1.8l 4-cyl 5v Turbo Engine Controls - Generic Scan Tool, Engine Code(s): Amb Audi A4 B6

Fuel Supply System

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

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

Safety precautions

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

1. Disconnect the battery Ground (GND) cable with the ignition switched off --> «27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL»(/audi/a4/b6-2000-2006/remont/cruise-control-systems/#electrical-equipment) «27 BATTERY, STARTER, GENERATOR, CRUISE CONTROL»(ref-278931-S05223151852008020700000) for ELECTRICAL EQUIPMENT, CABRIOLET .
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!

Rules for cleanliness

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

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

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

Fuel pump electrical, testing

Special tools, testers and auxiliary items required

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

Scheme 500

Test conditions

1. Battery voltage 12.5 V.
2. Fuse - 29 - in fuse holder at left of instrument panel is OK.
3. Fuel filter OK.
4. Ignition switched off.

Test sequence

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

Scheme 501

1. Remove cover retainers - arrows - from the right sealing flange.

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

Scheme 502

1. Connect a jumper cable from a Electrical connector test lead set to terminal - 5 - of the fuel delivery unit and to vehicle Ground (GND).
2. Press switch on the Hand held remote control (jumper).

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

1. Listen for an operating noise from the fuel pump.

If no operating noise is heard

1. Remove the fuel delivery unit. Refer to --> «20 - FUEL SUPPLY SYSTEM»(/audi/a4/b6-2000-2006/remont/fuel-system/#fuel-supply-system) .

Scheme 503

1. Using a Multimeter , check the electrical circuit between terminals - 1 - and - 5 - of the fuel delivery unit for continuity.

Specified value: 0 ohms.

If a malfunction is detected in the electrical circuit

1. Check the wiring for a short circuit to Battery positive (+) or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the electrical circuit.
4. If no malfunction is detected in electrical circuit, replace the fuel pump. Refer to --> «20 - FUEL SUPPLY SYSTEM»(/audi/a4/b6-2000-2006/remont/fuel-system/#fuel-supply-system) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Fuel Pump (FP) delivery quantity, checking

Special tools, testers and auxiliary items required

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

1. 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. Ignition switched off.

Test sequence

1. Remove the fuel filler cap from fuel filler tube.
2. Remove rear seat bench --> «72 - SEAT - FRAMES»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior) «72 - SEAT - FRAMES»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior-cabriolet) for BODY INTERIOR - CABRIOLET .

1. Remove cover retainers - arrows - from the right sealing flange.

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

1. Connect a jumper cable from a Electrical connector test lead set to terminal - 5 - of the fuel delivery unit and to vehicle Ground (GND).

Scheme 504

1. Disconnect the fuel return line - arrow - by pressing release buttons.

Scheme 505

1. Connect a fuel line from the Fuel pressure test set (high pressure) to the disconnected fuel return line and hold it in the measuring container.
2. Press the switch on the Hand held remote control (jumper) and operate the fuel pump for 15 seconds.

Scheme 506

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

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

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

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

1. If necessary, repair any pinched or plugged lines.
2. Replace the fuel filter. Refer to --> «20 - FUEL SUPPLY SYSTEM»(/audi/a4/b6-2000-2006/remont/fuel-system/#fuel-supply-system) .
3. Replace the fuel pump. Refer to --> «20 - FUEL SUPPLY SYSTEM»(/audi/a4/b6-2000-2006/remont/fuel-system/#fuel-supply-system) .

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

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

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Evaporative Emissions (EVAP) System

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

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

For all EVAP system removal/installation procedures and torque specifications. Refer to --> 20 - FUEL SUPPLY 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 VAG1598/31 is available for purchase or rental.

EVAP system, leak detection

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 via the engine intake stroke.

1. When leak detection is activated, the diaphragm pump pumps the fuel system up to 20 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 seconds. 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 seconds of leak detection time, a further test is performed: In this case the diaphragm pump pumps four times again. The Motronic Engine Control Module (ECM) J220 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.

Evaporative Emission (EVAP) canister system, checking for proper seal

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

Test sequence

1. Connect the scan tool.
2. Start the engine and let run at idle for at least 15 minutes.
3. Select "Diagnostic mode 8: Tank leak test".
4. Select the "OBDMID 01: Tank leak test" and check the specified value at idle.

Specified value: test OK

Note. If the accelerator pedal is depressed during the test, the test will be aborted. To repeat the tank leak-tightness test, switch the ignition off, start the engine again, and let it run at idle.

If the specified value is obtained

1. End diagnosis and switch the ignition off.

If the specified value is not obtained

Checking fuel supply and tank ventilation systems for leaks

1. Ensure the fuel filler cap is properly installed on the fuel tank.
2. Check the fuel filler cap seal for damage. Replace if necessary.
3. Remove the rear seat bench --> «72 - SEAT - FRAMES»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior) «72 - SEAT - FRAMES»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior-cabriolet) for BODY INTERIOR - CABRIOLET .

Scheme 507

1. Release the retaining tabs - arrows -.
2. Release the retaining tabs - 1 - and - 3 -.

Scheme 508

1. Lift the cover - 2 - toward the front - arrow -.

Scheme 509

1. Unbolt the cover - arrows -.

Scheme 510

1. Remove the bolts - arrows - and cover.
2. Check the seals under the locking flanges are OK and the union nuts are properly tightened on the fuel tank. Also check the fuel line connections.
3. Visually check all hose connections of the fuel supply system and replace any leaking lines, e.g

1. Check the line from the EVAP canister to the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.
2. Check the lines from the EVAP canister to the Leak Detection Pump (LDP) V144.
3. Check the line from the fuel tank to the EVAP canister (below cover for EVAP canister).
4. Check the lines for the tank ventilation (beneath right rear wheel housing liner).

1. Check the fuel lines to the engine.

Note. Leaks at the lines and components of the fuel tank ventilation system can sometimes be located using a non-flammable, environmentally compliant leak detection spray. Initiate the leak diagnosis several times in sequence to build up pressure in the system. At leaking areas, bubbles will form.

1. Repeat the function test.

If a leak is detected

1. Perform a visual inspection on the fuel system components and tank ventilation system.

1. Fuel tank.
2. EVAP canister.
3. Leak Detection Pump (LDP) V144.
4. Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.

Note. Due to the form or function of the components, leaking areas may not always be localized by spraying on the leak detection spray. It may be necessary to clamp off the relevant component using Hose Clamps Up To 25mm Dia. and initiate the tank leak detection diagnostic. If the leak is no longer indicated, the component that was clamped off is faulty. If clamped off directly at the leak detection pump and a leak is still indicated, the leak detection pump itself is leaking.

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 , checking (AMB Engine Code)

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 fuse OK.
2. The ignition switched off.

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

Procedure

Scheme 511

1. Remove the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

Scheme 512

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

Checking internal resistance

Scheme 513

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

Specified value: 22.0 to 30.0 ohms.

If the specified value is not obtained

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

If the specification is obtained

Checking voltage supply

Scheme 514

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 for voltage.

1. Operate the starter briefly.

Specified value: battery voltage.

If the specified value is not obtained

1. Check the wiring connection from terminal 2 of Fuel Pump Relay J17 to pin 1 of N80 connector for an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the wiring connection.

If the specified value was obtained

Check Ground (GND) activation

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

1. Operate the starter briefly.

Specified value: battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

1. Using a Multimeter , check the Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 electrical connector terminal 2 to Motronic Engine Control Module (ECM) J220 electrical connector terminal 64 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. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the wiring connection.

If the specification was obtained

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Install the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Leak Detection Pump (LDP) V144 , checking (AMB Engine Code)

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

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

Procedure

1. Remove the left rear wheel housing liner. --> «66 EXTERIOR EQUIPMENT»(/audi/a4/b6-2000-2006/remont/door-locks-anti-theft-systems/#body-exterior) «66 - EXTERIOR EQUIPMENT»(/audi/a4/b6-2000-2006/remont/door-locks-anti-theft-systems/#body-exterior-cabriolet) for BODY EXTERIOR - CABRIOLET .

Scheme 515

1. Disconnect the Leak Detection Pump (LDP) V144 electrical harness connector - 2 -.

Checking internal resistance

Scheme 516

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

If any of the specifications are not obtained

1. Replace the Leak Detection Pump (LDP) -V144-. --> «20 - FUEL SUPPLY SYSTEM»(/audi/a4/b6-2000-2006/remont/fuel-system/#fuel-supply-system) .

If the specified values are obtained

Checking voltage supply

Note. The voltage for the Leak Detection Pump (LDP) -V144- is supplied via the Engine Control Module (ECM) J220.

1. Check the Leak Detection Pump (LDP) -V144- for voltage.

Scheme 517

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.

If the specified value was not obtained

1. Using a Multimeter , check the Leak Detection Pump (LDP) -V144- electrical harness connector terminal 3 to the Fuel Pump Relay J17 terminal 2 for an open circuit.

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. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

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

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Using a Multimeter , check the Leak Detection Pump (LDP) -V144- electrical connector terminal 1 to Motronic Engine Control Module (ECM) J220 electrical connector terminal 80 for an open circuit.

1. Using a Multimeter , check the Leak Detection Pump (LDP) -V144- electrical connector terminal 2 to Motronic Engine Control Module (ECM) J220 electrical connector terminal 25 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. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in wiring

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

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

1. Install the left rear wheel housing liner --> «66 EXTERIOR EQUIPMENT»(/audi/a4/b6-2000-2006/remont/door-locks-anti-theft-systems/#body-exterior) «66 - EXTERIOR EQUIPMENT»(/audi/a4/b6-2000-2006/remont/door-locks-anti-theft-systems/#body-exterior-cabriolet) for BODY EXTERIOR - CABRIOLET .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Function of "EPC" system

For "EPC" , the throttle valve is not operated by a cable from the accelerator pedal. There is no mechanical connection between the accelerator pedal and the throttle valve.

The position of the accelerator pedal is communicated to Motronic Engine Control Module (ECM) J220 via Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 (variable resistances; stored in one housing) that are connected with the accelerator pedal.

The accelerator pedal position (drivers intention) is a main input unit for the Motronic Engine Control Module (ECM) J220.

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

Throttle valve is operated by Throttle Drive (for Electronic Power Control (EPC)) G186 according to specifications of Motronic Engine Control Module (ECM) J220.

With engine off and ignition switched on, Motronic Engine Control Module (ECM) J220 controls the Throttle Drive (for Electronic Power Control (EPC)) G186 exactly according to specifications of Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185. This means, if the accelerator pedal is depressed half way, the Throttle Drive (for Electronic Power Control (EPC)) G186 opens the throttle valve to the same degree; i.e. throttle valve is then opened approx. half way.

With engine running (under load), Motronic Engine Control Module (ECM) J220 can open or close the throttle valve independently of Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185.

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

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

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

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

Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 , checking (Engine Code AMB)

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram

Test requirement

1. The Motronic Engine Control Module (ECM) J220 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

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

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

Test sequence

1. Remove the drivers side storage compartment. Refer to --> «68 - INTERIOR EQUIPMENT»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior) «68 - INTERIOR EQUIPMENT»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior-cabriolet) for BODY INTERIOR - CABRIOLET .

Scheme 518

1. Disconnect the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 6-pin electrical harness connector - 2 -.

Checking voltage supply and wiring

1. Switch the ignition on.

Scheme 519

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

1. Switch the ignition off.

If the specification was not obtained

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

Scheme 520

1. Using a Multimeter , check the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J220 electrical connector for an open circuit.

Specified value: 1.5 ohms max.

If the specification is not obtained

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

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

1. Replace the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185. --> «20 - FUEL SUPPLY SYSTEM»(/audi/a4/b6-2000-2006/remont/fuel-system/#fuel-supply-system) .

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Install the drivers side storage compartment. Refer to --> «68 - INTERIOR EQUIPMENT»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior) «68 - INTERIOR EQUIPMENT»(/audi/a4/b6-2000-2006/remont/gauges-instrument-panels/#body-interior-cabriolet) for BODY INTERIOR - CABRIOLET .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Turbocharger

For all Turbocharger, G-Charger component locations. Refer to --> 21 - TURBOCHARGER, G-CHARGER

For all Turbocharger, G-Charger removal/installation procedures and torque specifications. Refer to --> 21 - TURBOCHARGER, G-CHARGER

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 VAG1598/31 is available for purchase or rental.

General notes

1. Charge air system must be properly sealed.
2. Always replace self-locking nuts.
3. Charge air hoses and pipes as well as their connections must be free of oil and grease before re-installing.
4. Do not assemble charge air hoses and lines with lubricants containing oils, only coat with water (without additives) if necessary.

1. Note installation marks on hoses and components.
2. All hose connections for charge air system are secured by spring-type clamps or by connector couplings.
3. Install only approved clamps for securing hose connections .
4. Pliers for spring clamps VAS 5024 A or Hose clamp pliers V.A.G 1921 are recommended for installing spring clamps.

1. For connector couplings, always note the following points

1. Disengage connector coupling by pulling securing clip - arrow -.
2. Disconnect hose and pipe without the assistance of tools.

Scheme 521

1. When assembling, make sure the retaining tabs - A - are engaged securely.

1. Before screwing on oil supply line, fill turbocharger with engine oil at filler tube.
2. After installing turbocharger, let engine idle for approx. 1 minute without increasing engine speed. This ensures adequate oil supply to the turbocharger.

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

Rules of cleanliness

When working on turbocharger, carefully observe the following Rules of Cleanliness

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

1. Transport and protective packaging and sealing caps are to be removed only immediately prior to installation.
2. During repairs, clean oil from connections and hose ends.
3. When the system is open: Avoid working with compressed air if possible. Do not move vehicle unless absolutely necessary.

Turbocharger Recirculating Valve N249 , checking (AMB Engine Code)

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J220 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. On vehicles with automatic transmission, selector lever in position "P" or "N".

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

Procedure

1. Remove the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

Checking internal resistance

Scheme 522

1. Disconnect the Turbocharger Recirculating Valve N249 electrical harness connector - 2 -.

Scheme 523

1. Using a multimeter , check the Turbocharger Recirculating Valve N249 terminals 1 to 2 for resistance.

Specified value: 20 to 30 ohms (at approx. 20°C)

If the specification was not obtained

1. Replace the Turbocharger Recirculating Valve N249 --> «21 - TURBOCHARGER, G-CHARGER»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

If the specification was obtained

Checking Voltage supply

1. Using a multimeter , check the Turbocharger Recirculating Valve N249 electrical harness connector terminal 1 to Ground (GND).

1. Operate the starter briefly.

Specified value: battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

1. Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the 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. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

1. Using a multimeter , check the Turbocharger Recirculating Valve N249 electrical harness connector terminal 2 to Motronic Engine Control Module (ECM) J220 electrical harness connector terminal 105 for an open circuit.

Specified value: 1.5 ohms max.

If the specification is not obtained

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

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Install the engine cover with air filter. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Wastegate Bypass Regulator Valve N75 , checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J220 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. On vehicles with automatic transmission, selector lever in position "P" or "N".

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

Procedure

1. Remove the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

Checking internal resistance

1. Disconnect the Wastegate Bypass Regulator Valve N75 electrical harness connector - 1 -.

Scheme 524

1. Using a multimeter , check the Wastegate Bypass Regulator Valve N75 terminals 1 to 2 for resistance.

Specified value: 20 to 30 ohms (at approx. 20°C)

If the specification was not obtained

1. Replace the Wastegate Bypass Regulator Valve N75 --> «21 - TURBOCHARGER, G-CHARGER»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

If the specification is obtained

Checking Voltage supply

1. Using a multimeter , check the Wastegate Bypass Regulator Valve N75 electrical harness connector terminal 1 to Ground (GND).

1. Operate the starter briefly.

Specified value: battery voltage.

1. Switch the ignition off.

If the specification was not obtained

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

If no malfunction is found in the wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to chapter --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220)

1. Using a multimeter , check the Wastegate Bypass Regulator Valve N75 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) J220 electrical harness connector 104 for an open circuit.

Specified value: 1.5 ohms max.

If the specification is not obtained

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

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Install the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

1. Charge air system must be properly sealed.
2. Always replace self-locking nuts.
3. Charge air hoses and pipes as well as their connections must be free of oil and grease before re-installation.
4. Do not assemble charge air hoses and pipes with lubricants containing oils, only coat with water (without additives) if necessary.

1. Note installation marks on hoses and components.
2. All hose connections for charge air system are secured by spring-type clamps or by connector couplings.
3. Install only approved clamps for securing hose connections .
4. Spring Type Clip Pliers or Hose clamp pliers are recommended for installing spring clamps.

1. For connector couplings, always note the following points

1. Release connector coupling by pulling securing clip - arrow -.
2. Disconnect the hose and line without the assistance of tools.
3. When assembling, make sure the retaining tabs - A - are engaged securely.

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

When working on turbocharger, carefully observe the following Rules of Cleanliness

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

1. Transport and protective packaging and sealing caps are to be removed only immediately prior to installation.
2. During repairs, clean oil from connections and hose ends.
3. When the system is open: Avoid working with compressed air if possible. Do not move vehicle unless absolutely necessary.

Charge Air Pressure Sensor G31 , checking

Note. Use only gold-plated terminals when servicing terminals in harness connector of Charge Air Pressure Sensor G31.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J220 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. On vehicles with automatic transmission, selector lever in position "P" or "N".

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

Procedure

1. Remove the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

Test sequence

Scheme 525

1. Disconnect the Charge Air Pressure Sensor G31 electrical harness connector - arrow -.
2. Start engine and let it run at idle.

Scheme 526

1. Using a multimeter , check the Charge Air Pressure Sensor G31 electrical harness connector terminals 1 to 3 for voltage.

Specified value: min. 4.5 V

1. Switch the ignition off.

If the specification was not obtained

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

1. Using a multimeter , check the Charge Air Pressure Sensor G31 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J220 electrical harness connector terminals for an open circuit according to wiring diagram.

Specified value: 1.5 ohms max.

If the specification was not obtained

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

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

1. Replace the Charge Air Pressure Sensor G31 --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Install the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Motronic fuel injection system, servicing

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

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

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

Note. All manufacturers special tools as well as common tools may contain a manufacturer specific part number. These tools may be substituted with an equivalent aftermarket tool or are available for purchase through Audi. Manufacturers special tools as well as common tools that contain a manufacturer specific part number may be referenced in the test procedure illustrations showing the tool use or installation. If the manufacturer specific tool is not being used, an equivalent aftermarket tool may be installed in the same manner as the manufacturers special tool. The manufacturers test box Test Box 105 Pin VAG1598/31 is available for purchase or rental.

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

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

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

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

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

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

Technical data

Oxygen Sensor (O2S) Heater Z19 before catalytic converter, checking

Note. When servicing terminals in harness connector of Oxygen Sensor (O2S) Heater Z19 , use only gold-plated terminals.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Oxygen Sensor (O2S) Heater Z19 fuse OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

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

Procedure

1. Remove the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

Checking internal resistance

Scheme 527

1. Disconnect the Oxygen Sensor (O2S) Heater Z19 electrical harness connector - 5 -.

Scheme 528

1. Using a multimeter , check the Oxygen Sensor (O2S) Heater Z19 terminals 3+4 for an open circuit.

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

If the specification was not obtained

1. Replace the Oxygen Sensor (O2S) Heater Z19 --> «26 - EXHAUST SYSTEM, EMISSION CONTROLS»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

If the specification is obtained

Checking voltage supply

Scheme 529

1. Using a multimeter , check the Oxygen Sensor (O2S) Heater Z19 electrical harness connector terminal 4 to the Fuel Pump (FP) Relay J17 terminal 2 for voltage.

Specified value: Battery voltage.

If the specification was not obtained

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

If the specification was obtained

Checking Ground (GND) activation

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

1. Using a multimeter , check the Oxygen Sensor (O2S) Heater Z19 electrical harness connector terminal 4 to the Motronic Engine Control Module (ECM) J220 electrical harness connector terminal 5 for an open circuit.

Specified value: 1.5 ohms max.

If the specification was not obtained

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

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Install the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater Z29 , checking

Note. Vehicle must be raised before electrical harness connector for the Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater Z29 is accessible. When servicing terminals in harness connector of Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater Z29 , use only gold-plated terminals.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater Z29 fuse OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

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

Test sequence

Scheme 530

1. Remove the right vehicle floor cover - arrows -.

Checking internal resistance

1. Disconnect the Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater Z29 electrical harness connector - 2 -.

Scheme 531

1. Using a multimeter , check the Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater Z29 electrical harness connector terminals 1 to 2 for resistance.

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

If the specification was not obtained

1. Replace the Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater Z29 --> «26 - EXHAUST SYSTEM, EMISSION CONTROLS»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

If the specification was obtained

Checking voltage supply

1. Using a multimeter , check the Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater Z29 electrical harness connector terminal 1 to Fuel Pump Relay J17 terminal 2 for an open circuit.

1. Turn key on

Specified value: 12.5 Battery voltage.

If the specification was not obtained

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

If the specification was obtained

Checking Ground (GND) activation

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

Scheme 532

1. Using a multimeter , check the Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater Z29 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) J220 electrical harness connector terminal 63 for an open circuit according to the wiring diagram.

Specified value: 1.5 ohms max.

If the specification was not obtained

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

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Install the right vehicle floor cover.

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Mass Air Flow (MAF) Sensor G70 , checking

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

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.
3. Scan tool

Test requirements

1. The Mass Air Flow (MAF) Sensor G70 fuse OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

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

Function test

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

1. End diagnosis and switch ignition off.

If specified value is obtained, but DTC memory has a DTC concerning Mass Air Flow (MAF) Sensor G70

1. Check voltage supply of Mass Air Flow (MAF) Sensor G70 Checking voltage supply under «Mass Air Flow (MAF) Sensor G70 , checking»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__mass-air-flow-maf-sensor-g70) .

If specified value was not obtained

1. Check the Mass Air Flow (MAF) Sensor G70 electrical circuit Checking electrical circuit under «Mass Air Flow (MAF) Sensor G70 , checking»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__mass-air-flow-maf-sensor-g70) .

Scheme 533

1. Disconnect the Mass Air Flow (MAF) Sensor G70 electrical harness connector - 1 -.
2. Start the engine and let it run at idle.

Scheme 534

1. Using a multimeter , check the Mass Air Flow (MAF) Sensor G70 electrical harness connector terminal 3 to engine Ground (GND).

Specified value: battery voltage.

1. Switch the ignition off.

If specified value was not obtained

1. Check the Mass Air Flow (MAF) Sensor G70 electrical harness connector terminal 3 to the Fuel Pump Relay J17 terminal 2 for an open circuit.

Specified value: 1.5 ohms max.

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

Checking electrical circuit

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

1. Using a multimeter , check the Mass Air Flow (MAF) Sensor G70 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J220 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 each other, Battery (+), and Ground (GND).
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

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

1. Replace Mass Air Flow (MAF) Sensor G70 --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Throttle Valve Control Module J338 , 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 Motronic Engine Control Module (ECM) J220 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

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

Function

Throttle valve operation occurs by an electric motor (Throttle Drive (for Electronic Power Control (EPC)) G186) in the Throttle Valve Control Module J338. It is operated by the Motronic Engine Control Module (ECM) J220 and the Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185.

The Throttle Valve Control Module J338 is made up of the following components

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

The Throttle Valve Control Module J338 cannot be serviced separately and must be serviced as a unit.

Function test

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

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

1. End diagnosis and switch ignition off.

If the specified values are not obtained

1. Remove the Throttle Valve Control Module J338 far enough so that the electrical connector terminals are reached.

Scheme 535

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

Checking resistance

Scheme 536

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

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

If the specification was not obtained

1. Replace the Throttle Valve Control Module J338. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

If the specification was obtained

1. Check the voltage supply of the Throttle Valve Control Module J338 to the Motronic Engine Control Module (ECM) J220.
2. > Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 , checking (Engine Code AMB) .

Checking voltage supply and wiring

1. Switch the ignition on.

Scheme 537

1. Using a Multimeter , check the Throttle Drive (for Electronic Power Control (EPC)) G186 at the Throttle Valve Control Module J338 electrical harness connector terminals 2 to 6 for voltage.

Specified value: at least 4.5 V

1. Switch the ignition off.

If the specification was not obtained

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

Scheme 538

1. Using a Multimeter , check the Throttle Drive (for Electronic Power Control (EPC)) G186 at Throttle Valve Control Module J338 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J220 electrical harness connector terminals for an open circuit according to the wiring diagram.

Specified value: 1.5 ohms max.

If the specification is not obtained

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

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Engine Coolant Temperature (ECT) Sensor G2 , checking

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connector of Engine Coolant Temperature (ECT) Sensor G2.

Special tools, testers and auxiliary items required

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

Test requirements

1. The Motronic Engine Control Module (ECM) J220 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

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

Function test

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

If the specified value is not obtained

1. Continue test according to the following table

If the specified value was obtained

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

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

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

1. Replace the Engine Coolant Temperature (ECT) Sensor G2 --> «19 - ENGINE - COOLING SYSTEM»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

Checking internal resistance

Scheme 539

1. Disconnect the Engine Coolant Temperature (ECT) Sensor G2 electrical harness connector - arrow -.

Scheme 540

1. Using a multimeter , check the Engine Coolant Temperature (ECT) Sensor G2 terminals 1 to 2 for resistance.

Use the chart below for the specified values

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

Scheme 541

Specified values

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

If any of the specified values was not obtained

1. Replace the Engine Coolant Temperature (ECT) Sensor G2 --> «19 - ENGINE - COOLING SYSTEM»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

Testing if display is approx. - 40.0°C

1. Disconnect the Engine Coolant Temperature (ECT) Sensor G2 electrical harness connector - arrow -.
2. Using a jumper wire , connect the Engine Coolant Temperature (ECT) Sensor G2 electrical harness connector terminals 1 to 2.

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

If the value jumps to approx. 140.0°C

1. End diagnosis and switch the ignition off.
2. Replace the Engine Coolant Temperature (ECT) Sensor G2 --> «19 - ENGINE - COOLING SYSTEM»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

If indication remains at approx. -40.0°C

Testing if display approx. 140.0°C

1. Disconnect the Engine Coolant Temperature (ECT) Sensor G2 electrical harness connector - arrow -.

If indication jumps to approx. -40.0°C

1. End diagnosis and switch ignition off.
2. Replace the Engine Coolant Temperature (ECT) Sensor G2 --> «19 - ENGINE - COOLING SYSTEM»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

If indication remains at approx. 140.0°C

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

1. Using a Multimeter , check the Engine Coolant Temperature (ECT) Sensor G2 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J220 electrical harness connector terminals for an open circuit according to the wiring diagram.

Specified value: 1.5 ohms Max.

If the specification was not obtained

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

If no malfunction is detected in the wiring

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Intake Air Temperature (IAT) G42 , checking

Note. Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Intake Air Temperature (IAT) Sensor G42.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.
3. Cool spray (commercially available).

Test requirements

1. The Motronic Engine Control Module (ECM) J220 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

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

Function test

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

If the specified value is not obtained

1. Continue the test according to the following table

If the specified values are obtained

1. Remove the Intake Air Temperature (IAT) Sensor G42 --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .
2. Spray the Intake Air Temperature (IAT) Sensor G42 with a commercially available cool spray while observing the temperature value on the scan tool.

The temperature value must decrease.

1. End diagnosis and switch the ignition off.

If the intake air temperature does not decrease

1. Replace the Intake Air Temperature (IAT) Sensor G42 --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

If the intake air temperature does decrease

Checking internal resistance

Scheme 542

1. Disconnect the Intake Air Temperature (IAT) Sensor G42 electrical harness connector - arrow -.

1. Using a multimeter , check the Intake Air Temperature (IAT) Sensor G42 terminals 1 to 2 for resistance.

Use the chart below for the specified values

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

Specified values

Read-out examples

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

If any of the specified values are not obtained

1. Replace the Intake Air Temperature (IAT) Sensor G42 --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

Testing if display approx. -40°C or approx. -46°C

1. Disconnect the Intake Air Temperature (IAT) Sensor G42 electrical harness connector - arrow -.
2. Using a jumper wire , connect the Intake Air Temperature (IAT) Sensor G42 electrical harness connector terminals 1 to 2.

Scheme 543

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

If indication jumps to approx. 140°C

1. End diagnosis and switch ignition off.
2. Replace the Intake Air Temperature (IAT) Sensor G42 --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

If indication remains at approx. -40°C or -46°C

Testing if display approx. 140°C

1. Disconnect the Intake Air Temperature (IAT) Sensor G42 electrical harness connector - arrow -.

If indication jumps to approx. -40°C or -46°C

1. End diagnosis and switch ignition off.
2. Replace the Intake Air Temperature (IAT) Sensor G42 --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

If the indication remains at approx. 140°C

Checking wiring

Add as a workstep to the procedure where required.

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

1. Using a Multimeter , check the Intake Air Temperature (IAT) Sensor G42 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J220 electrical harness connector terminals for an open circuit according to the wiring diagram.

Specified value: 1.5 ohms Max.

If the specification was not obtained

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

If no malfunction is detected in the wiring

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Engine Speed (RPM) Sensor G28 , checking

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

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J220 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

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

Function

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

Function test

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

1. End diagnosis and switch ignition off.

If the specified value was not obtained

Checking internal resistance

1. Disconnect the gray Engine Speed (RPM) Sensor G28 electrical harness connector - 3 -.
2. Using a multimeter , check the Engine Speed (RPM) Sensor G28 terminals 2 to 3 for resistance.

Specified value: 730 to 1000 ohms (at approx. 20°C)

Scheme 544

1. Check Engine Speed (RPM) Sensor G28 terminals 1 to 2 and 1 to 3 for short circuits.

Specified value: infinity (infinity)

If any of the specified values are not obtained

1. Replace the Engine Speed (RPM) Sensor G28 --> «13 - ENGINE - CRANKSHAFT, CYLINDER BLOCK»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

If the specified values are obtained

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

Scheme 545

1. Using a Multimeter , check the Engine Speed (RPM) Sensor G28 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J220 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. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Remove the Engine Speed (RPM) Sensor G28 and check the sensor wheel for proper seating, damage and run-out --> «13 - ENGINE - CRANKSHAFT, CYLINDER BLOCK»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

If the sensor wheel is OK

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Fuel Injectors N30, N31, N32, N33 , checking

The following test procedure is used to diagnose all fuel injectors.

Special tools, testers and auxiliary items required

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

Test requirements

1. The Fuel Injectors N30, N31, N32, N33 fuses OK.
2. The Engine Speed (RPM) Sensor G28 OK, checking --> «Engine Speed (RPM) Sensor G28 , checking»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__engine-speed-rpm-sensor-g28) .
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

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

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

Procedure

1. Remove the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .
2. Disconnect the Fuel Injector electrical harness connectors from Fuel Injectors N30, N31, N32, N33.

Checking internal resistance

Scheme 546

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

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

If the specified value was not obtained

1. Replace the malfunctioning Fuel Injector --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

If the specified value was obtained

Checking activation and wiring

Scheme 547

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

LED should flicker.

1. Switch the ignition off.

If LED does not flicker

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

Scheme 548

1. Using a Multimeter , check the Fuel Injector electrical harness connector terminals to the Motronic Engine Control Module (ECM) J220 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 each other, Battery (+), and Ground (GND).
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is detected in the wiring

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Install the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Heated Oxygen Sensor (HO2S) G39 and oxygen sensor regulation before catalytic converter, checking

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

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

Scheme 549

1. The Heated Oxygen Sensor (HO2S) G39 fuse OK.
2. The Heated Oxygen Sensor (HO2S) G39 before catalytic converter OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

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

Function test

1. Connect scan tool.
2. Start the engine and let it run at idle.
3. Select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
4. Select "Test-ID 01: Oxygen sensor monitoring before catalytic converter".

1. Select "Test-ID 131: Dynamic test".
2. Check the specified values at idle.

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 black Heated Oxygen Sensor (HO2S) G39 electrical harness connector - 5

1. Using a multimeter , check the Heated Oxygen Sensor (HO2S) electrical harness connector - 1 - terminals 1 to 5 for voltage.

Specified value: 0.400 to 0.500 Volts

1. Switch the ignition off.

If the specified value was not obtained

1. Replace the Heated Oxygen Sensor (HO2S) G39 --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

If the specified value was obtained

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220.

1. Using a Multimeter , check the Heated Oxygen Sensor (HO2S) G39 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J220 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. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring

1. Replace the Motronic Engine Control Module (ECM) J220.

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 and oxygen sensor regulation behind catalytic converter, checking

The following procedure is used to diagnose Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130

Note. Vehicle must be raised before the electrical connector of the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 is accessible. When servicing terminals 3 and 4 in the electrical harness connector of the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 , use only gold-plated terminals.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 fuse Ok.
2. Oxygen Sensor (O2S) 1 (behind Three Way Catalytic Converter (TWC)) Heater Z29 OK. Refer to.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

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

1. Coolant Temperature at least 80°C.

Function test

1. Connect scan tool.
2. Start the engine and let it run at idle.
3. Select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
4. Select "Test-ID 02: Oxygen sensor monitoring behind catalytic converter".

1. Select following Test-IDs.
2. Check the specified values at idle.

If the specified values are obtained

1. End diagnosis and switch ignition off.

If the specified values are not obtained

1. Remove the right vehicle floor cover - arrows -.

Checking primary voltage

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

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

Specified value: 0.400 to 0.500 Volts

1. Switch the ignition off.

If the specified value was obtained

1. Replace the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 --> «26 - EXHAUST SYSTEM, EMISSION CONTROLS»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

If the specified value was not obtained

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220.

1. Using a Multimeter , check the Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J220 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. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

1. Install the right vehicle floor cover - arrows -.

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Function

Motronic Engine Control Module (ECM) J220 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) Relay J17 as well as On Board Diagnostic (OBD).

Motronic Engine Control Module (ECM) Power Supply Relay J271 , checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J220 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, selector lever in position "P" or "N".

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

Test sequence

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

Checking voltage

1. Using a Multimeter , check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/30 to Ground (GND).

Specified value: battery voltage.

If the specified value was not obtained

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

If the specified value was obtained

1. Switch the ignition on.
2. Using a Multimeter , check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 4/86 to Ground (GND).

Specified value: battery voltage.

If the specified value was obtained

Checking wiring

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

1. Turn key off.
2. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Using a Multimeter , check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 4/86 to the Motronic Engine Control Module (ECM) J220 electrical harness connector terminal 21 for resistance.

Specified value: 2.0 ohms Max.

If the specification was not obtained

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

If no malfunction is found in the wiring

Checking activation

1. Switch the ignition on.
2. Using a Multimeter , check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 5/87 to Engine Ground

Specified value: 12.5 V

1. Switch the ignition off.

If the specified value was not obtained

1. Replace the Motronic Engine Control Module (ECM) Power Supply Relay J271 : --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Motronic Engine Control Module (ECM) J220 , replacing

Removing

Special tools, testers and auxiliary items required

1. Heat gun.

Note. When the Motronic Engine Control Module (ECM) J220 electrical harness connectors are disconnected, the adaptation values are erased and the DTC memory content remains intact.

Work procedure

Check the identification of the previous Motronic Engine Control Module (ECM) J220 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.
2. End diagnosis and switch the ignition off.

Procedure

1. Switch the ignition on.
2. Actuate the touch-wipe function to allow the wipers to move to the end position.

Note. The wiper arms will now move into the line of view on the windshield (service position).

1. Remove the wiper arms caps.

Scheme 550

1. Loosen the wiper arm nuts - arrows - several turns.
2. Loosen the wiper arms from the wiper axle by rocking slightly.
3. Remove the wiper arms nuts and the wiper arms from the wiper axles.

Scheme 551

1. Remove the spray nozzles - arrow -.
2. Press the spray nozzles, with the water lines attached, through the plenum chamber opening.

Scheme 552

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

Note. The threads of the shear bolts have been coated with a locking compound and must be heated to be removed.

Scheme 553

The Motronic Engine Control Module (ECM) J220 is secured via a protective housing - 1 - and shear bolts - 2

1. Using a Heat gun set at its lowest setting, heat the shear bolt for approx. 20 to 25 seconds.
2. Remove the shear bolt with locking pliers. Discard the used shear bolts.

Repeat the previous steps for the second shear bolt.

1. Remove the protective housing from the Motronic Engine Control Module (ECM) J220.
2. Remove the front electrical harness connector - 1 - from the Motronic Engine Control Module (ECM) J220.

1. Remove the Motronic Engine Control Module (ECM) J220 from the retainer - arrow -.
2. Remove the rear electrical harness connector from the Motronic Engine Control Module (ECM) J220.

Motronic Engine Control Module (ECM) J220 installation

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

The Motronic Engine Control Module (ECM) J220 must be installed with the protective housing.

Use New shear bolts when installing the Motronic Engine Control Module (ECM) J220.

Motronic Engine Control Module (ECM) J220 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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

Speed Signal, checking

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

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Speedometer G21 OK.
2. The Motronic Engine Control Module (ECM) J220 fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

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

Function test

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

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

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

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

1. Check the wiring from the Motronic Engine Control Module (ECM) J220 to the Instrument Cluster Control Module J285 for an open circuit, Short to Battery (+), or to Ground (GND).
2. Check the wiring connection for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

Final procedures

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

1. Check the DTC memory.
2. If necessary, erase the DTC memory. Refer to «Diagnostic Mode 04: Reset/delete diagnostic data»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

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 Motronic Engine Control Module (ECM) J220 fuses OK.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

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

Function

The Motronic Engine Control Module (ECM) J220 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 Motronic Engine Control Module (ECM) J220 and the other control modules connected to the CAN-bus.

Trouble-free operation of the CAN-Bus requires that it have a terminal resistance. This central terminal resistance is located in the Motronic Engine Control Module (ECM) J220.

Procedure

1. Disconnect the Instrument Cluster Control Module J285 electrical harness connector.

Note. The Motronic Engine Control Module (ECM) J220 must remain connected for the following step.

1. Using a Multimeter , check the Instrument Cluster Control Module J285 electrical harness connector T32a/12 to T32a/13 for resistance.

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

If the specified value was not obtained

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

If no malfunction is found in the wiring

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

If the specified value was obtained

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Using a Multimeter , check the Instrument Cluster Control Module J285 electrical harness connector to the Motronic Engine Control Module (ECM) J220 electrical harness connector for resistance.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

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

If no malfunction is found in the wiring

1. Replace the Instrument Cluster Control Module J285.

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Exhaust system components, removing and installing

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 (TWC), checking

Function test

1. Connect the scan tool.
2. Start the engine and let it run at idle.
3. Select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
4. Select "Catalytic converter monitoring".

1. Select following OBDMID.
2. Check the specified values at idle.

1. End diagnosis and switch the ignition off.

If the specified values are exceeded

1. Replace the catalytic converter with front exhaust pipe --> «26 - EXHAUST SYSTEM, EMISSION CONTROLS»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Principle and function

Principle

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

Function

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

Secondary Air Injection (AIR) Solenoid Valve -N112- , checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse S234 OK.
2. The Fuel Pump (FP) Relay J17 OK.
3. Battery voltage at least 12.5 V.
4. All electrical consumers switched off (radiator fan must NOT run during test).

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

Procedure

Note. Voltage is supplied to the Secondary Air Injection (AIR) Solenoid Valve N112 from the Fuel Pump (FP) Relay J17.

Procedure

1. Disconnect the Secondary Air Injection (AIR) Solenoid Valve N112 electrical harness connector - 2 -.

Checking internal resistance

1. Using a multimeter , check the Secondary Air Injection (AIR) Solenoid Valve N112 terminals 1 to 2 for resistance.
2. Specified value: 25 to 35 ohms (at approx. 20°C)

If the specified value was not obtained

1. Replace the Secondary Air Injection (AIR) Solenoid Valve N112 : --> «26 - EXHAUST SYSTEM, EMISSION CONTROLS»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

If the specified value was obtained

Checking voltage supply

Crank the engine.

1. Using a multimeter , check the Secondary Air Injection (AIR) Solenoid Valve N112 electrical connector terminal 1 to Ground (GND) for voltage.

Specified value: battery voltage.

Switch the ignition off.

If the specified value was not obtained

1. Check the wiring from the Secondary Air Injection (AIR) Solenoid Valve N112 electrical connector terminal 1 to the Fuel Pump (FP) Relay J17 terminal 2 for a short circuit to Battery positive (+), Ground (GND), or an open circuit.
2. Check the electrical harness connector for damage, corrosion, lose or broken terminals.
3. If necessary, repair the wiring connection.

If no malfunctions are found in the wiring

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) (test box) at Engine Control Module.

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

1. Using a multimeter , check the Secondary Air Injection (AIR) Solenoid Valve N112 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) J220 electrical harness connector terminal 9 for an open circuit.

Specified value: 1.5 ohms Max.

If the specification was not obtained

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

If no malfunction is detected in the wiring

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Secondary Air Injection (AIR) Pump Relay -J299- , checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse S130 OK.
2. Fuse S234 OK.
3. The Fuel Pump (FP) Relay J17 OK.
4. Battery voltage at least 12.5 V.

1. All electrical consumers switched off (radiator fan must NOT run during test).
2. A/C switched off.
3. The ignition switched off.

Procedure

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

Checking voltage

1. Using a Multimeter , check the Secondary Air Injection (AIR) Pump Relay -J299- socket 8/87 to Ground (GND).

Specified value: battery voltage.

If the specified value was not obtained

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

If the specified value was obtained

1. Crank the engine.
2. Using a Multimeter , check the Secondary Air Injection (AIR) Pump Relay -J299- socket 4/86 for voltage.

Specified value: battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

1. Check the wiring connection from the Fuel Pump (FP) Relay J17 socket 2 to the Secondary Air Injection (AIR) Pump Relay -J299- socket 4/86 for an open circuit or a short circuit.
2. Check the wiring connections for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) (test box) at Engine Control Module.

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Using a Multimeter , check the Secondary Air Injection (AIR) Pump Relay -J299- socket 6/T to the Motronic Engine Control Module (ECM) J220 electrical harness connector terminal 66 for resistance.

Specified value: 1.5 ohms Max.

If the specification was not obtained

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

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

1. Replace the Secondary Air Injection (AIR) Pump Relay -J299-. Refer to --> «26 - EXHAUST SYSTEM, EMISSION CONTROLS»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Secondary Air Injection (AIR) Pump Motor -V101- , checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. Fuse S130 OK.
2. The Fuel Pump (FP) Relay J17 OK.
3. Battery voltage at least 12.5 V.
4. All electrical consumers switched off (radiator fan must NOT run during test).

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

Procedure

Scheme 554

1. Remove the center noise insulation fasteners - arrows - and noise insulator.

Scheme 555

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

Checking voltage

1. Crank the engine.

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

Specified value: battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

1. Check the wiring connection from the Secondary Air Injection (AIR) Pump Relay -J299- socket 2/30 to the Secondary Air Injection (AIR) Pump Motor -V101- electrical harness connector terminal 2 for an open circuit or a short circuit.
2. Check the wiring connections for damage, corrosion, lose or broken terminals.
3. If necessary, repair the faulty wiring connection.

If the specified value was obtained

Checking Ground (GND)

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

Specified value: 1.5 ohms Max.

If the specification was not obtained

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

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

1. Replace Secondary Air Injection (AIR) Pump Motor -V101- --> «26 - EXHAUST SYSTEM, EMISSION CONTROLS»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

General notes on ignition system

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

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

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

Note. All manufacturers special tools as well as common tools may contain a manufacturer specific part number. These tools may be substituted with an equivalent aftermarket tool or are available for purchase through Audi. Manufacturers special tools as well as common tools that contain a manufacturer specific part number may be referenced in the test procedure illustrations showing the tool use or installation. If the manufacturer specific tool is not being used, an equivalent aftermarket tool may be installed in the same manner as the manufacturers special tool. The manufacturers test box Test Box 105 Pin VAG1598/31 is available for purchase or rental.

If engine is to be cranked at starting RPM without starting, e.g. for a compression test

1. Remove Fuse 6 (on fuse panel B) SB6 and Fuse 29 (on fuse panel B) SB29 from the fuse holder, E-box, plenum chamber.

By removing Fuse 6 (on fuse panel B) SB6, voltage supply of Ignition Coils with Power Output Stage N70, N127, N291, N292 is interrupted, that of Fuel Injectors N30, N31, N32, N33 by removing Fuse 29 (on fuse panel B) SB29.

Test Data, Spark Plugs

Camshaft Position (CMP) Sensor G40 , checking

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

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Motronic Engine Control Module (ECM) J220 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

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

Procedure

1. Remove the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

Scheme 556

1. Disconnect the Camshaft Position (CMP) Sensor G40 electrical harness connector - 1 -.
2. Switch the ignition on.

Scheme 557

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

Specified value: about 5.0 V

1. Switch the ignition off.

If the specification was not obtained

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

Scheme 558

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

Specified value: 1.5 ohms Max.

If the specified value was not obtained

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

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

1. Replace the Camshaft Position (CMP) Sensor G40 --> «28 IGNITION/GLOW PLUG SYSTEM»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Install the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Camshaft Adjustment Valve 1 N205 , checking

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The Camshaft Adjustment Valve 1 N205 fuse OK.
2. Motronic Engine Control Module (ECM) Power Supply Relay J271 OK, checking --> Electrical Wiring Diagrams, Troubleshooting and Component Locations.
3. Battery voltage at least 12.5 volts.
4. All electrical consumers such as, lights and rear window defroster, switched off.

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

Procedure

1. Remove the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

Scheme 559

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

Scheme 560

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

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

If the specified value was not obtained

1. Replace the Camshaft Adjustment Valve 1 N205 --> «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

If the specified value was obtained

Checking voltage

1. Switch the ignition on.
2. Using a Multimeter , Check the Camshaft Adjustment Valve 1 N205 electrical harness connector terminal pin 1 ground.
3. Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained

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

If the specified value was obtained

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

Scheme 561

1. Using a Multimeter , Check the Camshaft Adjustment Valve 1 N205 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) electrical harness connector terminal 115 for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

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

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Install the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Knock Sensor (KS) 1 G61/Knock Sensor (KS) 2 G66 , checking

The following procedure is used to diagnose all Knock Sensors.

Special tools, testers and auxiliary items required

1. Multimeter.
2. Wiring diagram.

Test requirements

1. The mounting bolt of Knock Sensor (KS) 1 G61/Knock Sensor (KS) 2 G66 tightened to 20 Nm.

1. The Motronic Engine Control Module (ECM) J220 fuses OK.
2. Battery voltage at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster, switched off.
4. Vehicles with automatic transmission, shift selector lever into position "P" or "N".

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

Procedure

1. Remove the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

Note. Before disconnecting the Knock Sensor electrical harness connectors, mark the component location.

Scheme 562

1. Disconnect the green Knock Sensor (KS) 1 G61 electrical harness connector - 1 - or the gray Knock Sensor (KS) 2 G66 electrical harness connector - 2 -.

Checking internal resistance

Scheme 563

1. Using a Multimeter , check the Knock Sensor terminals 1 to 2 for an internal short.

Specified value: infinity (Infinity).

If the specified value was not obtained

1. Replace the faulty Knock Sensor (KS) 1 G61/Knock Sensor (KS) 2 G66 --> «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

If the specified value was obtained

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

1. Using a Multimeter , Check the Knock Sensor electrical harness connector to the Motronic Engine Control Module (ECM) J220 electrical harness connector for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

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

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

1. Replace the faulty Knock Sensor (KS) 1 G61/Knock Sensor (KS) 2 G66 --> «15 - ENGINE - CYLINDER HEAD, VALVETRAIN»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-mechanical-engine-codes-amb) .

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

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .
2. Install the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Ignition Coils with Power Output Stage N70, N127, N291, N292 , checking

The following procedure is used to diagnose all Ignition Coils with Power Output Stage.

Special tools, testers and auxiliary items required

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

Test requirements

1. The Ignition Coils with Power Output Stage N70, N127, N291, N292 fuses OK.
2. The Motronic Engine Control Module (ECM) Power Supply Relay J271 OK, --> «Motronic Engine Control Module (ECM) Power Supply Relay J271 , checking»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-power)
3. The Engine Speed (RPM) Sensor G28 OK, --> «Engine Speed (RPM) Sensor G28 , checking»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__engine-speed-rpm-sensor-g28) .
4. The Camshaft Position (CMP) Sensor G40 OK, --> «Camshaft Position (CMP) Sensor G40 , checking»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__camshaft-position-cmp-sensor-g40) .

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

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

Procedure

1. Remove the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

Scheme 564

1. Remove the Ignition Coils with Power Output Stage N70, N127, N291, N292 electrical harness screws - 1 -.

Scheme 565

1. Disconnect the Ignition Coils with Power Output Stage N70, N127, N291, N292 electrical harness connectors - arrows - from the Ignition Coils with Power Output Stage N70, N127, N291, N292.

Checking voltage supply

1. Switch the ignition on.

1. Using a Multimeter , check the Ignition Coil electrical harness connector terminals 1 to 4 for voltage.

Specified value: battery voltage.

1. Switch the ignition off.

If the specified value was not obtained

1. Check the Ignition Coil electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 terminal 8/87 for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

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

If the specified values were obtained

Checking activation

1. Disable the power supply to the Fuel Injectors N30, N31, N32, N33 by removing Fuse 29 (on fuse panel B) from the fuse holder SB29, in the E-box, plenum chamber.

1. Using a diode test lamp , check the Ignition Coil electrical harness connector terminals 2 to 3 for voltage.
2. Operate the starter.

The LED should flicker.

1. Switch the ignition off.

If the LED flickers and the voltage was OK

1. Replace the faulty Ignition Coils with Power Output Stage N70, N127, N291, N292 --> «28 IGNITION/GLOW PLUG SYSTEM»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

If the LED does not flicker

Checking wiring

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

1. Install the test box. Refer to --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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

1. Remove the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

1. Using a Multimeter , Check the Ignition Coil electrical harness connector to the Motronic Engine Control Module (ECM) J220 electrical harness connector for an open circuit.

Specified value: 1.5 ohms Max.

If the specified value was not obtained

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

If the specified values were obtained

1. Replace the Motronic Engine Control Module (ECM) J220. Refer to --> «Motronic Engine Control Module (ECM) J220 , replacing»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__motronic-engine-control-module-ecm-j220) .

Scheme 566

1. Connect the Ignition Coils with Power Output Stage N70, N127, N291, N292 electrical harness connectors - arrows - to the Ignition Coils with Power Output Stage N70, N127, N291, N292.

1. Install the Ignition Coils with Power Output Stage N70, N127, N291, N292 electrical harness screws - 1 -.
2. Install the engine cover with air filter --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-fuel-injection-ignition-engine-codes-amb) .

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/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
3. If the DTC memory was erased, generate readiness code. Refer to «Readiness Code»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. End of diagnosis.

Continuously Variable Transmission (CVT) 01J, Checking

For electrical diagnosis of the Continuously Variable Transmission (CVT) 01J, Refer to the -->

1. «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(/audi/a4/b6-2000-2006/remont/differentials-drive-axles/#continuously-variable-transmission-cvt-01j) for CONTINUOUSLY VARIABLE TRANSMISSION (CVT) 01J
2. «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(/audi/a4/b6-2000-2006/remont/differentials-drive-axles/#continuously-variable-transmission-cvt-01j-internal-components-servicing) for CONTINUOUSLY VARIABLE TRANSMISSION (CVT) 01J - INTERNAL COMPONENTS, SERVICING

Continuously Variable Transmission (CVT) 01V, Checking

For electrical diagnosis of the Continuously Variable Transmission (CVT) 01V, Refer to the -->

1. «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(/audi/a4/b6-2000-2006/remont/differentials-drive-axles/#5-speed-automatic-transmission-01v) for 5 SPD. AUTOMATIC TRANSMISSION 01V
2. «38 - AUTOMATIC TRANSMISSION - GEARS, HYDRAULIC CONTROLS»(/audi/a4/b6-2000-2006/remont/differentials-drive-axles/#5-speed-automatic-transmission-01v-front-and-all-wheel-drive-internal-components-servicing) for 5 SPD. AUTOMATIC TRANSMISSION 01V FRONT AND ALL WHEEL DRIVE - INTERNAL COMPONENTS, SERVICING

Generic Scan Tool (GST) Manual Contents

Included in the contents of this Generic Scan Tool (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 Generic Scan Tool (GST) manual and can be easily identified as. e.g. Bosch Motronic ME 7 OBD System Strategy.

This Generic Scan Tool (GST) manual also contains the step by step pin point test procedures to accurately diagnose and repair 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 and easily identified as. e.g. --> 24 MULTIPORT FUEL INJECTION (MFI) .

On Board Diagnostic (OBD) Systems

OBD II

OBD is an abbreviation 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.

Serial Data Link (MIL) Illumination

MIL is an abbreviation for the Malfunction Indicator Lamp (MIL).

If the Engine Control Module (ECM) recognizes a malfunction that leads to increased emissions values, it indicates them by lighting the Malfunction Indicator Lamp (MIL) which is located in the instrument cluster.

The Engine Control Module (ECM) switches on the Malfunction Indicator Lamp (MIL) after the ignition is switched on. Shortly after the engine is started, The Malfunction Indicator Lamp (MIL) goes out if the Engine Control Module (ECM) does not detect a malfunction that increases the emissions values.

If the Engine Control Module (ECM) recognizes a malfunction that leads to increased emissions during the operation of the engine, the Engine Control Module (ECM) switches on the Malfunction Indicator Lamp (MIL) and an entry is stored in the DTC memory of the Engine Control Module (ECM).

Controller Area Network (CAN) Data Link

CAN is an abbreviation for Controller Area Network.

The Engine Control Module (ECM) communicates with all databus capable control modules via a CAN Data Link.

The databus capable control modules (i.e. Engine Coolant temperature Sensor) are connected via two data bus wires which are twisted together (CAN_High and CAN_Low), and exchange information (messages) to the Engine Control Module (ECM). Missing information on the databus is then recognized and stored as a malfunction.

The Engine Control Module (ECM) illuminates the Malfunction Indicator Lamp (MIL) through the CAN data link and tells the Malfunction Indicator Lamp (MIL) to turn on, turn off, or blink.

Electronic Power Control (EPC) Warning Lamp

EPC is an abbreviation that stands for the Electronic Power Control (E-gas).

The Engine Control Module (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 Engine Control Module (ECM) switches on the Electronic Power Control (EPC) Warning Lamp which is located in the instrument cluster and an entry is stored in the DTC memory of the Engine Control Module (ECM).

Diagnostic Modes Description

The information provided in Modes 01 through 09 displays the various levels of emission related data that may be monitored, as well as the ability to retrieve and read stored DTC trouble codes , erase stored DTC trouble codes, generate readiness codes, and select the various PIDs and OBDMIDs 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 displayed may be referred to by different names such as OBDMID (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.

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 OBDMID (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.
2. End of diagnosis.

Diagnostic Mode 02: Obtain operating conditions

Diagnostic Mode 02 is used to monitor the operating conditions under which the Motronic Engine Control Module (ECM) J220 has detected and stored an emissions related DTC.

Depending on scan tool and protocol used, the information displayed in diagnostic mode 02 may be referred to by different names such as OBDMID (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.

Procedure

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

Note. If the engine does not start, crank the engine using starter for at least 5 seconds, do not switch the ignition off afterward under any circumstances.

1. Select "Diagnostic Mode 2: Obtain operating conditions.".
2. From the following table, select the desired the "PID" , e.g. "PID 05-Coolant temperature" that is to be 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.
2. End of diagnosis.

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.

Depending on scan tool and protocol used, the information displayed in diagnostic mode 03 may be referred to by different names such as OBDMID (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.

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

P-Codes

U-Codes

Interrogating the Fault Memory

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

1. Refer to the following DTC tables for the diagnostic repair procedure

1. SAE P0xxxDTCs --> «SAE P0xxx-DTCs»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .
2. SAE P1xxx-DTCs --> «SAE P1xxx-DTCs»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .
3. SAE P2xxxDTCs --> «SAE P2xxx-DTCs»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .
4. SAE P3xxxDTCs --> «SAE P3xxx-DTCs»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. Switch the ignition off.
2. End of diagnosis.

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.

Depending on scan tool and protocol used, the information displayed in diagnostic mode 04 may be referred to by different names such as OBDMID (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.

Procedure

1. Connect the scan tool.
2. Switch the ignition on.
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.
2. End of diagnosis.

Diagnostic Mode 05: Check lambda test results

Diagnostic Mode 05 allows access to the Oxygen Sensor test results. Mode 05 is divided into test identifiers (TIDS).

The values of the individual test results must reach the specified value or must be within the min. and max. limits.

Depending on scan tool and protocol used, the information displayed in diagnostic mode 05 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 requirements

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

Work procedure

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

Note. If the engine does not start, crank the engine using starter for at least 5 seconds, do not switch the ignition off afterward under any circumstances.

1. Select "Mode 5: Check lambda test results.".
2. Select the desired "Test-ID" of the component or system that is to be monitored, e.g. "Test-ID 08: Oxygen Sensor Monitor Bank 1 - Sensor 1".
3. Select the desired "Test-ID".

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

The following table is a numerical list of all "Test-IDs" or "Hex-IDs" that may be selected.

"Test A" : Test results for Oxygen Sensor Monitor Bank 1 - Sensor 1

1. Connect the scan tool.
2. Start the engine and run at idle.
3. Select "Mode 5: Check lambda test results".

Select "Test A".

1. Select the desired "Test-ID (TID)" or "Hex-ID".
2. Check specified values at idle.

1. If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTCs or the corresponding diagnostic repair procedure --> «Mode 03: Interrogating fault memory»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__mode-03-interrogating-fault-memory) .
2. Switch the ignition off.
3. End of diagnosis.

"Test B" : Test results for Oxygen Sensor Monitor Bank 1- Sensor 2

1. Connect the scan tool.
2. Start the engine and run at idle.
3. Select "Mode 5: Check lambda test results".

Select "Test B".

1. Select the desired "Test-ID (TID)" or "Hex-ID".
2. Check specified values at idle.

1. If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTCs or the corresponding diagnostic repair procedure --> «Mode 03: Interrogating fault memory»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__mode-03-interrogating-fault-memory) .
2. Switch the ignition off.
3. End of diagnosis.

Diagnostic Mode 06: Checking test results of components that are not continuously monitored

Diagnostic Mode 06 displays the test results of emission related components and systems which are not continuously monitored.

The values of the individual test results must reach the specified value or must be within the min. and max. limits.

Depending on 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 be referenced by only a number.

Test requirements

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

Work procedure

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

Note. If the engine does not start, crank the engine using starter for at least 5 seconds, do not switch the ignition off afterward under any circumstances.

1. Select "Mode 6: Check test the results of components that are not continuously monitored".
2. Select the desired "Test-ID" of the component or system that is to be monitored, e.g. "Test-ID 01: Oxygen Sensor Monitor Bank 1 - Sensor 1".
3. Select the desired "Test-ID".

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

The following table is a numerical list of all "Test-IDs" or "Hex-IDs" that may be selected.

TID 01 ($01): Catalytic Conversion (Bank 1)

1. Connect the scan tool.
2. Start the engine and run at idle.
3. Select "Mode 6: Check test the results of components that are not continuously monitored".

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

1. Select the desired "Component-ID (CID)" or "Hex-ID".
2. Check specified values at idle.

1. If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTCs or the corresponding diagnostic repair procedure --> «Mode 03: Interrogating fault memory»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__mode-03-interrogating-fault-memory) .
2. Switch the ignition off.
3. End of diagnosis.

TID 02 ($02): Oxygen Sensor Bank 1- Sensor 1

1. Connect the scan tool.
2. Start the engine and run at idle.
3. Select "Mode 6: Check test the results of components that are not continuously monitored".

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

1. Select the desired "Component-ID (CID)" or "Hex-ID".
2. Check specified values at idle.

1. If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTCs or the corresponding diagnostic repair procedure --> «Mode 03: Interrogating fault memory»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__mode-03-interrogating-fault-memory) .
2. Switch the ignition off.
3. End of diagnosis.

TID 03 ($03): Secondary Air Injection (AIR) System

1. Connect the scan tool.
2. Start the engine and run at idle.
3. Select "Mode 6: Check test the results of components that are not continuously monitored".

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

1. Select the desired "Component-ID (CID)" or "Hex-ID".
2. Check specified values at idle.

1. If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTCs or the corresponding diagnostic repair procedure --> «Mode 03: Interrogating fault memory»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__mode-03-interrogating-fault-memory) .
2. Switch the ignition off.
3. End of diagnosis.

TID $05 (05): Tank Ventilation System, Tank Vent Valve Function

1. Connect the scan tool.
2. Start the engine and run at idle.
3. Select "Mode 6: Check test the results of components that are not continuously monitored".

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

1. Select the desired "Component-ID (CID)" or "Hex-ID".
2. Check specified values at idle.

1. If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTCs or the corresponding diagnostic repair procedure --> «Mode 03: Interrogating fault memory»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__mode-03-interrogating-fault-memory) .
2. Switch the ignition off.
3. End of diagnosis.

TID $05 (05): Tank Ventilation System, Tank Leak Test

1. Connect the scan tool.
2. Start the engine and run at idle.
3. Select "Mode 6: Check test the results of components that are not continuously monitored".

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

1. Select the desired "Component-ID (TID)" or "Hex-ID".
2. Check specified values at idle.

1. If any of components or systems fail to meet the specified values. Refer to Diagnostic "Mode 03: Interrogating Fault Memory" to check for stored DTCs or the corresponding diagnostic repair procedure --> «Mode 03: Interrogating fault memory»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__mode-03-interrogating-fault-memory) .
2. Switch the ignition off.
3. End of diagnosis.

Diagnostic Mode 07: Check test results of components that are continuously monitored

Diagnostic Mode 07 displays all stored DTCs of emission related components and systems which are continuously monitored.

Note. Depending on scan tool and protocol used, diagnostic mode 07 and the information provided may be referred to by a different name.

Test requirements

1. No DTCs stored in the DTC memory.
2. Coolant temperature at least 80°C.

Procedure

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

Note. If the engine does not start, crank the engine using starter for at least 5 seconds, do not switch the ignition off afterward under any circumstances.

1. Select "Mode 7: Check test results of components that are continuously monitored".

The number of stored DTCs or "0 malfunctions detected" will be displayed scan tool screen.

1. Switch the ignition off.
2. Refer to the following DTC tables for the diagnostic repair procedure

1. SAE P0xxxDTCs --> «SAE P0xxx-DTCs»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .
2. SAE P1xxx-DTCs --> «SAE P1xxx-DTCs»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .
3. SAE P2xxxDTCs --> «SAE P2xxx-DTCs»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .
4. SAE P3xxxDTCs --> «SAE P3xxx-DTCs»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb) .

1. Switch the ignition off.
2. End of diagnosis.

Diagnostic Mode 08: Tank leak test

Diagnostic Mode 08 is used to test the fuel system for leaks.

Note. Depending on scan tool and protocol used, diagnostic mode 08 and the information provided may be referred to by a different name.

Note. If the accelerator pedal is depressed during the test, the test will be aborted.

Test requirements

1. No DTCs stored in the DTC memory.
2. Intake Air Temperature (IAT) maximum 60°C.
3. Coolant temperature 80 -110°C.
4. Throttle valve angle 12.0 - 16.0%.

Procedure

1. Connect the scan tool.
2. Start the engine and run at idle for at least 15 minutes.
3. Select "Mode 8: Tank Leak Test".
4. Select "OBDMID 01: Tank Leak Test".

1. Check the specified value of the tank leak test at idle.
2. The following will be displayed on the scan tool screen

1. Switch the ignition off.

If the specified value is obtained

1. Refer to "Diagnostic mode 03: Interrogating fault memory " to check for any DTCs that may be stored --> «Mode 03: Interrogating fault memory»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__mode-03-interrogating-fault-memory) .
2. To repeat the tank test, switch the ignition off and start the engine again and let run for 15 minutes at idle.
3. Switch the ignition off.
4. End of diagnosis.

Diagnostic Mode 09: Vehicle information

Note. For all calibration and immobilizer information. Refer to the EBAHN-Website.

Diagnostic Mode 09 is used to display vehicle specific information, e.g. the different Engine Control Module (ECM) versions.

Note. Depending on scan tool and protocol used, diagnostic mode 09 and the information provided may be referred to by a different name.

Test requirement

1. No DTCs stored in the DTC memory.

Procedure

1. Connect the scan tool.
2. Switch the ignition on.
3. Select "Mode 09: Vehicle information".
4. Select the desired "OBDMID".

1. The information requested will be displayed on the scan tool screen.

The following table is a numerical list of all "OBDMIDs" that may be selected.

1. Switch the ignition off.
2. End of diagnosis.

Readiness Code Description

Diagnostics are performed at regular intervals during normal vehicle operation. After repairing an emissions related system, a readiness code is generated by road testing the vehicle.

If a malfunction is recognized during the drive cycle, it will be stored in the DTC memory.

The OBD drive cycle operation will be monitored with a hand held diagnostic tool. Consult the manufacturers instruction manual for correct tool operation.

The readiness code is erased every time the DTC memory is erased or any time the battery is disconnected. If the DTC memory has been erased or the battery is disconnected, a new readiness code must be generated.

Only erase the DTC memory if a DTC has been stored.

General Recommendations

Most monitors will complete easier and quicker using a steady-foot and smooth acceleration during the drive cycle operation, cruise, and acceleration modes.

Operating Conditions

For the EVAP monitor test, the coolant temperature and the ambient air temperature must be between 10°C and 35°C with a difference between them no greater than 4°C. The ambient air temperature must not change more than 4°C during the drive cycle procedure (e.g. when driving out of a heated workshop in the winter).

Test requirements

1. Erase the DTC memory --> «Diagnostic Mode 04: Reset/delete diagnostic data»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__diagnostic-mode-04-resetdelete-diagnostic-data) .
2. Coolant temperature must be between 80°C - 110°C.
3. The Intake Air Temperature (IAT) must be between 10°C - 35°C.
4. Battery voltage must be a minimum of 12.5 volts.

1. Fuel tank level 1/4 - 3/4 full.

Drive Cycle Procedure

1. Connect the scan tool.
2. Switch the ignition on and start the vehicle.
3. Idle the vehicle for 2-3 minutes. This executes the O2S Heater, Misfire, Secondary AIR, Fuel Trim, and Purge system monitors.
4. Drive the vehicle at 45-55 mph for a continuous 7 minute period, avoid stopping. This executes the EVAP, O2S, Fuel Trim, and Misfire monitors.

1. Accelerate the vehicle to an engine speed of 5000 RPM (with automatic transmission use the tip-tronic mode); lift off the throttle until the engine speed is around 1200 rpm. This executes the fuel cut off
2. Accelerate the vehicle smoothly to 60-65 mph, cruise constantly for 5 min, this executes the Catalyst; O2S, Misfire, Fuel Trim, and Purge System monitors.
3. Decelerate and idle the vehicle again for 3 minutes. This executes the Misfire, Secondary AIR, Fuel Trim, and Purge system monitors.
4. Check the status of the readiness code.

Note. Depending on the scan tool used. The readiness code status may be displayed as complete, passed or OK.

1. If any engine monitor fails the drive cycle test. Repeat the drive cycle test until all engine monitors have successfully run through and passed.

Note. When repeating the drive cycle operation for a failed EVAP monitor or thermostat-monitor, allow the engine to cool until the coolant temperature and the ambient air temperature are be between 10°C - 35°C with a difference between them no greater than 4°C is observed and repeat the drive cycle operation.

If the drive cycle operation fails again.

1. Check the DTC memory for stored DTCs --> «Mode 03: Interrogating fault memory»(/audi/a4/b6-2000-2006/remont/blowers-superchargers-turbochargers/#18l-4-cyl-5v-turbo-engine-controls-generic-scan-tool-engine-codes-amb__mode-03-interrogating-fault-memory) .

Repair the vehicle if necessary.

1. Repeat the drive cycle operation until all engine monitors have successfully run through and passed.
2. Remove the scan tool and switch the ignition off.
3. End of operation.

Fuel and air ratios

Refer to: Bosch Motronic ME 7 OBD System Strategy; Comprehensive Components Monitoring

Ignition system

Additional exhaust regulation

Speed and idle control

Control module and output signals

Transmission 01V

Fuel and Air ratios, control module

Fuel and air ratio

Additional emission regulations