4.2l v8 4v Generic Scan Tool, Engine Code(s): Bvj Audi A6 C6 рестайлинг

Fuel Supply System

> Safety Precautions

> Clean Working Conditions

> Fuel Pump Electrical Test

> Fuel Pump Delivery Quantity, Checking

For all fuel supply system component locations. Refer to --> 20 - FUEL SUPPLY

For all fuel supply system removal/installation procedures and torque specifications. Refer to --> 20 - FUEL SUPPLY

Check the Technical Bulletins for information that may supersede any information included in this article.

Note. All manufacturers special tools as well as common tools may contain a manufacturer specific part number. These tools may be substituted with an equivalent aftermarket tool or are available for purchase through Audi. Manufacturers special tools as well as common tools that contain a manufacturer specific part number may be referenced in the test procedure illustrations showing the tool use or installation. If the manufacturer specific tool is not being used, an equivalent aftermarket tool may be installed in the same manner as the manufacturers special tool. The manufacturers test box Test Box 105 Pin VAG1598/42 is available for purchase or rental.

Safety Precautions

Perform the following steps before beginning work on the fuel supply system

1. Disconnect the battery Ground (GND) cable with the ignition switched off --> «27 - STARTER, GENERATOR, CRUISE CONTROL»(/audi/a6/c6-2008-2011/remont/cruise-control-systems/#electrical-equipment) .
2. Open the fuel filler flap briefly and then close again.

When removing and installing components from full or partially full fuel tanks, observe the following

1. The fuel tank must only be partially full. How much fuel can remain in the fuel tank may be read in the respective work description. Empty the fuel tank if necessary.
2. Before starting work, switch on the exhaust extraction system and place an extraction hose close to the installation opening of the fuel tank to extract escaping fuel fumes. If no exhaust extraction system is available, a radial fan (as long as motor is not in air flow) with a displacement greater than 15 m 3 /h can be used.
3. Prevent fuel from contacting the skin! Wear fuel-resistant gloves!

Clean Working Conditions

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

1. Thoroughly clean all connections and the surrounding area before disconnecting.
2. Place parts that have been removed on a clean surface and cover them. Do not use fluffy cloths!
3. Carefully cover over opened components or seal, if repairs are not performed immediately.
4. Only install clean components: Only unpack replacement parts immediately prior to installation. Do not use parts that have been stored unpacked (e.g. in tool boxes etc.).

1. When the system is open: Do not work with compressed air. Do not move vehicle unless absolutely necessary.

Fuel Pump Electrical Test

Special tools, testers and auxiliary items required

1. Hand held remote control (jumper).
2. Multimeter.
3. Electrical connector test lead set.

Test conditions

1. Battery voltage min. 12.5 V.
2. Fuel filter OK.
3. Fuse SC1 OK.
4. Fuel Pump (FP) Control Module J538 OK. Refer to --> «20 - FUEL SUPPLY»(/audi/a6/c6-2008-2011/remont/fuel-system/#fuel-supply-system) .

1. Fuel tank at least 1 / 4 filled.
2. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear seat bench --> «72 - SEAT - FRAMES»(ref-281387-S01246441392008031100000) .

Scheme 857

1. Remove the screws - arrows - and the right locking flange.

Scheme 858

1. Disconnect fuel delivery unit electrical harness connector - arrow -.
2. Connect a Hand held remote control (jumper) to terminal - 1 - of the fuel delivery unit and to vehicle battery (+).

Scheme 859

1. Connect a jumper cable from a Electrical connector test lead set to terminal - 4 - of the fuel delivery unit and to vehicle Ground (GND).
2. Press the Hand held remote control (jumper) switch in.

Note. The Fuel Pump (FP) runs quietly. Avoid surrounding noises while testing the fuel pump.

The fuel pump should operate and an audible noise heard.

If no operating noise is heard

Scheme 860

1. Remove the fuel delivery unit. Refer to --> «20 - FUEL SUPPLY»(/audi/a6/c6-2008-2011/remont/fuel-system/#fuel-supply-system) .
2. Using a Multimeter , check the fuel delivery unit electrical terminals 1 to 4 for continuity.

Specified value: 0 ohms.

If the specified value is not obtained

1. Check the fuel delivery unit for damage, corrosion, lose or broken terminals.
2. Check the fuel delivery unit for an open circuit, short to Ground (GND), or short to Battery (+).
3. Repair the electrical circuit as necessary.

If no malfunction is detected in electrical circuit, replace the fuel delivery unit. Refer to --> 20 - FUEL SUPPLY .

Assembly is performed in the reverse order of removal.

Fuel Pump Delivery Quantity, Checking

Special tools, testers and auxiliary items required

1. Hand held remote control (jumper).
2. Electrical connector test lead set.
3. Fuel pressure test set (high pressure).
4. Measuring container, fuel-resistant.

Test conditions

1. Battery voltage 12.5 V.
2. Fuel filter OK.
3. Fuse SC1 OK.
4. Fuel Pump (FP) Control Module J538 OK. Refer to --> «20 - FUEL SUPPLY»(/audi/a6/c6-2008-2011/remont/fuel-system/#fuel-supply-system) .

1. Fuel tank at least 1 / 4 filled.
2. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear seat bench --> «72 - SEAT - FRAMES»(ref-281387-S01246441392008031100000) .

1. Remove the screws - arrows - and the right locking flange.

1. Disconnect fuel delivery unit electrical harness connector - arrow -.
2. Connect a Hand held remote control (jumper) to terminal - 1 - of the fuel delivery unit and to vehicle battery (+).

1. Connect a jumper cable from a Electrical connector test lead set to terminal - 4 - of the fuel delivery unit and to vehicle Ground (GND).
2. Remove the fuel filler cap from the fuel filler tube.

Scheme 861

1. Remove the rear engine cover - arrows -.

Scheme 862

1. Disconnect the fuel line at the fuel rail - arrow -.

Scheme 863

1. Connect a Fuel pressure test set (high pressure) to the fuel line.
2. Connect a hose - arrow - to pressure gauge and hold it in the measuring container.
3. Open the shutoff valve of the pressure gauge. The lever points in the direction of flow.
4. Press the switch of the remote control and slowly close the shutoff valve of the pressure gauge.

The fuel pressure should rise.

1. Specification: 6 BAR positive pressure.

1. Do not move the shutoff valve position.
2. Empty the measuring container.
3. Press the remote control switch in for 15 seconds.

Scheme 864

1. Compare the quantity of fuel delivered with the minimum delivery rate in the diagram (cm 3 /15s).

Note. Voltage at fuel pump with engine stopped and pump running is approx. 2 volts less than battery voltage.

If the minimum fuel delivery quantity is not obtained, the following malfunctions may be present

1. Fuel lines pinched. Check fuel lines for damage. Repair or replace as necessary. Refer to --> «20 - FUEL SUPPLY»(/audi/a6/c6-2008-2011/remont/fuel-system/#fuel-supply-system) .
2. Fuel filter clogged. Replace the fuel filter. Refer to --> «20 - FUEL SUPPLY»(/audi/a6/c6-2008-2011/remont/fuel-system/#fuel-supply-system) .
3. Fuel pump faulty. Check the fuel pump. Refer to --> «20 - FUEL SUPPLY»(/audi/a6/c6-2008-2011/remont/fuel-system/#fuel-supply-system)

Assembly is performed in the reverse order of removal.

1. Install fuel line and tighten the line to 28 Nm.

Torque specifications

Evaporative Emissions System

> EVAP System, Leak Detection

> EVAP System, Checking for Proper Seal

> EVAP Canister Purge Regulator Valve, Checking

> Leak Detection Pump, Checking

For all EVAP system component locations and hose routing. Refer to --> 20 - FUEL SUPPLY

For the EVAP system hose routing. Refer to --> 20 - FUEL SUPPLY

For all EVAP system removal/installation procedures and torque specifications. Refer to --> 20 - FUEL SUPPLY

Check the Technical Bulletins for information that may supersede any information included in this article.

Note. All manufacturers special tools as well as common tools may contain a manufacturer specific part number. These tools may be substituted with an equivalent aftermarket tool or are available for purchase through Audi. Manufacturers special tools as well as common tools that contain a manufacturer specific part number may be referenced in the test procedure illustrations showing the tool use or installation. If the manufacturer specific tool is not being used, an equivalent aftermarket tool may be installed in the same manner as the manufacturers special tool.

EVAP System, Leak Detection

Function

The leak detection system recognizes leaks in the complete fuel system, including the fuel tank, EVAP canister and Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.

On the mechanical side, the leak detection system consists mainly of a vacuum-driven diaphragm pump, that is equipped with a reed contact on the actuation rod of the pump diaphragm. The pump is supplied with vacuum by the engine intake stroke.

1. When leak detection is activated, the diaphragm pump pumps the fuel system up to 20 to 30 mbar. The pump membrane is then moved outward, thereby setting the reed contact at the actuation rod to the "open" position.
2. During leak diagnosis, the reed contact is monitored to check if it remains open within 15 seconds. This indicates the system is sealed.
3. If pressure falls (indicating a leak), the diaphragm moves back and the reed contact closes.
4. If reed contact closes within 15 seconds of leak detection time, a further test is performed: In this case the diaphragm pump pumps 4 times again. The engine control module (ECM) measures the time for each of the 4 pumps until the reed contact is closed again. From that, the control module can recognize a "small leak" (smaller than 1 mm in diameter) or a "large leak".

Leak diagnosis is activated automatically shortly following every engine start. If a malfunction is determined, an entry is made to the Diagnostic Trouble Code (DTC) memory. The Malfunction Indicator Lamp (MIL) K83 in the instrument cluster lights up if the malfunction is recognized for two subsequent starts.

EVAP System, Checking for Proper Seal

Special tools, testers and auxiliary items required

1. Smoke tester.
2. EVAP and Fuel Supply System Vacuum hose and line routing diagram.

Note. Secure all hose connections using hose clamps appropriate for the model type Replace seals and gaskets when performing repair work.

Leak checking

1. Using a Smoke tester , check the Evaporative Emission (EVAP) canister system for leaks.

Note. Always follow the manufacturers directions for the proper installation and operation of the Smoke tester being used.

If a leak is detected

1. Check the fuel filler cap seal for damage and for proper installation. Replace if necessary.
2. Check the seals under the locking flanges and the union nuts are properly tightened on the fuel tank.
3. Check all hose connections of the fuel supply system and replace or repair any leaking lines.
4. Check all hose connections of the EVAP system and replace or repair any leaking lines.

1. Repair or replace any damaged component.

If no leaks are found in the EVAP and Fuel Supply System

1. Erase the DTC memory if a DTC was set. Refer to --> «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
2. Perform a road test to verify repair.

If a DTC was set and does not return

Repair complete, Generate readiness code. Refer to --> Readiness Code .

1. End diagnosis.

If the DTC does return and no leaks are found in the EVAP and Fuel Supply System

1. Check the DTC memory for any DTC codes pertaining to the EVAP and Fuel Supply Systems. If a DTC is stored, perform the diagnostic test procedure for the suspected component.

End of procedure.

EVAP Canister Purge Regulator Valve, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SA5 OK.
2. The ignition switched off.

Note. Voltage for the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 is supplied by the Engine Component Power Supply Relay J757.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.

Scheme 865

1. Disconnect the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical harness connector - 2 -.

Checking internal resistance

Scheme 866

1. Using a Multimeter , check the resistance between terminals 1 and 2 of the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.

Specified value: 22,0 to 30,0 ohms.

If the specified value was not obtained

1. Replace the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.

If the specification is obtained

Checking voltage supply

Scheme 867

1. Using a Multimeter , check the electrical harness connector terminal 1 to 2 for voltage.
2. Crank the engine.

Specified value: battery voltage.

If the specified value was not obtained

1. Using a Multimeter , check the electrical harness connector terminal 1 to Ground (GND) for voltage.

1. Operate the starter briefly.

Specified value: battery voltage.

If the specified value was not obtained

1. Check the wiring connection from the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical harness connector terminal 1 to the Engine Component Power Supply Relay J757 terminal 2/87 for an open circuit or short to ground (GND).
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the wiring connection.

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical connector terminal 2 to the Engine Control Module (ECM) J623 electrical connector T94a terminal 9 for an open circuit.

Specified value: 1.5 ohms.

If the specification was not obtained

1. Check the wiring for a short circuit to Battery positive (+) or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the wiring connection.

If the specification was obtained

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.
2. End diagnosis and switch the ignition off.

Leak Detection Pump, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Fuse S282 fuse OK.
2. The ignition switched off.

Note. The voltage for the Leak Detection Pump (LDP) -V144- is supplied by the Engine Component Power Supply Relay J757.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove left rear wheel housing liner --> «66 - EXTERIOR EQUIPMENT»(ref-281388-S35527536922008031100000) .
2. Remove the Leak Detection Pump (LDP) -V144- nuts - arrows -.

Scheme 868

1. Remove the Leak Detection Pump (LDP) -V144- with bracket attached.

Scheme 869

1. Disconnect the Leak Detection Pump (LDP) V144 electrical harness connector - 3 -.

Checking internal resistance

Scheme 870

1. Using a Multimeter , check the Leak Detection Pump (LDP) V144 for resistance as follows

If any of the specifications were not obtained

1. Replace the Leak Detection Pump (LDP) -V144-. --> «20 - FUEL SUPPLY»(/audi/a6/c6-2008-2011/remont/fuel-system/#fuel-supply-system) .

If the specified values were obtained

Checking voltage supply

Scheme 871

1. Using a Multimeter , check the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 3 to Ground (GND) for voltage.

1. Operate the starter briefly.

Specified value: battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

1. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
2. Check the wiring connection from the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 3 to the Engine Component Power Supply Relay J757 terminal 2/87 for an open circuit or short to ground (GND).
3. If necessary, repair the faulty wiring connection.

It the specification was obtained.

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Leak Detection Pump (LDP) -V144- electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical harness connectors T94a terminals for an open circuit.

Specified value: 1.5 ohms.

If the specification is not obtained

1. Check the wiring for a short circuit to Battery positive (+) or an open circuit.
2. If necessary, repair the wiring connection.

If no malfunction is found in wiring

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

1. Install the left rear wheel housing liner --> «66 - EXTERIOR EQUIPMENT»(ref-281388-S35527536922008031100000) .

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Electronic Engine Power Control

> EPC System Function

> Throttle Position Sensor/Accelerator Pedal Position Sensor 2, Checking

EPC System Function

For "EPC" , the throttle valve is not operated by a cable from 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 Motronic Engine Control Module (ECM) J623 by Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 (variable resistances; stored in one housing) that are connected with the accelerator pedal.

The accelerator pedal position (drivers intention) is a main input unit for the Motronic Engine Control Module (ECM) J623.

Operation of the throttle valve occurs by an electric motor (Throttle Drive (for Electronic Power Control (EPC)) G186) in the Throttle Valve Control Module J338. This is true across the entire engine speed and engine load spectrum.

Throttle valve is operated by Throttle Drive (for Electronic Power Control (EPC)) G186 according to specifications of Motronic Engine Control Module (ECM) J623.

With engine off and ignition switched on, Motronic Engine Control Module (ECM) J623 controls the Throttle Drive (for Electronic Power Control (EPC)) G186 exactly according to specifications of Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185. This means, if the accelerator pedal is depressed half way, the Throttle Drive (for Electronic Power Control (EPC)) G186 opens the throttle valve to the same degree; i.e. throttle valve is then opened approx. half way.

With engine running (under load), Motronic Engine Control Module (ECM) J623 can open or close the throttle valve independently of Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185.

This means, for example, that the throttle valve could be fully opened even though the accelerator pedal has only been depressed half way. This has the advantage of preventing torque losses at the throttle valve.

In addition to this, it results in significantly better values relative to emissions and consumption under certain load conditions.

It would be incorrect to think that "EPC" consists of only one or two components. "EPC" is much more of a system containing all components that contribute to recognizing, controlling and monitoring the position of the throttle valve.

1. Observe safety precautions.
2. Observe rules for cleanliness.

Throttle Position Sensor/Accelerator Pedal Position Sensor 2, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram

Test requirement

1. The Motronic Engine Control Module (ECM) J623 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.

Note. Use only gold-plated terminals when servicing the electrical harness connector terminals in Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the drivers side storage compartment. Refer to --> «68 - INTERIOR EQUIPMENT»(ref-281387-S11612519082008031100000) .

Scheme 872

1. Disconnect the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 electrical harness connector - 2 -.

Checking voltage supply and wiring

1. Switch the ignition on.

Scheme 873

1. Using a Multimeter , check the following wiring connections for voltage.

1. Switch the ignition off.

If the specification is not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .
2. Using a Multimeter , check the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical connector T60a for an open circuit according to wiring diagram.

Specified value: 1.5 ohms max.

If the specification is not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and the voltage supply was OK

1. Replace the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185. --> «20 - FUEL SUPPLY»(/audi/a6/c6-2008-2011/remont/fuel-system/#fuel-supply-system) .

If no malfunction is detected in the wiring and if the voltage supply was not OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

1. Install the drivers side storage compartment. Refer to --> «68 - INTERIOR EQUIPMENT»(ref-281387-S11612519082008031100000) .

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Motronic Fuel Injection System, Servicing

> Safety Precautions

> Clean Working Conditions

> Technical Data

For all Motronic fuel injection system component locations. Refer to --> 24 - MULTIPORT FUEL INJECTION (MFI)

For all Motronic fuel injection system removal/installation procedures and torque specifications. Refer to --> 24 - MULTIPORT FUEL INJECTION (MFI)

Check the Technical Bulletins for information that may supersede any information included in this article.

Note. All manufacturers special tools as well as common tools may contain a manufacturer specific part number. These tools may be substituted with an equivalent aftermarket tool or are available for purchase through Audi. Manufacturers special tools as well as common tools that contain a manufacturer specific part number may be referenced in the test procedure illustrations showing the tool use or installation. If the manufacturer specific tool is not being used, an equivalent aftermarket tool may be installed in the same manner as the manufacturers special tool. The manufacturers test box Test Box 105 Pin VAG1598/42 is available for purchase or rental.

To reduce the risk of personal injury and/or damage to the fuel injection and ignition system. Note the following

1. Always switch off ignition before disconnecting or connecting lines of the fuel injection and ignition system, including test leads.
2. During some of the tests, a Diagnostic Trouble Code (DTC) may be recognized and stored by the control module. At the end of all tests and repairs, the DTC memory should be checked and, if necessary, erased. After erasing the DTC memory, a readiness code must be generated for the engine control module.
3. Always switch ignition off before cleaning engine.

Observe the following if test and measuring instruments are required during a test drive

Even minor contaminations can lead to malfunctions in the fuel injection system. When working on the fuel supply/injection system, pay careful attention to the following rules for cleanliness

1. Thoroughly clean all unions and adjacent areas with engine or brake cleaner and dry before disconnecting.
2. Plug open lines and connections immediately with appropriate protective caps.
3. Place removed parts on a clean surface and cover. Use lint-free cloths.
4. Install clean components: Remove replacement parts immediately prior to installation. Do not use parts that have been stored unpacked (e.g. in tool boxes etc.).

1. When the system is open: Do not work with compressed air. Do not move vehicle unless absolutely necessary.
2. Separated electrical connectors: Protect from dirt and moisture. Make sure connections are dry when reconnecting.

Technical Data

Components, Checking

> Oxygen Sensor Heater before Catalytic Converter, Checking

> Oxygen Sensor Heater after Catalytic Converter, Checking

> Mass Air Flow Sensor/Intake Air Temperature Sensor, Checking

> Throttle Valve Control Module, Checking

> Fuel Pressure Sensor, Checking

> Low Fuel Pressure Sensor, Checking

> Fuel Metering Valve, Checking

> Fuel Metering Valve, Checking

> Engine Speed Sensor, Checking

> Intake Flap Motor, Checking

> Variable Intake Manifold Runner Motor, Checking

> Intake Manifold Runner Position Sensor 1, Checking

> Intake Manifold Runner Position Sensor 2, Checking

> Fuel Injectors, Checking

Oxygen Sensor 1 Heater

Note. When servicing electrical harness connector terminals for the Heated Oxygen Sensor (HO2S) G39 , use only gold-plated terminals.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SA6 OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.
2. Remove the vacuum lines - 2 - , - 3 - and - arrows - from the air guide hose.
3. Disconnect the Mass Air Flow (MAF) Sensor G70 electrical harness connector - 1 -.

Scheme 874

1. Loosen the hose clamps - 4 - and - 5 - and remove the air guide hose.

Scheme 875

1. Disconnect the Heated Oxygen Sensor (HO2S) G39 electrical harness connector - 1 -.

Checking internal resistance

Scheme 876

1. Using a multimeter , check the Heated Oxygen Sensor (HO2S) G39 terminals 3 to 4 for resistance.

Specified value: 2.5 to 10.0 ohms (at approx. 20° C)

If the specification was not obtained

1. Replace Heated Oxygen Sensor (HO2S) G39. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specification was obtained

Checking voltage supply

Crank the engine.

Scheme 877

1. Using a multimeter , check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminal 4 to Ground (GND) for voltage.

Specified value: Battery voltage.

Switch the ignition off.

If the specification was not obtained

1. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
2. Check the wiring from the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminal 4 to the Engine Component Power Supply Relay J757 socket 2/87 for a short circuit to each other, Ground (GND), or an open circuit.
3. If necessary, repair the faulty wiring connection.

If the specification was obtained

Checking Ground (GND) activation

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a multimeter , check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a for an open circuit.

Specified value: 1.5 ohms max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), Ground (GND) or an open circuit.
2. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Oxygen Sensor 2 Heater

Note. When servicing electrical harness connector terminals for the Heated Oxygen Sensors , use only gold-plated terminals.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SA6 OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.
2. Remove coolant reservoir - arrow - and disconnect electrical connector on Engine Coolant Level (ECL) Warning Switch F66 at bottom of coolant reservoir.
3. Remove the screw - arrow - retaining the coolant reservoir.
4. Remove the coolant reservoir and disconnect the Engine Coolant Level (ECL) Warning Switch F66 electrical harness connector.

Scheme 878

1. Position the coolant reservoir aside with the coolant hoses - 1 through 3 - attached.

Scheme 879

1. Disconnect the Heated Oxygen Sensor (HO2S) 2 G108 electrical harness connector - 1 -.

Checking internal resistance

1. Using a multimeter , check the Heated Oxygen Sensor (HO2S) 2 G108 terminals 3 to 4 for resistance.

Specified value: 2.5 to 10.0 ohms (at approx. 20° C)

If the specification was not obtained

1. Replace Heated Oxygen Sensor (HO2S) 2 G108. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specification was obtained

Checking voltage supply

Crank the engine.

1. Using a multimeter , check the Heated Oxygen Sensor (HO2S) 2 G108 electrical harness connector terminal 4 to Ground (GND) for voltage.

Specified value: Battery voltage.

Switch the ignition off.

If the specification was not obtained

1. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
2. Check the wiring from the Heated Oxygen Sensor (HO2S) 2 G108 electrical harness connector terminal 4 to the Engine Component Power Supply Relay J757 socket 2/87 for a short circuit to each other, Ground (GND), or an open circuit.
3. If necessary, repair the faulty wiring connection.

If the specification was obtained

Checking Ground (GND) activation

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a multimeter , check the Heated Oxygen Sensor (HO2S) 2 G108 electrical harness connector to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a for an open circuit.

Specified value: 1.5 ohms max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), Ground (GND) or an open circuit.
2. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Oxygen Sensor 1

Note. When servicing terminals in harness connector of Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) use only gold-plated terminals.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SA7 OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.
2. Remove the vacuum lines - 2 - , - 3 - and - arrows - from the air guide hose.
3. Disconnect the Mass Air Flow (MAF) Sensor G70 electrical harness connector - 1 -.

1. Loosen the hose clamps - 4 - and - 5 - and remove the air guide hose.

1. Disconnect the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 electrical harness connector - 2 -.

Checking internal resistance

Scheme 880

1. Using a multimeter , check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 terminals 1 to 2 for resistance.

Specified value: 1.0 to 20.0 ohms (at approx. 20° C)

If the specification was not obtained

1. Replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specification was obtained

Checking voltage supply

Crank the engine.

Scheme 881

1. Using a multimeter , check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 electrical harness connector terminal 1 to Ground (GND) for voltage.

Specified value: Battery voltage.

Switch the ignition off.

If the specification was not obtained

1. Check the wiring from the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 electrical harness connector terminal 1 to the Engine Component Power Supply Relay J757 socket 2/87 for a short circuit to each other, Ground (GND) or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specification was obtained

Checking Ground (GND) activation

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a multimeter , check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 electrical harness connector to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a for an open circuit.

Specified value: 1.5 ohms max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
2. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Oxygen Sensor 2

Note. When servicing terminals in harness connector of Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) use only gold-plated terminals.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SA7 OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.
2. Remove coolant reservoir - arrow - and disconnect electrical connector on Engine Coolant Level (ECL) Warning Switch F66 at bottom of coolant reservoir.
3. Remove the screw - arrow - retaining the coolant reservoir.
4. Remove the coolant reservoir and disconnect the Engine Coolant Level (ECL) Warning Switch F66 electrical harness connector.

1. Position the coolant reservoir aside with the coolant hoses - 1 through 3 - attached.

1. Disconnect the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 electrical harness connector - 2 -.

Checking internal resistance

1. Using a multimeter , check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 terminals 1 to 2 for resistance.

Specified value: 1.0 to 20.0 ohms (at approx. 20° C)

If the specification was not obtained

1. Replace the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specification was obtained

Checking voltage supply

Crank the engine.

1. Using a multimeter , check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 electrical harness connector terminal 1 to Ground (GND) for voltage.

Specified value: Battery voltage.

Switch the ignition off.

If the specification was not obtained

1. Check the wiring from the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 electrical harness connector terminal 1 to the Engine Component Power Supply Relay J757 socket 2/87 for a short circuit to each other, Ground (GND) or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specification was obtained

Checking Ground (GND) activation

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a multimeter , check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 electrical harness connector to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a for an open circuit.

Specified value: 1.5 ohms max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
2. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing)

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Mass Air Flow Sensor/Intake Air Temperature Sensor, Checking

The following procedure is used to diagnose the Mass Air Flow (MAF) Sensor G70 and the Intake Air Temperature (IAT) Sensor G42.

The Intake Air Temperature (IAT) Sensor G42 is integrated into the Mass Air Flow (MAF) Sensor G70 and is controlled by the Motronic Engine Control Module (ECM) J623.

Note. Use only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) Sensor G70/Intake Air Temperature (IAT) Sensor G42.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SA5 fuse OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Coolant Temperature at least 80° C.
4. Ignition switched off.

Function test

1. Connect the scan tool.
2. Start engine and let it run at idle.
3. Using the scan tool, Check the air flow quantity of the Mass Air Flow (MAF) Sensor G70 at idle

1. End diagnosis and switch ignition off.

If the specified value was obtained, but the DTC memory has a DTC concerning the Mass Air Flow (MAF) Sensor G70/Intake Air Temperature (IAT) Sensor G42

1. Check the voltage supply of the Mass Air Flow (MAF) Sensor G70/Intake Air Temperature (IAT) Sensor G42 «Checking voltage supply»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__checking-voltage-supply) .

If specified value was not obtained

1. Check the wiring of the Mass Air Flow (MAF) Sensor G70/Intake Air Temperature (IAT) Sensor G42 «Checking electrical circuit»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__checking-electrical-circuit) .

Procedure

1. Disconnect the Mass Air Flow (MAF) Sensor G70/Intake Air Temperature (IAT) Sensor G42 electrical harness connector - 1 -.

Checking voltage supply

1. Using a multimeter , check the Mass Air Flow (MAF) Sensor G70/Intake Air Temperature (IAT) Sensor G42 electrical harness connector terminal 2 to engine Ground (GND) for voltage.

Scheme 882

1. Crank the engine.

Specified value: battery voltage.

1. Switch the ignition off.

If specified value was not obtained

1. Check the Mass Air Flow (MAF) Sensor G70/Intake Air Temperature (IAT) Sensor G42 electrical harness connector terminal 2 to the Engine Component Power Supply Relay J757 socket 2/87 for an open circuit.

Specified value: 1.5 ohms max.

If no malfunction is detected in the wiring and if the voltage supply was OK

Checking electrical circuit

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a multimeter , check the Mass Air Flow (MAF) Sensor G70/Intake Air Temperature (IAT) Sensor G42 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a terminals for an open circuit.

Specified value: 1.5 ohms max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was OK

1. Replace Mass Air Flow (MAF) Sensor G70 --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If no malfunction is detected in the wiring and if the voltage supply was not OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Throttle Valve Control Module, Checking

The Throttle Valve Control Module J338 is controlled by the Motronic Engine Control Module (ECM) J623.

Note. Use only gold-plated terminals when servicing terminals in harness connector of Mass Air Flow (MAF) Sensor J338.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J623 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Throttle valve must not be damaged or dirty.
4. Coolant Temperature at least 80° C.

Function

Throttle valve operation occurs by an electric motor (Throttle Drive (for Electronic Power Control (EPC)) G186) in the Throttle Valve Control Module and is operated by the Motronic Engine Control Module (ECM) according to the specifications of Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185.

The Throttle Valve Control Module J338 Contains the following components

1. Throttle Drive (for Electronic Power Control (EPC)) G186
2. Throttle Drive Angle Sensor 1 (for Electronic Power Control (EPC)) G187
3. Throttle Drive Angle Sensor 2 (for Electronic Power Control (EPC)) G188

Function test

1. Connect the scan tool.
2. Switch ignition on.
3. Using the scan tool, check the throttle valve position (absolute) at idle stop

1. Slowly depress the accelerator pedal to Wide Open Throttle (WOT) while observing the percentage display. The percentage display must increase uniformly.
2. Using the scan tool, check the throttle valve position (absolute) at Wide Open Throttle (WOT)

1. End diagnosis and switch ignition off.

If the specified values are not obtained

Procedure

1. Remove the rear engine cover - arrows -.
2. Remove the vacuum lines - 2 - , - 3 - and - arrows - from the air guide hose.
3. Disconnect the Mass Air Flow (MAF) Sensor G70 electrical harness connector - 1 -.

1. Loosen the hose clamps - 4 - and - 5 - and remove the air guide hose.

Scheme 883

1. Disconnect the Throttle Valve Control Module J338 electrical harness connector - 1 -.

Checking internal resistance

Scheme 884

1. Using a multimeter , check the Throttle Drive (for Electronic Power Control (EPC)) G186 at the Throttle Valve Control Module J338 terminals 3 to 5 for resistance.

Specified value: 1.0 to 5.0 ohms (at 20° C)

If the specified value was not obtained

1. Replace the Throttle Valve Control Module J338 --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specified value was obtained

Checking voltage

Scheme 885

1. Using a Multimeter , check the Throttle Valve Control Module J338 electrical harness connector terminals 2 to 6 for voltage.

Specified value: at least 4.5 V

1. Switch the ignition off.

If the specified value was obtained

1. Replace the Throttle Valve Control Module J338 --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specified value was not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Scheme 886

1. Using a Multimeter , check the Throttle Valve Control Module J338 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a terminals for an open circuit.

Specified value: 1.5 ohms max.

If the specification is not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND) or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and if the voltage supply was not OK

1. Replace Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing)

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Fuel Pressure Sensor, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Fuel Pump (FP) Control Module J538 OK.
2. The Engine Control Module (ECM) J623 fuses OK.
3. The fuel filter OK.
4. The battery voltage at least 12.5 V.

1. All electrical consumers switched off (radiator fan must NOT run during test).
2. A/C switched off.
3. The fuel tank at least 1 / 4 filled.
4. The ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the intake manifold. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj)

Checking voltage

Note. The intake has been removed for clarity.

Scheme 887

1. Disconnect the Fuel Pressure Sensor G247 electrical harness connector - 1 -.
2. Switch the ignition on.

1. Using a Multimeter , check the Fuel Pressure Sensor G247 for voltage.

1. Switch the ignition off.

If the specified values are obtained

1. Replace the Fuel Pressure Sensor G247.

If the specified values are not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Fuel Pressure Sensor G247 electrical harness connector terminals to the Engine Control Module (ECM) J623 electrical harness connector T60a terminals for an open circuit.

Specified value: 1.5 ohms Max.

If the specification is not obtained

1. Check the wiring for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

1. Install the intake manifold. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj)

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Low Fuel Pressure Sensor, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Fuel Pump (FP) Control Module J538 OK.
2. The Engine Control Module (ECM) J623 fuses OK.
3. The fuel filter OK.
4. The battery voltage at least 12.5 V.

1. All electrical consumers switched off (radiator fan must NOT run during test).
2. A/C switched off.
3. The fuel tank at least 1 / 4 filled.
4. The ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

Checking voltage

Scheme 888

1. Disconnect the Low Fuel Pressure Sensor G410 electrical harness connector - 2 -.
2. Switch the ignition on.

1. Using a multimeter , check the Low Fuel Pressure Sensor G410 electrical harness connector for voltage.

1. Switch the ignition off.

If the specified values are obtained

1. Replace the Low Fuel Pressure Sensor G410.

If the specified values are not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Low Fuel Pressure Sensor G410 electrical harness connector terminals to the Engine Control Module (ECM) J623 electrical harness connector T94a terminals for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and the voltage supply was not OK

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Fuel Metering Valve 1

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Fuel Pump (FP) Control Module J538 OK.
2. The Engine Component Power Supply Relay J757 OK.
3. The Fuse SA5 OK.
4. The fuel filter OK.

1. The parking brake engaged.
2. The battery voltage at least 12.5 V.
3. The selector lever of automatic transmission in position "P" or "N".
4. All electrical consumers switched off (radiator fan must NOT run during test).

1. A/C switched off.
2. The fuel tank at least 1 / 4 filled.
3. The ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Fuel Metering Valve N290 electrical harness connector - 5 -.

Checking internal resistance

1. Using a Multimeter , check the Fuel Metering Valve N290 terminals 1 to 2 for resistance

Specified value: 450 to 1000 ohms.

If the specified value was not obtained

1. Replace the High Pressure Fuel Pump. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj)

If the specified value was obtained

Checking voltage

Crank the engine.

1. Using a Multimeter , check the Fuel Metering Valve N290 electrical harness connector terminal 1 to Ground (GND) for voltage.

Specified value: battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

1. Check the wiring from the Fuel Metering Valve N290 electrical harness connector terminal 1 to the Engine Component Power Supply Relay J757 socket 2/87 for a short circuit to Ground (GND), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking wiring connections

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Scheme 889

1. Using a multimeter , check the Fuel Metering Valve N290 electrical harness connector terminal 2 to the Engine Control Module (ECM) J623 electrical harness connector T60a terminal 19 for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND), or an open circuit.
2. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Fuel Metering Valve 2

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Fuel Pump (FP) Control Module J538 OK.
2. The Engine Component Power Supply Relay J757 OK.
3. The Fuse SA5 OK.
4. The fuel filter OK.

1. The parking brake engaged.
2. The battery voltage at least 12.5 V.
3. The selector lever of automatic transmission in position "P" or "N".
4. All electrical consumers switched off (radiator fan must NOT run during test).

1. A/C switched off.
2. The fuel tank at least 1 / 4 filled.
3. The ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Fuel Metering Valve 2 N402 electrical harness connector - 4 -.

Checking internal resistance

1. Using a Multimeter , check the Fuel Metering Valve 2 N402 terminals for resistance

Specified value: 450 to 1000 ohms.

If the specified value was not obtained

1. Replace the High Pressure Fuel Pump. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj)

If the specified value was obtained

Checking voltage

Switch the ignition on.

1. Using a Multimeter , check the Fuel Metering Valve 2 N402 electrical harness connector terminal 1 to Ground (GND) for voltage.
2. Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained

1. Check the wiring from the Fuel Metering Valve 2 N402 electrical harness connector terminal 1 to the Engine Component Power Supply Relay J757 terminal 2/87 for a short circuit to Ground (GND), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking wiring connections

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a multimeter , check the Fuel Metering Valve 2 N402 electrical harness connector terminal 2 to the electrical harness connector T60a terminal 19 for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND), or an open circuit.
2. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Replace the. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Engine Coolant Temperature Sensor, Checking

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connector of Engine Coolant Temperature (ECT) Sensor G62.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Jumper wire.
3. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J623 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Ignition switched off.
4. Engine cold.

Function test

1. Connect the scan tool.
2. Switch the ignition on.
3. Using the scan tool, check the coolant temperature

If the specified value is not obtained

1. Continue test according to the following table

If the specified value was obtained

1. Start the engine and let it run at idle.

The temperature value must increase uniformly in increments of 1.0° C.

If the engine shows problems in certain temperature ranges and if the temperature does not climb uniformly, the temperature signal is intermittent.

1. Replace the Engine Coolant Temperature (ECT) Sensor G62 --> «19 - ENGINE - COOLING SYSTEM»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.
2. Remove the vacuum lines - 2 - , - 3 - and - arrows - from the air guide hose.

1. Loosen the hose clamps - 4 - and - 5 - and remove the air guide hose.

Scheme 890

1. Disconnect the Engine Coolant Temperature (ECT) Sensor G62 electrical harness connector - arrow -.

Checking internal resistance

Scheme 891

1. Using a multimeter , check the Engine Coolant Temperature (ECT) Sensor G62 terminals 1 to 2 for resistance.

Use the chart below for the specified values

1. Area A: Resistance values 0 to 50° C.
2. Area B: Resistance values 50 to 100° C.

Scheme 892

Specified values

1. Range A, 30° C equals a resistance of 1.5 to 2.0 kohms
2. Range B, 80° C equals a resistance of 275 to 375ohms

If any of the specified values was not obtained

1. Replace the Engine Coolant Temperature (ECT) Sensor G62 --> «19 - ENGINE - COOLING SYSTEM»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

Testing if display is approx. - 40.0° C

1. Disconnect the Engine Coolant Temperature (ECT) Sensor G62 electrical harness connector - arrow -.
2. Using a jumper wire , connect the Engine Coolant Temperature (ECT) Sensor G62 electrical harness connector terminals 1 to 2.

1. Check the value indicated on the scan tool display.

If the value jumps to approx. 140.0° C

1. End diagnosis and switch the ignition off.
2. Replace the Engine Coolant Temperature (ECT) Sensor G62 --> «19 - ENGINE - COOLING SYSTEM»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

If indication remains at approx. -40.0° C

Testing if display approx. 140.0° C

1. Disconnect the Engine Coolant Temperature (ECT) Sensor G62 electrical harness connector - arrow -.

If indication jumps to approx. -40.0° C

1. End diagnosis and switch ignition off.
2. Replace the Engine Coolant Temperature (ECT) Sensor G62 --> «19 - ENGINE - COOLING SYSTEM»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

If indication remains at approx. 140.0° C

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Engine Coolant Temperature (ECT) Sensor G62 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a terminals for an open circuit according to the wiring diagram.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
2. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Engine Speed Sensor, Checking

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Engine Speed (RPM) Sensor G28.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J623 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Ignition switched off.

Function

The Engine Speed (RPM) Sensor G28 detects RPM and reference marks. Without an engine speed signal, the engine will not start. If the engine speed signal fails while the engine is running, the engine will stop immediately.

Function test

1. Connect the scan tool.
2. Switch the ignition on.
3. Using the scan tool, check the engine speed

1. End diagnosis and switch ignition off.

If the specified value was not obtained

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Raise the vehicle. Refer to the «MAINTENANCE PROCEDURES»(ref-281395) .

Scheme 893

1. Disconnect the Engine Speed (RPM) Sensor G28 electrical harness connector - arrow -.

Checking internal resistance

1. Using a multimeter , check the Engine Speed (RPM) Sensor G28 terminals 1 to 2 for resistance.

Specified value: 0.7 to 1000 kOhm

Specified value: infinity (infinity)

If any of the specified values are not obtained

1. Replace the Engine Speed (RPM) Sensor G28 --> «13 - ENGINE - CRANKSHAFT, CYLINDER BLOCK»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

If the specified values are obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Engine Speed (RPM) Sensor G28 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a terminals for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Remove the Engine Speed (RPM) Sensor G28 and check the sensor wheel for proper seating, damage and run out --> «13 - ENGINE - CRANKSHAFT, CYLINDER BLOCK»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

If the sensor wheel is OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Intake Flap Motor, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SA3 OK.
2. The parking brake engaged.
3. The battery voltage at least 12.5 V.
4. The selector lever of automatic transmission in position "P" or "N".

1. All electrical consumers switched off (radiator fan must NOT run during test).
2. A/C switched off.
3. The fuel tank at least 1 / 4 filled.
4. The ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

Scheme 894

1. Remove the front engine cover - arrows -.

Checking voltage supply

Scheme 895

1. Disconnect the Intake Flap Motor V157 electrical harness connector - 5 -.

Crank the engine.

1. Using a Multimeter , check the Intake Flap Motor V157 electrical harness connector terminal 1 to 3 for voltage.

Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained

1. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
2. Check the wiring from the Intake Flap Motor V157 electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
3. Check the wiring from the Intake Flap Motor V157 electrical harness connector terminal 3 to the to the Ground (GND) connection 1 in the engine compartment for a short circuit to each other, Battery (+), or an open circuit.
4. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a multimeter , check the Intake Flap Motor V157 electrical harness connector terminal 2 to the Engine Control Module (ECM) J623 electrical harness connector T60a terminal 6 for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

The Intake Flap Motor V157 must be adapted to the Engine Control Module (ECM) J623.

To adapt the Intake Flap Motor V157 to the Engine Control Module (ECM) J623 perform the following steps

Test requirements

1. The battery voltage at least 12.5 V.
2. Coolant temperature must be between 20° C and 80° C.
3. No DTCs stored in DTC memory.

1. Start the engine and let run at idle for at least 70 seconds.
2. The Engine Control Module (ECM) J623 will automatically adept the Intake Flap Motor V157.
3. Assembly is performed in the reverse order of removal.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Variable Intake Manifold Runner Motor, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SA3 OK.
2. The parking brake engaged.
3. The battery voltage at least 12.5 V.
4. The selector lever of automatic transmission in position "P" or "N".

1. All electrical consumers switched off (radiator fan must NOT run during test).
2. A/C switched off.
3. The fuel tank at least 1 / 4 filled.
4. The ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the front engine cover - arrows -.

Checking voltage supply

1. Disconnect the Variable Intake Manifold Runner Motor V183 electrical harness connector - 4 -.

Crank the engine.

1. Using a Multimeter , check the Variable Intake Manifold Runner Motor V183 electrical harness connector terminal 1 to 3 for voltage.

Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained

1. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
2. Check the wiring from the Variable Intake Manifold Runner Motor V183 electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
3. Check the wiring from the Variable Intake Manifold Runner Motor V183 electrical harness connector terminal 3 to the to the Ground (GND) connection 1 in the engine compartment for a short circuit to each other, Battery (+), or an open circuit.
4. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a multimeter , check the Variable Intake Manifold Runner Motor V183 electrical harness connector terminal 2 to the Engine Control Module (ECM) J623 electrical harness connector T60a terminal 6 for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

The Variable Intake Manifold Runner Motor V183 must be adapted to the Engine Control Module (ECM) J623.

To adapt the Variable Intake Manifold Runner Motor V183 to the Engine Control Module (ECM) J623 perform the following steps

Test requirements

1. The battery voltage at least 12.5 V.
2. Coolant temperature must be between 20° C and 80° C.
3. No DTCs stored in DTC memory.

1. Start the engine and let run at idle for at least 70 seconds.
2. The Engine Control Module (ECM) J623 will automatically adept the Variable Intake Manifold Runner Motor V183.
3. Assembly is performed in the reverse order of removal.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Intake Manifold Runner Position Sensor 1, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) J623 fuses OK.
2. The parking brake engaged.
3. The battery voltage at least 12.5 V.
4. The selector lever of automatic transmission in position "P" or "N".

1. All electrical consumers switched off (radiator fan must NOT run during test).
2. A/C switched off.
3. The fuel tank at least 1 / 4 filled.
4. The ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.

Scheme 896

1. Disconnect the Intake Manifold Runner Position Sensor G336 electrical harness connector - 2 -.

Checking voltage supply

Switch the ignition on.

1. Using a Multimeter , check the Intake Manifold Runner Position Sensor G336 electrical harness connector for voltage.

Switch the ignition off.

If the specified values are obtained

1. Replace the Intake Manifold Runner Position Sensor G336.

If the specified values are not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a multimeter , check the Intake Manifold Runner Position Sensor G336 electrical harness connector terminals to the Engine Control Module (ECM) J623 electrical harness connector T60a terminals for an open circuit.

Specified value: 2.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

The Intake Manifold Runner Position Sensor G336 must be adapted to the Engine Control Module (ECM) J623.

To adapt the Intake Manifold Runner Position Sensor G336 to the Engine Control Module (ECM) J623 perform the following steps

Test requirements

1. The battery voltage at least 12.5 V.
2. Coolant temperature must be between 20° C and 80° C.
3. No DTCs stored in DTC memory.

1. Start the engine and let run at idle for at least 70 seconds.
2. The Engine Control Module (ECM) J623 will automatically adept the Intake Manifold Runner Position Sensor G336.

Assembly is performed in the reverse order of removal.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Intake Manifold Runner Position Sensor 2, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The fuses OK.
2. The parking brake engaged.
3. The battery voltage at least 12.5 V.
4. The selector lever of automatic transmission in position "P" or "N".

1. All electrical consumers switched off (radiator fan must NOT run during test).
2. A/C switched off.
3. The fuel tank at least 1 / 4 filled.
4. The ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.

1. Disconnect the Intake Manifold Runner Position Sensor 2 G512 electrical harness connector - 4 -.

Switch the ignition on.

Checking voltage supply

1. Using a Multimeter , check the Intake Manifold Runner Position Sensor 2 G512 electrical harness connector for voltage.

Switch the ignition off.

If the specified values are obtained

1. Replace the Intake Manifold Runner Position Sensor 2 G512.

If specified values are not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .
2. Using a multimeter , check the Intake Manifold Runner Position Sensor 2 G512 electrical harness connector terminals to the electrical harness connector T60a terminals for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Replace the. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

The Intake Manifold Runner Position Sensor 2 G512 must be adapted to the.

To adapt the Intake Manifold Runner Position Sensor 2 G512 to the perform the following steps

Test requirements

1. The battery voltage at least 12.5 V.
2. Coolant temperature must be between 20° C and 80° C.
3. No DTCs stored in DTC memory.

1. Start the engine and let run at idle for at least 70 seconds.
2. The will automatically adept the Intake Manifold Runner Position Sensor 2 G512.

Assembly is performed in the reverse order of removal.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Fuel Injectors, Checking

The following test procedure is used to diagnose Fuel Injectors 30, 31, 32, 33, 83, 84, 85, 86.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Diode test lamp (12V).
3. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) J623 fuses OK.
2. The Engine Speed (RPM) Sensor G28 OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Ignition switched off.

1. Observe safety precautions.
2. Observe rules for cleanliness.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the intake manifold. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .
2. Disconnect the Fuel Injector electrical harness connector from the Fuel Injector to be tested.

Fuel rail, right cylinder head (Bank 1)

1. Cylinder 1 Fuel Injector N30
2. Cylinder 2 Fuel Injector N31
3. Cylinder 3 Fuel Injector N32
4. Cylinder 4 Fuel Injector N33

Scheme 897

Fuel rail, left cylinder head (Bank 2)

1. Cylinder 8 Fuel Injector N86
2. Cylinder 7 Fuel Injector N85
3. Cylinder 6 Fuel Injector N84
4. Cylinder 5 Fuel Injector N83

Checking internal resistance

Scheme 898

1. Using a multimeter , check terminals 1 to 2 of the Fuel Injector to be tested for resistance.

Specified value: 12.0 to 20.0 ohms (at approx. 20° C)

If the specified value was not obtained

1. Replace the faulty Fuel Injector --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specified value was obtained

Checking activation

Scheme 899

1. Connect a diode test lamp (12V) to the Fuel Injector electrical harness connector terminals 1 and 2 of the Fuel Injector to be tested.
2. Operate the starter and test the activation of the Fuel Injector.

LED should flicker.

1. Switch the ignition off.

If LED flickers

1. Replace the faulty Fuel Injector --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If LED does not flicker

Checking activation and wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .
2. Using a Multimeter , check the electrical harness connector terminals of the Fuel Injector to be tested to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a terminals for an open circuit.

Fuel injectors (Bank 1)

Fuel injectors (Bank 2)

Specified value: 1.5 ohms Max.

If the specification is not obtained

1. Check the wiring for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

1. Install the intake manifold. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Function Tests

> Heated Oxygen Sensor and Oxygen Sensor Regulation before Catalytic Converter, Checking

> Oxygen Sensor and Oxygen Sensor Regulation after Catalytic Converter, Checking

Heated Oxygen Sensor 1

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Heated Oxygen Sensor (HO2S) G39.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J623 fuses OK.
2. The Oxygen Sensor (O2S) Heater Z19 before catalytic converter OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Exhaust system between catalytic converter and cylinder head properly sealed.
4. Coolant Temperature at least 80° C.

Function test

1. Perform the function test located in diagnostic mode 06. Refer to «OBDMID 01 ($01): Oxygen Sensor Monitor Bank 1 - Sensor 1»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__obdmid-01-01-oxygen-sensor-monitor) .

If specified values are obtained

1. End diagnosis and switch the ignition off.

If the specified values are not obtained

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.
2. Remove the vacuum lines - 2 - , - 3 - and - arrows - from the air guide hose.
3. Disconnect the Mass Air Flow (MAF) Sensor G70 electrical harness connector - 1 -.

1. Loosen the hose clamps - 4 - and - 5 - and remove the air guide hose.

1. Disconnect the Heated Oxygen Sensor (HO2S) G39 electrical harness connector - 1 -.

Checking primary voltage

1. Crank the engine.

1. Using a multimeter , check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminals 2 to 6 for voltage.

Specified value: 0.400 to 0.500 Volts

1. Switch the ignition off.

If the specified value was not obtained

1. Replace Heated Oxygen Sensor (HO2S) G39. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a terminals for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Heated Oxygen Sensor 2

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Heated Oxygen Sensor (HO2S) 2 G108.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J623 fuses OK.
2. The Oxygen Sensor (O2S) 2 Heater Z28 before catalytic converter OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Exhaust system between catalytic converter and cylinder head properly sealed.
4. Coolant Temperature at least 80° C.

Function test

1. Perform the function test located in diagnostic mode 06. Refer to «OBDMID 05 ($05): Oxygen Sensor Monitor Bank 2 - Sensor 1»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__obdmid-05-05-oxygen-sensor-monitor) .

If specified values are obtained

1. End diagnosis and switch the ignition off.

If the specified values are not obtained

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.
2. Remove coolant reservoir - arrow - and disconnect electrical connector on Engine Coolant Level (ECL) Warning Switch F66 at bottom of coolant reservoir.
3. Remove the screw - arrow - retaining the coolant reservoir.
4. Remove the coolant reservoir and disconnect the Engine Coolant Level (ECL) Warning Switch F66 electrical harness connector.

1. Position the coolant reservoir aside with the coolant hoses - 1 through 3 - attached.

1. Disconnect the Heated Oxygen Sensor (HO2S) 2 G108 electrical harness connector - 1 -.

Checking primary voltage

1. Using a multimeter , check the Heated Oxygen Sensor (HO2S) 2 G108 electrical harness connector terminals 2 to 6 for voltage.

Specified value: 0.400 to 0.500 Volts

1. Switch the ignition off.

If the specified value was not obtained

1. Replace the Heated Oxygen Sensor (HO2S) 2 G108. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Heated Oxygen Sensor (HO2S) 2 G108 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a terminals for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

The following procedure is used to diagnose Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 which is controlled by the Motronic Engine Control Module (ECM) J623.

Note. When servicing the electrical harness connector terminals of the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 , use only gold-plated terminals.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J623 fuses OK.
2. Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater Z29 OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. Vehicles with automatic transmission, selector lever in position "P" or "N".
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Exhaust system between catalytic converter and cylinder head properly sealed.

1. Coolant Temperature at least 80° C.

Function test

1. Perform the function test located in diagnostic mode 06. Refer to «OBDMID 02 ($02): Oxygen Sensor Monitor Bank 1- Sensor 2»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__obdmid-02-02-oxygen-sensor-monitor) .

If specified values are obtained

1. End diagnosis and switch the ignition off.

If the specified values are not obtained

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.
2. Remove the vacuum lines - 2 - , - 3 - and - arrows - from the air guide hose.
3. Disconnect the Mass Air Flow (MAF) Sensor G70 electrical harness connector - 1 -.

1. Loosen the hose clamps - 4 - and - 5 - and remove the air guide hose.

1. Disconnect the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 electrical harness connector - 2 -.

Checking primary voltage

1. Crank the engine.

1. Using a multimeter , check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 electrical harness connector terminals 3 to 4 for voltage.

Specified value: 0.400 to 0.500 Volts

1. Switch the ignition off.

If the specified value was obtained

1. Replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specified value was not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a terminals for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Note. When servicing the electrical harness connector terminals of the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 , use only gold-plated terminals.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J623 fuses OK.
2. Oxygen Sensor (O2S) 2 (behind Three Way Catalytic Converter (TWC)) Heater Z30 OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. Vehicles with automatic transmission, selector lever in position "P" or "N".
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Exhaust system between catalytic converter and cylinder head properly sealed.

1. Coolant Temperature at least 80° C.

Function test

1. Perform the function test located in diagnostic mode 06. Refer to «OBDMID 06 ($06): Oxygen Sensor Monitor Bank 2 - Sensor 2»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__obdmid-06-06-oxygen-sensor-monitor) .

If specified values are obtained

1. End diagnosis and switch the ignition off.

If the specified values are not obtained

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.
2. Remove coolant reservoir - arrow - and disconnect electrical connector on Engine Coolant Level (ECL) Warning Switch F66 at bottom of coolant reservoir.
3. Remove the screw - arrow - retaining the coolant reservoir.
4. Remove the coolant reservoir and disconnect the Engine Coolant Level (ECL) Warning Switch F66 electrical harness connector.

1. Position the coolant reservoir aside with the coolant hoses - 1 through 3 - attached.

1. Disconnect the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 electrical harness connector - 2 -.

Checking primary voltage

1. Switch the ignition on.

1. Using a multimeter , check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 electrical harness connector terminals 3 to 4 for voltage.

Specified value: 0.400 to 0.500 Volts

1. Switch the ignition off.

If the specified value was obtained

1. Replace the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specified value was not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a terminals for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Motronic Engine Control Module

> Voltage Supply, Checking

> Engine Control Module, Removing and Installing

The Motronic Engine Control Module (ECM) J623 regulates fuel injection, Throttle Valve Control Module J338 , oxygen sensor regulation, ignition, knock control, Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 , engine speed limitation through fuel injectors or Engine Component Power Supply Relay J757 as well as On Board Diagnostic (OBD).

Voltage Supply, Checking

The Motronic Engine Control Module (ECM) Power Supply Relay J271 supplies voltage to the Motronic Engine Control Module (ECM) J623.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse S133 OK.
2. Fuse SA4 OK.
3. Fuse SA8 OK.
4. Battery voltage at least 12.5 volts.

1. All electrical consumers such as, lights and rear window defroster, switched off.
2. Vehicles with automatic transmission, selector lever in position "P" or "N".
3. A/C switched off.
4. Ground (GND) connections between engine/transmission/chassis OK.

1. Ignition switched off.

Test sequence

1. Remove the Motronic Engine Control Module (ECM) Power Supply Relay J271.

Checking voltage

1. Using a Multimeter , check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 1/30 to Ground (GND).

Specified value: battery voltage.

If the specified value was not obtained

1. Check the wiring connections from the Battery to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 1/30 for an open or short circuit.
2. Check the wiring connections for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified value was obtained

1. Using a Multimeter , check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 4/85 to Ground (GND).
2. Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained

1. Check the wiring connections from the Battery to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 4/85 for an open or short circuit.
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking activation

1. Switch the ignition on.
2. Using a Multimeter , check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 3/86 to Ground (GND).
3. Switch the ignition off.

Specified value: 0.5 V Max.

If the specified value was obtained

1. Replace the Motronic Engine Control Module (ECM) Power Supply Relay J271. Refer to --> «97 - WIRES»(/audi/a6/c6-2008-2011/remont/cruise-control-systems/#electrical-equipment) .

If the specified value was not obtained

1. Check the wiring from the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 3/86 to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a terminal 92 for a short to Ground (GND) or an open circuit.
2. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was not OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Checking voltage

1. Switch the ignition on.
2. Using a Multimeter , check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 to Ground (GND) for voltage.
3. Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623 or the. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .
2. Using a Multimeter , check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94 terminals or the electrical harness connector T94a terminals for resistance.

Specified value: 2.0 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), Ground (GND), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and the voltage supply OK

1. Replace the Motronic Engine Control Module (ECM) J623 or the. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Final procedures

Assembly is performed in the reverse order of removal.

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Engine Control Module, Removing and Installing

Special tools, testers and auxiliary items required

1. Heat gun.

Removal

1. Remove the rubber seal - 1 - for plenum chamber cover - 2 -.

Scheme 900

1. Remove plenum chamber cover - 2 -.
2. Remove the windshield wiper arm caps.

Scheme 901

1. Loosen the wiper arm nuts - arrows -.
2. Remove the wiper arms by rocking slightly with an up and down motion.
3. Remove the wiper arm nuts and wiper arms.

Note. If wiper arms cannot be removed, use a standard puller.

1. Remove cowl grille screws - arrows -.

Scheme 902

1. Remove the cowl grille - 1 - from the windshield.

Scheme 903

1. Remove the screws - 1 and 3 - and dome braces - 2 - if equipped.

Scheme 904

1. Remove the screws - arrows - and E-box cover.

Scheme 905

1. Using a screwdriver - arrows 1 and 2 - , remove the retaining clip - 3 - and Engine Control Module (ECM) J623 from E-box.

Note. The Engine Control Module (ECM) J623 - 1 - is secured to a protective housing - 2, 5 - with shear bolts - 3, 4 -. To disconnect the electrical harness connectors from the Engine Control Module (ECM) J623 (e.g. to connect the test box or to replace the ECM), the protective housing - 2, 5 - must be removed. The threads of the shear bolts - 3 - are coated with a locking compound to make removal more difficult and must be heated prior to removal.

Scheme 906

1. Using a Heat gun set at its lowest setting, heat the shear bolt for approx. 20 to 25 seconds.

Scheme 907

1. Remove the shear bolt with locking pliers. Discard the used shear bolts.

Repeat the previous steps for the second shear bolt.

1. Remove the protective housing from the Motronic Engine Control Module (ECM) J623.

Note. Adaptation values are erased when the connectors are disconnected from the Motronic Engine Control Module (ECM) J623 , DTC memory content remains intact.

1. Disconnect the electrical harness connectors from the Motronic Engine Control Module (ECM) J623.

Installing

Installation is in the reverse order of removal. Note the following

1. The ECM must be installed with the protective housing.
2. Use new shear bolts.
3. Remove a thread compound from the threaded holes with a thread cutter (tap) to allow for new shear bolt installation.

After installing a new Motronic Engine Control Module (ECM) J623 , the following work steps must be performed

1. Activate the Motronic Engine Control Module (ECM) J623.

Additional Signals, Checking

> CAN-Bus Terminal Resistance, Checking

> Vehicle Speed Signal, Checking

CAN-Bus Terminal Resistance, Checking

The following procedure is used to diagnose the CAN-Bus terminal resistance of the Motronic Engine Control Module (ECM) J623.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirement

1. A CAN-Bus malfunction was recognized.
2. Fuse SF6 OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Ignition switched off.

Function

The Motronic Engine Control Module (ECM) J623 communicates with the and other CAN-Bus capable control modules.

The control modules are connected by two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information (messages). Missing information on the CAN-bus is recognized as a malfunction by the Motronic Engine Control Module (ECM) J623 and the other control modules connected to the CAN-bus.

Trouble-free operation of the CAN-Bus requires that it have a terminal resistance. This central terminal resistance is located in the Motronic Engine Control Module (ECM) J623.

Checking internal resistance

1. Disconnect the Energy Management Control Module J644 electrical harness connector.

Note. The Motronic Engine Control Module (ECM) J623 must remain connected for the following step.

1. Using a Multimeter , check the Energy Management Control Module J644 electrical harness connector terminals 9 to 10 for resistance.

Specified value: 60 to 72 ohms (at approx. 20° C)

If the specified value was not obtained

1. Check the wiring.

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623 or the. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .
2. Using a Multimeter , check the Energy Management Control Module J644 electrical harness connector to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a or the electrical harness connector T94a for resistance.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Vehicle Speed Signal, Checking

The following procedure requires a test drive. Observe all safety precautions.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Speedometer G21 OK.
2. The Engine Control Module (ECM) fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Ignition switched off.

Function test

1. Connect the scan tool.
2. Perform a road test with a vehicle speed greater than 5 Km/h.
3. Using the scan tool, Check the vehicle speed

1. Compare the vehicle speed on the scan tool to the Speedometer G21.

Specified value: a difference of no greater than 10%.

If the specified value was not obtained or no speed was displayed

1. Check the wiring from the Engine Control Module (ECM) J623 to the Instrument Cluster Control Module J285 for an open circuit, Short to Battery (+), or to Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Exhaust System Components

> Three Way Catalytic Converter, Checking

For all Exhaust System, Emission control component locations. Refer to --> 26 - EXHAUST SYSTEM, EMISSION CONTROLS

For all Exhaust System, Emission control removal/installation procedures and torque specifications. Refer to --> 26 - EXHAUST SYSTEM, EMISSION CONTROLS

Check the Technical Bulletins for information that may supersede any information included in this article.

Note. All manufacturers special tools as well as common tools may contain a manufacturer specific part number. These tools may be substituted with an equivalent aftermarket tool or are available for purchase through Audi. Manufacturers special tools as well as common tools that contain a manufacturer specific part number may be referenced in the test procedure illustrations showing the tool use or installation. If the manufacturer specific tool is not being used, an equivalent aftermarket tool may be installed in the same manner as the manufacturers special tool.

Three Way Catalytic Converter, Checking

Test requirements

1. Battery voltage at least 12.5 volts.
2. Oxygen Sensors OK.
3. No leaks or damage to exhaust system.

Function test

1. Perform the function test in Diagnostic Mode 06. Refer to --> «Diagnostic Mode 6 - Check Test Results of Components Not Continuously Monitored»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-6-check-test) .
2. End diagnosis and switch the ignition off.

If the specified values are exceeded

1. Check the exhaust system for leaks.
2. If necessary, repair the leak in the exhaust system.
3. Erase the DTC memory. Refer to --> «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
4. Perform a road test to verify Repair.

If the DTC does not return

Repair complete, Generate readiness code. Refer to --> Readiness Code .

1. End diagnosis.

If no leaks are found in the exhaust system

1. Replace the catalytic converter including front exhaust pipe. Refer to «26 - EXHAUST SYSTEM, EMISSION CONTROLS»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Secondary Air Injection System

> Secondary Air Injection Pump Relay, Checking

> Secondary Air Injection Pump Motor, Checking

Principle

Due to the rich mixture during the cold start phase, the exhaust emissions contain an increased level of unburned hydrocarbons. The Secondary Air Injection (AIR) system improves the secondary oxidation within the catalytic converter, thereby reducing harmful emissions. The heat released by secondary oxidation shortens the startup time of the catalytic converter considerably, as well as significantly improves emissions quality during the cold-running phase.

Function

1. During cold start (with coolant temperatures +15 to +35° C), the Secondary Air Injection (AIR) system blows air behind the exhaust valve for approx. 65 seconds. This produces an oxygen rich exhaust gas, causes the after burning and reduces the heating-up phase of the catalytic converter.
2. In addition, the Secondary Air Injection (AIR) system is switched on with a delay of approx. 20 seconds during idle for 5 seconds after every subsequent engine start up to max. 80° C coolant temperature and is checked by On Board Diagnostic (OBD).

Secondary Air Injection Pump Relay, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse S130 OK.
2. The Engine Component Power Supply Relay J757 OK.
3. Battery voltage at least 12.5 V.
4. All electrical consumers switched off (radiator fan must NOT run during test).

1. A/C switched off.
2. The ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the Secondary Air Injection (AIR) Pump Relay -J299-.

Checking voltage

1. Using a Multimeter , check the Secondary Air Injection (AIR) Pump Relay -J299- socket 2/30 to Ground (GND).

Specified value: battery voltage.

If the specified value was not obtained

1. Check the wiring connection from the battery to the Secondary Air Injection (AIR) Pump Relay -J299- socket 2/30 for an open circuit or a short circuit.
2. Check the wiring connections for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified value was obtained

1. Crank the engine.
2. Using a Multimeter , check the Secondary Air Injection (AIR) Pump Relay -J299- socket 6/86 to Ground (GND).

Specified value: battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

1. Check the wiring connection from the Engine Component Power Supply Relay J757 socket 2/87 to the Secondary Air Injection (AIR) Pump Relay -J299- socket 6/86 for an open circuit or a short circuit.
2. Check the wiring connections for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) (test box) at Engine Control Module.

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .
2. Using a Multimeter , check the Secondary Air Injection (AIR) Pump Relay -J299- socket 4/85 to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a terminal 49 for resistance.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK

1. Replace the Secondary Air Injection (AIR) Pump Relay -J299-. Refer to --> «97 - WIRES»(/audi/a6/c6-2008-2011/remont/cruise-control-systems/#electrical-equipment) .

If no malfunction is found in the wiring and voltage supply was not OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Secondary Air Injection Pump Motor, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Secondary Air Injection (AIR) Pump Relay -J299- OK.
2. The Motronic Engine Control Module (ECM) Power Supply Relay J271 OK.
3. Battery voltage at least 12.5 V.
4. All electrical consumers switched off (radiator fan must NOT run during test).

1. A/C switched off.
2. The ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Raise the vehicle. Refer to the «MAINTENANCE PROCEDURES»(ref-281395) .

Scheme 908

1. Loosen the quick release fasteners - 1 - , - 2 - , - arrow - and remove the noise insulation panel.

Scheme 909

1. Disconnect the Secondary Air Injection (AIR) Pump Motor -V101- electrical harness connector - 2 -.

Checking voltage

1. Crank the engine.

1. Using a Multimeter , check the Secondary Air Injection (AIR) Pump Motor -V101- electrical harness connector terminals 1 to 2 for voltage.
2. Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained

1. Using a Multimeter , check the Secondary Air Injection (AIR) Pump Motor -V101- electrical harness connector terminal 2 to Ground (GND).

Specified value: battery voltage.

If the specified value was not obtained

1. Check the wiring connection from the Secondary Air Injection (AIR) Pump Relay -J299- socket 8/87 to the Secondary Air Injection (AIR) Pump Motor -V101- electrical harness connector terminal 2 for an open circuit or a short circuit.
2. Check the wiring connections for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking Ground (GND)

1. Using a Multimeter , check the Secondary Air Injection (AIR) Pump Motor -V101- electrical harness connector terminal 1 to Ground (GND) for resistance.

Specified value: 1.5 ohms Max.

If the specification was not obtained

1. Check the wiring from the Secondary Air Injection (AIR) Pump Motor -V101- electrical harness connector terminal 1 to the Ground connection 2 in engine compartment for a short circuit to each other, Battery (+), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK

1. Replace the Secondary Air Injection (AIR) Pump Motor -V101-. Refer to --> «26 - EXHAUST SYSTEM, EMISSION CONTROLS»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Ignition, Servicing

> Safety Precautions

> Test Data

> Camshaft Position Sensor, Checking

> Camshaft Adjustment Valve , checking

> Knock Sensor, Checking

> Ignition Coils with Power Output Stage, Checking

For all Ignition/Glow plug system component locations. Refer to --> 28 - IGNITION/GLOW PLUG SYSTEM

For all Ignition/Glow plug system removal/installation procedures and torque specifications. Refer to --> 28 - IGNITION/GLOW PLUG SYSTEM

Check the Technical Bulletins for information that may supersede any information included in this article.

Note. All manufacturers special tools as well as common tools may contain a manufacturer specific part number. These tools may be substituted with an equivalent aftermarket tool or are available for purchase through Audi. Manufacturers special tools as well as common tools that contain a manufacturer specific part number may be referenced in the test procedure illustrations showing the tool use or installation. If the manufacturer specific tool is not being used, an equivalent aftermarket tool may be installed in the same manner as the manufacturers special tool. The manufacturers test box Test Box 105 Pin VAG1598/42 is available for purchase or rental.

Test Data

Camshaft Position Sensor 1

Note. Use only gold-plated when servicing the electrical harness connector terminals of the Camshaft Position (CMP) Sensor G40.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J623 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Camshaft Position (CMP) Sensor G40 electrical harness connector - 3 -.

Note. The intake manifold has been removed for clarity.

1. Switch the ignition on.

1. Using a Multimeter , Check the Camshaft Position (CMP) Sensor G40 electrical harness connector terminals 1 to 3 for voltage.

Specified value: about 5.0 V

1. Switch the ignition off.

If the specification was not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , Check the Camshaft Position (CMP) Sensor G40 electrical harness connector to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK

1. Replace the Camshaft Position (CMP) Sensor G40. Refer to --> «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

If no malfunction is found in the wiring and voltage supply was not OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Camshaft Position Sensor 2

Note. Use only gold-plated when servicing the electrical harness connector terminals of the Camshaft Position (CMP) Sensor 2 G163.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J623 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Camshaft Position (CMP) Sensor 2 G163 electrical harness connector - 3 -.

Note. The intake manifold has been removed for clarity.

1. Switch the ignition on.

1. Using a Multimeter , Check the Camshaft Position (CMP) Sensor 2 G163 electrical harness connector terminals 1 to 3 for voltage.

Specified value: about 5.0 V

1. Switch the ignition off.

If the specification was not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Camshaft Position (CMP) Sensor 2 G163 electrical harness connector to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK

1. Replace the Camshaft Position (CMP) Sensor 2 G163. Refer to --> «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

If no malfunction is found in the wiring and voltage supply was not OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Camshaft Position Sensor 3

Note. Use only gold-plated when servicing the electrical harness connector terminals of the Camshaft Position (CMP) Sensor 3 G300.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J623 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

Scheme 910

1. Disconnect the Camshaft Position (CMP) Sensor 3 G300 electrical harness connector - 1 -.
2. Switch the ignition on.

1. Using a Multimeter , Check the Camshaft Position (CMP) Sensor 3 G300 electrical harness connector terminals 1 to 3 for voltage.

Specified value: about 5.0 V

1. Switch the ignition off.

If the specification was not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , Check the Camshaft Position (CMP) Sensor 3 G300 electrical harness connector to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK

1. Replace the Camshaft Position (CMP) Sensor 3 G300. Refer to --> «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

If no malfunction is found in the wiring and voltage supply was not OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Camshaft Position Sensor 4

Note. Use only gold-plated when servicing the electrical harness connector terminals of Camshaft Position (CMP) Sensor 4 G301.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The fuses Motronic Engine Control Module (ECM) J623 OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. A/C switched off.
2. Ground (GND) connections between engine/transmission/chassis OK.
3. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

Scheme 911

1. Disconnect the Camshaft Position (CMP) Sensor 4 G301 electrical harness connector - 6 -.
2. Switch the ignition on.

1. Using a Multimeter , Check the Camshaft Position (CMP) Sensor 4 G301 electrical harness connector terminals 1 to 3 for voltage.

Specified value: about 5.0 V

1. Switch the ignition off.

If the specification was not obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , Check the Camshaft Position (CMP) Sensor 4 G301 electrical harness connector to the Motronic Engine Control Module (ECM) J623 electrical harness connector T94a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK

1. Replace the Camshaft Position (CMP) Sensor 4 G301. Refer to --> «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

If no malfunction is found in the wiring and voltage supply was not OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Camshaft Adjustment Valve 1

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SA3 OK.
2. Motronic Engine Control Module (ECM) Power Supply Relay J271 OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Camshaft Adjustment Valve 1 N205 electrical harness connector - 8

Note. The intake manifold has been removed for clarity.

Checking internal resistance

1. Using a Multimeter , check the Camshaft Adjustment Valve 1 N205 terminals 1 to 2 for resistance.

Specified value: 5.0 to 8.0 ohms (at approx. 20° C)

If the specified value was not obtained

1. Replace Camshaft Adjustment Valve 1 N205. Refer to --> «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

If the specified value was obtained

Checking voltage

1. Switch the ignition on.
2. Using a Multimeter , Check the Camshaft Adjustment Valve 1 N205 electrical harness connector terminal 2 to Ground (GND) for voltage.
3. Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained

1. Check the wiring connection from the Camshaft Adjustment Valve 1 N205 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Camshaft Adjustment Valve 1 N205 electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was not OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Camshaft Adjustment Valve 1, Exhaust

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SA3 OK.
2. Motronic Engine Control Module (ECM) Power Supply Relay J271 OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Camshaft Adjustment Valve 1 (exhaust) N318 electrical harness connector - 2

Checking internal resistance

1. Using a Multimeter , check the Camshaft Adjustment Valve 1 (exhaust) N318 terminals 1 to 2 for resistance.

Specified value: 5.0 to 8.0 ohms (at approx. 20° C)

If the specified value was not obtained

1. Replace Camshaft Adjustment Valve 1 (exhaust) N318. Refer to --> «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

If the specified value was obtained

Checking voltage

1. Switch the ignition on.
2. Using a Multimeter , Check the Camshaft Adjustment Valve 1 (exhaust) N318 electrical harness connector terminal 2 to Ground (GND) for voltage.
3. Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained

1. Check the wiring connection from the Camshaft Adjustment Valve 1 (exhaust) N318 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Camshaft Adjustment Valve 1 (exhaust) N318 electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was not OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Camshaft Adjustment Valve 2

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SA3 OK.
2. Motronic Engine Control Module (ECM) Power Supply Relay J271 OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Camshaft Adjustment Valve 2 N208 electrical harness connector - 2

Checking internal resistance

1. Using a Multimeter , check the Camshaft Adjustment Valve 2 N208 terminals 1 to 2 for resistance.

Specified value: 5.0 to 8.0 ohms (at approx. 20° C)

If the specified value was not obtained

1. Replace Camshaft Adjustment Valve 2 N208. Refer to --> «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

If the specified value was obtained

Checking voltage

1. Switch the ignition on.
2. Using a Multimeter , Check the Camshaft Adjustment Valve 2 N208 electrical harness connector terminal 2 to Ground (GND) for voltage.
3. Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained

1. Check the wiring connection from the Camshaft Adjustment Valve 2 N208 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Camshaft Adjustment Valve 2 N208 electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was not OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Camshaft Adjustment Valve 2, Exhaust

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SA3 OK.
2. Motronic Engine Control Module (ECM) Power Supply Relay J271 OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Camshaft Adjustment Valve 2 (exhaust) N319 electrical harness connector - 5

Checking internal resistance

1. Using a Multimeter , check the Camshaft Adjustment Valve 2 (exhaust) N319 terminals 1 to 2 for resistance.

Specified value: 5.0 to 8.0 ohms (at approx. 20° C)

If the specified value was not obtained

1. Replace Camshaft Adjustment Valve 2 (exhaust) N319. Refer to --> «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-engine-mechanical-engine-codes-bvj) .

If the specified value was obtained

Checking voltage

1. Switch the ignition on.
2. Using a Multimeter , Check the Camshaft Adjustment Valve 2 (exhaust) N319 electrical harness connector terminal 2 to Ground (GND) for voltage.
3. Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained

1. Check the wiring connection from the Camshaft Adjustment Valve 2 (exhaust) N319 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Camshaft Adjustment Valve 2 (exhaust) N319 electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was not OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Knock Sensor 1

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The mounting bolt of Knock Sensor (KS) 1 G61 tightened to 20 Nm.
2. The Motronic Engine Control Module (ECM) J623 fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the intake manifold. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

1. Disconnect the black Knock Sensor (KS) 1 G61 electrical harness connector - 2 -.

Checking internal resistance

Scheme 912

1. Using a Multimeter , check the Knock Sensor (KS) 1 G61 terminals 1 to 2 for an internal short.

Specified value: infinity (Infinity).

If the specified value was not obtained

1. Replace Knock Sensor (KS) 1 G61. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Scheme 913

1. Using a Multimeter , check the Knock Sensor (KS) 1 G61 electrical harness connector to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and the resistance was not OK

1. Replace Knock Sensor (KS) 1 G61. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If no malfunction is found in the wiring and the resistance was OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

1. Install the intake manifold. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Knock Sensor 2

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The mounting bolt of Knock Sensor (KS) 2 G66 tightened to 20 Nm.
2. The Motronic Engine Control Module (ECM) J623 fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the intake manifold. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

1. Disconnect the brown Knock Sensor (KS) 2 G66 electrical harness connector - 9 -.

Checking internal resistance

1. Using a Multimeter , check the Knock Sensor (KS) 2 G66 terminals 1 to 2 for an internal short.

Specified value: infinity (Infinity).

If the specified value was not obtained

1. Replace Knock Sensor (KS) 2 G66. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Knock Sensor (KS) 2 G66 electrical harness connector to the Motronic Engine Control Module (ECM) J623 electrical harness connector T60a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and the resistance was not OK

1. Replace Knock Sensor (KS) 2 G66. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If no malfunction is found in the wiring and the resistance was OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

1. Install the intake manifold. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Knock Sensor 3

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The mounting bolt of Knock Sensor 3 G198 tightened to 20 Nm.
2. The Motronic Engine Control Module (ECM) J623 fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the intake manifold. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

1. Disconnect the black Knock Sensor 3 G198 electrical harness connector - 8 -.

Checking internal resistance

1. Using a Multimeter , check the Knock Sensor 3 G198 terminals 1 to 2 for an internal short.

Specified value: infinity (Infinity).

If the specified value was not obtained

1. Replace Knock Sensor 3 G198. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Knock Sensor 3 G198 electrical harness connector to the electrical harness connector T60a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and the resistance was not OK

1. Replace Knock Sensor 3 G198. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If no malfunction is found in the wiring and the resistance was OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

1. Install the intake manifold. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Knock Sensor 4

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The mounting bolt of Knock Sensor 4 G199 tightened to 20 Nm.
2. The Motronic Engine Control Module (ECM) J623 fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

1. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the intake manifold. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

1. Disconnect the brown Knock Sensor 4 G199 electrical harness connector - 1 -.

Checking internal resistance

1. Using a Multimeter , check the Knock Sensor 4 G199 terminals 1 to 2 for an internal short.

Specified value: infinity (Infinity).

If the specified value was not obtained

1. Replace Knock Sensor 4 G199. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , check the Knock Sensor 4 G199 electrical harness connector to the electrical harness connector T60a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and the resistance was not OK

1. Replace Knock Sensor 4 G199. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If no malfunction is found in the wiring and the resistance was OK

1. Replace the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

1. Install the intake manifold. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Bank 1

The following procedure is used to diagnose the Ignition Coils with Power Output Stage N70, N127, N291, N292.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Diode test lamp.
3. Wiring diagram.

Test requirements

1. Fuse SA2 OK.
2. The Motronic Engine Control Module (ECM) Power Supply Relay J271 OK.
3. The Engine Speed (RPM) Sensor G28 OK.
4. The Camshaft Position (CMP) Sensor G40 OK.

1. Battery voltage at least 12.5 volts.
2. All electrical consumers such as, lights and rear window defroster, switched off.
3. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
4. A/C switched off.

1. Ground (GND) connections between engine/transmission/chassis OK.
2. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.
2. Remove the vacuum lines - 2 - , - 3 - and - arrows - from the air guide hose.
3. Disconnect the Mass Air Flow (MAF) Sensor G70 electrical harness connector - 1 -.

1. Loosen the hose clamps - 4 - and - 5 - and remove the air guide hose.

Scheme 914

1. Remove the Ignition Coil electrical harness screws - 1 - and - 2 -.

1. Disconnect the Ignition Coil electrical harness connectors from the Ignition Coils with Power Output Stage - 3,4,5,6 -.

Checking voltage supply

1. Crank the engine.

1. Using a Multimeter , check the Ignition Coil electrical harness connector terminals 1 to Ground (GND) for voltage.

Specified value: battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

1. Check the Ignition Coil electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 for resistance.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified values were obtained

Checking Ground (GND)

1. Using a Multimeter , check the Ignition Coil electrical harness connector terminal 2/31 to Ground (GND) 2 on firewall for resistance.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit or short circuit to Battery (+).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified values were obtained

1. Using a Multimeter , check the Ignition Coil electrical harness connector terminal 4/31 to Ground (GND) 2 on the right cylinder head for resistance.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit or short circuit to Battery (+).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified values were obtained

Checking activation

1. Disable the power supply to the Fuel Injectors.

1. Using a diode test lamp , check the Ignition Coil electrical harness connector terminals 2/31 to 3 for voltage.
2. Crank the engine.

The LED should flicker.

1. Switch the ignition off.

If the LED flickers and the voltage was OK

1. Replace the faulty Ignition Coil with Power Output Stage. Refer to --> «28 - IGNITION/GLOW PLUG SYSTEM»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

The LED does not flicker

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , Check the Ignition Coil electrical harness connector to the Engine Control Module (ECM) J623 electrical harness connector T60a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified values were obtained

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Bank 2

The following procedure is used to diagnose the Ignition Coils with Power Output Stage N323, N324, N325, N326.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Diode test lamp.
3. Wiring diagram.

Test requirements

1. Fuse SA2 OK.
2. The Motronic Engine Control Module (ECM) Power Supply Relay J271 OK.
3. The Engine Speed (RPM) Sensor G28 OK.
4. The Camshaft Position (CMP) Sensor G40 OK.

1. Battery voltage at least 12.5 volts.
2. All electrical consumers such as, lights and rear window defroster, switched off.
3. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
4. A/C switched off.

1. Ground (GND) connections between engine/transmission/chassis OK.
2. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Remove the rear engine cover - arrows -.
2. Remove coolant reservoir - arrow - and disconnect electrical connector on Engine Coolant Level (ECL) Warning Switch F66 at bottom of coolant reservoir.
3. Remove the screw - arrow - retaining the coolant reservoir.
4. Remove the coolant reservoir and disconnect the Engine Coolant Level (ECL) Warning Switch F66 electrical harness connector.

1. Position the coolant reservoir aside with the coolant hoses - 1 through 3 - attached.

Scheme 915

1. Remove the Ignition Coil electrical harness screws - 2 - and - 3 -.

1. Disconnect the Ignition Coil electrical harness connectors from the Ignition Coils with Power Output Stage - 1,2,3,4 -.

Checking voltage supply

1. Crank the engine.

1. Using a Multimeter , check the Ignition Coil electrical harness connector terminals 1 to Ground (GND) for voltage.

Specified value: battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

1. Check the Ignition Coil electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 for resistance.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified values were obtained

Checking Ground (GND)

1. Using a Multimeter , check the Ignition Coil electrical harness connector terminal 2/31 to Ground (GND) 2 on firewall for resistance.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit or short circuit to Battery (+).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified values were obtained

1. Using a Multimeter , check the Ignition Coil electrical harness connector terminal 4/31 to Ground (GND) 2 on the right cylinder head for resistance.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit or short circuit to Battery (+).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified values were obtained

Checking activation

1. Disable the power supply to the Fuel Injectors.

1. Using a diode test lamp , check the Ignition Coil electrical harness connector terminals 2/31 to 3 for voltage.
2. Crank the engine.

The LED should flicker.

1. Switch the ignition off.

If the LED flickers and the voltage was OK

1. Replace the faulty Ignition Coil with Power Output Stage. Refer to --> «28 - IGNITION/GLOW PLUG SYSTEM»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

The LED does not flicker

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - MULTIPORT FUEL INJECTION (MFI)»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-fuel-injection-and-ignition-engine-codes-bvj) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Motronic Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

1. Using a Multimeter , Check the Ignition Coil electrical harness connector to the Engine Control Module (ECM) J623 electrical harness connector T60a for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified values were obtained

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

Assembly is performed in the reverse order of removal.

Final procedures

After repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

Transmission Regulating Electrical Components, Checking

> Safety Precautions

> Multi-Function Transmission Range Switch, Checking

> Transmission Input Speed Sensor, Checking

> Transmission Output Speed Sensor, Checking

> Transmission Fluid Temperature Sensor, Checking

> Solenoid Valve 1, Checking

> Automatic Transmission Pressure Regulating Valves, Checking

For all Automatic Transmission- Gears, Hydraulic controls component locations. Refer to --> 38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS

For all Automatic Transmission- Gears, Hydraulic controls removal/installation procedures and torque specifications. Refer to --> 38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS

Check the Technical Bulletins for information that may supersede any information included in this article.

Note. All manufacturers special tools as well as common tools may contain a manufacturer specific part number. These tools may be substituted with an equivalent aftermarket tool or are available for purchase through Audi. Manufacturers special tools as well as common tools that contain a manufacturer specific part number may be referenced in the test procedure illustrations showing the tool use or installation. If the manufacturer specific tool is not being used, an equivalent aftermarket tool may be installed in the same manner as the manufacturers special tool. The manufacturers test box Test Box 105 Pin VAG1598/42 is available for purchase or rental. Certainly you have received an electrical shock once before when touching something made out of metal. The reason for this is the electrostatic charge of the human body. This charge can lead to functional problems by touching the electrical components of the transmission and selector lever mechanism. Touch a grounded object, e.g. a water pipe or a hoist, before working on the electrical components! Do not make direct contact on electrical harness connector terminals! If special testing equipment is required during road test, note the following

Multi-Function Transmission Range Switch, Checking

Note. The Multi-Function Transmission Range (TR) Switch F125 is a component of the Mechatronic unit in the transmission and cannot be serviced individually.

Requirements

1. Control Module with indicator unit in the Instrument Cluster Control Module J285 must be OK.
2. The battery voltage must be at least 12.5 Volts.
3. All electrical consumers must be switched off.
4. The parking brake must be engaged.

1. The elector lever must be in the "P" position.
2. The Ground (GND) connections to transmission must be OK.

Test sequence

1. Switch the ignition on.
2. Depress the brake pedal and maintain depressed.
3. Shift the selector lever into all positions.

The selector lever position must correspond to the display of the Control Module with the indicator unit in the Instrument Cluster Control Module J285.

1. Switch the ignition off.

If the selector lever position does not correspond to the display of the Control Module with indicator unit in the Instrument Cluster Control Module J285

Scheme 916

1. Disconnect the Transmission Control Module (TCM) J217 electrical harness connector - direction of the arrow -.
2. Observe safety precautions.
3. Check the electrical harness connector for contact corrosion and ingress of water.

If the electrical harness connector is not OK

1. Repair the malfunction and repeat the test sequence.

If the electrical harness connector is OK

1. Check the wiring according to the wiring diagram

If no malfunctions are found in the wiring

1. Replace the Mechatronic unit in the transmission: --> «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Final procedures

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. Check the DTC memory.
2. If necessary, erase the Transmission Control Module (TCM) J217 memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Transmission Input Speed Sensor, Checking

Note. The Transmission Input Speed (RPM) Sensor G182 is a component of the Mechatronic unit in the transmission and cannot be serviced individually.

Requirements

1. The battery voltage must be at least 12.5 Volts.
2. All electrical consumers must be switched off.
3. The parking brake must be engaged.
4. The elector lever must be in the "P" position.

1. The Ground (GND) connections to transmission must be OK.

Test sequence

1. Disconnect the Transmission Control Module (TCM) J217 electrical harness connector - direction of the arrow -.
2. Observe safety precautions.
3. Check the electrical harness connector for contact corrosion and ingress of water.

If the electrical harness connector is not OK

1. Repair the malfunction.

If the electrical harness connector is OK

1. Check the wiring according to the wiring diagram

If no malfunctions are found in the wiring

1. Replace the Mechatronic unit in the transmission: --> «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Final procedures

1. Check the DTC memory.
2. If necessary, erase the Transmission Control Module (TCM) J217 memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Transmission Output Speed Sensor, Checking

Note. The Transmission Output Speed (RPM) Sensor G195 is a component of the Mechatronic unit in the transmission and cannot be serviced individually.

Requirements

1. The battery voltage must be at least 12.5 Volts.
2. All electrical consumers must be switched off.
3. The parking brake must be engaged.
4. The elector lever must be in the "P" position.

1. The Ground (GND) connections to transmission must be OK.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Transmission Control Module (TCM) J217 electrical harness connector - direction of the arrow -.
2. Observe safety precautions.
3. Check the electrical harness connector for contact corrosion and ingress of water.

If the electrical harness connector is not OK

1. Repair the malfunction.

If the electrical harness connector is OK

1. Check the wiring according to the wiring diagram

If no malfunctions are found in the wiring

1. Replace the Mechatronic unit in the transmission: --> «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Final procedures

1. Check the DTC memory.
2. If necessary, erase the Transmission Control Module (TCM) J217 memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Transmission Fluid Temperature Sensor, Checking

Note. The Transmission Fluid Temperature Sensor G93 is a component of the Mechatronic unit in the transmission and cannot be serviced individually.

Requirements

1. The battery voltage must be at least 12.5 Volts.
2. All electrical consumers must be switched off.
3. The parking brake must be engaged.
4. The elector lever must be in the "P" position.

1. The Ground (GND) connections to transmission must be OK.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Transmission Control Module (TCM) J217 electrical harness connector - direction of the arrow -.
2. Observe safety precautions.
3. Check the electrical harness connector for contact corrosion and ingress of water.

If the electrical harness connector is not OK

1. Repair the malfunction.

If the electrical harness connector is OK

1. Check the wiring according to the wiring diagram

If no malfunctions are found in the wiring

1. Replace the Mechatronic unit in the transmission: --> «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Final procedures

1. Check the DTC memory.
2. If necessary, erase the Transmission Control Module (TCM) J217 memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Solenoid Valve 1, Checking

Note. The Solenoid Valve 1 N88 is a component of the Mechatronic unit in the transmission and cannot be serviced individually.

Requirements

1. The battery voltage must be at least 12.5 Volts.
2. All electrical consumers must be switched off.
3. The parking brake must be engaged.
4. The elector lever must be in the "P" position.

1. The Ground (GND) connections to transmission must be OK.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Transmission Control Module (TCM) J217 electrical harness connector - direction of the arrow -.
2. Observe safety precautions.
3. Check the electrical harness connector for contact corrosion and ingress of water.

If the electrical harness connector is not OK

1. Repair the malfunction.

If the electrical harness connector is OK

1. Check the wiring according to the wiring diagram

If no malfunctions are found in the wiring

1. Replace the Mechatronic unit in the transmission: --> «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Final procedures

1. Check the DTC memory.
2. If necessary, erase the Transmission Control Module (TCM) J217 memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Automatic Transmission Pressure Regulating Valves, Checking

Note. The Automatic Transmission Pressure Regulating Valve 1 N215 , Automatic Transmission Pressure Regulating Valve 2 N216 , Automatic Transmission Pressure Regulating Valve 3 N217 , Automatic Transmission Pressure Regulating Valve 4 N218 , Automatic Transmission Pressure Regulating Valve 5 N233 , and the Automatic Transmission Pressure Regulating Valve 6 N371 are components of the Mechatronic unit in the transmission and cannot be serviced individually.

Requirements

1. The battery voltage must be at least 12.5 Volts.
2. All electrical consumers must be switched off.
3. The parking brake must be engaged.
4. The elector lever must be in the "P" position.

1. The Ground (GND) connections to transmission must be OK.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Transmission Control Module (TCM) J217 electrical harness connector - direction of the arrow -.
2. Observe safety precautions.
3. Check the electrical harness connector for contact corrosion and ingress of water.

If the electrical harness connector is not OK

1. Repair the malfunction.

If the electrical harness connector is OK

1. Check the wiring according to the wiring diagram

If no malfunctions are found in the wiring

1. Replace the Mechatronic unit in the transmission: --> «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Final procedures

1. Check the DTC memory.
2. If necessary, erase the Transmission Control Module (TCM) J217 memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Transmission Control Module

> Transmission Control Module Voltage Supply, Checking

> Transmission Control Module, Replacing

The Transmission Control Module (TCM) J217 receives information from the components that affect the shifts and forwards this information to the pressure regulator valves of the mechatronic, which control the slide valves in the valve body.

Transmission Control Module Voltage Supply, Checking

Note. The Transmission Control Module (TCM) J217 is a component of the Mechatronic unit in the transmission and cannot be serviced individually.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Requirements

1. The Transmission Control Module (TCM) J217 fuses OK.
2. The battery voltage must be at least 12.5 volts.
3. The Ground (GND) connections at the transmission OK.
4. The parking brake engaged.

1. The selector lever of automatic transmission in position "P".
2. All electrical consumers switched off.
3. The ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Transmission Control Module (TCM) J217 electrical harness connector - direction of the arrow -.
2. Check the electrical harness connector for damage, contact corrosion, or ingress of water.

If the electrical harness connector is not OK

1. Repair the malfunction.

If the electrical harness connector is OK

Checking voltage

1. Switch the ignition on.
2. Using a Multimeter , check the Power Supply Relay (terminal 15) J329 socket 2/87 to Ground (GND).

Specified value: battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

1. Check the wiring from the Power Supply Relay (terminal 15) J329 socket 2/87 to the Transmission Control Module (TCM) J217 electrical harness connector terminal 9 for an open circuit or a short circuit.
2. If necessary, repair the faulty wiring connection.

If the specified value was obtained

1. Using a Multimeter , check the Transmission Control Module (TCM) J217 electrical harness connector terminal 14 to Ground (GND).

Specified value: battery voltage.

If the specified value was obtained

1. Check the wiring from the Battery to the Transmission Control Module (TCM) J217 electrical harness connector terminal 14 for an open circuit or a short circuit.
2. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking Ground (GND)

1. Using a Multimeter , check the Transmission Control Module (TCM) J217 electrical harness connector terminals 13 and 16 to Ground (GND) for resistance.

Specified value: 1.5 ohms

If the specification was not obtained

1. Check the wiring for a an open circuit.
2. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring

1. Replace the Mechatronic unit in the transmission: --> «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Final procedures

1. Check the DTC memory.
2. If necessary, erase the Transmission Control Module (TCM) J217 memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Transmission Control Module, Replacing

Note. The Transmission Control Module (TCM) J217 is a component of the Mechatronic unit in the transmission and cannot be serviced individually. To achieve optimal anti-theft protection for the vehicle, an anti-theft immobilizer was installed. The anti-theft immobilizer is a system for enabling/locking the Transmission Control Module (TCM) J217. To perform adaptation of the anti-theft immobilizer. Refer to the Ebahn website.

Work procedure

Check the identification of the previous Transmission Control Module (TCM) J217 as follows

1. Connect the scan tool.
2. Switch the ignition on.
3. Select "Diagnostic mode 9: Vehicle information."
4. Select the "Test-ID 04: Calibration identification".

1. The Transmission Control Module (TCM) J217 identification will be displayed.
2. End diagnosis and switch the ignition off.
3. Replace the Mechatronic unit in the transmission: --> «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .
4. Check the identification of the new Transmission Control Module (TCM) J217 to ensure it matches the old Transmission Control Module (TCM) J217.

1. Code the Transmission Control Module (TCM) J217.

Generate readiness code. Refer to --> Readiness Code .

CAN-Bus Terminal Resistance, TCM to ECM, Checking

The Engine Control Module (ECM) J623 communicates with all databus capable control modules via a CAN databus.

These databus capable control modules are connected via two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information (messages). Missing information on the databus is recognized as a malfunction and stored.

Trouble-free operation of the CAN-bus requires that it have a terminal resistance. The central terminal resistor is located in the Engine Control Module (ECM) J623.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirement

1. A CAN-Bus malfunction was recognized.
2. The Engine Control Module (ECM) J623 fuses OK.
3. The Transmission Control Module (TCM) J217 fuses OK.
4. Battery voltage at least 12.5 V.

1. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «General Diagnosis»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

Start diagnosis

1. Disconnect the Transmission Control Module (TCM) J217 electrical harness connector - direction of the arrow -.

Note. The Engine Control Module (ECM) J623 must remain connected for the following step.

1. Using a Multimeter , check the Transmission Control Module (TCM) J217 electrical harness connector terminals 2 to 6 for resistance.

Specified value: 60 to 72 ohms (at approx. 20° C)

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used. Perform the following step.

1. Install the test box. Refer to --> «24 - FUEL INJECTION SYSTEM»(/audi/a6/c6-2008-2011/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

If the manufacturers test box is not being used. Perform the following step.

1. Remove the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Removing and Installing»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__engine-control-module-removing-and-installing) .
2. Using a Multimeter , check the Transmission Control Module (TCM) J217 electrical harness connector to the Engine Control Module (ECM) J623 electrical harness connector T94a for resistance.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

1. Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring

1. Replace the Mechatronic unit in the transmission: --> «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Final procedures

After the repair work, the following work steps must be performed in the following sequence

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/c6-2008-2011/remont/cooling-fan/#42l-v8-4v-generic-scan-tool-engine-codes-bvj) .

1. End of diagnosis.

On Board Diagnostic

> Generic Scan Tool Article Contents

> OBD Systems

> Malfunction Indicator Lamp Illumination

> CAN Data Link

> Electronic Power Control Warning Lamp

Generic Scan Tool Article Contents

Included in the contents of this GST article is a summary table of the vehicle specific OBD II Emission Related Engine and Transmission DTCs. This table contains all necessary Malfunction Criteria, Threshold Values, Secondary Parameters, Enabling Conditions, Monitoring Time Length, Frequency of Checks, and MIL Illumination to accurately monitor and diagnose the Engine Emissions and Transmission and perform all functions required to run Modes 01 through 09 with a hand held scan tool. For a further description of the monitor strategies, a document reference has been provided throughout this GST article to the applicable OBD System Strategy document.

This GST article also contains the step by step pin point test procedures to accurately diagnose the suspected component or system once a DTC has been set. All references to repair procedures and wiring diagrams will be found within the diagnostic test procedure.

OBD Systems

OBD II

OBD is an acronym for the On Board Diagnostic System.

California OBD II applies to all gasoline engine vehicles up to 14,000 lbs. Gross Vehicle Weight Rating (GVWR) starting in the 1996 MY and all diesel engine vehicles up to 14,000 lbs. GVWR starting in the 1997 MY.

Several states in the Northeastern United States have chosen to adopt the California emission regulations starting in the 1998 MY and are known as "Green States".

Green States receive California-certified vehicles for passenger cars and light trucks up to 6,000 lbs. GVWR. Starting in the 2004 MY, Federal vehicle over 8,500 lbs. will start phasing in OBD II.

Starting in 2004 MY, gasoline-fueled Medium Duty Passenger Vehicles (MDPVs) are required to have OBD II. Federal OBD II applies to all gasoline engine vehicles up to 8,500 lbs. GVWR starting in the 1996 MY and all diesel engine vehicles up to 8,500 lbs. GVWR starting in the 1997 MY.

OBD II system implementation and operation is described in the remainder of this document.

Malfunction Indicator Lamp Illumination

MIL is an acronym for the Malfunction Indicator Lamp.

If the ECM recognizes a malfunction that leads to increased emissions values, it indicates them by lighting the MIL which is located in the instrument cluster.

The ECM switches on the MIL after the ignition is switched on. Shortly after the engine is started, The MIL goes out if the ECM does not detect a malfunction that increases the emissions values.

If the ECM recognizes a malfunction that leads to increased emissions during the operation of the engine, the ECM switches on the MIL and an entry is stored in the DTC memory of the ECM.

CAN Data Link

CAN is an acronym for Controller Area Network.

The ECM communicates with all databus capable control modules by a CAN Data Link.

The databus capable control modules (i.e. Engine Coolant temperature Sensor) are connected by two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information (messages) to the ECM. Missing information on the databus is then recognized and stored as a malfunction.

The ECM illuminates the MIL through the CAN data link and tells the MIL to turn on, turn off, or blink.

Electronic Power Control Warning Lamp

EPC is an acronym that stands for the Electronic Power Control (E-gas).

The ECM monitors all EPC components after the ignition is switched on.

If a malfunction is recognized in the EPC system during the operation of the engine, the ECM switches on the EPC which is located in the instrument cluster and an entry is stored in the DTC memory of the ECM.

Diagnostic Modes

The information provided in Modes 01 through 09 displays the various levels of emission related data that may be monitored, as well as the ability to retrieve and read stored DTC trouble codes , erase stored DTC trouble codes, generate readiness codes, and select the various PIDs and Test-IDs used within the modes to monitor the engine, and emission related component parameters.

The following table provides a link to all diagnostic modes that monitor all components and systems which influence the emission quality.

Note. Depending on scan tool and protocol used, the information in diagnostic mode 01 may be referred to by different names such as Test-ID (TID), Hex-ID, Component-ID (CID), or On-Board Diagnostic Monitor Identifier (OBDMID).

Diagnostic Mode 01 - Obtain Data

Diagnostic Mode 01 is used to display and monitor all emissions related measured values.

Test requirement

1. Coolant temperature at least 80° C.

Procedure

1. Connect the scan tool.
2. Start the engine and run at idle.
3. Select "Diagnostic Mode 1: Obtain data.".
4. From the following table, select the desired the "PID" that is to be monitored, e.g. "PID 05-Coolant temperature".

Note. More than one "PID" may be selected and monitored.

The current values of the component or system that is being monitored will be displayed on the scan tool screen.