3.2l v6 4v Generic Scan Tool, Engine Code(s): Bkh Audi A6 С6

Fuel Supply

The following table provides quick links.

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 system

1. Disconnect the battery Ground (GND) cable with the ignition switched off.
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

Note. Thoroughly clean fuel system line and hose connections and the surrounding area before disconnecting. Place removed components on a clean surface and cover. Use plastic sheeting or paper. Do not use fluffy rags that could leave lint! Carefully cover over or seal any components that have been opened if repairs are not carried out immediately. Install only clean parts: Do not remove replacement parts from the packaging until immediately before they are to be installed. Do not use parts that have been stored without packaging (e.g. in toolboxes, etc.). When the fuel system is opened: Avoid working with compressed air whenever possible. Avoid moving the vehicle if possible. Make sure that no Diesel fuel runs onto coolant hoses. Affected hoses must be cleaned immediately. Contaminated hoses must be replaced.

Fuel Pump Electrical, Checking

Special tools, testers and auxiliary items required

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

Test conditions

1. Battery voltage 12.5 V.
2. Fuse SC1 OK.
3. Fuel Pump (FP) Control Module -J538- OK
4. Fuel filter OK.

1. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check)

Scheme 773

1. Remove rear seat bench --> «72 - SEAT - FRAMES»(/audi/a6/6-2004-2008/remont/gauges-instrument-panels/#body-interior) .

Scheme 774

1. Unbolt cover for right locking flange - arrows -.
2. Disconnect electrical harness connector - arrow - at locking flange.
3. Connect a Hand held remote control (jumper) to terminal 1 using an adapter cable from connector test set.
4. Connect contact 5 to vehicle ground (GND) using a jumper cable from the connector test set.

1. Connect an alligator clip to vehicle battery positive (+).
2. Press the switch on remote control.

1. Running noise of pump must be audible.

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

If an operating noise is heard, check the voltage as shown below.

If no operating noise can be heard

Scheme 775

1. Remove fuel delivery unit. Refer to «20 - FUEL SUPPLY»(/audi/a6/6-2004-2008/remont/fuel-system/#fuel-supply-system)

Checking internal resistance

1. Using a Multimeter , check the Fuel Pump (FP) G6 electrical connector terminals 1 to 5 for continuity.

Specified value: 0 ohms.

If the specification was not obtained

1. Check the Fuel Pump (FP) G6 electrical harness connector terminals 1 to 5 for a short circuit to Battery positive (+) or an open circuit.
2. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring and the resistance value was not OK

1. Replace the Fuel Pump (FP) G6. Refer to «20 - FUEL SUPPLY»(/audi/a6/6-2004-2008/remont/fuel-system/#fuel-supply-system) .

If no malfunction is detected in the wiring and the resistance value was OK

Checking voltage

1. Switch the ignition on.
2. Press the switch on the Hand held remote control (jumper)
3. Using a Multimeter , check the Transfer Fuel Pump (FP) G6 electrical harness connector terminal 1 to Ground (GND) for voltage.
4. Switch the ignition off.

Specified value: Battery voltage.

If the specification was not obtained

1. Check the Transfer Fuel Pump (FP) G6 electrical harness connector terminal 1 to the Fuel Pump (FP) Control Module -J538- terminal 1 for an open circuit, or a short circuit to Battery positive (+) or Ground (GND).
2. Check the electrical harness connector for damage, corrosion, loose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specification was obtained

Checking Ground (GND)

1. Check the Transfer Fuel Pump (FP) G6 electrical harness connector terminal 5 to the Ground (GND) connection for an open circuit, or a short circuit to Battery positive (+) or Ground (GND).
2. Check the electrical harness connector for damage, corrosion, loose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Replace the Fuel Pump (FP) Control Module -J538-. Refer to «20 - FUEL SUPPLY»(/audi/a6/6-2004-2008/remont/fuel-system/#fuel-supply-system) .
2. Assembly is performed in the reverse of the removal.

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Fuel Delivery, Checking

Special tools, testers and auxiliary items required

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

Test conditions

1. Battery voltage 12.5 V
2. Fuel filter OK
3. Fuel tank at least 1 / 4 filled.
4. Fuel pressure regulator OK.

1. Fuel Pump (FP) Control Module -J538- OK
2. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check)

1. Remove rear seat bench --> «72 - SEAT - FRAMES»(/audi/a6/6-2004-2008/remont/gauges-instrument-panels/#body-interior)

1. Remove bolts - arrows - and remove cover for right locking flange.
2. Disconnect the electrical connector - arrow - at locking flange.
3. Connect a hand held remote control (jumper) using an adapter cable from the connector test set to contact 5.
4. Using insulating tape, tape over second contact of the remote control (jumper) to prevent a short circuit.

1. Route switch of the remote control (jumper) forward into the engine compartment.
2. Connect alligator clip to ground (GND) point in engine compartment.
3. Connect contact 1 to battery positive terminal (B+) using a self-made jumper cable. For safety reasons, install a 10 A fuse in the wiring.

Scheme 776

1. Remove fuel filler cap from fuel filler tube.
2. Pull rear engine cover off - arrows -.
3. Pull resonator upward and unclip it.

Scheme 777

1. Disconnect fuel line - arrow -.
2. Connect a pressure gauge adapter to the fuel line using the necessary adapters.
3. Connect assisting hose to pressure gauge and hold it in a measuring container.
4. Open shut-off valve of pressure gauge. Lever points in direction of flow.

1. Generate pressure in fuel system by pressing switch of remote control and slowly closing shut-off valve of pressure gauge.

1. Specification: 4 bar positive pressure.

Note. From this point on do not move position of shut-off tap.

1. Empty measuring container.
2. Press switch on remote control for 15 Sec.

Scheme 778

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

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

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

1. Fuel lines pinched
2. Fuel filter clogged
3. Fuel pump faulty

1. Assembly is performed in the reverse of the removal.

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Fuel Pump Control Module, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse SC1 OK.
2. Fuse S132 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. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check)
2. Remove access cover beneath the carpet on the passenger side of the luggage compartment Refer to --> «70 - INTERIOR TRIM»(/audi/a6/6-2004-2008/remont/gauges-instrument-panels/#body-interior)

Checking voltage

Switch the ignition on.

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

Specified value: Battery voltage

1. Switch the ignition off.

If the specified value was not obtained

1. Check the Fuel Pump (FP) Control Module J538 wiring harness terminal 3 to the Battery B (+) terminal for an open circuit or short to Ground (GND).
2. Check the Fuel Pump (FP) Control Module J538 wiring harness terminal 2 to the B (+) terminal for an open circuit or short to B+.
3. Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
4. If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

1. Switch the ignition on.
2. Using a Multimeter , check the following wiring connection for voltage.

Specified value: about 5 V

1. Switch the ignition off.

If the specified value was not obtained

1. Check the Fuel Pump (FP) Control Module J538 wiring harness terminal 5 to the Engine Control Module (ECM) J623 harness connector T94a, terminal 35 for an open circuit or short to Ground (GND).
2. Check for an open circuit or short to Ground (GND).
3. Check the electrical harness connector for damage, corrosion, loose or broken terminals.
4. If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking Ground (GND)

1. Using a Multimeter , check the Fuel Pump (FP) Control Module J538 wiring harness terminal 4/31 to chassis ground for resistance.

Specified value: 1.5 ohms maximum.

If the specified value was not obtained

1. Check the Fuel Pump (FP) Control Module J538 4/31 to ground connection 6 (main wiring harness) for an open circuit or a short to Battery (+).
2. Check the electrical harness connector for damage, corrosion, loose or broken terminals.
3. If necessary, repair the wiring connection.

If no malfunctions are found in the wiring and the voltage supply was OK

1. Replace the Fuel Pump (FP) Control Module J538. Refer to «20 - FUEL SUPPLY»(/audi/a6/6-2004-2008/remont/fuel-system/#fuel-supply-system) .
2. Perform a road test to verify repair.

If the fault does not return

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

1. End diagnosis.

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

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Assembly is performed in the reverse of the removal.

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

EVAP System

The following table provides quick links.

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, Checking for Leaks

Function

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

On the mechanical side, the leak detection system consists mainly of a vacuum-driven diaphragm pump 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 diaphragm is then moved out so that the reed contact at the operating rod remains in the "open" position.
2. During the leak diagnosis, the reed contact is monitored to check if it remains open within 10 Sec. This indicates the system is sealed.
3. If the pressure falls (indicating a leak), the diaphragm moves back and the reed contact closes.
4. If the reed contact closes within 10 Sec. of leak detection time, a further test is performed: In this case the diaphragm pump pumps four times again. The Engine Control Module (ECM) J623 measures the time for each of the four pumps until the reed contact is closed again. From that, the control module can recognize a "small leak" (greater 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.

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__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. Refer to --> «Diagnostic Mode 03 - Interrogating Fault Memory»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-03-interrogating-fault) .

EVAP Canister Purge Regulator Valve, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuses SA15 and SA18 OK.
2. Engine Component Power Supply Relay J757 OK.
3. The ignition switched off.

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

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Scheme 779

1. Remove the rear engine cover - arrows -.
2. Disconnect the electrical harness connector - 3 - from the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.

Scheme 780

Checking internal resistance

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 to 30 ohms

If the specified value is not obtained

1. Replace the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80. --> «20 - FUEL SUPPLY»(/audi/a6/6-2004-2008/remont/fuel-system/#fuel-supply-system)

If the specification is obtained

Scheme 781

Checking voltage supply

1. Using a Multimeter , check the electrical harness connector terminal 1 to 2 for voltage.
2. Operate the starter briefly.

Specified value: battery voltage

If the specified value was not obtained

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

1. Operate the starter briefly.

Specified value: battery voltage.

If the specified value was not obtained again

1. Check the wiring connection from the electrical harness connector terminal 1 to the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 3 for an open circuit according to wiring diagram.

Specified value: 1.5 ohms

1. If necessary, repair the wiring connection.

If the voltage supply is OK

Check Ground (GND) activation

1. Using a Multimeter , check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical connector terminal 2 to B+

1. Operate the starter briefly.

Specified value: battery voltage

1. Switch the ignition off.

If the specified value is not obtained

If the manufacturers test box is being used, perform the following step.

1. Install the test box VAG1598/42. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. 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 harness connector terminal 49 for resistance.

Specified value: Wire resistance max 1.5 ohms

If the specification was not obtained

1. Check the wiring for a short circuit to Battery positive (+), Ground (GND) or an open circuit.
2. Check the electrical harness connector for damage, corrosion, loose or broken terminals.
3. If necessary, repair the wiring connection.
4. If the wiring is OK, replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .

If the specification was obtained

1. Erase the DTC memory. Refer to --> «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
2. 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.
2. Assembly is performed in the reverse of the removal.

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

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Leak Detection Pump, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Fuel Pump (FP) G6 OK.
2. Leak Detection Pump (LDP) V144 fuse OK.
3. The ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Scheme 782

1. Remove the left rear wheel housing liner. --> «66 - EXTERIOR EQUIPMENT»(/audi/a6/6-2004-2008/remont/door-locks-anti-theft-systems/#body-exterior)
2. Disconnect the electrical harness connector - 3 -.

Scheme 783

Checking internal resistance

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

If the specifications are not obtained

1. Replace the Leak Detection Pump (LDP) -V144-. --> «20 - FUEL SUPPLY»(/audi/a6/6-2004-2008/remont/fuel-system/#fuel-supply-system)

If the specified values are obtained

Scheme 784

Checking voltage supply

Note. The voltage for the Leak Detection Pump (LDP) -V144- is supplied through the Engine Control Module (ECM) J623.

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

1. Operate the starter briefly.

Specified value: battery voltage.

1. Switch the ignition off.
2. Using a Multimeter , check the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 3 to the Engine Control Module (ECM) J623 connector T60, socket 45, through the Fuel Metering Valve N290 , for resistance.

Specified value: 1.5 ohms max

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, loose 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

Checking output wiring

If the manufacturers test box is being used, perform the following step.

1. Connect the test box VAG1598/42 to the wiring harness of the Engine Control Module (ECM) J623 with adapter cable VAG1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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.

Remove the Engine Control Module (ECM) J623. Refer to --> Engine Control Module, Replacing

1. Using a Multimeter , check the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 1 to Engine Control Module (ECM) J623 electrical harness connector terminal 20 for resistance.

1. Using a Multimeter , check the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 2 to Engine Control Module (ECM) J623 electrical harness connector terminal 24 for resistance.

Specified value: 1.5 ohms max.

If the specification is not obtained

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

If no malfunction is found in wiring

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing)

If the specification was obtained

1. Erase the DTC memory. Refer to --> «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
2. 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 and switch ignition off.
2. Assembly is performed in the reverse of the removal.

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Electronic Power Control

The following table provides quick.

Electronic Power Control System

With 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 the Engine Control Module (ECM) J623 through the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 located in the accelerator pedal module.

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

Operation of the throttle valve occurs through the an electric motor (throttle valve actuator) in the Throttle Valve Control Module J338. This is true across the entire engine speed and engine load spectrum.

The throttle valve is operated by the throttle valve actuator according to the instructions of the Engine Control Module (ECM) J623.

With the ignition switched on and the engine off, the Engine Control Module (ECM) J623 activates the throttle valve actuator precisely according to the sensor for accelerator pedal position. This means, if the accelerator pedal is depressed half way, the throttle valve actuator opens the throttle valve to the same degree; i.e. throttle valve would be opened half way.

With the engine running (under load), the Engine Control Module (ECM) J623 can open or close the throttle valve independently of the sensor for accelerator pedal position.

This means, 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.

The required engine torque can be achieved by the Engine Control Module (ECM) J623 through the optimal combination of throttle valve diameter and boost pressure.

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, e.g. the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 , Throttle Valve Control Module J338 , Electronic Power Control (EPC) Warning Lamp K132 , and the Engine Control Module (ECM) J623.

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 Engine Control Module (ECM) J623 fuses OK.
2. Battery voltage at least 12.5 V.
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. The Throttle Position (TP) sensor and - G79 and the Accelerator Pedal Position Sensor 2- G185 are located in one housing at the accelerator pedal. 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 --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Start diagnosis

Scheme 785

1. Remove the left knee bolster --> «68 - INTERIOR EQUIPMENT»(/audi/a6/6-2004-2008/remont/gauges-instrument-panels/#body-interior) .
2. Disconnect the electrical harness connector - 2 -.

Checking voltage supply

1. Switch the ignition on.

Scheme 786

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

1. Switch the ignition off.

If the specified values are not obtained

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

1. Install the test box VAG1598/42. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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.

Remove the Engine Control Module (ECM) J623. Refer to --> Engine Control Module, Replacing

1. Using a Multimeter , check the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 electrical harness connector terminals to the Engine Control Module (ECM) J623 electrical connector for resistance.

Specified value: Wire resistance max 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 faulty wiring connection.

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

1. Replace the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185. sensors are contained within one housing.

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

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing)

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

End diagnosis

Ignition System, Servicing

The following table provides quick links.

For all Simos 6 fuel injection system component locations. Refer to 24 - FUEL INJECTION SYSTEM .

For all Simos 6 fuel injection system removal/installation procedures and torque specifications. Refer to 24 - FUEL INJECTION 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.

Note. Thoroughly clean fuel system line and hose connections and the surrounding area before disconnecting. Place removed components on a clean surface and cover. Use plastic sheeting or paper. Do not use fluffy rags that could leave lint! Carefully cover over or seal any components that have been opened if repairs are not carried out immediately. Install only clean parts: Do not remove replacement parts from the packaging until immediately before they are to be installed. Do not use parts that have been stored without packaging (e.g. in toolboxes, etc.). When the fuel system is opened: Avoid working with compressed air whenever possible. Avoid moving the vehicle if possible. Make sure that no Diesel fuel runs onto coolant hoses. Affected hoses must be cleaned immediately. Contaminated hoses must be replaced.

Technical Data

*Not adjustable.

Components, Checking

The following table provides quick links.

Oxygen Sensor Heater before Catalytic Converter, Checking

Note. The Oxygen Sensor (O2S) Heater is part of Heated Oxygen Sensor (HO2S) and cannot be replaced separately. When servicing electrical harness connector terminals for the Heated Oxygen Sensor (HO2S) , use only gold-plated terminals.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse (in fuse panel) SA16 OK.
2. Engine Control Module (ECM) Power Supply Relay J363 OK.
3. Battery voltage at least 12.5 V.
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 --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Note. Voltage for Oxygen Sensor (O2S) Heater -Z19- (bank 1, sensor 1) and Oxygen Sensor (O2S) Heater -Z28- (bank 2, sensor 1) is supplied through the Engine Control Module (ECM) Power Supply Relay J363.

Scheme 787

Start diagnosis

1. Disconnect the 6-pin electrical harness connector - 1 - from the Heated Oxygen Sensor (HO2S) -G39- and Oxygen Sensor (O2S) Heater -Z19- (bank 1, sensor 1).

Scheme 788

To test the Oxygen Sensor (O2S) Heater -Z28- (bank 2, sensor 1), perform the following steps

1. Remove the screw - arrow - retaining the coolant reservoir.

Scheme 789

1. Disconnect the electrical connector from Engine Coolant Level (ECL) Warning Switch F66 at the bottom of the coolant reservoir and set aside the coolant reservoir with the coolant hoses - 1 - and - 2 - connected.
2. Disconnect the 6-pin electrical harness connector - 1 - from the Heated Oxygen Sensor (HO2S) -G108- and Oxygen Sensor (O2S) Heater -Z28- (bank 2, sensor 1).

Scheme 790

Checking internal resistance

1. Using a multimeter , check the Heated Oxygen Sensor (HO2S) terminals 3 to 5 for an open circuit.

Specification: 2.5 to 10 ohms (at room temperature).

If the specification is not obtained

1. Replace the Heated Oxygen Sensor (HO2S) -G39- (bank 1, sensor 1) or Heated Oxygen Sensor (HO2S) -G108- (bank 2, sensor 1) before catalytic converter. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

If the specified value is obtained

Scheme 791

Checking voltage supply

1. Using a Multimeter , check the electrical harness connector terminals for voltage.

1. Operate the starter briefly.

Specified value: battery voltage.

1. Switch the ignition off.

If no voltage is present

1. Using a multimeter , check the Heated Oxygen Sensor (HO2S) electrical harness connector terminal 5 to ground (GND) for voltage.
2. Turn key on.

1. Operate the starter briefly.

Specified value: Battery voltage.

1. Switch the ignition off.

If there is no voltage again

1. Using a multimeter , check the wiring connection from the Heated Oxygen Sensor (HO2S) electrical harness connector terminal to the Engine Control Module (ECM) Power Supply Relay J363 terminal through the fuse for resistance.

Wiring resistance: 1.5 ohms max.

1. If necessary, repair the wiring connection.
2. If the wiring is OK

Check Ground (GND) activation

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

1. Operate the starter briefly (engine can also start)

Specified value: Battery voltage, possibly fluctuating.

1. Switch the ignition off.

If the specification is not obtained

If the manufacturers test box is being used, perform the following step.

1. Install the test box VAG1598/42. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a multimeter , check the Heated Oxygen Sensor (HO2S) electrical harness connector to the Engine Control Module (ECM) J623 electrical harness connector for resistance.

Oxygen Sensor (O2S) Heater -Z19- (bank 1, sensor 1)

Oxygen Sensor (O2S) Heater -Z28- (bank 2, sensor 1)

Specified value: 1.5 ohms max.

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 malfunctions are detected

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing)
2. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Oxygen Sensor Heater after Catalytic Converter, Checking

Note. The Oxygen Sensor (O2S) Heater is part of Heated Oxygen Sensor (HO2S) and cannot be replaced separately. When servicing electrical harness connector terminals for the Heated Oxygen Sensor (HO2S) , use only gold-plated terminals.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse (in fuse panel) SA17 OK.
2. Engine Control Module (ECM) Power Supply Relay J363 OK.
3. Battery voltage at least 12.5 V.
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 --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Note. Voltage for Oxygen Sensor (O2S) Heater -Z29- (bank 1, sensor 2) and Oxygen Sensor (O2S) Heater -Z30- (bank 2, sensor 2) is supplied through the Engine Control Module (ECM) Power Supply Relay J363. Bank 1 = cylinder bank 1 in direction of travel, right; Bank 2 = cylinder bank 2 in direction of travel, left.

Start diagnosis

1. Disconnect the 4-pin electrical harness connector - 2 - from the Heated Oxygen Sensor (HO2S) -G130- and Oxygen Sensor (O2S) Heater -Z29- (bank 1, sensor 2).

To test the Oxygen Sensor (O2S) Heater -Z30- (bank 2, sensor 2), perform the following steps

1. Remove the screw - arrow - retaining the coolant reservoir.

1. Disconnect the electrical connector from Engine Coolant Level (ECL) Warning Switch F66 at the bottom of the coolant reservoir and set aside the coolant reservoir with the coolant hoses - 1 - and - 2 - connected.
2. Disconnect the 4-pin electrical harness connector - 2 - from the Heated Oxygen Sensor (HO2S) -G131- and Oxygen Sensor (O2S) Heater -Z30- (bank 2, sensor 2).

Checking internal resistance

Scheme 792

Note. Terminals - 2 - and - 3 - Are not called out in the graphic.

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

Specification: 2.5 to 10 ohms (at room temperature).

If the specification is not obtained

1. Replace the Heated Oxygen Sensor (HO2S) -G130- (bank 1, sensor 2) or Heated Oxygen Sensor (HO2S) -G131- (bank 2, sensor 2) behind Three Way Catalytic Converter (TWC).

If the specified value is obtained

Scheme 793

Checking voltage supply

1. Connect a multimeter between Heated Oxygen Sensor (HO2S) 2 G108 terminals 1 and 3 for voltage measurement.
2. Operate the starter briefly.

Specified value: Battery voltage.

1. Switch the ignition off.

If no voltage is present

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

1. Operate the starter briefly.

Specified value: Battery voltage.

1. Switch the ignition off.

If there is no voltage again

1. Using a Multimeter , check the wiring connection from the Heated Oxygen Sensor (HO2S) electrical harness connector terminal to the Engine Control Module (ECM) Power Supply Relay J363 terminal through the fuse for an open circuit.

Specified value: 1.5 ohms max.

1. If necessary, repair the wiring connection.
2. If the voltage supply is OK

Check Ground (GND) activation

1. Using a Multimeter , check the electrical harness connector for voltage.

1. Operate the starter briefly (engine can also start)

Specified value: Battery voltage, possibly fluctuating.

1. Switch the ignition off.

If the specification is not obtained

If the manufacturers test box is being used, perform the following step.

1. Install the test box VAG1598/42. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a multimeter , check the Heated Oxygen Sensor (HO2S) electrical harness connector to the Engine Control Module (ECM) J623 electrical harness connector for resistance.

1. Oxygen Sensor (O2S) Heater -Z29- (bank 1, sensor 2)

1. Oxygen Sensor (O2S) Heater -Z30- (bank 2, sensor 2)

Specified value: 1.5 ohms max.

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 malfunctions are detected

1. Replace the Engine Control Module -J623-.

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

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Throttle Valve Control Module, Checking

Note. Use only gold-plated terminals when servicing terminals in harness connector of Throttle Valve Control Module J338.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) J623 fuses OK.
2. Battery voltage at least 12.5 V.
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. Parking brake applied.
2. A/C switched off.
3. Ground (GND) connections between engine/transmission/chassis OK.
4. Throttle valve must not be damaged or dirty.

1. Coolant Temperature at least 80 C.

Function

Throttle valve operation occurs by an electric motor Throttle drive (power accelerator actuation) G186) in Throttle Valve Control Module J338. It is operated by Engine Control Module (ECM) J623 according to specifications of Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185.

Components of Throttle Valve Control Module J338

1. Throttle drive (power accelerator actuation) G186
2. Angle Sensor 1 G187
3. Angle Sensor 2 G188

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check)
2. Connect the scan tool.
3. Switch ignition on.
4. Using the scan tool, check the throttle valve position (absolute) at idle stop

1. Slowly depress the accelerator pedal to Wide Open Throttle (WOT) stop while observing the percentage display. The percentage display must increase uniformly. On vehicles with automatic transmissions do not press down beyond the kickdown point when doing this.
2. Using the scan tool, check the throttle valve position (absolute) at Wide Open Throttle (WOT) stop

1. Switch the ignition off.

If the specified values are not obtained.

Checking voltage supply

Scheme 794

1. Remove the rear engine cover - arrows -.
2. Disconnect the electrical harness connector - 1 - at the Throttle Valve Control Module J338.

1. Switch the ignition on.
2. Using the Multimeter , check the electrical harness connector for voltage.

1. Switch the ignition off.

If the specified values are not obtained.

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

1. Install the test box VAG1598/42. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a Multimeter , check the Accelerator Pedal Position Sensor 2 G185 at Throttle Valve Control Module J338 electrical harness connector terminals to the Engine Control Module (ECM) J623 electrical harness connector terminals for resistance.

Specified value: 1.5 ohms max.

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 malfunctions are detected in the wiring and if the voltage supply was OK

1. Replace the Throttle Valve Control Module J338.
2. After replacing the Throttle Valve Control Module J338 , it must be adapted. For this purpose switch on ignition for at least 30 Sec. without starting the engine or depressing the accelerator pedal.

If no malfunctions are detected in the wiring and if the voltage supply was not OK

1. Replace the Engine Control Module (ECM) J623 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Switch the ignition off.

The Engine Control Module (ECM) J623 now requires approx. 3 Sec. to store the learned value. At this time, the ignition must not be switched on again.

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

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

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 Engine Control Module (ECM) J623 fuses OK.
2. Battery voltage at least 12.5 V.
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 --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check)

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

Checking internal resistance

Scheme 795

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

Scheme 796

1. Using a multimeter , check the Engine Speed (RPM) Sensor G28 terminals1 to 2 for resistance.

Specified value: 450 to 1000 ohms.

Note. Resistance value of the engine speed (RPM) sensor is based on a temperature of 20 C. Resistance increases as temperature increases.

If specified value is not obtained

1. Replace the Engine Speed (RPM) Sensor G28. Refer to «13 - ENGINE - CRANKSHAFT, CYLINDER BLOCK»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-engine-mechanical-engine-codes-bkh)

If specified value is obtained

1. Using a Multimeter , check the electrical harness connector terminals for voltage.

Specified value: Battery voltage.

If specified value is not obtained

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

If no malfunctions are detected in the wiring and if the voltage supply was OK

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to Engine Mechanical, Fuel Injection Ignition, «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .

Using a Multimeter , check the Engine Speed (RPM) Sensor G28 electrical harness connector terminals to the Engine Control Module (ECM) J623 electrical harness connector terminals for resistance.

Specified value: 1.5 ohms max.

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 malfunctions are detected

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing)

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

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Intake Air Temperature Sensor, Checking

Note. The Intake Air Temperature (IAT) Sensor G42 and the Manifold Absolute Pressure (MAP) Sensor G71 are integrated into one unit and cannot be serviced separately.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Engine Control Module (ECM) J623 fuse OK.
2. Battery voltage at least 12.5 V.
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 --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Function test

1. Connect the scan tool.
2. Start the engine and let run at idle.
3. Using the scan tool, check the engine speed

1. End diagnosis and switch ignition off.

Note. If a temperature is indicated which differs greatly from ambient temperature of sensor, check sensor and sensor wires for contact resistances and open circuit.

1. End diagnosis and switch the ignition off.

If the specified value was not obtained

Checking voltage supply

1. Disconnect the electrical harness connector - 4 - from the Intake Air Temperature (IAT) Sensor G42.
2. Using a Multimeter , check the Intake Air Temperature (IAT) Sensor G42 electrical harness connector for voltage.

If the specified value is obtained

1. Replace the Intake Air Temperature (IAT) Sensor G42.

If specified value is not obtained

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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. Using a Multimeter , check the following wire connection 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 Battery positive (+) or an open circuit.
2. If necessary, repair the wiring connection.

If no malfunctions are found in wires

1. Replace the Engine Control Module (ECM) J623 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

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. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) J623 fuses OK.
2. Battery voltage at least 12.5 V.
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.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .
2. Connect the scan tool.
3. Switch the ignition on.
4. Using the scan tool, check the coolant temperature

Note. If a temperature is indicated which differs greatly from the ambient temperature of the sensor, check the sensor and wiring for contact resistances and open circuits.

If the specified value is obtained

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

The temperature value must increase uniformly in increments of 10 C.

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

1. Replace the Engine Coolant Temperature (ECT) Sensor G62. Refer to «19 - ENGINE - COOLING SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-engine-mechanical-engine-codes-bkh) .
2. End diagnosis and switch the ignition off.

If the indications do not resemble description

Scheme 797

Checking internal resistance

1. Disconnect electrical harness connector - 1 - from the Engine Coolant Temperature (ECT) Sensor G62.
2. Using a multimeter, check the Engine Coolant Temperature (ECT) Sensor G62 for resistance between terminals - 1 - and - 2 -.

Specified value: 450 to 1000 ohms.

If specified value is not obtained

1. Replace the Engine Coolant Temperature (ECT) Sensor G62. Refer to «19 - ENGINE - COOLING SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-engine-mechanical-engine-codes-bkh) .

If specified value is obtained

Checking voltage

1. Using a Multimeter , check the Engine Coolant Temperature (ECT) Sensor G62 electrical harness connector for voltage.

Specified value: Battery voltage.

If specified value is obtained

1. Replace the Engine Coolant Temperature (ECT) Sensor G62. --> «19 - ENGINE - COOLING SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-engine-mechanical-engine-codes-bkh) .

If the specified value was not obtained

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .

1. Using a Multimeter , check the Engine Coolant Temperature (ECT) Sensor G62 electrical harness connector terminals to the Engine Control Module (ECM) J623 electrical harness connector terminals for resistance.

Specified value: 1.5 ohms max.

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 malfunctions are found in wires

1. Replace the Engine Control Module (ECM) J623 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Fuel Pressure Sensor, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuel Pump (FP) Control Module J538 OK
2. Fuses for engine electronics OK.
3. Fuel filter OK.
4. Parking brake engaged.

1. Battery voltage at least 12.5 V.
2. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
3. All electrical consumers such as, lights and rear window defroster, switched off (radiator fan must not run during test).
4. A/C switched off.

1. The fuel tank at least 1/4 full.
2. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Scheme 798

Checking voltage

1. Disconnect the 14 pin electrical harness connector - 3 - for Fuel Pressure Sensor G247 from the left rear of the engine.
2. Using a Multimeter , check the Fuel Pressure Sensor G247 for voltage at the 14 pin electrical harness connector terminals.

If specified value is obtained

1. Replace the Fuel Pressure Sensor G247. Refer to «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-engine-mechanical-engine-codes-bkh)

If the specified value was not obtained

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a Multimeter , check the following wire connections 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 Battery positive (+) or an open circuit.
2. If necessary, repair the wiring connection.

If no malfunctions are found in wiring

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing)
2. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Low Fuel Pressure Sensor, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuel Pump (FP) Control Module J538 OK
2. Fuses for engine electronics OK.
3. Fuel filter OK.
4. Parking brake engaged.

1. Battery voltage at least 12.5 V.
2. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
3. All electrical consumers such as, lights and rear window defroster, switched off (radiator fan must not run during test).
4. A/C switched off.

1. The fuel tank at least 1/4 full.
2. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Scheme 799

Checking voltage

1. Disconnect the electrical harness connector - 1 - from the Low Fuel Pressure Sensor G410.

1. Using a Multimeter , check the electrical harness connector terminals for voltage.

If specified value is obtained

1. Replace the Low Fuel Pressure Sensor G410.

Refer to 24 - FUEL INJECTION SYSTEM .

Note. The 3.2L 6-Cyl. 4V (BKH) engine is equipped with two different Low Fuel Pressure Sensors G410 designs. One design is integrated into the high pressure fuel pump and must be replaced as a complete assembly. The second design is not integrated into the high pressure fuel pump and may be replaced separately.

If the specified value was not obtained

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a Multimeter , check the following wire connections 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 Battery positive (+) or an open circuit.
2. If necessary, repair the wiring connection.

If no malfunctions are found in wiring

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing)
2. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Fuel Metering Valve, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuel Pump (FP) Control Module J538 OK
2. Fuses for engine electronics OK.
3. Fuel filter OK.
4. Parking brake engaged.

1. Battery voltage at least 12.5 V.
2. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
3. All electrical consumers such as, lights and rear window defroster, switched off (radiator fan must not run during test).
4. A/C switched off.

1. The fuel tank at least 1/4 full.
2. Ignition switched off.

Test procedure

Scheme 800

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

1. Remove three screws - arrows - and the engine lifting eye to gain access to the electrical harness connector.
2. Disconnect the Fuel Metering Valve N290 electrical harness connector - 2 - from the Fuel Metering Valve N290.

Checking internal resistance

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

Specified value: 450 to 1000 ohms.

If specified value is not obtained

1. Replace the Fuel Metering Valve N290.

Refer to 24 - FUEL INJECTION SYSTEM .

If specified value is obtained

Checking voltage

1. Using a Multimeter , check the wiring connection from the Fuel Metering Valve N290 electrical harness connector terminals for voltage.

1. Operate the starter briefly.

Specified value: Battery voltage.

1. Switch the ignition off.

If there is no voltage

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a Multimeter , check the following wire connections 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 Battery positive (+) or an open circuit.

If specified value is not obtained

1. If necessary, repair the wiring connection.

If no malfunctions are found in wiring

1. Replace the Engine Control Module (ECM) J623.
2. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Intake Manifold Tuning Valve Position Sensor, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuses for engine electronics OK.
2. Parking brake engaged.
3. Battery voltage at least 12.5 V.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. All electrical consumers such as, lights and rear window defroster, switched off (radiator fan must not run during test).
2. A/C switched off.
3. The fuel tank at least 1/4 full.
4. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Checking voltage supply

1. Disconnect the electrical harness connector from the Intake Manifold Tuning (IMT) Valve Position Sensor G513 - 3 -.
2. Using a Multimeter , check the electrical harness connector for voltage.

If specified value is obtained

1. Replace the Intake Manifold Tuning (IMT) Valve Position Sensor G513. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

If specified value is not obtained

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a Multimeter , check the following electrical wiring harness 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 Battery positive (+) or an open circuit.
2. If necessary, repair the wiring connection.

If no malfunctions are found in wires

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing)
2. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Intake Manifold Runner Control Valve, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuses for engine electronics OK.
2. Parking brake engaged.
3. Battery voltage at least 12.5 V.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. All electrical consumers such as, lights and rear window defroster, switched off (radiator fan must not run during test).
2. A/C switched off.
3. The fuel tank at least 1/4 full.
4. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .
2. Disconnect the electrical harness connector - 5 - from the Intake Manifold Runner Control (IMRC) Valve N316.

Checking internal resistance

1. Using a Multimeter , check the Intake Manifold Runner Control (IMRC) Valve N316 for resistance

Specified value: 450 to 1000 ohms.

If specified value is not obtained

1. Replace the Intake Manifold Runner Control (IMRC) Valve N316. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

If specified value is obtained

Checking voltage

1. Using a Multimeter , Check the wiring connection from the electrical harness connector terminal to the Engine Control Module (ECM) Power Supply Relay J363 terminal through the fuse for an open circuit.

1. Operate the starter briefly.

Specified value: Battery voltage.

1. Switch the ignition off.

If there is no voltage

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing)
2. Using a Multimeter , check the following wire connection 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 Battery positive (+) or an open circuit.

If specified value is not obtained

1. If necessary, repair the wiring connection.

If no malfunctions are found in wiring

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Intake Manifold Runner Position Sensor 1, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuses for engine electronics OK.
2. Parking brake engaged.
3. Battery voltage at least 12.5 V.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. All electrical consumers such as, lights and rear window defroster, switched off (radiator fan must not run during test).
2. A/C switched off.
3. The fuel tank at least 1/4 full.
4. Ignition switched off.

Test procedure

Scheme 801

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .
2. Disconnect the electrical harness connector from the Intake Manifold Runner Position Sensor G336 - 1 -.

Checking voltage supply

1. Using a Multimeter , check the electrical harness connector for voltage.

If specified value is obtained

1. Replace the Intake Manifold Runner Position Sensor G336. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

If specified value is not obtained

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a Multimeter , check the following wire connector 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 Battery positive (+) or an open circuit.
2. If necessary, repair the wiring connection.

If no malfunctions are found in wires

1. Replace the Engine Control Module (ECM) J623 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .

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 Sec.
2. The Engine Control Module (ECM) J623 will automatically adapt the Intake Manifold Runner Position Sensor G336.
3. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Intake Manifold Runner Position Sensor 2, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuses for engine electronics OK.
2. Parking brake engaged.
3. Battery voltage at least 12.5 V.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. All electrical consumers such as, lights and rear window defroster, switched off (radiator fan must not run during test).
2. A/C switched off.
3. The fuel tank at least 1/4 full.
4. Ignition switched off.

Test procedure

Scheme 802

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .
2. Disconnect the electrical harness connector from the Intake Manifold Runner Position Sensor 2 G512 - 1 -.

Checking voltage supply

1. Using a Multimeter , check the electrical harness connector terminals for voltage.

If specified value is obtained

1. Replace the Intake Manifold Runner Position Sensor 2 G512. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

If specified value is not obtained

Checking wiring connections

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a Multimeter , check the following electrical harness connector 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 Battery positive (+) or an open circuit.
2. If necessary, repair the wiring connection.

If no malfunctions are found in wires

1. Replace the Engine Control Module (ECM) J623 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .

The Intake Manifold Runner Position Sensor 2 G512 must be adapted to the Engine Control Module (ECM) J623.

To adapt the Intake Manifold Runner Position Sensor 2 G512 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 Sec.
2. The Engine Control Module (ECM) J623 will automatically adapt the Intake Manifold Runner Position Sensor 2 G512.
3. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Fuel Injectors, Checking

The following test procedure is used to diagnose Fuel Injectors N30, N31, N32, N33, N83, and N84.

Special tools, testers and auxiliary items required

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

Test requirements

1. Fuses for engine electronics OK.
2. Parking brake engaged.
3. Battery voltage at least 12.5 V.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

1. All electrical consumers such as, lights and rear window defroster, switched off (radiator fan must not run during test).
2. A/C switched off.
3. The fuel tank at least 1/4 full.
4. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Scheme 803

Right bank

1. Disconnect the 6 pin electrical harness connector - 1 - for Fuel Injectors N30, N31, N32 from the right rear of the engine.

Left bank

1. Disconnect the 14 pin electrical harness connector - 3 - for Fuel Injectors N33, N83, N84 from the left rear of the engine.

Checking internal resistance

1. Using a Multimeter , check the fuel injector electrical terminals for resistance.

Right bank

Left bank

Specified value: 12 to 13 ohms (at room temperature)

Note. With an engine at operating temperature, the resistance of the fuel injectors increases by approx. 4 to 6 ohms.

If the specified value is not obtained

1. Replace the faulty fuel injector. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

If the specified value is obtained

Checking activation

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

Right bank

Left bank

1. Operate the starter and test the activation of the Fuel Injector.

LED should flicker.

Note. LEDs do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little and then get slightly brighter during activation.

1. Switch the ignition off.

If LED flickers

1. Replace the faulty Fuel Injector. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

If LED does not flicker

Checking voltage supply

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

Right bank

Left bank

1. Operate the starter briefly.

Specified value: Battery voltage.

1. Switch the ignition off.

If the specification is not obtained

1. Check the electrical harness connector for damage, corrosion, loose or broken terminals.
2. If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking wiring

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing)

Right bank

Left bank

Using a Multimeter , check the Fuel Injector electrical harness connector terminals to the Engine Control Module (ECM) J623

Specified value: 1.5 ohms max

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 malfunctions are found in wiring

1. Replace the Engine Control Module (ECM) J623 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Functions, Checking

The following table provides quick links.

Heated Oxygen Sensor before Catalytic Converter, Checking

This procedure is used to check both Heated Oxygen Sensors (HO2S) -G39-, -G108

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Heated Oxygen Sensor (HO2S) G39, G108.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuses for engine electronics OK.
2. Battery voltage at least 12.5 V.
3. All electrical consumers such as, lights and rear window defroster, switched off (radiator fan must NOT run during test).
4. Ground (GND) connections between engine/transmission/chassis OK.

1. Oxygen sensor heater OK.
2. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
3. The exhaust system free of leaks.
4. The parking brake engaged.

1. The A/C switched off.
2. The coolant temperature at least 80 C.
3. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .
2. Perform the function test in Diagnostic Mode 06. Refer to --> «Diagnostic Mode 06 - Checking Test Results of Components Not Continuously Monitored»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-06-checking-test) .

If specified values are obtained

1. End diagnosis and switch the ignition off.

If the specified values are not obtained

Checking primary voltage

1. Disconnect the 6-pin electrical harness connector - 1 - from the Heated Oxygen Sensor (HO2S) -G39- and Oxygen Sensor (O2S) Heater -Z19- (bank 1, sensor 1).

To test the Heated Oxygen Sensor (HO2S) -G108- (bank 2, sensor 1), perform the following steps

1. Remove the screw - arrow - retaining the coolant reservoir.
2. Disconnect the electrical connector from Engine Coolant Level (ECL) Warning Switch F66 at the bottom of the coolant reservoir and set aside the coolant reservoir with the coolant hoses - 1 - and - 2 - connected.
3. Disconnect the 6-pin electrical harness connector - 1 - from the Heated Oxygen Sensor (HO2S) -G108- and Oxygen Sensor (O2S) Heater -Z28- (bank 2, sensor 1).

The test procedures for the Heated Oxygen Sensor (HO2S) -G39- are the same for the Heated Oxygen Sensor (HO2S) -G108-.

1. Using a multimeter , check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminals 4 to 6 for voltage.

Specified value: 0.400 to 0.500 V

1. Switch the ignition off.

If the specified value was not obtained

1. Replace the Heated Oxygen Sensor (HO2S) G39. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .

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

1. Heated Oxygen Sensor (HO2S) -G39- (Bank 1, Sensor 1).

1. Heated Oxygen Sensor (HO2S) -G108- (Bank 2, Sensor 1).

Specified value: 1.5 ohms max.

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 malfunctions are found in wiring

1. Replace Heated Oxygen Sensor (HO2S) -G139- or Heated Oxygen Sensor (HO2S) -G108-. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .
2. Erase the DTC memory. Refer to --> «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. 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 the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Heated Oxygen Sensor after Catalytic Converter, Checking

This procedure is used to check both Heated Oxygen Sensors (HO2S) -G130-, -G131

Note. When servicing terminals in harness connector of oxygen sensor, use only gold-plated terminals.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuses for engine electronics OK.
2. Battery voltage at least 12.5 V.
3. All electrical consumers such as, lights and rear window defroster, switched off (radiator fan must NOT run during test).
4. Ground (GND) connections between engine/transmission/chassis OK.

1. Oxygen sensor heater OK.
2. Vehicles with automatic transmission, shift selector lever into position "P" or "N".
3. The exhaust system free of leaks.
4. The parking brake engaged.

1. The A/C switched off.
2. The coolant temperature at least 80 C.
3. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .
2. Perform the function test in Diagnostic Mode 06. Refer to --> «Diagnostic Mode 06 - Checking Test Results of Components Not Continuously Monitored»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-06-checking-test) .

If specified values are obtained

1. End diagnosis and switch the ignition off.

If the specified values are not obtained

Checking primary voltage

1. Disconnect the 4-pin electrical harness connector - 2 - from Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 and Oxygen Sensor (O2S) Heater -Z29- (bank 1, sensor 2).
2. Remove the screw - arrow - retaining the coolant reservoir.

1. Disconnect the electrical connector from Engine Coolant Level (ECL) Warning Switch F66 at the bottom of the coolant reservoir and set aside the coolant reservoir with the coolant hoses - 1 - and - 2 - connected.

1. Disconnect the electrical 4-pin harness connector - 2 - from Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 and Oxygen Sensor (O2S) Heater 2 (behind Three Way Catalytic Converter (TWC)) Z30 (bank 2, sensor 2).
2. Using a Multimeter , check the electrical harness connector terminals 3 to 4 for voltage.
3. Switch ignition on.

Specified value: 0.400 to 0.500 V

1. Switch ignition off.

If specified value is obtained

1. Replace Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 or Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

If specified value is not obtained

Checking wiring

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing)

Using a Multimeter , check the Heated Oxygen Sensor (HO2S) 2 G108 electrical harness connector terminals to the Engine Control Module (ECM) J623 electrical harness connector terminals for resistance.

1. Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130

1. Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G131

Specified value: 1.5 ohms max.

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 malfunctions are found in wiring

1. Replace Heated Oxygen Sensor (HO2S) -G130- or Heated Oxygen Sensor (HO2S) -G131-. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .
2. Erase the DTC memory. Refer to --> «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. 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 the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

SIMOS Control Module

The following table provides quick links.

Function

The 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 Fuel Pump (FP) Control Module J538 as well as On Board Diagnostics (OBD).

Engine Control Module Voltage Supply, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuses SA14, SA15 and SA18 OK.
2. Battery voltage at least 12.5 V.
3. The Ground (GND) connections at the engine and transmission OK.
4. The generator OK.

1. The ignition is switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .

Checking voltage supply

Using a Multimeter , check the electrical harness connector terminals to the Engine Control Module (ECM) J623 electrical harness connector terminals for voltage.

1. Switch the ignition off.

Specified value: Battery voltage.

If the specified value was not obtained

1. Check the Engine Control Module (ECM) J623 electrical harness connector terminal 92 to the Engine Control Module (ECM) Power Supply Relay J363 terminal 3/86 for an open circuit or short to Ground (GND).
2. Check the Engine Control Module (ECM) J623 electrical harness connector terminal 69 to Engine Control Module (ECM) Power Supply Relay J363 terminal 4/85 for an open circuit or short to Ground (GND).

If the specified values are not obtained

1. Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
2. If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

1. Check the Engine Control Module (ECM) Power Supply Relay J363. --> «Engine Control Module Power Supply Relay, Checking»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-power-supply-relay)

Checking Ground (GND)

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

Specified value: 1.5 ohms max.

If any of the specified values are not obtained

1. Check the electrical harness connector for damage, corrosion, loose or broken terminals.
2. If necessary, repair the wiring connection.

If no malfunctions are found in the wiring and the voltage supply was OK

1. Perform a road test to verify any electrical repairs.

If the fault does not return

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

1. End diagnosis.

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

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Assembly is performed in the reverse of the removal.

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Engine Control Module Power Supply Relay, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Note. The Engine Control Module (ECM) Power Supply Relay J363 supplies voltage to the ignition coils with power output stages and a few additional components. With the ignition switched on, 12 V must be present at the respective ignition coil connector, terminal 1.

Test requirement

1. Fuses SA14, SA15 and SA18 OK.
2. Battery voltage at least 12.5 V.
3. The Ground (GND) connections at the engine and transmission OK.
4. The generator OK.

1. The ignition is switched off.

Test procedure

Scheme 804

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .
2. Remove the rubber seal - 1 - from the plenum chamber cover.

Scheme 805

1. Remove the plenum chamber cover - 2 -.
2. Using a screwdriver, remove the wiper arms caps - arrows -.
3. Loosen the wiper arm nuts - arrows - several turns.
4. Loosen wiper arms by gently rocking.

Scheme 806

1. Remove wiper arm nuts and wiper arms.
2. Remove the screws - arrows - retaining the cowl grill - 1 -.

Scheme 807

1. Remove the cowl grill from the windshield.

Scheme 808

1. Remove the screws - arrows - and electronics box cover from the electronics box.
2. Remove the Engine Control Module (ECM) Power Supply Relay J363 - 3 - from the electronics box.

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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 --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .

Checking voltage supply

1. Switch the ignition on.

Scheme 809

Using a Multimeter , check the electrical harness connector terminals to the Engine Control Module (ECM) J623 electrical harness connector terminals for voltage.

Specified value: Battery voltage

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 malfunctions are found in the wiring

1. Using a Multimeter or equivalent, check the following wiring connections for voltage according to wiring diagram

Switch the ignition off.

Specified value: Battery voltage.

If the specified value is not obtained

1. Check the wiring connections for an open circuit according to the wiring diagram.

Specified value: Wire resistance max 1.5 ohms.

If no malfunctions are found in the wiring

Checking wire connection

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

Specified value: Wire resistance max 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 malfunctions are detected

1. Replace the Engine Control Module (ECM) Power Supply Relay J363. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

Assembly is performed in the reverse order of the removal.

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Engine Control Module, Replacing

Engine Control Module (ECM) J623 Removal

Special tools, testers and auxiliary items required

1. Heat gun

Note. 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 Engine Control Module (ECM) J623. So that this system cannot be circumvented, it is necessary to perform adaptation of the anti-theft immobilizer using the Vehicle Diagnosis Service Syst. VAS5052 in the On Board Diagnostic (OBD) function. The great availability of equipment options makes adaptation of the Engine Control Module (ECM) J623 necessary (e.g. cruise control system). This "writing" function is not possible with the generic scan tool, therefore it is necessary to use the Vehicle Diagnosis Service Syst. VAS5052 in On Board Diagnostic (OBD) function for this purpose. If the Engine Control Module (ECM) J623 must be replaced, the vehicle may be taken to the nearest Audi dealership When the electrical connector is disconnected from the Engine Control Module (ECM) -J623- , adaptation values are erased and content of the DTC memory remains intact.

Check the identification of the previous Engine Control Module (ECM) J623 as follows

1. Connect the scan tool.
2. Switch the ignition on.
3. Using the scan tool, select "Vehicle information".
4. Select " Calibration Identification" in vehicle information.

The electronic control module identification number will be displayed, e.g. 06A906032NA 4983

1. Record the electronic control module identification number.

1. End diagnosis and switch the ignition off.
2. Remove the rubber seal - 1 - from the plenum chamber cover.

1. Remove the plenum chamber cover - 2 -.
2. Using a screwdriver, remove the wiper arms caps - arrows -.
3. Loosen the wiper arm nuts - arrows - several turns.
4. Loosen wiper arms by gently rocking.

1. Remove wiper arm nuts and wiper arms.
2. Remove the screws - arrows - retaining the cowl grill - 1 -.

Scheme 810

1. Remove the cowl grill from the windshield.

Scheme 811

1. Remove the screws - arrows - and the electronics box cover from the electronics box.
2. Using a screwdriver - arrows 1 and 2 - , carefully remove the retaining clip - 2 -.

Scheme 812

Note. The threads of both shear bolts - 3 - , that are screwed into the ECM, are not coated with a locking compound. The threads in the ECM housing must not be heated and do not require to be heated (unintentional heating of the ECM).

Scheme 813

1. Using the heat gun , heat the shear bolts as follows
2. Direct the heat gun nozzle at the shear bolts of the protective housing.

Scheme 814

1. Switch heat gun on and heat bolt for approx. 20 to 25 Sec.

1. Remove shear bolts with locking pliers - arrow -.
2. Remove the electrical harness connector retaining brackets and the electrical harness connectors from the Engine Control Module (ECM) J623.
3. Remove the Engine Control Module (ECM) J623.

Engine Control Module (ECM) J623 Installation

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

Note. New shear bolts must be used when reinstalling the electrical harness connector retaining brackets to the Engine Control Module (ECM) J623.

Engine Control Module (ECM) J623 reprogramming

1. The new Engine Control Module (ECM) J623 and immobilizer must be activated.

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Additional Signals, Checking

The following table provides quick links.

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 requirement

1. The function and display of the Speedometer OK.
2. The Engine Control Module (ECM) J623 fuses OK.
3. Battery voltage at least 12.5 V.
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.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .
2. Connect the scan tool.
3. Perform a road test with a vehicle speed greater than 5 Km/h.
4. Using the scan tool, have an assistant observe the reading on the display

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. End the diagnosis and switch ignition off.

If no speed is displayed

The speed signal is transferred from the Engine Control Module (ECM) J623 to the instrument cluster through the wire connection or through the CAN-Bus, depending on version.

1. Check the wiring connections.
2. Check the terminal resistance for CAN-Bus Refer to --> «Can-Bus Terminal Resistance, Checking»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__can-bus-terminal-resistance-checking)

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Can-Bus Terminal Resistance, Checking

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. Battery voltage at least 12.5 V.
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 Engine Control Module (ECM) communicates with 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 Engine Control Module (ECM) 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 inside the Engine Control Module (ECM).

If the CAN-Bus communication is interrupted. Communication from the scan tool to the Engine Control Module (ECM) may not be possible.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1 to the Engine Control Module (ECM) J623. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a Multimeter , check the central termination resistor by checking for resistance between terminals 58 and 60 of the Engine Control Module (ECM) J623.

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

If the specified value was not obtained

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .

If the specified value was obtained

Checking wiring

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1 to the Engine Control Module (ECM) J623 wiring harness connector. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

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

1. Using a Multimeter , check the central termination resistor by checking for resistance between terminals 58 and 60 of the Engine Control Module (ECM) J623 electrical harness connector A (T81).

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, loose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring

1. Erase the DTC memory. Refer to --> «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
2. 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 the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .

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

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Exhaust System Components, Removing and Installing

The following table provides quick links.

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 V.
2. Oxygen Sensors OK.
3. No leaks or damage to exhaust system.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check)

Function test

1. Perform the function test in Diagnostic Mode 06. Refer to --> «Diagnostic Mode 06 - Checking Test Results of Components Not Continuously Monitored»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-06-checking-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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__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/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-engine-mechanical-engine-codes-bkh) .

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Note. Thoroughly clean fuel system line and hose connections and the surrounding area before disconnecting. Place removed components on a clean surface and cover. Use plastic sheeting or paper. Do not use fluffy rags that could leave lint! Carefully cover over or seal any components that have been opened if repairs are not carried out immediately. Install only clean parts: Do not remove replacement parts from the packaging until immediately before they are to be installed. Do not use parts that have been stored without packaging (e.g. in toolboxes, etc.). When the fuel system is opened: Avoid working with compressed air whenever possible. Avoid moving the vehicle if possible. Make sure that no Diesel fuel runs onto coolant hoses. Affected hoses must be cleaned immediately. Contaminated hoses must be replaced.

General Information

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

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

Technical Data, Spark Plugs

1) Not adjustable.

Ignition Coil with Power Output Stage, Checking

The following procedure is used to diagnose Ignition Coils with Power Output Stage N70, N127, N291, N292, N323, N324.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Diode test lamp.
3. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) J623 fuses OK.
2. Engine Control Module (ECM) Power Supply Relay J363 OK.
3. Engine Speed (RPM) Sensor G28 OK.
4. Battery voltage at least 12.5 V.

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

1. Ignition switched off.

Test procedure

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Note. The ignition coils and power output stages are one component and cannot be replaced individually.

Scheme 815

Start diagnosis

1. Remove the front engine cover - arrows -.
2. Remove the rear engine cover - arrows -.

Scheme 816

Cylinder bank 1 (right)

1. Remove the air duct screws - arrows -.

Scheme 817

1. Remove the air ducts - 1 - and - 2 -.
2. Remove the check valve - 1 - from the air duct hose.

1. Loosen the hose clamp - 2 - , release the retaining clips - arrows - , and remove the air duct hose.

Scheme 818

1. Disconnect the electrical harness connectors at the Engine Coolant Temperature (ECT) Sensor G62 - 1 - , Intake Manifold Flap Change-over Valve N239 - 2 - , and the Intake Manifold Tuning (IMT) Valve Position Sensor (P2076) G513 - 3 -.
2. Disconnect the electrical harness connectors from the following

Camshaft Adjustment Valve 1 (exhaust) N318 - 1

Camshaft Adjustment Valve 1 N205. - 2

Camshaft Position (CMP) Sensor G40. - 3

Intake Manifold Runner Position Sensor G336. - 4

Camshaft Position (CMP) Sensor 3 G300. - 5

1. Remove the screws - arrows - and disconnect the electrical connections at the ignition coils.

Cylinder bank 2 (left)

1. Remove the screw - arrow - retaining the coolant reservoir.

Scheme 819

1. Disconnect the electrical connector from Engine Coolant Level (ECL) Warning Switch F66 at the bottom of the coolant reservoir and set aside the coolant reservoir with the coolant hoses - 1 - and - 2 - connected.

Scheme 820

1. Disconnect the electrical connector from the high pressure fuel pump - 2 -.
2. Disconnect the electrical harness connectors from the following

Camshaft Position (CMP) Sensor 2 G163 - 1

Camshaft Adjustment Valve 2 N208 - 2

Camshaft Adjustment Valve 2 (exhaust) N319 - 3

Camshaft Position (CMP) Sensor 4 G301 - 4

1. Remove the screws - arrows - and disconnect the electrical connections at the ignition coils.

Checking voltage supply

1. Using the Diode test lamp , check the following wiring connections for voltage according to the wiring diagram

The LED must light up.

Switch the ignition off.

If the LED does not light up

1. Using a Multimeter , check the following wire connections for an open circuit according to wiring diagram

Specified value: 1.5 ohms max.

If specified value is not obtained

1. Repair wiring.
2. Switch the ignition on.
3. Using a Multimeter , check the following wire connection for voltage according to wiring diagram

Specified value: Battery voltage

1. Switch the ignition off.

If the specified value is not obtained

1. Repair wiring.

If the specified value is obtained

Checking activation of power output stages

1. Remove the rubber seal - 1 - from the plenum chamber cover.

1. Remove the plenum chamber cover - 2 -.
2. Using a screwdriver, remove the wiper arms caps - arrows -.
3. Loosen the wiper arm nuts - arrows - several turns.
4. Loosen wiper arms by gently rocking.

1. Remove wiper arm nuts and wiper arms.
2. Remove the screws - arrows - retaining the cowl grill - 1 -.

1. Remove the cowl grill from the windshield.

Scheme 821

1. Remove the screws - arrows - and electronics box cover from the electronics box.

1. Remove the Engine Control Module (ECM) Power Supply Relay J363 from the relay carrier in the electronics box.
2. Using a Multimeter , check the following for resistance
3. Check the wiring connection from the power supply relay carrier position 3 (wiring harness connector), terminal 2 to the ignition coil wiring harness connector terminal 1.

Specified value: 1.5 ohms max.

If specified value is not obtained

1. Repair the wiring.

If the specified value is obtained

1. Replace the relevant ignition coil. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

Note. Fuel must not be injected during the test to avoid damaging the catalytic converter.

1. Disconnect the fuel injector wiring harness electrical connector - 1 -.
2. Using a diode test lamp , check the Ignition Coil electrical harness connector terminals 2 to 3 for voltage.
3. Operate the starter briefly.

The LED must blink (brief blink signal).

1. Switch the ignition off.

If the LED blinks

1. Replace the relevant, ignition coil with power output stage.

If the LED does not blink

If the manufacturers test box is being used, perform the following step.

1. Connect the Test Box 105 Pin VAG1598/42 with Adapter Cable 1598/39-1. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a Multimeter , check the following wire connections 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 Battery positive (+) or an open circuit.
2. If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .

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

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Knock Sensor, Checking

The following procedure is used to check Knock Sensor (KS) 1 G61 and Knock Sensor (KS) 2 G66.

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Knock Sensor (KS) 1 G61.

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 Engine Control Module (ECM) J623 fuses OK.
3. Battery voltage at least 12.5 V.
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 --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Note. The knock sensor electrical connectors can be identified by color. Knock Sensor (KS) 1 -G61- (Bank 1) is green. Knock Sensor (KS) 2 -G66- (Bank 2) is gray.

1. Disconnect the electrical harness connector - 1 - or - 2 - of the respective knock sensor.

1 - Knock Sensor (KS) 1 -G61-.

2 - Knock sensor (KS) 2 -G66-.

Checking internal resistance

Scheme 822

1. Using a Multimeter , check as follows
2. Using a Multimeter , check the Knock Sensor (KS) 1 G61
3. or Knock Sensor (KS) 2 G66 terminals 1 to 2, 2 to 3, and 1 to 3 for an internal short.

Specified value: infinity (Infinity).

If the specified value was not obtained

1. Replace Knock Sensor (KS) 1 G61 or Knock Sensor (KS) 2 G66 as necessary. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

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 VAG1598/42. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a Multimeter , check the knock sensor electrical harness connector to the Engine Control Module (ECM) J623 electrical harness connector for resistance.

1. Knock Sensor (KS) 1 -G61

1. Knock Sensor (KS) 2 -G66

Specified value: 1.5 ohms max.

If the specified value was 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 the wiring and the resistance was not OK

1. Replace Knock Sensor (KS) 1 G61. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .
2. Erase the DTC memory. Refer to --> «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. 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 the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Assembly is performed in the reverse of the 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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Camshaft Position Sensors, Checking

This procedure is used to check Camshaft Position (CMP) Sensors G40, G300, G163, G301.

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

Special tools, testers and auxiliary items required

1. Multimeter.
2. Diode test lamp.
3. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) J623 fuses OK.
2. Engine Control Module (ECM) Power Supply Relay J363 OK.
3. Battery voltage at least 12.5 V.
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 --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

1. Remove the front engine cover - arrows -.
2. Remove the rear engine cover - arrows -.

Checking activation

1. Using the Diode test lamp , check for voltage between terminal 2 (CMP sensor signal) and terminal 1 (B+) with the electrical harness connector connected to the Camshaft Position (CMP) Sensor.
2. Operate the starter for a few Sec.

The LED must blink.

Note. Voltage testers do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little and then get significantly brighter during activation.

1. Switch ignition off.

If the LED blinks

Replace the relevant Camshaft Position (CMP) Sensor. Refer to 24 - FUEL INJECTION SYSTEM .

If the LED does not blink

Checking voltage supply

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

1. Using a Multimeter , check the Camshaft Position (CMP) Sensor electrical harness connector terminal 1 to engine ground for voltage.

Specified value: about 5 V.

1. Switch the ignition off.

Checking signal wire

1. Using a Multimeter , Check the Camshaft Position (CMP) Sensor electrical harness connector terminal 2 to engine ground for voltage.

1. Switch the ignition on.

Specified value: Battery voltage.

1. Switch the ignition off.

Checking Ground (GND)

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

Specified value: about 10 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 VAG1598/42. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a Multimeter , Check the Camshaft Position (CMP) Sensor electrical harness connector to the Engine Control Module (ECM) J623 electrical harness connector for resistance.

1. Camshaft Position (CMP) Sensor G40 (bank 1).

1. Camshaft Position (CMP) Sensor 2 G163 (bank 2).

1. Camshaft Position (CMP) Sensor 3 G300 (bank 1).

1. Camshaft Position (CMP) Sensor 4 G301 (bank 2).

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 can be found

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing)

Assembly is performed in the reverse order of removal.

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Camshaft Adjustment Valve, Checking

This procedure is used to check the Camshaft Adjustment Valves N205, N208, N318, N319.

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Camshaft Adjustment Valves N205, N208, N318, N319.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Diode test lamp.
3. Wiring diagram.

Test requirements

1. The Engine Control Module (ECM) J623 fuses OK.
2. Engine Control Module (ECM) Power Supply Relay J363 OK.
3. Battery voltage at least 12.5 V.
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 --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Note. Voltage for camshaft adjustment solenoid valves is supplied through the Engine Control Module (ECM) Power Supply Relay J363.

Cylinder bank 1 (right)

1. Disconnect the electrical harness connectors from Camshaft Adjustment Valve 1 (exhaust) N318 - 1 - and Camshaft Adjustment Valve 1 N205 - 2 -.

Cylinder bank 2 (left)

1. Remove the screw - arrow - retaining the coolant reservoir.

1. Disconnect the electrical connector from Engine Coolant Level (ECL) Warning Switch F66 at the bottom of the coolant reservoir and set aside the coolant reservoir with the coolant hoses - 1 - and - 2 - connected.
2. Disconnect the electrical harness connectors from Camshaft Adjustment Valve 2 (exhaust) N319 - 3 - and Camshaft Adjustment Valve 2 N208 - 2 -.

Checking internal resistance

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

Specified value: 8 to 13 ohms.

If specified value is not obtained

1. Replace the respective Camshaft Adjustment Valve. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

If specified value is obtained

Checking voltage supply

1. Using the Diode test lamp , check the following wiring connection for voltage according to the wiring diagram.

1. Switch ignition on.

LED must light up.

If LED does not light up

1. Check wiring connection from terminal 1 of the Camshaft Adjustment Valve electrical harness connector through the fuse to the Engine Control Module (ECM) Power Supply Relay J363 electrical harness connector terminal 2/87 for an open circuit according to wiring diagram

Specified value: 1.5 ohms max.

1. If necessary, repair the wiring connection.

If voltage supply is OK

Checking wiring

If the manufacturers test box is being used, perform the following step.

1. Install the test box VAG1598/42. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing) .
2. Using a Multimeter , Check the Camshaft Adjustment Valve electrical harness connector to the Engine Control Module (ECM) J623 electrical harness connector for resistance.

1. Camshaft Adjustment Valve 1 N205 (bank 1).

1. Camshaft Adjustment Valve 1 (exhaust) N318 (bank 1).

1. Camshaft Adjustment Valve 2 N208 (bank 2).

1. Camshaft Adjustment Valve 2 (exhaust) N319 (bank 2).

Specified value: 1.5 ohms max.

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 malfunctions are found in the wiring

1. Replace the Engine Control Module (ECM) J623. Refer to --> «Engine Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__engine-control-module-replacing)

If no malfunctions are detected

1. Replace the relevant Camshaft Adjustment Valve. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/remont/cooling-fan/#32-v6-4v-fuel-injection-ignition-engine-codes-bkh) .

Assembly is performed in the reverse order of removal.

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Transmission Regulating Electrical Components, Checking

The following table provides quick links.

For all Automatic Transmission- Gears, Hydraulic controls component locations. Refer to 38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS , Component locations.

For all Automatic Transmission- Gears, Hydraulic controls removal/installation procedures and torque specifications. Refer to 38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS , Removal and Installation procedures.

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 Adapter VAG1598/20 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

Note. Thoroughly clean fuel system line and hose connections and the surrounding area before disconnecting. Place removed components on a clean surface and cover. Use plastic sheeting or paper. Do not use fluffy rags that could leave lint! Carefully cover over or seal any components that have been opened if repairs are not carried out immediately. Install only clean parts: Do not remove replacement parts from the packaging until immediately before they are to be installed. Do not use parts that have been stored without packaging (e.g. in toolboxes, etc.). When the fuel system is opened: Avoid working with compressed air whenever possible. Avoid moving the vehicle if possible. Make sure that no Diesel fuel runs onto coolant hoses. Affected hoses must be cleaned immediately. Contaminated hoses must be replaced.

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.

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 V.
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.

Scheme 823

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

1. Disconnect the electrical connector in the - direction of the arrow - and remove it from the Transmission Control Module (TCM) J217.
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. Refer to «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Note. The Transmission Control Module (TCM) J217 is a component of the Mechatronic unit and cannot be replaced separately.

1. Assembly is performed in the reverse of the removal.

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. Generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .
4. End diagnosis

Transmission RPM Sensor, Checking

Note. The Transmission Input Speed (RPM) Sensor G182 is a component of the Mechatronic unit in the transmission.

Requirements

1. The battery voltage must be at least 12.5 V.
2. All electrical consumers must be switched off.
3. The parking brake must be engaged.
4. The selector lever must be in the "P" position.

1. The Ground (GND) connections to transmission must be OK.

Test sequence

1. Disconnect the electrical connector in the - direction of the arrow - and remove it from the Transmission Control Module (TCM) J217.
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. Refer to «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Note. The Transmission Input Speed (RPM) Sensor G182 is a component of the Mechatronic unit and cannot be replaced separately.

1. Assembly is performed in the reverse of the removal.

1. Check the DTC memory.
2. If necessary, erase DTC memory of the Transmission Control Module (TCM) J217. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. Generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Transmission Output RPM Sensor, Checking

Note. The Transmission Output Speed (RPM) Sensor G195 is a component of the Mechatronic unit in the transmission.

Requirements

1. The battery voltage must be at least 12.5 V.
2. All electrical consumers must be switched off.
3. The parking brake must be engaged.
4. The selector lever must be in the "P" position.

1. The Ground (GND) connections to transmission must be OK.

Test sequence

1. Disconnect the electrical connector in the - direction of the arrow - and remove it from the Transmission Control Module (TCM) J217.
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. Refer to «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Note. The Transmission Output Speed (RPM) Sensor G195 is a component of the Mechatronic unit and cannot be replaced separately.

1. Assembly is performed in the reverse of the removal.

1. Check the DTC memory.
2. If necessary, erase DTC memory of the Transmission Control Module (TCM) J217. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. Generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Transmission Fluid Temperature Sensor, Checking

Note. The Transmission Fluid Temperature Sensor G93 is a component of the Mechatronic unit in the transmission.

Requirements

1. The battery voltage must be at least 12.5 V.
2. All electrical consumers must be switched off.
3. The parking brake must be engaged.
4. The selector lever must be in the "P" position.

1. The Ground (GND) connections to transmission must be OK.

Test sequence

1. Disconnect the electrical connector in the - direction of the arrow - and remove it from the Transmission Control Module (TCM) J217.
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. Refer to «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Note. The Transmission Fluid Temperature Sensor G93 is a component of the Mechatronic unit and cannot be replaced separately.

1. Assembly is performed in the reverse of the removal.

1. Check the DTC memory.
2. If necessary, erase DTC memory of the Transmission Control Module (TCM) J217. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. Generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Solenoid Valve 1, Checking

Note. The Solenoid Valve 1 N88 is a component of the Mechatronic unit in the transmission.

Requirements

1. The battery voltage must be at least 12.5 V.
2. All electrical consumers must be switched off.
3. The parking brake must be engaged.
4. The selector lever must be in the "P" position.

1. The Ground (GND) connections to transmission must be OK.

Test sequence

1. Disconnect the electrical connector in the - direction of the arrow - and remove it from the Transmission Control Module (TCM) J217.
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. Refer to «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Note. The Solenoid Valve 1 N88 is a component of the Mechatronic unit and cannot be replaced separately.

1. Assembly is performed in the reverse of the removal.

1. Check the DTC memory.
2. If necessary, erase DTC memory of the Transmission Control Module (TCM) J217. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. Generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Transmission Control Module

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 replaced separately.

Special tools, testers and auxiliary items required

1. Multimeter
2. Wiring diagrams.

Requirements

1. Fuses S132, SB31, and SA20 OK.
2. The battery voltage must be at least 12.5 V.
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 --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check)

Start diagnosis

1. Release the electrical connector in the - direction of the arrow - and remove it from the Transmission Control Module (TCM) J217.

Observe safety precautions.

1. Check the electrical harness connector for damage, corrosion, loose or broken terminals.
2. Repair any damage found to the electrical harness connector.

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 Transmission Control Module (TCM) J217 electrical harness connector T16c terminal 11 to Ground (GND) for voltage.

Specified value: battery voltage.

1. Using a Multimeter , check the Transmission Control Module (TCM) J217 electrical harness connector T16c terminal 14 to Ground (GND) for voltage.

Specified value: battery voltage.

1. Using a Multimeter , check the Transmission Control Module (TCM) J217 electrical harness connector T16c terminal 16 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 Transmission Control Module (TCM) J217 electrical harness connector T16c terminals 11,14 and 16 for an open circuit or a short circuit.
2. If necessary, repair the faulty wiring.

If the specified value was obtained

Checking Ground (GND)

1. Using a Multimeter , check the Transmission Control Module (TCM) J217 electrical harness connector T16c terminal 13 to Ground (GND) for resistance.

Specified value: 1.5 ohms max.

1. Using a Multimeter , check the Transmission Control Module (TCM) J217 electrical harness connector T16c terminal 16 to Ground (GND) for resistance.

Specified value: 1.5 ohms max.

If the specification was not obtained

1. Check the wiring for a an open circuit.
2. If necessary, repair the faulty wiring.

If no malfunction is found in the wiring

1. Replace the Mechatronic unit in the transmission. Refer to «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(ref-281381-S08686013262008031100000) .

Note. The Transmission Control Module (TCM) J217 is a component of the Mechatronic unit and cannot be replaced separately.

1. Assembly is performed in the reverse of the removal.

Final procedures

1. Check the DTC memory.
2. If necessary, erase DTC memory of the Transmission Control Module (TCM) J217. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. Generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

End diagnosis

Transmission Control Module, Replacing

Note. The Transmission Control Module (TCM) J217 is a component of the mechatronic unit in the transmission and cannot be replaced separately.

Note. 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.

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, e.g.: 09G27750 L 0301
2. End diagnosis and switch the ignition off.
3. Replace the mechatronic unit in the transmission. Refer to «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.

Final procedures

1. Check the DTC memory.
2. If necessary, erase DTC memory of the Transmission Control Module (TCM) J217. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. Generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

End diagnosis

Continuously Variable Transmission, Checking

The following table provides quick links.

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 Adapter VAG1598/21 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

Note. Thoroughly clean fuel system line and hose connections and the surrounding area before disconnecting. Place removed components on a clean surface and cover. Use plastic sheeting or paper. Do not use fluffy rags that could leave lint! Carefully cover over or seal any components that have been opened if repairs are not carried out immediately. Install only clean parts: Do not remove replacement parts from the packaging until immediately before they are to be installed. Do not use parts that have been stored without packaging (e.g. in toolboxes, etc.). When the fuel system is opened: Avoid working with compressed air whenever possible. Avoid moving the vehicle if possible. Make sure that no Diesel fuel runs onto coolant hoses. Affected hoses must be cleaned immediately. Contaminated hoses must be replaced.

Tiptronic Switch, Checking

Note. The Selector Lever Sensor System Control Module J587 and the Tiptronic Switch F189 are combined into one component.

Special tools, testers and auxiliary items required

1. Multimeter
2. Wiring diagram

Requirements

1. Fuses SB15 and SA20 OK.
2. Selector Lever Sensor System Control Module J587 must be OK.
3. The Control Module with indicator unit in the Instrument Cluster Control Module J285 must be OK.
4. The selector lever cable adjustment OK.

1. The battery voltage must be at least 12.5 V.
2. All electrical consumers must be switched off.
3. The parking brake must be engaged.
4. The selector lever must be in the "P" position.

1. The Ground (GND) connections to transmission must be OK.

Procedure

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 with the Tiptronic Switch F189 indicator display unit.

1. Switch the ignition off.

Scheme 824

If the selector lever position does not correspond with the Tiptronic Switch F189 indicator display unit

1. Disconnect the Tiptronic Switch F189 electrical harness connector - 2 -.
2. Check the electrical harness connector for damage, corrosion, loose or broken terminals.
3. Repair any damage found to the electrical harness connector.

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 Tiptronic Switch F189 electrical harness connector terminal T10p/7 to Ground (GND) for voltage.

Specified value, Battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

1. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking Ground (GND)

1. Using a multimeter , check the Tiptronic Switch F189 electrical harness connector terminal 10p/6 to Ground (GND) connection 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. If necessary, repair the faulty wiring connection.

If no malfunction was found in the wiring and the resistance was OK

Checking wiring

Scheme 825

1. Remove the Transmission Control Module (TCM) J217. Refer to --> «Transmission Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh) .
2. Using a multimeter , check the Tiptronic Switch F189 electrical harness connector terminals to the Transmission Control Module (TCM) J217 electrical harness connector 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. If necessary, repair the faulty wiring connection.

If no malfunction was found in the wiring and the resistance was OK

1. Replace the Transmission Control Module (TCM) J217. Refer to --> «Transmission Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh) .
2. Assembly is performed in the reverse of the removal.

1. Check the DTC memory.
2. If necessary, erase DTC memory of the Transmission Control Module (TCM) J217. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. Generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Shift Lock Solenoid, Checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse S13 OK.
2. Brake Light Switch F OK.
3. The ignition switched off.

Test procedure

Scheme 826

1. Perform a preliminary check to verify the customers complaint. Refer to --> «Preliminary Check»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__preliminary-check) .

Scheme 827

1. Disconnect the Shift Lock Solenoid N110 electrical harness connector - 1 - by releasing the catches - arrow A - and pulling away from the solenoid - arrow B

Checking internal resistance

1. Using a Multimeter , check the Shift Lock Solenoid N110 terminals 1 and 2 - B - for resistance.

Specified value: 21.3 to 23.3 ohms.

If the specified value is not obtained

1. Replace the Shift Lock Solenoid N110. Refer to --> «37 AUTOMATIC TRANSMISSION - CONTROLS, HOUSING»(/audi/a6/6-2004-2008/remont/differentials-drive-axles/#continuously-variable-transmission-cvt-01j) .

If the specification is obtained

Checking voltage supply

1. Using a Multimeter , check the Shift Lock Solenoid N110 terminal T2l/1 to Ground (GND) for voltage.

1. Switch the ignition on.
2. Depress the brake pedal.

Specified value: battery voltage.

1. Release the brake pedal.

Specified value: 0V.

1. Switch the ignition off.

If the specified value was not obtained

1. Check the wiring connection from the Transmission Control Module (TCM) J217 electrical connector T20e/5 terminal to the Shift Lock Solenoid N110 electrical harness connector terminal T2l/1 to for an open circuit or a short to Battery positive (+).

If the specified value was not obtained

1. Check the electrical harness connector for damage, corrosion, loose or broken terminals.
2. If necessary, repair the wiring connection.

If the specified value was obtained

Check Ground (GND) activation

1. Using a Multimeter , check the Shift Lock Solenoid N110 electrical harness connector terminal T2l/2 to Battery (+) for voltage.

1. Switch the ignition on.

Specified value: battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

1. Check the wiring connection from the Shift Lock Solenoid N110 electrical harness connector terminal T2l/2 to ground connection 8 (in the main wiring harness) for an open circuit or a short to Battery positive (+).
2. Check the electrical harness connector for damage, corrosion, loose 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 VAG1598/31. Refer to «24 - FUEL INJECTION SYSTEM»(/audi/a6/6-2004-2008/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 Transmission Control Module (TCM) J217. Refer to --> «Transmission Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh) .
2. Using a Multimeter , check the Shift Lock Solenoid N110 terminal T2am1 to the Brake Light Switch F electrical connector terminal 4
3. Using a Multimeter , check the Shift Lock Solenoid electrical connector terminals T2am2 to Transmission Control Module (TCM) J217 electrical connector terminal 7 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, to Battery positive (+), Ground (GND) or an open circuit.
2. Check the electrical harness connector for damage, corrosion, loose or broken terminals.
3. If necessary, repair the wiring connection.
4. Erase the DTC memory. Refer to --> «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .

1. 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 the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK

1. Replace the Transmission Control Module (TCM) J217. Refer to --> «Transmission Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh) .
2. Assembly is performed in the reverse of the removal.

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/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

Transmission Control Module Function

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 valve body, which control the slide valves in the valve body.

Scheme 828

The Transmission Control Module (TCM) J217 is mounted at the rear of the transmission, directly on the hydraulic unit. The following components are integrated in the control module. - A - Transmission Output Speed (RPM) Sensor G195 and Transmission Output Speed (RPM) Sensor 2 G196 , - B - Transmission Fluid Temperature Sensor G93 , - C - Multi-Function Transmission Range (TR) Switch F125 , - D - Transmission Input Speed (RPM) Sensor G182 , - E - Automatic Transmission Hydraulic Pressure Sensor 1 G193 and - F - Automatic Transmission Hydraulic Pressure Sensor 2 G194. These components are not serviced separately.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Requirements

1. Fuses SB31 SA20 OK.
2. The battery voltage must be at least 12.5 V.
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.

Procedure

1. Disengage the cover from vehicle floor and heat shield above exhaust system in rear area of transmission, then move the heat shield aside slightly.

1. Disconnect the Transmission Control Module (TCM) J217 harness connector by moving it in the direction of the - arrow - and it from disconnecting it from the transmission.

Note. Adaptation values in Transmission Control Module (TCM) are reset when the harness connector is disconnected.

1. Check the electrical harness connector for damage, corrosion, loose or broken terminals.
2. Repair any damage found to the electrical harness connector.

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 Transmission Control Module (TCM) J217 electrical harness connector terminal T20d/9 and terminal T20d/10 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 Transmission Control Module (TCM) J217 electrical harness connector terminals T20d/9 and T20d/10 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 terminal T20d/8 to Ground (GND) for resistance.

Specified value: 1.5 ohms max.

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 Transmission Control Module (TCM) J217. Refer to --> «Transmission Control Module, Replacing»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh) .
2. Assembly is performed in the reverse of the removal.

Final procedures

1. Check the DTC memory.
2. If necessary, erase DTC memory of the Transmission Control Module (TCM) J217. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. Generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

End diagnosis.

Note. 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.

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, e.g.: 09G27750 L 0301
2. End diagnosis and switch the ignition off.

Removal

Scheme 829

1. Remove the transmission end cover and mounting bolts. Refer to --> «38 AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(/audi/a6/6-2004-2008/remont/differentials-drive-axles/#continuously-variable-transmission-cvt-01j)

Remove the mounting bolts - arrows - and pull out the Transmission Control Module (TCM) J217 without tilting it.

Remove twin lip oil seal - A - from the Transmission Control Module (TCM) J217.

Installation

1. Assembly is performed in the reverse of the removal. Note the following

Note. When positioning the Transmission Control Module (TCM) J217 ensure sensor on control module is not damaged.

Note. Replace gaskets and O-rings.

Note. If necessary, clean sensors - A,B,C - of dirt and metal shavings.

Scheme 830

Note. Clean selector shaft. Refer to --> 38 AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS

Scheme 831

Note. Before installing Transmission Control Module (TCM) J217 , coat new O-rings - A - on hydraulic control module with ATF.

Note. Install the Transmission Control Module (TCM) J217 without tilting it. Harness connectors - A,B,C - on rear side of control module must engage on hydraulic control module.

1. Check the identification of the new Transmission Control Module (TCM) J217 to ensure it matches the old Transmission Control Module (TCM) J217.
2. Code the Transmission Control Module (TCM) J217.

Final procedures

1. Check the DTC memory.
2. If necessary, erase DTC memory of the Transmission Control Module (TCM) J217. Refer to «Diagnostic Mode 04 - Reset/Delete Diagnostic Data»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-04-resetdelete-diagnostic) .
3. Generate readiness code. Refer to «Readiness Code»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__readiness-code) .

End diagnosis

On Board Diagnostic

The following table provides quick links.

Generic Scan Tool Manual Contents

GST is an acronym for Generic Scan Tool Manual.

Included in the contents of this GST manual 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 manual to the applicable OBD System Strategy document.

This GST manual 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

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, 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).

The following table provides quick links.

Diagnostic Mode 01 - Obtain Data

Diagnostic Mode 01 is used to display and monitor all emissions related measured values.

Depending on scan tool and protocol used, the information displayed in diagnostic mode 01 may be referred to by different names such as Test-ID (TID), Hex-ID, Component-ID (CID), On-Board Diagnostic Monitor Identifier (OBDMID), or contain no name at all and be referenced by only a number.

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".

The current values of the component or system that is being monitored will be displayed on the scan tool screen.

1. Switch the ignition off.

Diagnostic Mode 02 - Obtain Operating Conditions

Diagnostic Mode 02 is used to monitor the operating conditions under which the Engine Control Module (ECM) has detected and stored an emissions related DTC.

Note. Depending on scan tool and protocol used, the information in diagnostic mode 02 may be referred to by different names such as Test-ID (TID), Hex-ID, Component-ID (CID), or On-Board Diagnostic Monitor Identifier (OBDMID).

Procedure

1. Connect the scan tool.
2. Start the engine and run at idle.
3. Select "Diagnostic Mode 2: Obtain operating conditions.".
4. From the following table, select the desired the "PID" , e.g. "PID 05-Coolant temperature" that is to be monitored.

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.

1. Switch the ignition off.

Diagnostic Mode 03 - Interrogating Fault Memory

Description

When the Engine Control Module (ECM) recognizes an emission related fault it turns on the Malfunction Indicator Lamp (MIL) or if a Electronic Throttle Malfunction is recognized, the Engine Control Module (ECM) turns on the Electronic Power Control (EPC) Warning Lamp which are both located in the instrument cluster.

Diagnostic Mode 03 is used to retrieve and view any DTC which may be stored in the Engine Control Module (ECM).

The DTCs are sorted by SAE code with the DTC tables consisting of a 5-digit alpha-numeric value.

Note. Depending on scan tool and protocol used, diagnostic mode 03 and the information provided may be referred to by a different name.

The following tables provide a breakdown and explanation of the DTC code.

P-Codes

U-Codes

Procedure

1. Connect the scan tool.
2. Switch the ignition to the "ON" position.
3. Select "Diagnostic Mode 03: Interrogating fault memory ".
4. The stored DTC or DTCs will be displayed on the scan tool screen.

The following table is an example of the DTC information that may be displayed on the scan tool screen

> SAE P0xxx Diagnostic Trouble Codes

> SAE P2xxx Diagnostic Trouble Codes

> SAE P3xxx Diagnostic Trouble Codes

> SAE U0xxx- Diagnostic Trouble Codes

1. Switch the ignition off.

Diagnostic Mode 04 - Reset/Delete Diagnostic Data

Diagnostic Mode 04 is used to reset or delete the following stored information

1. All emission related malfunctions in the DTC memory.
2. The operating conditions at which a malfunction was stored will be reset.
3. All adaptation values.
4. The test results of all diagnostic functions.

Note. Depending on scan tool and protocol used, diagnostic mode 04 and the information provided may be referred to by a different name.

Procedure

1. Connect the scan tool.
2. Switch the ignition to the "ON" position.
3. Select "Diagnostic Mode 03: Interrogating fault memory ".
4. Then select "Mode 4: Reset/delete diagnostic data".

The scan tool will display: "Diagnostic data are being erased".

1. Switch the ignition off.

Diagnostic Mode 05 - Check Lambda Test Results

Note. The diagnostic information for "Diagnostic Mode 5: check lambda test results" is not supported in this section of the 2005 and later Audi A6 3.2L Generic Scan Tool (GST) service manual and has been moved to "Diagnostic Mode 6: Checking test results of components that are not continuously monitored" section. --> Diagnostic Mode 06 - Checking Test Results of Components Not Continuously Monitored

Diagnostic Mode 06 - Checking Test Results of Components Not Continuously Monitored

Mode 06 makes it possible to query test results for special components and systems that are being continuously or not continuously monitored. When the system diagnosis is complete, the results and the associated parameter values are stored in memory and displayed in Mode 06. This data is stored in memory (even when the ignition is off) until either a new diagnostic results are present or if the fault memory is cleared. System Initialization Values (after fault memory has been cleared): Test Results = 0, Test Parameter Values = 0.

Note. Depending on the scan tool and protocol used, the information displayed in Diagnostic Mode 06 may be referred to by different names such as Test-ID (TID), Hex-ID, Component-ID (CID), On-Board Diagnostic Monitor Identifier (OBDMID), or contain no name at all and may be referenced by only a number. The min max values for each individual test in Mode 06 represent the min max operating values for a properly operating system. This data is provided to the individual aftermarket scan tool companies for development of their scan tool. Depending on the scan tool being used, the min max values shown may vary, or be rounded up or down to the nearest decimal point depending on the aftermarket scan tool companies development process.

Test requirements

1. Exhaust system must be properly sealed between catalytic converter and cylinder head.
2. No DTCs in the DTC memory.
3. Coolant temperature at least 80 C.

Work procedure

1. Connect the scan tool.
2. Start the engine and let run at idle speed.
3. Select "Diagnostic Mode 06 - Checking test results of components that are not continuously monitored".

Select the desired "Test-ID"..

The current minimum and maximum values will be displayed on the scan tool screen.

Test-ID 01 ($01): O2 Sensor in front of Catalytic Converter, (Bank 1- Sensor 1)

1. Connect the scan tool.
2. Start the engine and let run at idle speed.
3. Select "Diagnostic Mode 06 - Checking test results of components that are not continuously monitored".

Select "Test-ID 01 ($01)".

1. Select the desired "Test-ID".
2. Check specified values at idle.

1. If any component or system fails to meet the specified values, refer to --> «Diagnostic Mode 03 - Interrogating Fault Memory»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-03-interrogating-fault) to check for stored DTCs or the corresponding diagnostic repair procedure.
2. Switch the ignition off.

Test-ID 05 ($05): O2 Sensor in front of Catalytic Converter, (Bank 2- Sensor 1)

1. Connect the scan tool.
2. Start the engine and let run at idle speed.
3. Select "Diagnostic Mode 06 - Checking test results of components that are not continuously monitored".
4. Select the desired "Test-ID".

Select "Test-ID 05 ($05)".

1. Check specified values at idle.

1. If any component or system fails to meet the specified values, refer to --> «Diagnostic Mode 03 - Interrogating Fault Memory»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-03-interrogating-fault) to check for stored DTCs or the corresponding diagnostic repair procedure.
2. Switch the ignition off.

Test-ID 02 ($02): Oxygen Sensor (Bank 1, Sensor 2)

1. Connect the scan tool.
2. Start the engine and let run at idle speed.
3. Select "Diagnostic Mode 06 - Checking test results of components that are not continuously monitored".

Select "Test-ID 02 ($02)".

1. Select the desired "Test-ID".
2. Check specified values at idle.

1. If any component or system fails to meet the specified values, refer to --> «Diagnostic Mode 03 - Interrogating Fault Memory»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-03-interrogating-fault) to check for stored DTCs or the corresponding diagnostic repair procedure.
2. Switch the ignition off.

Test-ID 06 ($06): Oxygen Sensor (Bank 2, Sensor 2)

1. Connect the scan tool.
2. Start the engine and let run at idle speed.
3. Select "Diagnostic Mode 06 - Checking test results of components that are not continuously monitored".

Select "Test-ID 06 ($06)".

1. Select the desired "Test-ID".
2. Check specified values at idle.

1. If any component or system fails to meet the specified values, refer to --> «Diagnostic Mode 03 - Interrogating Fault Memory»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-03-interrogating-fault) to check for stored DTCs or the corresponding diagnostic repair procedure.
2. Switch the ignition off.

Test-ID 33 ($21): Catalytic Converter Monitoring Bank 1

1. Connect the scan tool.
2. Start the engine and let run at idle speed.
3. Select "Diagnostic Mode 06 - Checking test results of components that are not continuously monitored".

Select "Test-ID 33 ($21)".

1. Select the desired "Test-ID".
2. Check specified values at idle.

1. If any component or system fails to meet the specified values, refer to --> «Diagnostic Mode 03 - Interrogating Fault Memory»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-03-interrogating-fault) to check for stored DTCs or the corresponding diagnostic repair procedure.
2. Switch the ignition off.

Test-ID 34 ($22): Catalytic Converter Monitoring Bank 2

1. Connect the scan tool.
2. Start the engine and let run at idle speed.

Check Test Results of Components

1. Select "Diagnostic Mode 06 - Checking test results of components that are not continuously monitored".

Select "Test-ID 34 ($22): Catalytic Converter Monitoring Bank 2".

1. Select the desired "Test-ID".
2. Check specified values at idle.

1. If any component or system fails to meet the specified values, refer to --> «Diagnostic Mode 03 - Interrogating Fault Memory»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-03-interrogating-fault) to check for stored DTCs or the corresponding diagnostic repair procedure.
2. Switch the ignition off.

Test-ID 58 ($3A)): Fuel Tank EVAP System Leak Test (0.090)

1. Connect the scan tool.
2. Start the engine and let run at idle speed.
3. Select "Diagnostic Mode 06 - Checking test results of components that are not continuously monitored".

Select "Test-ID 03 ($03)".

1. Select the desired "Test-ID".
2. Check specified values at idle.

1. If any component or system fails to meet the specified values, refer to --> «Diagnostic Mode 03 - Interrogating Fault Memory»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-03-interrogating-fault) to check for stored DTCs or the corresponding diagnostic repair procedure.
2. Switch the ignition off.

Test-ID 59 ($3B)): Fuel Tank EVAP System Leak Test (0.040)

1. Connect the scan tool.
2. Start the engine and let run at idle speed.
3. Select "Diagnostic Mode 06 - Checking test results of components that are not continuously monitored".

Select "Test-ID 59 ($3B)".

1. Select the desired "Test-ID".
2. Check specified values at idle.

1. If any component or system fails to meet the specified values, refer to --> «Diagnostic Mode 03 - Interrogating Fault Memory»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-03-interrogating-fault) to check for stored DTCs or the corresponding diagnostic repair procedure.
2. Switch the ignition off.

Test-ID 60 ($3C) : Fuel Tank EVAP System Leak Test (0.020/0.5mm)

1. Connect the scan tool.
2. Start the engine and let run at idle speed.
3. Select "Diagnostic Mode 06 - Checking test results of components that are not continuously monitored".

Select "Test-ID 60 ($3C)".

1. Select the desired "Test-ID".
2. Check specified values at idle.

1. If any component or system fails to meet the specified values, refer to --> «Diagnostic Mode 03 - Interrogating Fault Memory»(/audi/a6/6-2004-2008/remont/cooling-fan/#32l-v6-4v-generic-scan-tool-engine-codes-bkh__diagnostic-mode-03-interrogating-fault) to check for stored DTCs or the corresponding diagnostic repair procedure.
2. Switch the ignition off.

Test-ID 61 ($3D): Tank Vent Valve - Function Check