTLE VALVE CONTROL MODULE

Note. "ADP" in display field 4 stands for "Adaptation".

Note. The control module can abort adaptation for the following reasons: The throttle valve cannot close completely (e.g. contamination). The battery voltage is too low. Throttle Valve Control Module -J338- or wire connection is faulty. Engine is started during adaptation or accelerator pedal is operated. Tension of throttle valve housing (check bolts). When adaptation process is interrupted, message "Function is unknown or cannot be carried out at the moment" is displayed on tester. The next time the ignition is switched on (for several seconds), the adaptation process is automatically performed again.

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

Requirements

1. An original equipment air filter must be installed and it should be OK.
2. Intake air guide OK.
3. Fuel pressure OK.
4. Tank ventilation OK.
5. Fuel injectors OK.
6. Coolant temperature > 80 °C.
7. Oxygen sensor adaptation values and control OK. Go to «CHECKING OXYGEN SENSOR ADAPTATION VALUES AND CONTROL»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .

Work procedure. Go to WORK PROCEDURE .

1. Connect VAS5051 tester. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics". Engine must run at idle during this.

Display on VAS5051

Scheme 73

1. In selection -1-, click on the diagnostic function "04 - Basic Setting".

Display on VAS5051

Scheme 74

1 - Enter display group

Max. input value = 255

1. Select function "032" in button field -2- for "display group number 032" and press Q button to confirm input.

Work procedure

Display on VAS5051

Scheme 75

1. Check specified value in display field -2-.

DISPLAY GROUP 032: OXYGEN SENSOR ADAPTATION VALUES

1. Disconnect electrical harness connector from Mass Air Flow (MAF) sensor.

1. Connect VAS5051 tester. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics". Engine must run at idle during this.

Test requirement

1. Engine running at idle select "address word" 01 and "04" the "Initiate Basic Setting" function.

Display on VAS5051

Scheme 76

1 - Enter display group

1. Enter "107" in button field -2- for "display group number 107" and press Q button to confirm input.

Display on VAS5051

Scheme 77

1. Check indication in display field -4-.

DISPLAY GROUP 107: OXYGEN SENSOR CONTROL-SHORT TRIP

If specified value "System OK" is obtained in display field 4

1. Click on < button
2. Re-connect Mass Air Flow (MAF) sensor.
3. For further fault-finding, perform the next test step in the DTC table.

If specified value "System OK" is not obtained in display field 4

1. Click on < button
2. Clean air guide in throttle valve control module using a lint-free cloth and petroleum spirits.
3. Adapt throttle valve control module anew. Go to «THROTTLE VALVE CONTROL MODULE -J338-, ADAPTING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__throttle-valve-control-module-j338-adapting) .
4. Repeat test sequence: Oxygen sensor control - short trip, measuring value block 107 in Basic Setting 04.
5. Re-connect Mass Air Flow (MAF) sensor.
6. Erase DTC memory. Go to «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, ERASING»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb__diagnostic-trouble-code-dtc-memory-erasing) .
7. Perform a road test. Observe safety precautions. Go to «SAFETY PRECAUTIONS»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__safety-precautions) .
8. DTC memory checked. Go to «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) .

Throttle valve control module, cleaning

1. Clean air guide in throttle valve control module using a lint-free cloth and petroleum spirits.
2. Adapt throttle valve control module anew. Go to «THROTTLE VALVE CONTROL MODULE -J338-, ADAPTING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__throttle-valve-control-module-j338-adapting) .
3. Erase DTC memory. Go to «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, ERASING»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb__diagnostic-trouble-code-dtc-memory-erasing) .
4. Perform a road test. Observe safety precautions. Go to «SAFETY PRECAUTIONS»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__safety-precautions) .
5. DTC memory checked. Go to «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) .

Angle sensors for throttle drive -G187- and -G188-, checking

Special tools and workshop equipment required

1. V.A.G 1526 A Multimeter
2. V.A.G 1594 A Connector test kit
3. V.A.G 1598/31 Test box
4. VAS 5051
5. VAS 5051/1 adapter

Angle sensor 1 for throttle drive (power accelerator activation) -G187- and angle sensor 1 for throttle drive (power accelerator activation) -G188- inform the Engine Control Module (ECM) about the position of the throttle valve. Both angle sensors are located in the throttle valve control module.

1. Connect vehicle diagnostic, testing and information system VAS 5051. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Ignition must be switched on.
2. Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS 5051

Scheme 78

1 - Enter display group

1. Enter "062" for "display group number 062" in field -2- and confirm entry by pressing -Q- button.

Display on VAS 5051

Scheme 79

1. Check specifications for electronic throttle potentiometer voltages in display fields -1- and -2-.

DISPLAY GROUP 062: ELECTRONIC THROTTLE POTENTIOMETER VOLTAGES

Note. The Engine Control Module (ECM) converts and displays the voltage readings from the angle sensors as percentages of 5 V. (A 5 Volt supply corresponds to 100%).

1. Observe readouts in display fields 1 and 2.
2. Slowly depress accelerator pedal. Percentage displayed in field 1 should rise evenly. Tolerance range from 3..0.93% is not fully utilized. Percentage displayed in field 2 should fall evenly. Tolerance range from 97..0.3% is not fully utilized.

Note. The reason why the value indicated in display field 1 climbs, while the value indicated in display field 2 decreases, has to do with the fact that the potentiometers (angle sensors) in the Throttle Valve Control Module -J338- run in opposite directions. This means that the voltage of angle sensor 1 runs from 0 to 5 volts. (The more the throttle valve is opened, the larger the voltage; percent indication climbs). The voltage of angle sensor 2 runs from 5 to 0 volts. (The more the throttle valve is opened, the lower the voltage; the percentage decreases).

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

If the displays are not as described

1. Check Throttle Valve Control Module -J338- voltage supply and wiring. Go to «CHECKING VOLTAGE SUPPLY TO THROTTLE VALVE CONTROL MODULE -J338»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__checking-voltage-supply-to-throttle-valve) . Pay particular attention to connectors, which may be disconnected or corroded.
2. Check Throttle Position (TP) sensor 2 -G185-. Go to «THROTTLE POSITION (TP) SENSOR 1 -G79- AND THROTTLE POSITION SENSOR 2 -G185-, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__throttle-position-tp-sensor-1-g79) .

Checking voltage supply to Throttle Valve Control Module -J338

1. Disconnect connector from Throttle Valve Control Module -J338-.
2. Switch ignition on.
3. Connect multimeter as follows to measure voltage

THROTTLE VALVE CONTROL MODULE: CONNECTOR TERMINAL 2 + GROUND & 2 + 6

If the specified values are not obtained

Checking wire connections

1. Disconnect connector from Throttle Valve Control Module -J338-.
2. Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect Engine Control Module (ECM). See «Electrical testing using VAG1598/31 test box»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
3. Check for open circuit, short to ground (GND), or short to positive (B+) in following wiring connections: THROTTLE VALVE CONTROL MODULE: CONNECTOR TERMINALS 1 - 6 & SOCKETS 92, 83, 117, 84, 118, 91 Connector terminal Test box V.A.G 1598/31 Socket 1 92 2 83 3 117 4 84 5 118 6 91
4. Repair any open/short circuit as necessary.

If no malfunctions are found in wires

1. Replace Throttle Valve Control Module -J338-.

Throttle Position (TP) sensor 1 -G79- and Throttle Position sensor 2 -G185-, checking

Special tools and workshop equipment required

1. V.A.G 1526 A Multimeter
2. V.A.G 1594 A Connector test kit
3. V.A.G 1598/31 Test box
4. VAS 5051
5. VAS 5051/1 Adapter

Both the Throttle Position (TP) sensor 1 -G79- and the Throttle Position sensor 2 -G185- are located at the accelerator pedal and communicate the driver's intentions to the ECM completely independently of each other. Both sensors are stored in one housing.

1. Connect vehicle diagnostic, testing and information system VAS 5051. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection.

When doing this the ignition must be switched on.

Display on VAS 5051

Scheme 80

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

Display on VAS 5051

Scheme 81

1 - Enter display group

1. Enter "062" for "display group number 062" in field -2- and confirm entry by pressing -Q- button.

Display on VAS 5051

Scheme 82

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

DISPLAY GROUP 062: ELECTRONIC THROTTLE POTENTIOMETER VOLTAGES

Note. The Engine Control Module (ECM) converts and displays the voltage readings from the angle sensors as percentages of 5 V. (A 5 Volt supply corresponds to 100%).

1. Observe readouts in display fields 3 and 4.
2. Slowly depress accelerator pedal. Percentage displayed in field 3 should rise evenly. Tolerance range from 12..0.97% is not fully utilized. Percentage displayed in field 4 should also rise evenly. Tolerance range from 4...49% is not fully utilized.

Note. The value displayed in field 3 must always be about twice as large as that in field 4.

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

If the displays are not as described

1. Check Throttle Position (TP) Sensor 2 -G185- voltage supply and wiring. Go to «VOLTAGE SUPPLY FOR THROTTLE POSITION SENSORS -G79- AND -G185-, CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb) .

Scheme 83

1. Remove driver's storage compartment: See «DRIVER-SIDE STORAGE COMPARTMENT (WITH AND WITHOUT KNEE BOLSTER), ASSEMBLY OVERVIEW»(ref-197206-S03507421422005101300000) and for Cabriolet «DRIVER'S STORAGE COMPARTMENT (VEHICLES WITH AND WITHOUT KNEE BOLSTER), ASSEMBLY OVERVIEW»(ref-197209-S29048734852005101300000) .
2. Disconnect connector for Throttle Position sensors.
3. Switch ignition on.
4. Connect multimeter as follows to measure voltage: THROTTLE POSITION SENSOR VOLTAGE REFERENCE Connector terminal Specified value 1 + ground (GND) approx. 5 V 1 + 5 approx. 5 V 2 + ground (GND) approx. 5 V 2 + 3 approx. 5 V
5. Additionally check signal wires.

If the specified values are not obtained

Scheme 84

1. Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module; do not connect Engine Control Module. Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
2. Check for open circuit and short to positive (B+) or ground (GND) in following wiring connection: THROTTLE POSITION SENSOR WIRING CONNECTION REFERENCE Connector terminal Test box V.A.G 1598/31 Socket 1 72 2 73 3 36 4 35 5 33 6 34
3. Repair any open/short circuit as necessary.

If no malfunction is found in wires

1. Replace accelerator pedal position sensor(s). See «ACCELERATOR PEDAL MODULE WITH THROTTLE POSITION (TP) SENSORS, REMOVING AND INSTALLING»(/audi/a4/b7-2004-2009/remont/fuel-system/#fuel-supply-generic-scan-tool-18l-5v-turbo-amb__accelerator-pedal-module-with-throttle-position) .

Kick-down function, adapting

Note. If Throttle Position Sensor -G185- or Engine Control Module (ECM) is replaced kick-down function must be adapted on vehicles with automatic transmission.

1. VAS 5051
2. VAS 5051/1 Adapter

1. No DTCs recorded in DTC memory; check DTC memory. Go to «DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) .
2. Engine stopped, ignition switched on

1. Connect VAS 5051 scan tool. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection.

When doing this the ignition must be switched on.

Display on VAS 5051 scan tool

Scheme 85

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

Display on VAS 5051

Scheme 86

1 - Enter display group

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

Display on VAS 5051

Scheme 87

1. Activate basic setting by pressing -A- button. NOTE: There will be a prompt: "Activate kick-down".
2. Depress accelerator pedal completely, past kick-down point, and hold down. NOTE: During the kick-down point adaptation process, "Kick-down ADP running" is shown on the display. After successful adaptation of the kickdown point "Kick-down ADP OK" appears on the display.
3. Check indication in display field -4-.

DISPLAY GROUP 063: ADAPTING KICK-DOWN FUNCTION

Note. "ADP" in display field 4 stands for adaptation. "ERROR" may be displayed, if accelerator pedal is not pressed immediately when instructed by tester, or if accelerator pedal was released while adaptation was already running but process was not yet complete. In both cases exit "basic setting" mode and carry out adaptation again. Go to KICK-DOWN FUNCTION, ADAPTING .

Brake Light Switch -F- and Brake Pedal Switch -F47

Special tools and workshop equipment required

1. V.A.G 1526 A Multimeter
2. V.A.G 1527 B LED voltage tester
3. V.A.G 1594 A Connector test kit
4. V.A.G 1598/31 Test box
5. VAS 5051
6. VAS 5051/1 Adapter

Note. Command from Throttle Position Sensor 2 -G185- (potentiometer) to Engine Control Module (ECM) for opening throttle valve is suppressed for safety reasons when brake is pressed. To do so the brake light signal and also the Brake Pedal Switch -F47- signal are required in the ECM. If the brakes are operated when the accelerator pedal is held at a constant position the engine is immediately reduced to idling speed. Incorrectly adjusted switches may lead to unwanted regulating actions.

1. Connect VAS 5051 scan tool. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection.

When doing this the ignition must be switched on.

Display on VAS 5051

Scheme 88

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

Display on VAS 5051 scan tool

Scheme 89

1 - Enter display group

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

Display on VAS 5051 scan tool

Scheme 90

1. Check Brake Light Switch -F- / Brake Pedal Switch -F47- in display field -2-.

DISPLAY GROUP 066: SIGNALS TO ENGINE CONTROL MODULE (ECM)

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

If the display is not as described

Scheme 91

1. Remove driver's storage compartment: See «DRIVER-SIDE STORAGE COMPARTMENT (WITH AND WITHOUT KNEE BOLSTER), ASSEMBLY OVERVIEW»(ref-197206-S03507421422005101300000) and for Cabriolet «DRIVER'S STORAGE COMPARTMENT (VEHICLES WITH AND WITHOUT KNEE BOLSTER), ASSEMBLY OVERVIEW»(ref-197209-S29048734852005101300000) .
2. Disconnect connector from Brake Light Switch -F- / Brake Pedal Switch -F47- -2-.
3. Connect multimeter between terminals 1 and 4 to measure resistance. Specified value: INFINITY ohms (no continuity)
4. Press brake pedal. Specified value: approx. 0 ohms
5. Connect multimeter between terminals 2 and 3 to measure resistance. Specified value: approx. 0 ohms
6. Press brake pedal. Specified value: INFINITY ohms (no continuity)

If the specified values are not obtained

1. Replace Brake Light Switch -F- / Brake Pedal Switch -F47-. See «BRAKELIGHT SWITCH»(ref-160674-S41202058812004022300000) .

If specifications are obtained

Scheme 92

1. Connect voltage tester V.A.G 1527 B as follows: BRAKE LIGHT AND BRAKE PEDAL SWITCH: MEASURING CONNECTOR TERMINAL 1 Connector terminal Measure to 1 Car body ground (GND) point LED should light up. BRAKE LIGHT AND BRAKE PEDAL SWITCH: MEASURING CONNECTOR TERMINAL 3 Connector terminal Measure to 3 Car body ground (GND) point
2. Switch ignition on. LED should light up.

If the LED does not light up

1. Check wiring for open circuit and repair if needed.

If the LED lights up

Scheme 93

1. Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect Engine Control Module (ECM). Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
2. Check for open circuit and short to positive or ground (GND) in following wiring connections: BRAKE LIGHT AND BRAKE PEDAL SWITCH ACTIVATION: CONNECTOR TERMINAL 2, 4 & SOCKET 55, 56 Connector terminal Test box V.A.G 1598/31 Socket 2 55 4 56
3. Repair any open/short circuit as needed.

Clutch Vacuum Vent Valve Switch -F36-, checking

Special tools and workshop equipment required

1. V.A.G 1526 A Multimeter
2. V.A.G 1527 B LED voltage tester
3. V.A.G 1594 A Connector test kit
4. V.A.G 1598/31 Test box
5. VAS 5051
6. VAS 5051/1 Adapter

Note. This signal helps prevent excessive RPM oscillations and tip-in shocks when clutch is disengaged and is required for the cruise control system.

1. Connect VAS 5051 scan tool. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection.

When doing this the ignition must be switched on.

Display on VAS 5051 scan tool

Scheme 94

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

Display on VAS 5051

Scheme 95

1 - Enter display group

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

Display on VAS 5051

Scheme 96

1. Check indication in display field -2-.

DISPLAY GROUP 066: SIGNALS TO ENGINE CONTROL MODULE (ECM)

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

If indications do not resemble description

Scheme 97

1. Remove driver's storage compartment: See «DRIVER-SIDE STORAGE COMPARTMENT (WITH AND WITHOUT KNEE BOLSTER), ASSEMBLY OVERVIEW»(ref-197206-S03507421422005101300000) and for Cabriolet «DRIVER'S STORAGE COMPARTMENT (VEHICLES WITH AND WITHOUT KNEE BOLSTER), ASSEMBLY OVERVIEW»(ref-197209-S29048734852005101300000) .
2. Disconnect connector from Clutch Vacuum Vent Valve Switch -F36-.
3. Connect multimeter between terminals 2 and 3 to measure resistance. Specified value: approx. 0 ohms
4. Operate clutch pedal. Specified value: INFINITY ohms (no continuity)

If specified value is not obtained

1. Replace Clutch Vacuum Vent Valve Switch -F36-.

If specified value is obtained

Scheme 98

1. Connect voltage tester V.A.G 1527 B as follows: CLUTCH VACUUM VENT VALVE SWITCH VOLTAGE SUPPLY: MEASURING CONNECTOR TERMINAL 3 Connector terminal Measure to 3 Car body ground (GND) point
2. Switch ignition on. LED must light up.

If the LED does not light up

1. Check wiring for open circuit and service if necessary.

If the LED lights up

Scheme 99

1. Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect directly to Engine Control Module (ECM). Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
2. Check for open circuit and short to positive (B+) or ground (GND) in following wiring connection: CLUTCH VACUUM VENT VALVE SWITCH ACTIVATION: CONNECTOR TERMINAL 2 & SOCKET 39 Connector terminal Test box V.A.G 1598/31 Socket 2 39
3. Repair any open/short circuit as necessary.

Cruise Control System (CCS) switch -E45-, testing

Special tools and workshop equipment required

1. V.A.G 1526 A Multimeter
2. V.A.G 1594 A Connector test kit
3. V.A.G 1598/31 Test box
4. VAS 5051
5. VAS 5051/1 Adapter

The cruise control system (CCS) has no components of its own (except for the operating switch -E45-). All cruise control functions are carried out by the Engine Control Module (ECM).

1. Connect VAS 5051 scan tool. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection.

When doing this the ignition must be switched on.

Display on VAS 5051

Scheme 100

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

Display on VAS 5051

Scheme 101

1 - Enter display group

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

Display on VAS 5051

Scheme 102

1. Check indication in display field -2-.
2. Road test vehicle to check switch positions as shown in display field -4-.

DISPLAY GROUP 066: SIGNALS TO ENGINE CONTROL MODULE (ECM)

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

If "0" appears in display field 2 even with activated CCS

1. Connect V.A.G 1598/31 test box to wiring harness for Engine Control Module (ECM) and also directly to Engine Control Module. Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
2. Connect multimeter as follows to measure voltage: CRUISE CONTROL SYSTEM SWITCH: MEASURING VOLTAGE OF SOCKET 38 Test box V.A.G 1598/31 Socket Measure to 38 Engine ground (GND)
3. Switch ignition on. Specification for CCS switched off: 0 V Specification for CCS switched on: approx. battery voltage (B+)

If the specified value is not obtained

1. Check for open circuit and short to positive (B+) or ground (GND) in following wiring connections: CRUISE CONTROL SYSTEM SWITCH: SOCKET 38 WIRING CONNECTIONS REFERENCE Test box V.A.G 1598/31 Socket Steering Column Electronic Systems Control Module -J527- terminal 38 See appropriate System Wiring Diagram article.
2. Repair any open/short circuit as needed.

Significance of 8-digit display in display field 4

DISPLAY FIELD 4, 8-DIGIT DISPLAY REFERENCE (CRUISE CONTROL SWITCH)

If specifications in display field 4 are not obtained

1. Check CCS switch -E45-.

Scheme 103

1. V.A.G 1526 A Multimeter
2. V.A.G 1527 B LED voltage tester
3. V.A.G 1594 A Connector test kit
4. V.A.G 1598/31 Test box
5. VAS 5051
6. VAS 5051/1 Adapter

Vehicles with automatic transmission

Note. The signal is generated by the engine speed (RPM) sensor -G28- processed in the Engine Control Module (ECM) and directed to various parts of the electronic system (e.g. control module for A/C or ABS / EDS) from terminal 37 of the ECM. Engine speed signal and wire connections are monitored by these systems.

Checking engine speed (RPM) sensor -G28-. Go to ENGINE SPEED (RPM) SENSOR -G28-, CHECKING .

1. Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect Engine Control Module (ECM). Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
2. Check for open circuit and short to positive (B+) or ground (GND) in following wiring connections: SOCKET 37 WIRING CONNECTIONS REFERENCE Test box V.A.G 1598/31 Socket Instrument cluster: terminal 37 See appropriate System Wiring Diagrams article.
3. Repair any open/short circuit as needed.
4. Checking CAN bus. Go to «DATA EXCHANGE, MOTRONIC / ABS (CAN - BUS), CHECKING»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__data-exchange-motronic-abs-can-bus) .

Crash signal, checking

The Engine Control Module (ECM) receives the crash signal ("Crash cut-off was triggered") from the airbag control module.

The airbag control module sends the crash signal to the Engine Control Module (ECM) (during an accident or if a Output Diagnostic Test Mode (DTM) is carried out relating to the airbag system), the ECM switches off the fuel pump. This means that the engine will stop running but can be started again afterward (e.g. to remove vehicle from danger).

1. Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect test box directly to Engine Control Module (ECM). Go to «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b7-2004-2009/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
2. Check for open circuit and short to positive (B+) or ground (GND) in following wiring connections: SOCKET 67 WIRING CONNECTIONS REFERENCE Test box V.A.G 1598/31 Socket Airbag Control Module -J234- terminal 67 See appropriate System Wiring Diagrams article.
3. Repair any open/short circuit as necessary. See appropriate System Wiring Diagram article. If no problems with wires are found
4. Check DTC memory of Airbag Control Module -J234-.

Data exchange, Motronic / ABS (CAN-bus), checking

Note. Data exchange between individual control modules occurs via a bus system. The term "bus" refers to a system that transports and distributes data. The wire connections between the control modules, via which data is transferred, are referred to as data wires. Data is transferred to the connected control modules serially (one after the other) across the data wires.

Checking the bus system

The DTC table suggested checking the data exchange between the Engine / Transmission / ABS control modules.

1. Check whether correct engine, transmission (if installed) and ABS control modules are installed in this vehicle (part numbers) and whether coding is appropriate for control modules. (Refer to indicated ID codes for control modules).
2. Connect VAS 5051. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection.

Display on VAS 5051

Scheme 104

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

Display on VAS 5051

Scheme 105

1 - Enter display group

Note. The measured value blocks 125 and 126 indicate CAN drive users.

1. Enter "125" for "display group number 125" in field -2- and confirm entry by pressing -Q- button.

Display on VAS 5051

Scheme 106

1. Check displays in fields -1- to -4-. CAN-bus compatible control modules are displayed with the Engine Control Module: No display: Engine Control Module not CAN-compatible Display 1: CAN-compatible control module is a data bus user Display 0: CAN able control module is not user of the Databus
2. To switch to display group 126 press up button.
3. Check in same way with display group 126.
4. To switch to display group 127 press up button.
5. Check in same way with display group 127.
6. Exit function "08 - Read measured value block" by pressing < button.

Display on VAS 5051

Scheme 107

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

Display on VAS 5051

Scheme 108

1. Under -1- select diagnostic function "02 - Check DTC memory - Total system". The DTC memory is then checked for all systems in the vehicle which are capable of On Board Diagnostic (OBD). If a control module answers with its identification, the number of DTCs stored or "No DTCs detected" appears on the display.

Any system DTCs that are stored are displayed successively. The VAS 5051 will then transmit the next address word.

If a DTC is displayed relating to "Data bus drive" or "...CAN bus"

1. Check that Engine Control Module (ECM) and other CAN-compatible control modules installed are suitable for this vehicle (part no. and code).
2. Check that multiple connectors for control modules are properly seated.
3. Check CAN bus system.

The following systematic procedure is useful for troubleshooting if three or more control modules are communicating via a "two-line bus system"

1. Evaluate DTCs stored in control modules. NOTE: This analysis will help you locate the cause of the line malfunction.

Example 1

The DTCs stored in the DTC memory indicate that the control module 1 does not communicate with control modules 2 and 3.

Scheme 109

CONTROL MODULE 1 DOES NOT COMMUNICATE WITH CONTROL MODULES 2 AND 3 (EXAMPLE 1)

1. Switch ignition off.
2. Disconnect control modules connected across bus wires and check bus wires for an open circuit. See appropriate System Wiring Diagram article.
3. Replace control module 1 if no malfunctions can be found in bus wires.

Example 2

From the DTCs stored in the memories, you have determined that control module 2 is not communicating with control modules 1 and 3.

Scheme 110

CONTROL MODULE 2 IS NOT COMMUNICATING WITH CONTROL MODULES 1 AND 3 (EXAMPLE 2)

1. Switch ignition off.
2. Disconnect control modules connected across bus wires and check bus wires for an open circuit. See appropriate System Wiring Diagram article.
3. Replace control module 2 if no malfunctions can be found in bus wires.

Example 3

Using the DTCs stored in the memories, you have determined that none of the control modules are sending or receiving signals.

CONTROL MODULES COMMUNICATION REFERENCE (EXAMPLE 3)

1. Switch ignition off.
2. Disconnect control modules connected across bus wires and check for a short circuit between bus wires.

See appropriate System Wiring Diagram article.

1. Vehicle diagnosis, measurement and information system VAS 5051 connected and vehicle self-diagnosis selected. Go to «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b7-2004-2009/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) .

All control modules that use the CAN-bus are still disconnected.

The ignition is switched off.

1. Connect one of control modules.
2. Switch ignition on.
3. Press appropriate vehicle system in selection -1-.
4. Check DTC memory of control module you just connected and erase it.
5. Press < button.
6. Press diagnostic function "06 - End Output" in selection -1-.

1. Switch ignition off and on again.
2. Leave ignition switched on for 10 seconds. Then read DTC memory of control module you just connected using Scan Tool (ST).
3. If DTC "Powertrain CAN-bus malfunction" is displayed, replace control module you just connected.
4. If DTC "Powertrain CAN-bus malfunction" is not displayed, connect next control module and repeat procedure.

VACUUM HOSE DIAGRAM(S)

Note. The following list refers to see scheme 205.

1. Mechanical recirculation valve
2. Wastegate Bypass Regulator Valve -N75
3. Pressure regulator valve for crankshaft housing ventilation
4. Secondary Air Injection (AIR) Pump Motor -V101
5. Air filter with Mass Air Flow (MAF) Sensor -G70
6. Check-valve Installation position: Arrow on valve points in direction of flow, as shown in illustration.
7. to EVAP canister
8. Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80
9. Turbocharger
10. Combination valve for secondary air injection (AIR)
11. To brake booster
12. Check-valve Installation position: Arrow on valve points in direction of flow, as shown in illustration.
13. Check-valve Installation position: Arrow on valve points in direction of flow, as shown in illustration.
14. Crankshaft housing ventilation
15. Vacuum reservoir Component location: Under wheel housing liner in front left wheel housing
16. Check-valve Installation position: Arrow on valve points in direction of flow, as shown in illustration.
17. Secondary Air Injection (AIR) Solenoid Valve -N112- Component location: Below intake manifold
18. to Leak detection pump (LDP) -V144
19. Check-valve Installation position: Arrow on valve points in direction of flow, as shown in illustration.
20. Charge air cooler with Charge Air Pressure Sensor -G31
21. Recirculating valve for turbocharger -N249- Component location: Below intake manifold
22. Vacuum diaphragm for boost pressure regulation When the combination valve is opened, the mechanical boost pressure regulation valve in the turbocharger is opened and secondary air is thereby channeled past the turbocharger directly to the catalytic converter

Note. The following list refers to see scheme 206.

1. Resonator
2. Mechanical recirculation valve
3. Secondary Air Injection (AIR) Pump Motor -V101
4. Wastegate Bypass Regulator Valve -N75
5. Air filter with Mass Air Flow (MAF) Sensor -G70
6. Check-valve Installation position: Arrow on valve points in direction of flow, as shown in illustration.
7. to EVAP canister
8. Evaporative Emission (EVAP) Canister Purge Regulator Valve -N80
9. Turbocharger
10. Pressure regulator valve for crankshaft housing ventilation
11. Combination valve for secondary air injection (AIR)
12. Check-valve for EVAP canister Installation position: Arrow on valve points in direction of flow, as shown in illustration.
13. To brake booster
14. Vacuum suction jet pump
15. Check-valve Installation position: Arrow on valve points in direction of flow, as shown in illustration.
16. Crankshaft housing ventilation
17. Vacuum reservoir Component location: Under wheel housing liner in front left wheel housing
18. Check-valve Installation position: Arrow on valve points in direction of flow, as shown in illustration.
19. to Leak detection pump (LDP) -V144
20. Check-valve Installation position: Arrow on valve points in direction of flow, as shown in illustration.
21. Secondary Air Injection (AIR) Solenoid Valve -N112- Component location: Below intake manifold
22. Charge air cooler with Charge Air Pressure Sensor -G31
23. Recirculating valve for turbocharger -N249- Component location: Below intake manifold
24. Vacuum diaphragm for boost pressure regulation When the combination valve is opened, the mechanical boost pressure regulation valve in the turbocharger is opened and secondary air is thereby channeled past the turbocharger directly to the catalytic converter

See also:
• MALFUNCTION INDICATOR LAMP (MIL) -K83- IN INSTRUMENT CLUSTER
• SECONDARY AIR COMBINATION VALVE, REMOVING AND INSTALLING
• ENGINE COOLANT TEMPERATURE (ECT) SENSOR -G62-, CHECKING
• ENGINE SPEED (RPM) SENSOR -G28-, CHECKING
• MOTRONIC ENGINE CONTROL MODULE (ECM) POWER SUPPLY, CHECKING
• INTAKE AIR TEMPERATURE (IAT) SENSOR -G42-, CHECKING
• CAMSHAFT POSITION (CMP) SENSOR -G40-, CHECKING
• DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING
• ENCODING II ENGINE CONTROL MODULE (ECM)
• CRUISE CONTROL SYSTEM, ACTIVATING/DEACTIVATING
• FUEL PUMP (FP), ELECTRICAL TESTING
• FUEL TANK WITH ATTACHMENTS - COMPONENT OVERVIEW
• OUTPUT DIAGNOSTIC TEST MODE (DTM)
• DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, ERASING
• ACCELERATOR PEDAL MODULE WITH THROTTLE POSITION (TP) SENSORS, REMOVING AND INSTALLING
• Location of Fuel Pump (FP) Relay -J17
• ELECTRONIC POWER CONTROL (EPC) WARNING LAMP -K132- IN INSTRUMENT CLUSTER
• FUEL TANK VENTILATION SYSTEM, CHECKING
• OXYGEN SENSOR (O2S) AND OXYGEN SENSOR CONTROL BEFORE THREE WAY CATALYTIC CONVERTER (TWC), CHECKING
• Location of Secondary Air Injection (AIR) Solenoid Valve -N112- and Recirculating valve for turbocharger -N249
• Location
• Location of Engine Control Module (ECM) in electronics box (plenum chamber)
• Component locations in electronics box (plenum chamber)
• PROCEDURE AFTER INTERRUPTION OF VOLTAGE SUPPLY
• ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING
• THROTTLE VALVE CONTROL MODULE -J338-, CHECKING
• THROTTLE VALVE CONTROL MODULE -J338-, ADAPTING
• MASS AIR FLOW (MAF) SENSOR -G70-, CHECKING
• FUEL PUMP (FP) RELAY -J17- AND RELAY ACTIVATION, CHECKING
• ENGINE CONTROL MODULE (ECM) (WITH METAL ANTI-THEFT HOUSING), REPLACING
• The following operations must be carried out after installing the Engine Control Module
• If the idle is too high or too low and there are no DTCs recorded in the DTC memory, perform the following tests
• Significance of 5 digit indication of display group 056
• INTAKE AIR SYSTEM FOR LEAKS (UNMETERED AIR), CHECKING
• ELECTRICAL TESTING USING VAG1598/31 TEST BOX
• FUEL SYSTEM, BLEEDING
• Loosening and tightening union nut for fuel supply line in vehicles as of 07.03
• System pressure, fuel pressure regulator and residual pressure, checking
• CHECKING VOLTAGE SUPPLY OF FUEL PUMP AND COMPONENTS
• COMPONENT LOCATIONS, OVERVIEW
• EVALUATION OF DISPLAY GROUP 002
• WIRING TO MASS AIR FLOW (MAF) SENSOR -G70-, CHECKING
• RULES FOR CLEANLINESS
• CHECKING OXYGEN SENSOR (O2S) ADAPTATION VALUES AND OXYGEN SENSOR (O2S) CONTROL
• EVALUATING DISPLAY GROUP 032
• (Cont.)
• EVALUATING DISPLAY GROUP 033
• Evaluating display group 037
• DATA EXCHANGE, MOTRONIC / ABS (CAN - BUS), CHECKING
• Location of Charge Air Pressure Sensor -G31
• WORK PROCEDURE
• SAFETY PRECAUTIONS
• CHECKING VOLTAGE SUPPLY TO THROTTLE VALVE CONTROL MODULE -J338
• THROTTLE POSITION (TP) SENSOR 1 -G79- AND THROTTLE POSITION SENSOR 2 -G185-, CHECKING
• KICK-DOWN FUNCTION, ADAPTING
• SIGNIFICANCE OF 8-DIGIT DISPLAY IN DISPLAY FIELD 4