4.2l v8 5v Generic Scan Tool, Engine Code(s): Bfm Audi A8 D3 рестайлинг

OBD, General Information

> OBD Characteristics

> OBD Technical Data

> Diagnostic Tester, Connecting

> Wire and Component Test at Engine Control Module using VAG 1598/31

> Catalytic Converter Warning Lamp, Checking

OBD Characteristics

The ECM (Engine Control Module) J623 and Transmission Control Module (on vehicles with automatic transmission) are equipped with a DTC memory.

Malfunction Recognition

If malfunctions occur at the emission relevant systems or components, they are stored in DTC memory with a description of the malfunction type.

Engine control module and transmission control module differentiate between DTCs after analyzing information retrieved DTC tables on --> SAE P0xxx Diagnostic Trouble Codes .

The stored malfunctions can be checked with a standard diagnostic tester --> Diagnostic Mode 03 - Read DTC Memory .

When disconnecting harness connectors from Engine Control Module (ECM) or Transmission Control Module (TCM), or when disconnecting battery, all adaptation values in the control modules are erased. DTC memory content will remain intact however. After re-connecting harness connectors or battery, or after performing corrective actions.

The following work steps must be performed in the described sequence after the malfunction(s) have been repaired

1. Check DTC memory , Diagnostic mode 3: Check DTC memory.
2. Erase DTC memory , Diagnostic mode 4: Reset/erase diagnostic data.
3. Then generate readiness code.

1. End diagnosis and switch ignition off.

OBD Technical Data

Control Modules Identification

The control module version is displayed when "Mode 9: Vehicle information" is selected --> Diagnostic Mode 09 - Read Vehicle Information .

Engine Control Module (ECM) equipment

*Independent of voltage supply.

*Values are lost when voltage supply is interrupted.

TCM equipment (Display under "1A")

*Independent of voltage supply.

*Values are erased when voltage supply is interrupted.

Selectable diagnostic modes under address word 33 - OBD

Note. The conditions required for selecting the desired diagnostic mode are listed in the following table

*Perform only with ignition switched on when engine does not start (operate starter beforehand for at least 6 seconds).

* Can be selected only in conjunction with Engine Control Module (ECM) (display under "10 - Engine electronics").

Diagnostic Tester, Connecting

Special tools, testers and auxiliary items required

Scheme 696

1. Vehicle Diagnostic and Information System VAS5052 with
2. Diagnostic cable VAS5052/3

Prerequisites

1. The respective fuses of the Motronic fuel injection and ignition system or automatic transmission must be OK: --> Electrical Wiring Diagrams, Troubleshooting and Component Locations
2. Battery voltage must be at least 12.5 Volts.
3. Parking brake must be engaged in order to connect the electrical parking brake.
4. For vehicles with automatic transmission, selector lever must be in position P or N.

1. Ground (GND) connections between engine, transmission and body must be OK.
2. All electrical consumers such as, lights and rear window defroster must be switched off.
3. A/C switched off.
4. Ignition switched off.

Procedure

Connect diagnostic tester (VAS5052) using diagnostic cable (VAS5052/3) as follows

Scheme 697

1. Connect diagnostic cable connector to Data Link Connector (DLC) (- arrow -).
2. Depending on the desired diagnostic mode, it is necessary to: switch on ignition

or start engine --> Selectable diagnostic modes under address word 33 - OBD under OBD Technical Data .

Note. Respective operation of the diagnostic tester: , Operating instructions of the diagnostic tester. If no display appears on diagnostic tester, check voltage supply at Data Link Connector (DLC): --> Electrical Wiring Diagrams, Troubleshooting and Component Locations

Scheme 698

Note. Test box VAG1598/31 is designed so that it can be simultaneously connected to the wiring harness at the Engine Control Module (ECM) and also to the ECM itself. This is advantageous because electronic engine control remains fully functional (e.g. measurement of signals with engine running) when the test box is attached. Relevant test procedures note whether Engine Control Module (ECM) should also be connected to the test box or not. Use the following for the test: portable multimeter VAG1526 or the multimeter VAG1715 and the voltage test lamp VAG1527. Always use adapter cables from connector test kit VAG1594 for connecting special tools to the test box VAG1598/31.

VAG1598/31, Connecting

1. Switch ignition off.
2. Remove right cover from plenum chamber.

Scheme 699

1. Open both bolts (- arrows -) and remove Engine Control Module (ECM) toward front.

Scheme 700

To complicate accessibility to the harness connectors at Engine Control Module (ECM), Engine Control Module (ECM) - 1 - is screwed to a protective housing - 4 - via a locking mechanism - 2 - and snap-off screws - 3 -.

The thread of the snap-off screws is coated with locking compound to additionally complicate removal of the snap-off screws.

To be able to disconnect harness connectors from Engine Control Module (ECM) (e.g. when connecting test box or when replacing Engine Control Module), Engine Control Module (ECM) must be removed from protective housing. This procedure is described in the following.

Required Equipment

Scheme 701

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

Procedure

1. "Flip" Engine Control Module (ECM) with protective housing in direction of engine compartment so that the locking mechanism (- 2 - in illustration) becomes visible, place a clean rag below the Engine Control Module (ECM) with protective housing.

Scheme 702

1. Perform adjustments on heat gun as shown in illustration, i.e., potentiometer for temperature selection - 2 - to maximum heat output and the two-stage switch for air flow - 3 - to position 3.

Note. Next, the thread of locking mechanism in which the snap-off screws are threaded in are heated using the heat gun. This step lowers the inhibition effect of the locking compound on the thread of the snap-off screws, to ease the removal of the snap-off screws.

Scheme 703

1. Guide nozzle - 1 - of heat gun onto locking mechanism thread so that the nozzle "encloses" the thread. Let nozzle make contact steadily on upper end of protective housing.
2. Switch on heat gun and heat thread for approx. 20 to 25 seconds.

Scheme 704

1. Then clamp bolt head - 2 - using locking pliers - 1 - and remove snap-off screw in direction of (- arrow -).

Procedure for the second snap-off screw is exactly the same. Be especially careful, because the control module connectors are located in the immediate vicinity.

Scheme 705

1. Guide nozzle - 1 - of heat gun onto locking mechanism thread again so that the nozzle "encloses" the thread. Let nozzle make contact steadily on upper end of protective housing.
2. Switch on heat gun and heat thread for approx. 20 to 25 seconds.

Scheme 706

1. Then clamp bolt head - 2 - using locking pliers - 1 - and remove snap-off screw in direction of - arrow -.

Now Engine Control Module (ECM) can be detached from protective housing.

1. Disengage connectors from Engine Control Module (ECM) and then disconnect the connectors.

Scheme 707

1. Connect test box VAG1598/31 to connector of wiring harness. Ground (GND) clip must be connected to Ground (GND). Relevant test procedures note whether Engine Control Module (ECM) should also be connected to the test box.
2. Perform test as described in relevant repair sequence.

Engine Control Module, Installing

Installation is performed in reverse order, ECM must always be installed with the protective housing. New snap-off screws must be used.

Perform the following work after re-connecting Engine Control Module (ECM)

1. Generate readiness code --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-generating) .

Note. In the first adaptation phase during engine basic setting, it is possible that idle will be rough and vehicle may shake lightly in drive mode.

Catalyst Monitoring K72 Warning Light, Meaning

The warning light for catalytic converter monitoring lights up when exhaust relevant malfunctions are recognized by the ECM or TCM. Signal is transferred via CAN-Bus.

Scheme 708

Component location of warning light for catalytic converter monitoring

Note. The warning light for catalytic converter monitoring can blink or remain lit continuously. DTC memory must be checked in each case --> Diagnostic Mode 03 - Read DTC Memory . Blinking: There is a malfunction that causes damage to the catalytic converter in this driving condition. In this case, vehicle must only be driven at reduced power! Continuously lit: There is a malfunction that causes increased emissions. Check DTC memory for Engine Control Module (ECM) and automatic transmission. DTC memory must still be checked if there are driveability problems or the customer has complained but the warning light for catalytic converter monitoring is not lit, because malfunctions can be stored without causing the warning light for catalytic converter monitoring to light immediately.

Malfunction Indicator Lamp, Function Test

1. Switch ignition on.

1. Catalytic converter monitoring warning lamp must go on

1. Start engine.

1. Shortly after starting engine, catalytic converter monitoring lamp goes out if there are no emissions-related malfunctions stored in the DTC memory.

Note. The switch-on signal for Malfunction Indicator Lamp (MIL) is transferred from Engine Control Module (ECM) or Transmission Control Module (TCM) to the instrument cluster via CAN-Bus. Check CAN bus terminal resistance --> Data Bus Terminal Resistance, Checking .

Diagnostic Mode, Selecting

> Address Word 33 - OBD

> Diagnostic Mode 01 - Read Current System Data

> Diagnostic Mode 02 - Read Operating Conditions

> Diagnostic Mode 03 - Read DTC Memory

> Diagnostic Mode 04 - Erase DTC Memory

> Diagnostic Mode 05 - Read Oxygen Sensor Monitoring Test Results

> Diagnostic Mode 06 - Read Test Results for Specific Diagnostic Functions

> Diagnostic Mode 07 - Read Faults Detected During the Current or Last Driving Cycle

> Diagnostic Mode 08 - Request Control of On-Board System, Test or Component

> Diagnostic Mode 09 - Read Vehicle Information

Special tools, testers and auxiliary items required

1. Vehicle Diagnostic and Information System VAS5052 with
2. Diagnostic cable VAS5052/3

Address Word 33 - OBD

Function

Via the diagnostic tester, different diagnostic modes can be selected under "address word 33 - On-Board Diagnostic (OBD)".

The following diagnostic modes monitor all components and systems which influence the emission quality.

Diagnostic Mode 01 - Read Current System Data

Diagnostic Mode 01 makes it possible to access current emissions-related measured values and diagnostic data. The original measured values (no replacement values), input and output data and system status information are displayed using Diagnostic Mode 1.

Prerequisite

1. Coolant temperature must be at least 80 C --> PID 5, Coolant temperature.

Procedure

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Depending on the desired operating condition: switch on ignition

or start engine and let run at idle.

1. Under address word 33, select "Diagnostic mode 1: Checking measured values."
2. Select the desired measured values "PID XX".

Note. The specified values for the respective measuring values can be found at the respective component- and function tests. The following list only serves as an overview. The measuring values are sorted according to the PID (parameter identifications). Bank 1 = Cylinder bank 1, in direction of travel, right Bank 2 = Cylinder bank 2, in direction of travel, left Measuring values of Engine Control Module (ECM) are displayed under "10 - Engine electronics" and measuring values of Transmission Control Module (TCM) are displayed under "1A - Transmission electronics".

*PIDs that are not relevant are not listed.

1. End diagnosis and switch ignition off.

Diagnostic Mode 02 - Read Operating Conditions

When an emissions-related fault (pending DTC, visible in mode 07) is first detected, operating conditions are stored. Mode 02 makes it possible to access this freeze frame data as soon as this fault is shown in mode 03. Each control module only shows freeze frame data for one fault via mode 02. Therefore, there are two priority levels. If there is a malfunction with higher priority, the freeze frame data is overwritten.

1. Fault with higher priority: Misfire malfunction or fuel trim malfunction.
2. Fault with normal priority: All other emissions-related faults.

Procedure

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Depending on the desired operating condition: switch on ignition

or start engine and let run at idle.

1. Under address word 33, select "Diagnostic mode 2: Check operating conditions."
2. Select desired operating condition "PID XX".

Note. The operating conditions are sorted by the PID (parameter-identifications). Bank 1 = Cylinder bank 1, in direction of travel, right Bank 2 = Cylinder bank 2, in direction of travel, left Measuring values of Engine Control Module (ECM) are displayed under "10 - Engine electronics" and measuring values of Transmission Control Module (TCM) are displayed under "1A - Transmission electronics".

*PIDs that are not relevant are not listed.

If DTCs are displayed in "PID 02"

1. Repair stored malfunctions according to DTC table

1. SAE P0xxx-DTCs --> «SAE P0xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)
2. SAE P1xxx-DTCs --> «SAE P1xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)
3. SAE P2xxx-DTCs --> «SAE P2xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__sae-p2xxx-diagnostic-trouble-codes)
4. SAE P3xxx-DTCs --> «SAE P3xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__sae-p3xxx-diagnostic-trouble-codes)

1. SAE U0xxx-DTCs --> «SAE U0xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__sae-u0xxx-diagnostic-trouble-codes)

1. End diagnosis and switch ignition off.

Diagnostic Mode 03 - Read DTC Memory

Diagnostic Mode 03 makes it possible to read emissions-related faults (confirmed DTCs: faults which have activated the MIL) in the ECM and in the TCM.

Warning light for catalytic converter monitoring (CAT) in instrument cluster lights up for one DTC entry.

Diagnostic Trouble Codes

The DTC always consists of a 5-digit alpha-numeric value with the following meaning

Component group

1. Pxxxx = DTC for drivetrain.

Norm-Code

1. P0xxx = DTCs defined by SAE with specified malfunction texts.
2. P1xxx = Additional emission relevant DTCs provided by manufacturer.
3. P2xxx = DTCs defined by SAE with specified malfunction texts.
4. P3xxx = Additional emission relevant DTCs provided by manufacturer.

System group

1. Px0xx = Fuel-air mixture and additional emission regulations
2. Px1xx = Fuel-air mixture.
3. Px2xx = Fuel-air mixture.
4. Px3xx = Ignition system.

1. Px4xx = Additional emission regulation.
2. Px5xx = Speed and idle control.
3. Px6xx = Control module and output signals.
4. Px7xx = Transmission.

1. Px8xx = Transmission.
2. Px9xx = Control modules, input and output signals.

Procedure

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Start engine and let run at idle.

Note. Only if engine does not start

1. Operate starter for approx. 6 seconds. Do not switch ignition off afterward.
2. Under address word 33, select "Diagnostic mode 3: Check DTC memory."

The number of stored malfunctions or "0 malfunctions detected" is displayed.

1. End diagnosis and switch ignition off.
2. Repair stored malfunctions according to DTC table

1. SAE P0xxx-DTCs --> «SAE P0xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)
2. SAE P1xxx-DTCs --> «SAE P1xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)
3. SAE P2xxx-DTCs --> «SAE P2xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__sae-p2xxx-diagnostic-trouble-codes)
4. SAE P3xxx-DTCs --> «SAE P3xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__sae-p3xxx-diagnostic-trouble-codes)

1. SAE U0xxx-DTCs --> «SAE U0xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__sae-u0xxx-diagnostic-trouble-codes)

Note. The DTC table is sorted by SAE code. "EPC" -relevant malfunctions are also indicated by the warning lamp for Electronic Power Control ("EPC warning lamp") in the instrument cluster. In addition, "emission" -relevant malfunctions are indicated in the instrument cluster via the warning light for catalytic converter monitoring (CAT). In Diagnostic mode 2, it can be determined at which operating condition a malfunction was detected and stored by the Engine Control Module (ECM) --> Diagnostic Mode 02 - Read Operating Conditions .

1. Erase DTC memory after repairing malfunction --> «Diagnostic Mode 04 - Erase DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-04-erase-dtc) .

Display Example

P0444 Evaporative Emission System Purge Control Valve Circuit Open

Explanation

1. P0444 = SAE diagnostic trouble code (malfunction identification number).
2. Evaporative Emission System Purge Control Valve = malfunctioning wiring path or malfunctioning component.
3. Circuit Open = Malfunction type as text

Diagnostic Mode 04 - Erase DTC Memory

Diagnostic Mode 04 makes it possible to erase the DTC memory and to reset all emissions-related diagnostic data. In that way, all faults in the DTC memory in the ECM and TCM are erased. The adaptation values may also be reset.

Emissions-related diagnostic data includes (as applicable)

1. MIL Status
2. Number of DTCs
3. Readiness Bits
4. Confirmed DTCs

1. Pending DTCs
2. DTC that belongs to freeze frame
3. Freeze frame data
4. Test results of specific diagnostic functions

1. Distance driven with MIL ON
2. Number of Warm-Up Cycles after erasing the DTC memory
3. Distance driven after erasing the DTC memory
4. Misfire counter

Prerequisite

1. DTC memory was erased --> «Diagnostic Mode 03 - Read DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-03-read-dtc) .

Procedure

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Start engine and let run at idle.
3. Under address word 33, select "Diagnostic mode 4: Reset/erase diagnostic data.

Will be erased

1. Number and content of the DTC memories
2. Operating conditions
3. Test results.

1. End diagnosis and switch ignition off.

Diagnostic Mode 05 - Read Oxygen Sensor Monitoring Test Results

Note. Mode 05 may not be supported on all systems. On systems where Diagnostic Mode 05 is not supported, refer to Diagnostic Mode 06 - Read Test Results for Specific Diagnostic Functions .

Function

The static values of the oxygen sensors are indicated via this diagnostic mode.

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

Prerequisite

1. Coolant temperature must be at least 80 C --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) .

Procedure

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Start engine and let run at idle.
3. Under address word 33, select "Diagnostic mode 5: Check output of oxygen sensor signals".
4. Select the desired output of oxygen sensor signals "Test-ID XX".

Scheme 709

1. Select desired output of oxygen sensor signals "Test-ID XX".

*) V = Voltage in Volts (oxygen sensor signal)

**) t = Time in seconds

Note. Bank 1 = Cylinder bank 1, in direction of travel, right Bank 2 = Cylinder bank 2, in direction of travel, left When selecting the diagnostic mode, the entry is always performed in "Bank 1 sensor 1".

1. End diagnosis and switch ignition off.

Evaluation test-ID 01: Rich to lean sensor barrier voltage

If specified value is not obtained

1. Replace respective oxygen sensor

1. Heated Oxygen Sensor (HO2S) G39 , bank 1 --> «Heated Oxygen Sensors before Catalytic Converter, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__heated-oxygen-sensors-before-catalytic-converter)
2. Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 , bank 2 --> «Oxygen Sensor after Catalytic Converter, Bank 1, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__oxygen-sensor-after-catalytic-converter-bank)
3. Heated Oxygen Sensor (HO2S) 2 G108 , bank 1 --> «Heated Oxygen Sensors before Catalytic Converter, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__heated-oxygen-sensors-before-catalytic-converter)
4. Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 , bank 2 --> «Oxygen Sensor 2 after Catalytic Converter, Bank 2, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__oxygen-sensor-2-after-catalytic-converter)

1. Erase DTC memory --> «Diagnostic Mode 04 - Erase DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-04-erase-dtc) .
2. Generate readiness code --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-generating) .

Evaluation test-ID 02: Lean to rich sensor barrier voltage

If specified value is not obtained

1. Replace respective oxygen sensor

1. Heated Oxygen Sensor (HO2S) G39 , bank 1 --> «Heated Oxygen Sensors before Catalytic Converter, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__heated-oxygen-sensors-before-catalytic-converter)
2. Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 , bank 2 --> «Oxygen Sensor after Catalytic Converter, Bank 1, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__oxygen-sensor-after-catalytic-converter-bank)
3. Heated Oxygen Sensor (HO2S) 2 G108 , bank 1 --> «Heated Oxygen Sensors before Catalytic Converter, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__heated-oxygen-sensors-before-catalytic-converter)
4. Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 , bank 2 --> «Oxygen Sensor 2 after Catalytic Converter, Bank 2, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__oxygen-sensor-2-after-catalytic-converter)

1. Erase DTC memory --> «Diagnostic Mode 04 - Erase DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-04-erase-dtc) .
2. Generate readiness code --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-generating) .

Evaluation test-ID 07: Minimum voltage at sensor for test cycle

If specified value is not reached

1. Short circuit to Ground (GND) or open circuit in wiring

1. Check oxygen sensor and oxygen sensor control

Bank 1 sensor 1 and Bank 2 sensor 1 --> Oxygen Sensor before Catalytic Converter, Checking Function before catalytic converter, checking

Bank 1 sensor 2 and Bank 2 sensor 2 --> Oxygen Sensor after Catalytic Converter, Checking Function

If specified value is exceeded

1. Oxygen sensor not ready for operation
2. Oxygen sensor heater faulty

1. Check oxygen sensor heater

Bank 1 sensor 1 and Bank 2 sensor 1 --> Heater for Oxygen Sensor before Catalytic Converter, Checking

Bank 1 sensor 2 and Bank 2 sensor 2 --> Heater for Oxygen Sensors after Catalytic Converter, Checking

1. Short circuit to B+ or open circuit in wiring

1. Check oxygen sensor and oxygen sensor control

Bank 1 sensor 1 and Bank 2 sensor 1 --> Oxygen Sensor before Catalytic Converter, Checking Function

Bank 1 sensor 2 and Bank 2 sensor 2 --> Oxygen Sensor after Catalytic Converter, Checking Function

Evaluation test-ID 08: Maximum voltage at sensor for test cycle

If specified value is not reached

1. Oxygen sensor not ready for operation
2. Oxygen sensor heater faulty

1. Check oxygen sensor heater

Bank 1 sensor 1 and Bank 2 sensor 1 --> Heater for Oxygen Sensor before Catalytic Converter, Checking

Bank 1 sensor 2 and Bank 2 sensor 2 --> Heater for Oxygen Sensors after Catalytic Converter, Checking

1. Short circuit to Ground (GND) or open circuit in wiring

1. Check oxygen sensor and oxygen sensor control

Bank 1 sensor 1 and Bank 2 sensor 1 --> Oxygen Sensor before Catalytic Converter, Checking Function before catalytic converter, checking

Bank 1 sensor 2 and Bank 2 sensor 2 --> Oxygen Sensor after Catalytic Converter, Checking Function

If specified value is exceeded

1. Short circuit to B+ or open circuit in wiring

1. Check oxygen sensor and oxygen sensor control

Bank 1 sensor 1 and Bank 2 sensor 1 --> Oxygen Sensor before Catalytic Converter, Checking Function before catalytic converter, checking

Bank 1 sensor 2 and Bank 2 sensor 2 --> Oxygen Sensor after Catalytic Converter, Checking Function

Test ID 129 - Current Oxygen Sensor Voltage Value, Evaluating

If specified value is not reached

1. Oxygen sensor not ready for operation
2. Oxygen sensor heater faulty

1. Check oxygen sensor heater

Bank 1 sensor 1 and Bank 2 sensor 1 --> Heater for Oxygen Sensor before Catalytic Converter, Checking before catalytic converter, checking

1. Short circuit to Ground (GND) or B+ or open circuit
2. Oxygen sensor faulty

1. Check oxygen sensor and oxygen sensor control

Bank 1 sensor 1 and Bank 2 sensor 1 --> Oxygen Sensor before Catalytic Converter, Checking Function before catalytic converter, checking

Test ID 130 - Specified Oxygen Sensor Voltage Value, Evaluating

If specified value is not reached

1. Replace engine control module.

Test ID 131 - Dynamic Value, Evaluating

If specified value is not reached

1. Oxygen sensor is aged

1. Replace the respective oxygen sensor

1. Bank 1, sensor 1 Heated Oxygen Sensor (HO2S) G39 --> «Heated Oxygen Sensors before Catalytic Converter, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__heated-oxygen-sensors-before-catalytic-converter)
2. Bank 2, sensor 1 Heated Oxygen Sensor (HO2S) 2 G108 --> «Heated Oxygen Sensors before Catalytic Converter, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__heated-oxygen-sensors-before-catalytic-converter)

Diagnostic Mode 06 - Read Test Results for Specific Diagnostic Functions

Diagnostic Mode 06 makes it possible to retrieve test results for special components and systems which are continuously or not continuously monitored. If the diagnosis of a system is complete, the diagnostic result and the corresponding thresholds are saved and displayed in mode 06. This data remains saved (even with the ignition off) until either new diagnostic results become available or the DTC memory is erased.

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

Test ID 01 - Catalytic Converter

Test Prerequisite

1. Coolant temperature must be at least 80 C --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 5, Coolant temperature.

Procedure

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Perform a 15 minute road test in the highest gear or in the highest driving mode on a level driving surface.

The following operating conditions must be met during this road test

1. Engine speed approx. 1800 to 2200 RPM --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 12, engine rotations per minute (RPM)
2. Vehicle speed constant 90 km/h --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 13, Vehicle speed

Observe safety precautions that apply to road tests --> Safety Precautions .

1. Let engine run at idle.
2. Under address word 33, select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
3. Select the "Test-ID 01: Catalytic converter" off.
4. Check specified values at idle.

Note. Bank 1 = Cylinder bank 1, in direction of travel, right Bank 2 = Cylinder bank 2, in direction of travel, left

1. End diagnosis and switch ignition off.

If specified values are exceeded

1. Replace respective exhaust pipe with catalytic converter --> «Exhaust System Components, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__exhaust-system-components-removing-and-installing) .

Test ID 03 - Secondary Air Injection System

Test Prerequisites

1. There must not be any DTCs stored in DTC memory --> «Diagnostic Mode 03 - Read DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-03-read-dtc) .

Let vehicle stand for approx. 12 hours with engine switched off under the following conditions

1. Intake air temperature 10 to 50 C --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 15: Intake Air Temperature (IAT)
2. Coolant temperature approx. intake air temperature (10 to 50 C) --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 5, Coolant temperature.

Procedure

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Start engine and let run at least 15 minutes at idle.
3. Under address word 33, select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
4. Select "Test-ID 03: Secondary Air Injection (AIR) system"

1. Check specified values at idle.

Note. Bank 1 = Cylinder bank 1, in direction of travel, right Bank 2 = Cylinder bank 2, in direction of travel, left

1. End diagnosis and switch ignition off.

If specified values are not reached

1. Check secondary air system for proper seal --> «Secondary Air Injection Combination Valve, Checking»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__secondary-air-injection-combination-valve-checking) .
2. Check Secondary Air Injection (AIR) Pump Motor V101 --> «Secondary Air Injection Pump Motor, Checking»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__secondary-air-injection-pump-motor-checking)

Test ID 05 - Tank Ventilation System

Test Prerequisites

1. Coolant temperature must be 80 to 110 C --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 5, Coolant temperature.
2. Throttle valve angle 12.0 to 16.0% --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 17: Throttle valve position (absolute)

Procedure

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Start engine and let run at least 15 minutes at idle.
3. Under address word 33, select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
4. Select "Test-ID 05: Tank ventilation system".

1. Check specified values at idle.

1. End diagnosis and switch ignition off.

If specified values are not reached

1. EVAP canister system, checking for proper seal --> «EVAP System Diagnostic Leak Test, Performing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__evap-system-diagnostic-leak-test-performing) .
2. Leak detection pump (LDP) V144 , checking --> «Leak Detection Pump, Checking»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__leak-detection-pump-checking) .

Test ID 09 - Engine Coolant Temperature Sensor G62

Test Prerequisite

1. There must not be any DTCs stored in DTC memory --> «Diagnostic Mode 03 - Read DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-03-read-dtc) .

Procedure

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Perform a road test until a coolant temperature of 80 to 100 C has been reached --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 5, Coolant temperature.
3. Switch ignition off.
4. Start engine at a coolant temperature of 80 to 90 C and let it run at idle.

1. Perform a 5 minute road test in the highest gear or in the highest driving mode on a level driving surface.

Observe safety precautions that apply to road tests --> Safety Precautions .

The following operating conditions must be met during this road test

1. Engine speed approx. 1800 to 2200 RPM --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 12, engine rotations per minute (RPM)
2. Vehicle speed constant 90 km/h --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 13, Vehicle speed

1. Let engine run at idle.
2. Under address word 33, select "Diagnostic mode 6: Check test results of components that are not continuously monitored".
3. Select "Test-ID 09: Engine Coolant Temperature (ECT) sensor".
4. Check specified value at idle.

Specified value: System OK

1. End diagnosis and switch ignition off.

If specified value is not obtained

1. Check Engine Coolant Temperature (ECT) Sensor G62 --> «Engine Coolant Temperature Sensor, Checking»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__engine-coolant-temperature-sensor-checking) .
2. Check coolant regulator: --> «19 - ENGINE - COOLING SYSTEM»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-engine-mechanical-engine-codes-bfm)

Diagnostic Mode 07 - Read Faults Detected During the Current or Last Driving Cycle

Mode 07 makes it possible to check emissions-related faults which appeared during the current or last driving cycle (pending DTCs).

A pending DTC is saved the first time a fault is detected (output via Mode 07).

1. If the fault is detected again by the end of the following driving cycle, a confirmed DTC is entered (output via Mode 03) and the MIL is activated.
2. If this malfunction is not detected again by the end of the following driving cycle, the corresponding pending code will be deleted at the end of the driving cycle.

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

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.

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

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

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

1. SAE P0xxx-DTCs --> «SAE P0xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)
2. SAE P1xxx-DTCs --> «SAE P1xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)
3. SAE P2xxx-DTCs --> «SAE P2xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__sae-p2xxx-diagnostic-trouble-codes)
4. SAE P3xxx-DTCs --> «SAE P3xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__sae-p3xxx-diagnostic-trouble-codes)

1. SAE U0xxx-DTCs --> «SAE U0xxx Diagnostic Trouble Codes»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__sae-u0xxx-diagnostic-trouble-codes)

1. Switch the ignition off.

Diagnostic Mode 08 - Request Control of On-Board System, Test or Component

Diagnostic Mode 08 is used to control the operation of an on-board system, test or component. A Mode 8 service can be used to turn on-board system ON or OFF, or to cycle an on-board system, test or component ON or OFF for a specific period of time. The service can also be used to request system status or to report test results.

Diagnostic Mode 08, TID $01

Diagnostic Mode 08, TID $01 is used to determine if the evaporative system may be leaking.

Note. The Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 - and Leak detection pump (LDP) V144 seal the tank system.

Test Prerequisites

1. Coolant temperature must be 80 to 110 C --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 5, Coolant temperature.
2. Intake air temperature must not be above the maximum of 60 C --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 15, Intake air temperature.
3. Throttle valve angle 12.0 to 16.0% --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 17: Throttle valve position (absolute)

Function Test

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Start engine and let run at least 15 minutes at idle.
3. Under address word 33, select "Diagnostic mode 8: Tank leak test".
4. Measuring value "Test-ID 01: select Tank leak test".

1. Check specified value of tank leak test at idle.

Note. The function test can take a few minutes. If the accelerator pedal is depressed during the test, the test will be aborted. To repeat the tank leak test, switch ignition off and start engine again and let run 15 minutes at idle.

If specified value is obtained

1. End diagnosis and switch ignition off.

If specified value is not obtained

1. EVAP canister system, checking for proper seal --> «EVAP System Diagnostic Leak Test, Performing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__evap-system-diagnostic-leak-test-performing) .
2. Leak detection pump (LDP) V144 , checking --> «Leak Detection Pump, Checking»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__leak-detection-pump-checking) .

Diagnostic Mode 09 - Read Vehicle Information

Diagnostic Mode 09 makes it possible to access vehicle-specific information from the ECM and the TCM (where applicable).

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

Prerequisite

1. There must not be any DTCs stored in DTC memory --> «Diagnostic Mode 03 - Read DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-03-read-dtc) .

Procedure

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Switch ignition on.
3. Under address word 33, select "Diagnostic mode 9: vehicle information".
4. If necessary, select desired vehicle information "Test-ID XX".

Vehicle Information, Displaying

1. End diagnosis and switch ignition off.

Readiness Code

> Readiness Code, Reading

> Readiness Code, Generating

Readiness Code, Reading

Function

The readiness code is an 8 digit number block that indicates the results of an exhaust related On Board Diagnostic (OBD).

If a diagnostic for a system has run through successfully, the respective digit of the number block is set from 1 to 0.

On Board Diagnostics are performed at regular intervals during normal vehicle operation. After repairing an exhaust relevant system, the readiness code should be generated via a road test to ensure that these systems are working according to specifications. If a malfunction is recognized during diagnostic, it is stored in DTC memory.

The readiness code is erased every time DTC memory is erased or when voltage supply is interrupted. DTC memory should therefore only be erased when there are DTCs stored.

Prerequisites

1. There must not be any DTCs stored in DTC memory --> «Diagnostic Mode 03 - Read DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-03-read-dtc) .
2. Coolant temperature must be at least 80 C --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 5, Coolant temperature.

Procedure

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Start engine and let run at idle.
3. Under address word 33, select "Diagnostic mode 1: Checking measured values."
4. Select desired measuring value "PID 01".

1. Observe right 8-digit number block

If all diagnostics have run through successfully, the following specified value 8-digit number block must appear.

1. Specified value: displaying 00000000.

Evaluation PID 01: System status-information (right 8-digit number block:)

If a 1 is displayed instead of a 0 in the 8-digit number block

1. Generate readiness code --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-generating) .

Readiness Code, Generating

Prerequisites

1. The respective fuses of the Motronic fuel injection and ignition system must be OK: --> Electrical Wiring Diagrams, Troubleshooting and Component Locations
2. Battery voltage must be at least 12.5 volts.
3. All electrical consumers such as, lights and rear window defroster must be switched off.
4. If vehicle is equipped with an A/C system, it must be switched off.

1. Ground (GND) connections between engine and chassis must be OK.
2. There must not be any DTCs stored in DTC memory --> «Diagnostic Mode 03 - Read DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-03-read-dtc) .

Let vehicle cool off with the ignition switched off until the following conditions are met

1. Intake air temperature 10 to 50 C --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 15
2. Coolant temperature approx. intake air temperature (10 to 50 C) --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 5

Procedure

1. Connect diagnostic tester --> «Diagnostic Tester, Connecting»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-tester-connecting) .
2. Start engine and let run at idle for at least 15 minutes.

Observe safety precautions that apply to road tests --> Safety Precautions .

1. Perform a 15 minute road test in the highest gear or in the highest driving mode on a level driving surface.

1. Engine speed approx. 1800 to 2200 RPM --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 12, engine rotations per minute (RPM)
2. Vehicle speed constant 90 km/h --> «Diagnostic Mode 01 - Read Current System Data»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-01-read-current) ; PID 13, Vehicle speed

1. Do not switch off engine and let run at idle for at least 3 minutes.

Secondary Air Injection (AIR) system will be checked during this idle phase.

1. Switch off engine for at least 30 minutes so that coolant temperature can drop to about a minimum of 10 C.
2. Start engine and let run at least 2 minutes at idle.

Engine coolant temperature sensor will be checked during this idle phase.

Observe the safety precautions that apply to road tests --> Safety Precautions .

1. Read readiness code --> «Readiness Code, Reading»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-reading) .

DTC Table

> SAE P0xxx Diagnostic Trouble Codes

> SAE P1xxx Diagnostic Trouble Codes

> SAE P2xxx Diagnostic Trouble Codes

> SAE P3xxx Diagnostic Trouble Codes

> SAE U0xxx Diagnostic Trouble Codes

Note. The column "Cat" in the DTC overview indicates the switch-on condition for the warning light.

1. Dcy = Driving cycle

1. Erase DTC memory after repairing malfunction --> «Diagnostic Mode 04 - Erase DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-04-erase-dtc) and generate the readiness code again --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-generating)
2. If a malfunction only occurs occasionally, or if DTC memory is not erased after a malfunction has been repaired, the malfunction will be shown as "sporadic malfunction" with "SP" on the display.
3. If the malfunction no longer appears within the next 40 warm-up cycles, this sporadic malfunction will be erased automatically.
4. Warning light for catalytic converter monitoring does not switch on immediately for some malfunction types, but rather only after two consecutive Driving cycles (Dcy).

1. If the warning light lights up with engine running, there is a malfunction that causes increased emissions. If warning light is lit and engine is running, a DTC must definitely be stored in DTC memory of Engine Control Module (ECM) or of Transmission Control Module (TCM). In this case, DTC memory of Engine Control Module (ECM) or of Transmission Control Module (TCM) must be checked.
2. If warning light begins to blink, there is a malfunction (e.g. combustion misfires with a high rate of misfire) that can lead to damage to the catalytic converter. In this case, drive must be continued at reduced load performance (until the warning light goes out or remains constantly lit) and malfunction must be eliminated as quickly as possible.
3. If malfunctioning components are detected, check also wires to the component for short circuit and open circuit according to wiring diagram.
4. Before repairing malfunctions or replacing components, check wires and harness connectors to these components as well as Ground (GND) connections according to wiring diagram. This is particularly valid when malfunctions are displayed as "sporadically occurring (SP)".

Fuel and air mixture and additional emission regulations

Transmission

Fuel and air metering and auxiliary emission controls

Ignition system

Note. For malfunctions potentially caused by insufficient fuel (e.g. combustion misfires) the DTC "P1250, Fuel Level Too Low" is also indicated. This means that combustion misfires could not be recognized on account of a technical malfunction, but rather because there is/was too little fuel in fuel tank.

Voltage supply

CAN-Bus

Control module and auxiliary outputs

SAE P2xxx Diagnostic Trouble Codes

SAE P3xxx Diagnostic Trouble Codes

SAE U0xxx Diagnostic Trouble Codes

Control module and output signals

Fuel Supply System, Repair Information

> Fuel Supply System, Safety Precautions

> Clean Working Conditions

> Contact Corrosion

> Fuel System, Checking for Leaks

Fuel Supply System, Safety Precautions

The following steps should be taken before beginning work on the fuel supply

1. Disconnect battery Ground (GND) strap with the ignition switched off.
2. Open fuel filler cap briefly and then close again.

When removing and installing components from full or partially full fuel tanks, the following must be observed

1. The fuel tank may only be partially full. How much fuel can remain in the fuel tank may be read in the respective work description. Empty fuel tank if necessary --> «Fuel Tank, Emptying»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-tank-emptying) .
2. Before starting work, switch on exhaust extraction system and place an extraction hose close to the installation opening of 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 skin! Wear fuel-resistant gloves!

Note the following when removing and installing fuel tank

1. Fuel tank must be empty for weight reasons. Empty fuel tank if necessary --> «Fuel Tank, Emptying»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-tank-emptying) .

Clean Working Conditions

When working on the fuel supply/injection system, pay careful attention to the following points

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. Use lint-free cloths only!
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 loose (in tool boxes etc.)

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

Contact Corrosion

Contact corrosion can occur if inappropriate connecting elements (bolts, nuts, washers...) are used.

For this reason, only connecting elements with a special surface coating are installed. These elements are distinguished by their greenish hue.

Furthermore, all rubber, plastic and adhesive materials used are non-conductive.

If you have doubts about the reusability of parts, it is generally better to install new parts.

Fuel System, Checking for Leaks

1. Start engine and let it run a few minutes at average RPM.

Note. At the beginning, engine may run roughly due to air in fuel supply system.

1. Turn engine off and check fuel system for leaks.
2. Check DTC memory and, if necessary, erase.
3. Perform a road test with at least one acceleration at Wide Open Throttle (WOT).
4. After road test, check fuel system again for leaks.

1. Check DTC memory again and, if necessary, erase.

Fuel Supply

> Fuel Tank with Attachments, Component Overview

> Fuel Tank, Emptying

> Fuel Tank with Attachments, Removing and Installing

> Fuel Line Routing, Tank Interior, Overview

> Left Fuel Delivery Unit with Transfer Fuel Pump, Fuel Level Sensors 1 and 3, Component Overview

> Left Fuel Delivery Unit with Transfer Fuel Pump, Electrical Testing

> Left Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing

> Right Fuel Delivery Unit with Transfer Fuel Pump, Fuel Level Sensors 2 and 4, Component Overview

> Right Fuel Delivery Unit with Transfer Fuel Pump, Electrical Testing

> Right Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing

> Suction Jet Pumps, Function

> Left Suction Jet Pump, Removing and Installing

> Right Suction Jet Pump, Removing and Installing

Note. Secure all hose connections using hose clamps appropriate for the model type Always replace seals and gaskets.

Fuel Tank with Attachments, Component Overview

Scheme 710

1 - Securing strap

1. With spacer, installation position --> «Spacer installation position»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

2 - 22 Nm

3 - Fuel supply line

1. From fuel filter
2. To fuel rail line
3. To disconnect, press release button on connection piece

4 - Fuel return line

1. On vehicles with return line from engine
2. On vehicles with fuel system without return line from fuel filter
3. To disconnect, press release button on connection piece
4. Clipped in on fuel tank

5 - Vent line

6 - Ground (GND) connection

1. For discharging electrostatic charge
2. Installation position/test procedure --> «Installation position of Ground (GND) connection»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)
3. Make sure connector is seated properly
4. After installing, check electrical connection of fuel filler tube to a blank portion of chassis using Ohm meter Specified value: approx. 0 ohms

7 - Cap

8 - Seal

1. Replace if damaged

9 - 22 Nm

10 - Electrical harness connector

1. For fuel tank lock switch

11 - Vent line

1. To EVAP canister at bottom in spare wheel well at vehicle floor
2. Remains on fuel tank when fuel tank is removed

12 - Fuel tank

1. Removing and installing --> «Fuel Tank with Attachments, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-tank-with-attachments-removing-and)

13 - Socket

14 - Bracket

1. for fuel tank

15 - 22 Nm

16 - Rubber buffer

17 - Washer

18 - 22 Nm

19 - 22 Nm

20 - Securing strap

1. With spacer, installation position --> «Spacer installation position»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

21 - Retaining clip

1. For heat shield

22 - Heat shield

23 - Retaining clip

1. For heat shield

Scheme 711

1. Route Ground (GND) connection as shown in figure.
2. Ensure connector of Ground (GND) connection fits securely at metal ring of fuel filler tube (- arrow -).

Scheme 712

1. Make sure that spacers of tensions straps are seated directly under fuel tank seam (- arrow -).

Fuel Tank, Emptying

Special tools, testers and auxiliary items required

Scheme 713

1. VAS5190

Scheme 714

1. Wrench 3087 for tank sensor

Work Procedure

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

1. Open fuel filler cap briefly and then close again.

1. Disconnect battery Ground (GND) strap with the ignition switched off.
2. Remove luggage compartment floor lining.

Scheme 715

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

Scheme 716

1. Carefully release and disconnect electrical harness connectors - 1 - and - 2 - on left connector flange.

Scheme 717

1. Use wrench 3087 to remove locking ring.

Scheme 718

1. Remove cover for right connector flange (- arrows -).

Scheme 719

1. Carefully release and disconnect electrical harness connectors - 1 - and - 2 - on right connector flange.

Scheme 720

1. Mark and disconnect fuel supply line - 1 - and fuel return line - 2 - (press release tab).

Scheme 721

1. Use wrench 3087 to remove locking ring.

Scheme 722

1. Remove right side trim cover in luggage compartment (- arrows -).
2. Connect Ground (GND) wire of fuel extraction unit VAS5190 to GND pin of Energy Management Control Module J644.
3. Remove left connector flange and set it aside with electrical wires connected.
4. Remove sealing ring.

Scheme 723

1. Using fuel extraction unit VAS5190 , extract fuel in left fuel tank chamber through opening in fuel tank.
2. Remove right connector flange and set it aside with electrical wires and fuel lines connected.
3. Remove sealing ring.

Scheme 724

1. Using fuel extraction unit VAS5190 , extract fuel in right fuel tank chamber through opening in fuel tank.
2. Re-install left and right connector flange --> «Left Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__left-fuel-delivery-unit-with-transfer) and --> «Right Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__right-fuel-delivery-unit-with-transfer) .

Fuel Tank with Attachments, Removing and Installing

Special tools, testers and auxiliary items required

Scheme 725

1. Engine/transmission jack VAG1383A

Scheme 726

1. Mount T10031

Removing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

1. For removal, fuel tank must be empty for weight reasons. Empty fuel tank if necessary. Procedure --> «Fuel Tank, Emptying»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-tank-emptying) .

1. Release fuel filler flap.

1. Disconnect battery Ground (GND) strap with the ignition switched off.
2. Remove luggage compartment floor lining.

1. Remove cover for right connector flange (- arrows -).

Scheme 727

1. Disconnect ventilation line (- arrow -), to do so press release mechanisms and disconnect.

1. Removing rear axle: --> «42 - REAR SUSPENSION»(/audi/a8/d3-2005-2007/remont/axle-shafts/#suspension-wheels-and-steering)
2. Rear right wheel housing liner, removing: --> «66 - EXTERIOR EQUIPMENT»(/audi/a8/d3-2005-2007/remont/door-locks-anti-theft-systems/#body-exterior)

Scheme 728

1. Disconnect Ground (GND) wire - 3 - from fuel filler tube.
2. Disconnect electrical harness connector - 1 - for Fuel Tank Lock Switch F314
3. Disconnect ventilation line - 5 - from fuel filler tube.
4. Remove bolts - 2 - and - 4 - for fuel filler tube.

Scheme 729

1. Check whether driveshaft has been secured against falling down.

Driveshaft must be supported on a wood block - 1 - and secured with wire or cable tie (- arrow -).

Make sure that driveshaft is tilted downward slightly so that fuel tank can later be guided over it.

Note. The maximum permissible bending angle on driveshaft must not exceed 8.

Scheme 730

1. Remove heat shield for driveshaft - arrows -.

Note. Heat shield is also clipped in on ventilation line at top.

Scheme 731

1. Remove cover - 1 - , left, bottom at vehicle floor.

Scheme 732

1. Remove cover - 1 - , right, bottom at vehicle floor.

Scheme 733

1. Disconnect electrical harness connectors

2 - to fuel pumps

3 - to fuel level sensors

1. Disconnect fuel lines (press release buttons)

1 - Fuel return line

4 - Fuel supply line

Scheme 734

1. Disconnect rear right ventilation line (- arrow -) from fuel tank (press release button).

Scheme 735

1. Hang brake calipers, previously hung on fuel tank retainers, of removed rear axle on suspension struts using wire (- arrow -).

Scheme 736

1. Place VAG1383A engine/transmission jack with T10031 mount (without threaded rods) under fuel tank to support.
2. Support fuel tank using VAG1383A and T10031 mount.
3. In addition, a second mechanic must support fuel tank at rear edge by hand.

Scheme 737

1. Remove bolts - 1 - to - 6 - , if necessary swivel retainer for fuel tank toward front.
2. Lower fuel tank slightly at rear so that filler tube can be guided out from body.
3. Then lower fuel tank using engine/transmission support VAG1383A , in addition guide fuel tank by hand while doing so.

Note. Fuel tank is depicted without engine/transmission jack VAG1383A in the illustration.

Installing

Note. Secure all hose connections using hose clamps appropriate for the model type

Scheme 738

1. Check whether fuel supply and fuel return lines, as well as wiring harness to fuel pumps and fuel level sensors are clipped in on fuel tank at retainers - 1 -.
2. When installing a new fuel tank, affix pads - 2 - onto fuel tank as shown in illustration.
3. Position fuel tank with tension straps and retainers to vehicle floor using engine/transmission jack VAG1383A and mount T10031.
4. When positioning the fuel tank, make sure that the filler tube is guided correctly into opening on body.

1. Tighten fuel tank first at mounting points - 1 - , - 2 - , - 5 - , - 6 - and then at mounting points - 3 - and - 4 - (22 Nm).

1. Make sure that spacers of tensions straps are seated directly under fuel tank seam (- arrow -).

1. Tighten fuel filler tube with bolts - 2 - and - 4 - (22 Nm).
2. Connect ventilation line - 5 - until it engages audibly.
3. Connect electrical harness connector - 1 - for Fuel Tank Lock Switch F314.
4. Check whether Ground (GND) wire - 3 - and connector tab show traces of oxidation. Remove them if necessary.

Rest of installation is performed in the reverse order of removal.

1. Install rear axle: --> «42 - REAR SUSPENSION»(/audi/a8/d3-2005-2007/remont/axle-shafts/#suspension-wheels-and-steering)
2. Install rear right wheelhousing liner. --> «66 - EXTERIOR EQUIPMENT»(/audi/a8/d3-2005-2007/remont/door-locks-anti-theft-systems/#body-exterior)
3. Install rear part of exhaust system: --> «26 - EXHAUST SYSTEM, EMISSION CONTROLS»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-engine-mechanical-engine-codes-bfm)
4. Connect battery. Observe safety precautions after connecting the battery. --> «27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL»(/audi/a8/d3-2005-2007/remont/cruise-control-systems/#electrical-equipment)

Tightening Specifications

Fuel Line Routing, Tank Interior, Overview

Note. (Scheme 739) shows an idealized depiction of line routing in fuel tank interior. With the exception of the line position depicted in --> Installation position of fuel delivery lines, an exact line routing is not necessary, however make sure that components have clearance to each other in general and rattling noises are prevented. (- Arrow -) points in direction of travel.

Scheme 739

1 - Left fuel delivery unit with Transfer Fuel Pump (FP) G6

2 - Fuel delivery line

1. From left suction jet pump to right fuel delivery unit

3 - Suction jet pipe

1. From right Fuel Pump (FP) to left suction jet pump

4 - Left suction jet pump

5 - Expansion tank

1. With suction jet pump to pump fuel out of expansion tank

6 - Non-return valve

1. For fuel filling line

7 - Initial fuel filling line

1. To right fuel delivery unit
2. Serves upon first filling to route a small filling quantity immediately to the fuel delivery unit

8 - Right suction jet pump

9 - Suction jet pipe

1. From right Fuel Pump (FP) to right suction jet pump

10 - Fuel delivery line

1. From right suction jet pump to left fuel delivery unit

11 - Right fuel delivery unit with Fuel Pump (FP) G23

12 - Vent line

1. To bleeder connection at top on fuel filler tube

13 - Fuel supply line

1. From left and right Fuel Pumps (FP) to connector flange

14 - Vent line

1. To EVAP canister at bottom in spare wheel well at vehicle floor

15 - Fuel filling line

1. From filler tube to non-return valve in fuel tank

16 - Fuel return line

1. From connector flange to left and right fuel delivery units

17 - Suction jet pipe

1. To suction jet pump in expansion tank

Scheme 740

Delivery lines - 1 - and - 3 - must be routed under fuel filling line - 2 - in area of left fuel tank opening.

Scheme 741

1 - Mount

1. For fuel delivery unit

2 - Fuel Level Sensor G

1. Black
2. Checking resistance values --> «Fuel Level Sensor»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-level-sensor)
3. Removing and installing --> «Fuel Level Sensor 1, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-level-sensor-1-removing-and)

3 - Left fuel delivery unit

1. With Transfer Fuel Pump (FP) G6
2. Various versions, allocation
3. Fuel Pump (FP) electrical testing --> «Left Fuel Delivery Unit with Transfer Fuel Pump, Electrical Testing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)
4. Checking residual pressure: --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-fuel-injection-ignition-engine-codes-bfm)

1. Removing and installing --> «Left Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__left-fuel-delivery-unit-with-transfer)

4 - Fuel delivery line

1. From suction jet pump, right side

5 - Fuel supply line

1. Connector coupling is located on right side of fuel tank
2. To disconnect, press release button on connection piece

6 - Fuel return line

1. Connector coupling is located on right side of fuel tank
2. To disconnect, press release button on connection piece

7 - Locking ring

1. Use ring nut spanner 3087 to remove and install
2. Tighten to 120 Nm

8 - Left connector flange

1. Installation position --> «Installation position of left connector flange»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

9 - Seal

1. Always replace
2. To install, place into opening of fuel tank when dry

10 - Fuel Level Sensor 3 G237

1. Gray
2. Checking resistance values --> «Fuel Level Sensor 3, Checking»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-level-sensor-3-checking)
3. Removing and installing --> «Fuel Level Sensor 3, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-level-sensor-3-removing-and)

Scheme 742

1. Insert new, dry seal for connector flange into opening of fuel tank.
2. Insert connector flange in fuel tank, note installation position

The tab - 2 - on connector flange must lie between tabs - 1 - and - 3 - on fuel tank.

Scheme 743

Special tools, testers and auxiliary items required

1. VAG1348/3A with VAG1348/3-2
2. VAG1526A
3. VAG1594A
4. VAS5051 with VAS5051/9

Test Prerequisites

1. Battery voltage at least 12.7 V

1. Up to model year XXX: Fuse 10 on fuse holder SF10 (relay- and fuse holder, in luggage compartment, right side) OK
2. From model year 2004: Fuse 2 on fuse holder SF2 (relay- and fuse holder, in luggage compartment, right side) OK
3. Fuel Pump (FP) 2 Relay J49 OK (in relay- and fuse holder, in luggage compartment, right side, position 3)
4. Fuel filter OK

1. Ignition switched off.

Voltage Supply, Checking

1. Remove right side trim cover in luggage compartment (- arrows -).
2. Up to model year XXX remove Fuse 10 on fuse holder SF10, as of model year 2004 remove Fuse 2 on fuse holder SF2 (in relay- and fuse holder, in luggage compartment, right side)

Scheme 744

1. Connect remote control VAG1348/3A with adapter cable VAG1348/3-2 to right terminal of socket for Fuse 10 on fuse holder SF10-/Fuse 2 on fuse holder SF2(in relay- and fuse holder, in luggage compartment, right side).
2. Connect alligator clip to vehicle battery B+.
3. Press switch of remote control.

Operating noise of the pump must be audible in vicinity of fuel tank.

Note. Fuel Pump (FP) runs quietly. During test of Fuel Pump (FP), surrounding noise must be avoided; if necessary, use a second technician to check.

If no flowing noise can be heard

1. Remove luggage compartment floor lining.

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

1. Carefully release and disconnect electrical harness connector - 2 - on left connector flange.

Note. Disregard - 1 -.

Scheme 745

1. Connect multimeter between terminal 1 and 4 of harness connector for voltage measurement.
2. Press switch of remote control.

Specified value: approx. battery voltage

If specified value is not obtained

1. Check fuse (in relay- and fuse holder, in luggage compartment, right side) according to wiring diagram or repair open circuit in wiring according to wiring diagram. --> Electrical Wiring Diagrams, Troubleshooting and Component Locations

If specified value is obtained, although no operating noise can be heard from pump

1. Remove left fuel delivery unit --> «Left Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__left-fuel-delivery-unit-with-transfer) .

Scheme 746

1. Check whether electrical wires between flange and Fuel Pump (FP) are connected, and test for continuity if necessary.

If no malfunctions are found in wires

1. Fuel pump faulty. Replace left fuel delivery unit --> «Left Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__left-fuel-delivery-unit-with-transfer) .
2. Install left fuel delivery unit --> «Left Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__left-fuel-delivery-unit-with-transfer) .

Current Draw, Checking

Test Prerequisite

1. Voltage supply of Fuel Pump (FP) OK --> «Right Fuel Delivery Unit with Transfer Fuel Pump, Electrical Testing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__right-fuel-delivery-unit-with-transfer) .

1. Up to model year XXX remove Fuse 10 on fuse holder SF10, as of model year 2004 remove Fuse 2 on fuse holder SF2 (in relay- and fuse holder, in luggage compartment, right side)

1. Connect remote control VAG1348/3A with adapter cable VAG1348/3-2 to right terminal of socket for Fuse 10 on fuse holder SF10-/Fuse 2 on fuse holder SF2 (in relay- and fuse holder, in luggage compartment, right side).
2. Connect alligator clip to vehicle battery B+.
3. Connect VAS5051 tester with VAS5051/9 inductive pick-up to wire of remote control.
4. Press switch on remote control.

1. Measure Fuel Pump (FP) current draw.

Specified value: approx. 8 amps

If specified value is not obtained

Note. At a displayed current draw of 4 amps, Fuel Pump (FP) runs dry.

Left Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing

Special tools, testers and auxiliary items required

1. Wrench 3087 for tank sensor

Removing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

1. To remove the fuel delivery unit, the fuel tank may only be filled to a maximum of 1/3. Empty fuel tank if necessary. Procedure --> «Fuel Tank, Emptying»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-tank-emptying) .

1. Disconnect battery Ground (GND) strap with the ignition switched off.
2. Remove luggage compartment floor lining.

Note. To remove and install fuel delivery unit, it is advantageous to remove vehicle tools and spare wheel from luggage compartment. It is then possible to sit or kneel in spare wheel well.

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

1. Carefully release and disconnect electrical harness connectors - 1 - and - 2 - on left connector flange.

1. Use wrench 3087 to remove locking ring.
2. Disconnect connector flange and remove sealing ring.

Scheme 747

1. Disconnect electrical harness connectors -1 to - 3 - on underside of left connector flange.

1. Remove cover for right connector flange (- arrows -).

1. Carefully release and disconnect electrical harness connectors - 1 - and - 2 - on right connector flange.

1. Mark and disconnect fuel supply line - 1 - and fuel return line - 2 - (press release tab).

1. Use wrench 3087 to remove locking ring.
2. Disconnect connector flange and remove sealing ring.

Scheme 748

1. Disconnect electrical harness connectors -1 to - 3 - on underside of right connector flange.

Note. To disconnect the line couplings indicated in the description which follows, pull fuel lines toward opening of fuel tank. Many components in the following illustration are depicted as removed.

Scheme 749

1. Disconnect fuel lines - 1 - and - 2 - to left fuel delivery unit through the right opening of fuel tank, press release button to do so.

3 - Right fuel delivery unit with Transfer Fuel Pump (FP) G23

1. After disconnecting, pull both fuel lines out of left opening of fuel tank.

Scheme 750

1. Press release buttons (- arrows -) through left fuel tank opening and disconnect delivery line - 2 - as well as Fuel Supply Sensor 3 G237 (- 1 -).
2. Swing Fuel Supply Sensor 3 G237 to the side toward left.

Scheme 751

1. Press down both clips at mount for fuel delivery unit (- arrows -).
2. Remove fuel delivery unit.

Installing

Scheme 752

1. Before installing fuel delivery unit, pull both clips upward on mount until they engage (- arrows -).
2. Carefully press fuel delivery unit into mount until it engages audibly.

1. Connect delivery line - 2 - and Fuel Supply Sensor 3 G237 (- 1 -) until they engage audibly.
2. Push through supply and return line of left fuel delivery unit through to right fuel tank chamber.

1. Insert fuel lines - 1 - and - 2 - through right opening in fuel tank until they engage audibly.

3 - Right fuel delivery unit with Transfer Fuel Pump (FP) G23

1. Connect electrical harness connectors - 1 - to - 3 - on underside of right connector flange.
2. Insert new, dry seal for connector flange into opening of fuel tank.
3. Insert right connector flange in fuel tank, note installation position

Scheme 753

The tab - 2 - on connector flange must lie between tabs - 1 - and - 3 - on fuel tank.

1. Tighten locking ring (120 Nm).

1. Connect fuel supply line - 1 - and fuel return line - 2 - until they engage audibly.

1. Connect electrical harness connectors - 1 - and - 2 - to right connector flange.

1. Tighten cover for right connector flange (- arrows -).

1. Connect electrical harness connectors - 1 - to - 3 - on underside of left connector flange.
2. Insert new, dry seal for connector flange into opening of fuel tank.
3. Insert left connector flange in fuel tank, note installation position

The tab - 2 - on connector flange must lie between tabs - 1 - and - 3 - on fuel tank.

1. Tighten locking ring (120 Nm).

1. Connect electrical harness connectors - 1 - and - 2 - to left connector flange.

1. Tighten cover for left connector flange (- arrows -).
2. Connect battery. Observe safety precautions after connecting the battery. --> «27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL»(/audi/a8/d3-2005-2007/remont/cruise-control-systems/#electrical-equipment)

Tightening Specifications

Scheme 754

1 - Mount

1. For fuel delivery unit

2 - Fuel Level Sensor 2 G169

1. Yellow
2. Checking resistance values --> «Fuel Level Sensor 2, Checking»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-level-sensor-2-checking)
3. Removing and installing --> «Fuel Level Sensor 2, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-level-sensor-2-removing-and)

3 - Fuel Level Sensor 4 G393

1. White
2. Checking resistance values --> «Fuel Level Sensor 4, Checking»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-level-sensor-4-checking)
3. Removing and installing --> «Fuel Level Sensor 4, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-level-sensor-4-removing-and)

4 - Fuel supply line

1. To fuel filter
2. Mark before removing
3. To disconnect, press release button on connection piece
4. Do not bend

1. Clipped in on fuel tank

5 - Fuel return line

1. From fuel rail pipe
2. Mark before removing
3. To disconnect, press release button on connection piece
4. Do not bend

1. Clipped in on fuel tank

6 - Locking ring

1. Use ring nut spanner 3087 to remove and install
2. Tighten to 120 Nm

7 - Seal

1. Always replace
2. To install, place into opening of fuel tank when dry

8 - Right connector flange

1. Installation position --> «Installation position of right connector flange»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__installation-position-of-right-connector-flange)

9 - Fuel return line

1. To left fuel delivery unit

10 - Fuel supply line

1. From left fuel delivery unit
2. To disconnect, press release button on connection piece

11 - Suction jet pipe

1. For suction jet pump
2. To disconnect, press release button on connection piece

12 - Fuel delivery line

1. From suction jet pump, left side

13 - Fuel filler tube

1. From fuel filler tube

14 - Right fuel delivery unit

1. With Transfer Fuel Pump (FP) G23
2. Various versions, allocation
3. Fuel Pump (FP) electrical testing --> «Right Fuel Delivery Unit with Transfer Fuel Pump, Electrical Testing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__right-fuel-delivery-unit-with-transfer)
4. Checking residual pressure: --> «24 MULTIPORT FUEL INJECTION (MFI)»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-fuel-injection-ignition-engine-codes-bfm)

1. Removing and installing --> «Right Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__right-fuel-delivery-unit-with-transfer)

Installation position of right connector flange

1. Insert new, dry seal for connector flange into opening of fuel tank.
2. Insert connector flange in fuel tank, note installation position

The tab - 2 - on connector flange must lie between tabs - 1 - and - 3 - on fuel tank.

Right Fuel Delivery Unit with Transfer Fuel Pump, Electrical Testing

Special tools, testers and auxiliary items required

1. VAG1348/3A with VAG1348/3-2
2. VAG1526A
3. VAG1594A
4. VAS5051 with VAS5051/9

Test Prerequisites

1. Battery voltage at least 12.7 volts
2. Fuse 31 (in fuse holder) SC31 (in fuse holder, right side of instrument panel) OK.

Scheme 755

1. Fuel Pump (FP) Relay J17 OK (on relay- and fuse holder in front right footwell, position 4).
2. Fuel filter OK
3. Ignition switched off.

Scheme 756

1. Pry off right cover on instrument panel (- arrow -) using screwdriver.
2. Pull out Fuse 31 (in fuse holder) SC31 (in relay- and fuse holder in front right footwell, position 31).

Scheme 757

1. Connect remote control VAG1348/3A with adapter cable VAG1348/3-2 to left/right terminal of socket for Fuse 31 (in fuse holder) SC31 (in fuse holder, right side of instrument panel).
2. Connect alligator clip to vehicle battery B+.
3. Press switch of remote control.

Operating noise of the pump must be audible in vicinity of fuel tank.

Note. Fuel Pump (FP) runs quietly. During test of Fuel Pump (FP), surrounding noise must be avoided; if necessary, use a second technician to check.

If no flowing noise can be heard

1. Remove luggage compartment floor lining.

1. Remove cover for right connector flange (- arrows -).

1. Carefully release and disconnect electrical harness connector - 2 - on right connector flange.

Note. Disregard - 1 -.

1. Connect multimeter between terminal 1 and 4 of harness connector for voltage measurement.
2. Press switch of remote control.

Specified value: approx. battery voltage

If specified value is not obtained

1. Repair open circuit in wiring according to wiring diagram.

If specified value is obtained, although no operating noise can be heard from pump

1. Remove right fuel delivery unit --> «Right Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__right-fuel-delivery-unit-with-transfer) .

1. Check whether electrical wires between flange and Fuel Pump (FP) are connected, and test for continuity if necessary.

If no malfunctions are found in wires

1. Fuel pump faulty. Replace right fuel delivery unit --> «Right Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__right-fuel-delivery-unit-with-transfer) .
2. Install right fuel delivery unit --> «Right Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__right-fuel-delivery-unit-with-transfer) .

Test Prerequisite

1. Voltage supply of Fuel Pump (FP) OK.

1. Remove Fuse 31 (in fuse holder) SC31 (in fuse holder, right side of instrument panel, position 31).

Scheme 758

1. Connect remote control VAG1348/3A with adapter cable VAG1348/3-2 to left terminal of socket for Fuse 31 (in fuse holder) SC31 (in fuse holder, right side of instrument panel).
2. Connect alligator clip to vehicle battery B+.
3. Connect tester VAS5051 with inductive pick-up VAS5051/9 to wire of remote control.
4. Press switch of remote control.

1. Measure Fuel Pump (FP) current draw.

Specified value: approx. 8 amps

If specified value is not obtained

Note. At a displayed current draw of 4 amps, Fuel Pump (FP) runs dry.

Right Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing

Special tools, testers and auxiliary items required

1. Wrench 3087 for tank sensor

Removing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

1. To remove the fuel delivery unit, the fuel tank may only be filled to a maximum of 1 /3. Empty fuel tank if necessary. Procedure --> «Fuel Tank, Emptying»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-tank-emptying) .

1. Disconnect battery Ground (GND) strap with the ignition switched off.
2. Remove luggage compartment floor lining.

Note. To remove and install fuel delivery unit, it is advantageous to remove vehicle tools and spare wheel from luggage compartment. It is then possible to sit or kneel in spare wheel well.

1. Remove cover for right connector flange (- arrows -).

1. Carefully release and disconnect electrical harness connectors - 1 - and - 2 - on right connector flange.

1. Mark and disconnect fuel supply line - 1 - and fuel return line - 2 - (press release tab).

1. Use Wrench 3087 to remove locking ring.
2. Disconnect connector flange and remove sealing ring.

1. Disconnect electrical harness connectors -1 to - 3 - on underside of right connector flange.

Note. To disconnect the line couplings indicated in the description which follows, pull fuel lines toward opening of fuel tank. Many components in the following illustration are depicted as removed.

1. Disconnect fuel lines - 1 - and - 2 - to left fuel delivery unit through the right opening of fuel tank, press release button to do so.

3 - Right fuel delivery unit with Transfer Fuel Pump (FP) G23

Scheme 759

1. Unclip filling line (- arrow -) at front on right fuel delivery unit.

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

1. Carefully release and disconnect electrical harness connectors - 1 - and - 2 - on left connector flange.

1. Use Wrench 3087 to remove locking ring.
2. Disconnect connector flange and remove sealing ring.

1. Disconnect electrical harness connectors -1 to - 3 - on underside of left connector flange.

Scheme 760

1. Disconnect suction jet pipe - 3 - from Y-connector through left opening of fuel tank, press release button to do so.
2. Remove suction jet pipe to right opening of fuel tank.

Scheme 761

1. Press release buttons (- arrows -) through right fuel tank opening and disconnect delivery line - 1 - as well as Fuel Supply Sensor 4 G393 (- 2 -).
2. Swing Fuel Supply Sensor 4 G393 to the side toward right.

1. Press down both clips at mount for fuel delivery unit (- arrows -).
2. Remove fuel delivery unit.

Installing

1. Before installing fuel delivery unit, pull both clips upward on mount until they engage (- arrows -).
2. Now, carefully press fuel delivery unit into mount until it engages audibly.

1. Connect delivery line - 1 - and Fuel Supply Sensor 4 G393 (- 2 -) until they engage audibly on right fuel delivery unit.

1. Slide suction jet pipe - 3 - through right opening of fuel tank to left fuel tank chamber.
2. Connect suction jet pipe to Y-connector until it engages audibly.

1. Connect electrical harness connectors - 1 - to - 3 - on underside of left connector flange.
2. Insert new, dry seal for connector flange into opening of fuel tank.
3. Insert left connector flange in fuel tank, note installation position

The tab - 2 - on connector flange must lie between tabs - 1 - and - 3 - on fuel tank.

1. Tighten locking ring (120 Nm).

1. Connect electrical harness connectors - 1 - and - 2 - to left connector flange.

1. Tighten cover for left connector flange (- arrows -).

1. Insert fuel lines - 1 - and - 2 - through right opening in fuel tank to left fuel delivery unit until they engage audibly.

3 - Right fuel delivery unit with Transfer Fuel Pump (FP) G23

1. Connect electrical harness connectors - 1 - to - 3 - on underside of right connector flange.
2. Insert new, dry seal for connector flange into opening of fuel tank.
3. Insert right connector flange in fuel tank, note installation position

The tab - 2 - on connector flange must lie between tabs - 1 - and - 3 - on fuel tank.

1. Tighten locking ring (120 Nm).

1. Connect fuel supply line - 1 - and fuel return line - 2 - until they engage audibly.

1. Connect electrical harness connectors - 1 - and - 2 - to right connector flange.

1. Tighten cover for right connector flange (- arrows -).
2. Connect battery. Observe safety precautions after connecting the battery. --> «27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL»(/audi/a8/d3-2005-2007/remont/cruise-control-systems/#electrical-equipment)

Tightening Specifications

Suction Jet Pumps, Function

In order to ensure proper fuel supply in all driving conditions, especially under heavy turning or breaking, it is important that the fuel pumps do not intake any air. This is especially the case when the fuel tank is only partially filled and the fuel swashes into one corner of the fuel tank.

Therefore, the fuel delivery units - 2 - and - 5 - have, in addition to the fuel pumps, a so-called baffle housing, into which the fuel pumps are inserted. The baffle housing is a reservoir that is continuously filled with fuel so that the fuel pumps are always surrounded by fuel regardless of the fuel level in the fuel tank.

The proper filling of the baffle housing is essential to the correct function of the fuel pumps. The so-called suction jet pumps are responsible for this.

The suction jet pumps operate according to the principle of fluid entrainment: a stream of fuel from the supply pipe for fuel pump - 4 - (right side) is passed through a nozzle into the suction jet pumps - 1 - and - 6 - , and is thus accelerated. The accelerated stream of fuel draws off the surrounding fuel and delivers it to the baffle housings of the fuel delivery units. The suction jet pump (right side) - 6 - delivers the fuel directly into the baffle housing (left side), and the suction jet pump (left side) - 1 - delivers the fuel directly into the baffle housing (right side).

The fuel is distributed from the supply pipe for fuel pump (right side) to the two suction jet pumps via the two Y-connectors - 7 - and - 8 -.

Another smaller suction jet pump is located in the expansion tank - 3 - and pumps excess fuel back into the fuel tank.

Scheme 762

Left Suction Jet Pump, Removing and Installing

Removing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

1. Remove left fuel delivery unit --> «Left Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__left-fuel-delivery-unit-with-transfer) .
2. Remove left side Fuel Supply Sensor 3 G237 (tubular sensor) out of fuel tank.

1. Disconnect suction jet pipes - 1 - and - 3 - from Y-connector through left opening of fuel tank, press release button to do so.

1. Press release buttons (- arrows -) through right opening of fuel tank and disconnect delivery line - 1 -.

Note. Disregard - 2 -.

1. Pull out delivery line through left opening of fuel tank.

Scheme 763

1. Press release button (- arrow -) through left opening of fuel tank and remove retainer for suction jet pipes from mount.
2. Remove left suction jet pump with lines from left opening of fuel tank.

Installing

Scheme 764

1. Insert left suction jet pump - 1 - in fuel tank so that it lies in cut-out in baffle plate - 2 - in front in fuel tank, as shown in illustration.
2. Press in retainer for suction jet pump until it engages audibly into the mount.
3. Slide delivery line through left opening of fuel tank to the right fuel tank chamber. Note routing

Delivery line - 3 - must be routed under fuel filling line - 2 - in area of left fuel tank opening.

Note. Disregard - 1 -.

1. Connect delivery line - 1 - to right fuel delivery unit until retaining tabs engage audibly.

Note. Disregard - 2 -.

1. Insert suction jet pipes - 1 - and - 3 - into left opening of fuel tank until they engage audibly on Y-connector.
2. Insert Fuel Supply Sensor 3 G237 into fuel tank.
3. Install left fuel delivery unit --> «Left Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__left-fuel-delivery-unit-with-transfer) .

Right Suction Jet Pump, Removing and Installing

Removing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

1. Remove right fuel delivery unit --> «Right Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__right-fuel-delivery-unit-with-transfer) .
2. Remove right side Fuel Supply Sensor 4 G393 (tubular sensor) out of fuel tank.

1. Disconnect suction jet pipe - 5 - from Y-connector through left opening of fuel tank, press release button to do so.

1. Press release buttons (- arrows -) through left opening of fuel tank and disconnect delivery line - 2 -.

Note. Disregard - 1 -.

1. Pull out delivery line through right opening of fuel tank.

Scheme 765

1. Press release button (- arrow -) through right opening of fuel tank and remove retainer for suction jet pipes from mount.
2. Remove right suction jet pump with lines from right opening of fuel tank.

Installing

1. Insert right suction jet pump - 1 - in fuel tank so that it lies in cut-out in baffle plate - 2 - in front in fuel tank, as shown in illustration.
2. Press in retainer for suction jet pump until it engages audibly into the mount.
3. Slide delivery line through right opening of fuel tank to the left fuel tank chamber. Note routing

Delivery line - 1 - must be routed under fuel filling line - 2 - in area of left fuel tank opening.

Note. Disregard - 3 -.

1. Connect delivery line - 2 - to left fuel delivery unit until retaining tabs engage audibly.

Note. Disregard - 1 -.

1. Slide suction jet pipe - 5 - through right opening of fuel tank to left fuel tank chamber.
2. Connect suction jet pipe to Y-connector until it engages audibly.
3. Insert Fuel Supply Sensor 4 G393 into fuel tank.
4. Install right fuel delivery unit --> «Right Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__right-fuel-delivery-unit-with-transfer) .

Fuel Level Sensor

> Fuel Level Sensor 1, Checking

> Fuel Level Sensor 1, Removing and Installing

> Fuel Level Sensor 2, Checking

> Fuel Level Sensor 2, Removing and Installing

> Fuel Level Sensor 3, Checking

> Fuel Level Sensor 3, Removing and Installing

> Fuel Level Sensor 4, Checking

> Fuel Level Sensor 4, Removing and Installing

Fuel Level Sensor 1, Checking

Special tools, testers and auxiliary items required

Scheme 766

1. VAG1526A

Scheme 767

1. Engine/transmission hoist VAG1594A

Test Sequence

1. Remove luggage compartment floor lining.

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

1. Carefully release and disconnect electrical harness connector - 1 - on left connector flange.

Scheme 768

1. Connect multimeter between terminal 2 and 4 on connector - B - for resistance measurement.

1. For measured value 0 ohms there is a short circuit, for measured value infinity ohms an open circuit.

Note. To check resistance values "tank full" or "tank empty" , Fuel Level Sensor G must be removed --> Fuel Level Sensor 1, Removing and Installing and the sensor floater must be placed in upper or lower end position.

With sender for fuel gauge removed, the following values are obtained because of the great bending of floater arm

Fuel Level Sensor 1, Removing and Installing

Removing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

1. Fuel tank must be drained completely to remove the lever-type sender. Procedure to drain fuel tank --> «Fuel Tank, Emptying»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-tank-emptying) .

1. Remove left fuel delivery unit --> «Left Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__left-fuel-delivery-unit-with-transfer) .
2. Remove left side Fuel Level Sensor 3 G237 (tubular sensor) out of fuel tank.

Scheme 769

1. Disengage Fuel Level Sensor G (- arrow -) and pull it out of mount.

Installing

1. Insert Fuel Level Sensor G until it engages audibly into mount.
2. Insert Fuel Level Sensor 3 G237 into fuel tank.
3. Install left fuel delivery unit --> «Left Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__left-fuel-delivery-unit-with-transfer) .

Fuel Level Sensor 2, Checking

Special tools, testers and auxiliary items required

1. VAG1526A

1. VAG1594A

Test Sequence

1. Remove luggage compartment floor lining.

1. Remove cover for right connector flange (- arrows -).

1. Carefully release and disconnect electrical harness connector - 1 - on right connector flange.

Scheme 770

1. Connect multimeter between terminal 2 and 4 on connector - B - for resistance measurement.

1. For measured value 0 ohms there is a short circuit, for measured value infinity ohms an open circuit.

Note. To check resistance values "tank full" or "tank empty" , Fuel Level Sensor 2 must be removed --> Fuel Level Sensor 2, Removing and Installing and the sensor floater must be placed in upper or lower end position.

With sender for fuel gauge removed, the following values are obtained because of the great bending of floater arm

Fuel Level Sensor 2, Removing and Installing

Removing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

1. Fuel tank must be drained completely to remove the lever-type sender. Procedure to drain fuel tank --> «Fuel Tank, Emptying»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-tank-emptying) .

1. Remove right fuel delivery unit --> «Right Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__right-fuel-delivery-unit-with-transfer) .
2. Remove right side Fuel Supply Sensor 4 G393 (tubular sensor) out of fuel tank.

Scheme 771

1. Disengage Fuel Level Sensor 2 G169 (- arrow -) and pull it out of mount.

Installing

1. Insert Fuel Level Sensor 2 G169 until it engages audibly into mount.
2. Insert Fuel Level Sensor 4 G393 into fuel tank.
3. Install right fuel delivery unit --> «Right Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__right-fuel-delivery-unit-with-transfer) .

Fuel Level Sensor 3, Checking

Special tools, testers and auxiliary items required

1. VAG1526A

1. Engine/transmission hoist VAG1594A

Test Sequence

1. Remove luggage compartment floor lining.

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

1. Carefully release and disconnect electrical harness connector - 2 - on left connector flange.

1. Connect multimeter between terminal 2 and 3 on connector - A - for resistance measurement.

1. For measured value 0 ohms there is a short circuit, for measured value infinity ohms an open circuit.

Note. To check resistance values "tank full" or "tank empty" , Fuel Level Sensor 3 must be removed --> Fuel Level Sensor 3, Removing and Installing and the sensor floater must be allowed to glide to upper or lower end position.

Fuel Level Sensor 3, Removing and Installing

Special tools, testers and auxiliary items required

1. Wrench 3087 for tank sensor

Removing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

1. To remove the tubular sensor, the left fuel tank chamber may only be filled to a maximum of 1 /3. Procedure to drain fuel tank --> «Fuel Tank, Emptying»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-tank-emptying) .

1. Disconnect battery Ground (GND) strap with the ignition switched off.
2. Open fuel filler cap briefly and then close again.
3. Remove luggage compartment floor lining.

Note. To remove and install tubular sensor, it is advantageous to remove vehicle tools and spare wheel from luggage compartment. It is then possible to sit or kneel in spare wheel well.

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

1. Carefully release and disconnect electrical harness connectors - 1 - and - 2 - on left connector flange.

1. Use Wrench 3087 to remove locking ring.
2. Disconnect connector flange and remove sealing ring.

1. Disconnect electrical harness connectors -1 to - 3 - on underside of left connector flange.

1. Press release buttons (- arrows -) through left fuel tank opening and disconnect delivery line - 2 - as well as Fuel Level Sensor 3 G237 (- 1 -).
2. Swing Fuel Level Sensor 3 G237 to the side toward left.

1. Press down both clips at mount for fuel delivery unit (- arrows -).
2. Pull fuel delivery unit slightly upward and remove Fuel Level Sensor 3 G237 simultaneously.

Installing

1. Before installing fuel delivery unit, pull both clips upward on mount until they engage (- arrows -).
2. Carefully press fuel delivery unit into mount until it engages audibly.

1. Connect delivery line - 2 - and Fuel Level Sensor 3 G237 (- 1 -) until they engage audibly.

1. Connect electrical harness connectors - 1 - to - 3 - on underside of left connector flange.
2. Insert new, dry seal for connector flange into opening of fuel tank.
3. Insert left connector flange in fuel tank, note installation position

The tab - 2 - on connector flange must lie between tabs - 1 - and - 3 - on fuel tank.

1. Tighten locking ring (120 Nm).

1. Connect electrical harness connectors - 1 - and - 2 - to left connector flange.

1. Tighten cover for left connector flange (- arrows -).
2. Connect battery. Observe safety precautions after connecting the battery. --> «27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL»(/audi/a8/d3-2005-2007/remont/cruise-control-systems/#electrical-equipment)

Tightening Specifications

Fuel Level Sensor 4, Checking

Special tools, testers and auxiliary items required

1. VAG1526A

1. Engine/transmission hoist VAG1594A

Test Sequence

1. Remove luggage compartment floor lining.

1. Remove cover for right connector flange (- arrows -).

1. Carefully release and disconnect electrical harness connector - 2 - on right connector flange.

1. Connect multimeter between terminal 2 and 3 on connector - A - for resistance measurement.

1. For measured value 0 ohms there is a short circuit, for measured value infinity ohms an open circuit.

Note. To check resistance values "tank full" or "tank empty" , Fuel Supply Sensor 4 G393 must be removed --> Fuel Level Sensor 4, Removing and Installing and the sensor floater must be placed in upper or lower end position.

Fuel Level Sensor 4, Removing and Installing

Special tools, testers and auxiliary items required

1. Wrench 3087 for tank sensor

Removing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

1. To remove the tubular sensor, the right fuel tank chamber may only be filled to a maximum of 1 /3. Procedure to drain fuel tank --> «Fuel Tank, Emptying»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-tank-emptying) .

1. Disconnect battery Ground (GND) strap with the ignition switched off.
2. Open fuel filler cap briefly and then close again.
3. Remove luggage compartment floor lining.

Note. To remove and install tubular sensor, it is advantageous to remove vehicle tools and spare wheel from luggage compartment. It is then possible to sit or kneel in spare wheel well.

1. Remove cover for right connector flange (- arrows -).

1. Carefully release and disconnect electrical harness connectors - 1 - and - 2 - on right connector flange.

1. Mark and disconnect fuel supply line - 1 - and fuel return line - 2 - (press release tab).

1. Use Wrench 3087 to remove locking ring.
2. Disconnect connector flange and remove sealing ring.

1. Disconnect electrical harness connectors -1 to - 3 - on underside of right connector flange.

Note. To disconnect the line couplings indicated in the description which follows, pull fuel lines toward opening of fuel tank. Many components in the following illustration are depicted as removed.

1. Disconnect fuel lines - 1 - and - 2 - to left fuel delivery unit through the right opening of fuel tank, press release button to do so.

3 - Right fuel delivery unit with Fuel Pump (FP) G23

1. Press release buttons (- arrows -) through right fuel tank opening and disconnect delivery line - 1 - as well as Fuel Supply Sensor 4 G393 (- 2 -).
2. Swing Fuel Supply Sensor 4 G393 to the side toward right.

1. Press down both clips at mount for fuel delivery unit (- arrows -).
2. Pull fuel delivery unit slightly upward and remove Fuel Supply Sensor 4 G393 simultaneously.

Installing

1. Before installing fuel delivery unit, pull both clips upward on mount until they engage (- arrows -).
2. Carefully press fuel delivery unit into mount until it engages audibly.

1. Connect delivery line - 1 - and Fuel Level Sensor 4 G393 (- 2 -) until they engage audibly.

1. Insert fuel lines - 1 - and - 2 - through right opening in fuel tank to left fuel delivery unit until they engage audibly.

3 - Right fuel delivery unit with Fuel Pump (FP) G23

1. Connect electrical harness connectors - 1 - to - 3 - on underside of right connector flange.
2. Insert new, dry seal for connector flange into opening of fuel tank.
3. Insert right connector flange in fuel tank, note installation position

The tab - 2 - on connector flange must lie between tabs - 1 - and - 3 - on fuel tank.

1. Tighten locking ring (120 Nm).

1. Connect fuel supply line - 1 - and fuel return line - 2 - until they engage audibly.

1. Connect electrical harness connectors - 1 - and - 2 - to right connector flange.

1. Tighten cover for right connector flange (- arrows -).
2. Connect battery. Observe safety precautions after connecting the battery. --> «27 - BATTERY, STARTER, GENERATOR, CRUISE CONTROL»(/audi/a8/d3-2005-2007/remont/cruise-control-systems/#electrical-equipment)

Tightening Specifications

Fuel Filter, Servicing

> Fuel Filter with Fuel System Return Line, Component Overview

> Fuel Filter with Return Line, Removing and Installing

> Fuel Filter without Return Line, Component Overview

> Fuel Filter without Return Line, Removing and Installing

Fuel Filter with Fuel System Return Line, Component Overview

Note. Secure all hose connections using hose clamps appropriate for the model type

Scheme 772

1 - Fuel return line

1. From fuel rail pipe
2. Clipped in on fuel filter bracket
3. To disconnect, press release button on connection piece

2 - Fuel filter

1. Direction of flow is marked with (- arrows -)
2. Do not interchange connections
3. Removing and installing --> «Fuel Filter with Return Line, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-filter-with-return-line-removing)

3 - Fuel supply line

1. From fuel tank
2. To disconnect, press release button on connection piece

4 - Bracket

1. For fuel filter

5 - 1.5 Nm

6 - Fuel supply line

1. To fuel rail pipe
2. To disconnect, press release button on connection piece

7 - 3 Nm

Fuel Filter with Return Line, Removing and Installing

Special tools, testers and auxiliary items required

1. Reservoir

Removing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

1. Remove cover - 1 - , right, bottom at vehicle floor.
2. Place appropriate receptacle underneath fuel filter.

Scheme 773

1. Disconnect fuel lines - 1 - and - 3 - (press release button).
2. Remove bolt - 2 -.
3. Remove fuel filter.

Installing

Installation is the reverse of removal, noting the following

1. The direction of flow is marked with - arrows

Tightening Specifications

Fuel Filter without Return Line, Component Overview

Note. Secure all hose connectors with hose clamps appropriate for the model type

Scheme 774

1 - Oil filter with pressure regulator (4 bar)

1. Flow through direction is identified with - arrows
2. Do not interchange connections
3. Removing and installing --> «Fuel Filter without Return Line, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__fuel-filter-without-return-line-removing)

2 - Fuel supply line

1. From fuel tank
2. To remove, press release button on connector piece

3 - Fuel return line

1. From fuel rail pipe
2. Clipped onto fuel filter bracket
3. To remove, press release button on connector piece

4 - Bracket

1. For fuel filter

5 - 1,5 Nm

6 - Fuel line

1. To fuel rail pipe
2. To remove, press release button on connector piece

7 - 3 Nm

Fuel Filter without Return Line, Removing and Installing

Special tools, testers and auxiliary items required

1. Drip tray

Removing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

1. Remove right cover - 1 - from bottom of vehicle floor.
2. Place container underneath fuel filter.

Scheme 775

1. Remove fuel lines - 1 - , - 2 - and - 4 - (press release button).
2. Remove bolts - 3 -.
3. Remove fuel filter.

Installing

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

1. The flow-through direction is identified with - arrows

Tightening Specifications

EVAP System Components, Servicing

> Component Overview

> EVAP Canister, Removing and Installing

> EVAP System with Leak Diagnostic Pump, Hose Layout

> EVAP System Diagnostic Leak Test, Performing

> EVAP Canister Purge Regulator Valve, Electrical Testing

> EVAP Canister Purge Solenoid Valve 2, Electrical Testing

> Leak Detection Pump, Component Overview

> Leak Detection Pump, Checking

> Leak Detection Pump, Removing and Installing

Scheme 776

1 - Cover

1. For EVAP canister

2 - Vent line

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

3 - Vent line

1. To fuel tank

4 - EVAP canister

1. Component location: Below, in spare tire well at vehicle floor

5 - Connection hose

1. Leak Detection Pump (LDP)/EVAP canister

6 - Socket

7 - Rubber grommet

8 - Pin bolt - 16 Nm

9 - Cap nut - 9 Nm

EVAP Canister, Removing and Installing

Note. Checking seal Performing leak diagnostic, --> EVAP System Diagnostic Leak Test, Performing

Removing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

Scheme 777

1. Remove EVAP canister cover at bottom of spare wheel well (- arrows -).

Scheme 778

1. Disconnect hose connections - 1 - to - 3 - at ventilation lines.
2. Remove pin bolts (- arrows -) and remove EVAP canister.

Installing

Installation is the reverse of removal, noting the following

Note. Secure all hose connections using hose clamps appropriate for the model type

Tightening Specifications

Scheme 779

1 - Throttle Valve Control Module J338

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

1. Component location: In engine compartment

3 - Vent line

1. From EVAP canister to Evaporative Emission (EVAP) Canister Purge Regulator Valve N80
2. Installed position: Right side, beneath vehicle floor

4 - Vent line

1. To fuel tank

5 - EVAP canister

1. Component location: Below, in spare tire well at vehicle floor

6 - Connection hose

1. Leak Detection Pump (LDP)/EVAP canister
2. Pressure side

7 - Leak detection pump (LDP) V144

1. Activated by low pressure
2. Component location: Under wheel housing liner in rear left wheelhousing

8 - Air filter

1. For diagnostic pump

9 - Vacuum line

1. Delivers low pressure from intake manifold to diagnostic pump drive

EVAP System Diagnostic Leak Test, Performing

Observe safety precautions --> Fuel Supply System, Safety Precautions .

Observe rules for cleanliness --> Clean Working Conditions .

Function

The evaporative emissions (EVAP) system, diagnostic leak test recognizes leaks in the entire fuel system including the fuel tank, Evaporative Emission (EVAP) canister and Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.

On the mechanical side, the leak detection system consists primarily of a vacuum activated diaphragm pump with a reed contact on an activating rod at the pump diaphragm. The pump is supplied its vacuum via the engine intake.

1. When diagnostic leak test is activated, the Leak Detection Pump (LDP) increases pressure in the fuel system to 20 to 30 mbar. The pump membrane is then expanded so that the reed contact at the operating rod remains in the "open" position.
2. The diagnostic will test whether the reed contact remains open within 10 seconds. Then the fuel system is leak-free.
3. If pressure falls (indicating a leak), the diaphragm moves and the reed contact closes.
4. If reed contact closes within 10 seconds of leak detection time, perform a further test: If this is the case, the membrane pump will pump 4 additional strokes. The Engine Control Module (ECM) measures the time between these 4 strokes and closure of the reed contact. From that, the control module recognizes a "small leak" (greater than 1 mm in diameter) or a "large leak".

Leak diagnostic is activated automatically shortly following every engine start. If a malfunction is recognized, a DTC entry follows. The Malfunction Indicator Lamp (MIL) in the instrument cluster will light up if the malfunction is recognized for two subsequent starts.

With engine running, Engine Control Module (ECM) performs a diagnostic leak test automatically in certain intervals.

Note. Secure all hose connections using hose clamps appropriate for the model type Always replace seals and gaskets.

Function Test

1. Start engine and let it run 15 minutes at idle.
2. Select measuring value "Test-ID 01: Tank leak test" and check whether specified value is being reached --> «Diagnostic Mode 08 - Request Control of On-Board System, Test or Component»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-08-request-control) .
3. Check specified value of tank leak test at idle.

Specified value: Test OK

Note. The function test can take a few minutes. If the accelerator pedal is depressed during the test, the test will be aborted. To repeat the tank leak test, switch ignition off and start engine again and let run at idle.

1. End diagnosis and switch ignition off.

If specified value is not reached, check tank system for proper seal.

Fuel Supply and Ventilation Systems, Checking for Leaks

Note. The following describes areas in the fuel supply and ventilation systems that should be checked for possible leaks. After making necessary repairs, perform leak test again to ensure that all leaks were successfully repaired.

1. Switch ignition off.
2. Check whether fuel filler cap was completely closed for test.
3. Check whether seal of fuel filler cap is damaged or pinched and must be replaced.
4. Remove luggage compartment floor lining.

1. Remove covers for connector flange on left and right sides.

Note. Observe installation notes for connector flange --> Left Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing or --> Right Fuel Delivery Unit with Transfer Fuel Pump, Removing and Installing .

1. Check whether seals under connector flanges are OK and locking rings are properly tightened on fuel tank. Also check fuel line connections.
2. Visually check all lines and hose connections of fuel supply system and replace leaking lines, e.g.

Line from EVAP canister to Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 (in engine compartment)

Lines from EVAP canister to Leak detection pump (LDP) V144.

Line from fuel tank to Evaporative Emission (EVAP) canister (under cover for EVAP canister)

Fuel lines to engine

Note. Leaks at lines and components of fuel supply system can sometimes be located using a non-flammable, environmentally sound leak detection spray. For this, initiate leak diagnostic several times in sequence to build pressure in the system. Leaks can be detected via bubbles.

1. Visually check components of fuel supply system and EVAP system.

Fuel tank

EVAP canister

Leak detection pump (LDP) V144

Evaporative Emission (EVAP) Canister Purge Regulator Valve N80

Note. Because of shape or function of these components it is not always possible to find leaks by applying spray. It may be necessary to clamp off the relevant component using hose clamps 3094 and initiate leak detection diagnostic. If leak is no longer detected, the component that was clamped off is faulty. If clamp is placed directly on the diagnostic pump and a leak is still detected, then the diagnostic pump itself is leaking.

Scheme 780

1. Disconnect connector at Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.
2. Perform a resistance measurement between terminals on valve using portable multimeter VAG1526.

Specified value: 20 to 35 ohms

If specified value is not reached, replace Evaporative Emission (EVAP) Canister Purge Regulator Valve.

1. Read readiness code --> «Readiness Code, Reading»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-reading) . If DTC memory was erased, readiness code must be generated again --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-generating)

If specified value is obtained, check voltage supply.

Voltage Supply, Checking

Test Prerequisite

1. Fuse for Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 (in relay- and fuse holder in instrument panel, right side) OK.

1. Disconnect connector at Evaporative Emission (EVAP) Canister Purge Regulator Valve N80.

Scheme 781

1. Connect voltage test lamp VAG1527 between terminal 1 of connector and engine Ground (GND)
2. Switch ignition on.

LED must light up.

1. If LED does not light up, check wire connection from terminal 1 via fuse for Evaporative Emission (EVAP) Canister Purge Regulator Valve N80 (relay- and fuse holder in instrument panel, right side) to Motronic Engine Control Module (ECM) Power Supply Relay J271 (relay carrier in E-box in plenum chamber) for open circuit. --> Electrical Wiring Diagrams, Troubleshooting and Component Locations
2. If voltage supply is OK, check wire connection.

Wire Connection, Checking

1. Connect test box VAG1598/31 to wiring harness of Engine Control Module (ECM) --> «Wire and Component Test at Engine Control Module using VAG 1598/31»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm) .
2. Check the following wire connection for open circuit/short circuit

1. Repair open circuit in wiring or short circuit if necessary. --> Electrical Wiring Diagrams, Troubleshooting and Component Locations
2. Check EVAP system hose setup for proper seal or throughput.
3. If wire connection and hose setup are OK, replace Engine Control Module (ECM) --> «Engine Control Module, Replacing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__engine-control-module-replacing) and generate readiness code again --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-generating) .

EVAP Canister Purge Solenoid Valve 2, Electrical Testing

Component location: In rear left wheel housing under wheel housing liner

1. Disconnect connector at Evaporative Emission (EVAP) Canister Purge Solenoid Valve 2 N115.
2. Perform a resistance measurement between terminals on valve using portable multimeter VAG1526.

Specified value: 20 to 35 ohms

If specified value is not reached, replace Evaporative Emission (EVAP) Canister Purge Regulator Valve.

1. Read readiness code --> «Readiness Code, Reading»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-reading) . If DTC memory was erased, readiness code must be generated again --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-generating)

If specified value is obtained, check voltage supply.

Test Prerequisite

1. Fuse for Evaporative Emission (EVAP) Canister Purge Solenoid Valve 2 N115 (in relay- and fuse holder in instrument panel, right side) OK.

1. Disconnect connector at Evaporative Emission (EVAP) Canister Purge Solenoid Valve N115.

1. Connect voltage test lamp VAG1527 between terminal 1 of connector and engine Ground (GND)
2. Switch ignition on.

LED must light up.

1. If LED does not light up, check wire connection from terminal 1 via fuse for Evaporative Emission (EVAP) Canister Purge Solenoid Valve N115 (relay- and fuse holder in instrument panel, right side) to Motronic Engine Control Module (ECM) Power Supply Relay J271 (relay carrier in E-box in plenum chamber) for open circuit. --> Electrical Wiring Diagrams, Troubleshooting and Component Locations
2. If voltage supply is OK, check wire connection.

Wire Connection, Checking

1. Connect test box VAG1598/31 to wiring harness of Engine Control Module (ECM) --> «Wire and Component Test at Engine Control Module using VAG 1598/31»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm) .
2. Check the following wire connection for open circuit/short circuit

1. Repair open circuit in wiring or short circuit if necessary. --> Electrical Wiring Diagrams, Troubleshooting and Component Locations
2. Check EVAP system hose setup for proper seal or throughput.
3. If wire connection and hose setup are OK, replace Engine Control Module (ECM) --> «Engine Control Module, Replacing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__engine-control-module-replacing) and generate readiness code again --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-generating) .

Scheme 782

1 - 9 Nm

2 - Retaining pins

3 - Bracket

1. At Leak Detection Pump (LDP)

4 - Vacuum line

1. To front intake manifold

5 - Leak detection pump (LDP) V144

1. Component location: In rear left wheel housing under wheel housing liner

6 - 1.2 Nm

7 - Clamp

8 - Vacuum line

1. To EVAP canister

9 - Air filter

1. For Leak detection pump (LDP) V144

10 - Hose

11 - Bracket

1. To chassis

Leak Detection Pump, Checking

Special tools, testers and auxiliary items required

1. VAG1526A
2. VAG1527B
3. VAG1594A
4. VAG1598/31

1. Remove Leak detection pump (LDP) V144 --> «Leak Detection Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__leak-detection-pump-removing-and-installing) and disconnect electrical harness connector.

Scheme 783

1. Connect multimeter for resistance measurement as follows.

If specified values are not obtained

1. Replace Leak detection pump (LDP) V144 --> «Leak Detection Pump, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__leak-detection-pump-removing-and-installing) .

If specified values are obtained

1. Check voltage supply of Leak Detection Pump (LDP).

Note. Voltage is supplied to the Leak Detection Pump (LDP) via the Fuel Pump (FP) relay.

Test Prerequisite

1. Fuse for Leak Detection Pump (LDP) OK.

Scheme 784

1. Connect multimeter for voltage measurement as follows

1. Operate starter briefly.

Specified value: approx. battery voltage

1. Switch ignition off.

If specified value is not obtained

1. Check electrical wire connection from terminal 3 to Fuel Pump (FP) relay via fuse for open circuit according to wiring diagram. --> Electrical Wiring Diagrams, Troubleshooting and Component Locations
2. Repair open circuit in wiring if necessary.
3. If voltage supply is OK, check wire connection.

Engine Control Module, Checking Ground

1. Connect multimeter as follows

1. Operate starter briefly.

Specified value: approx. battery voltage

1. Switch ignition off.

If the specified values are not reached, check wire connection.

Wire Connections, Checking

1. Connect test box VAG1598/31 to harness connectors of wiring harness (do not connect ECM). Connect Ground (GND) clip at test box (not visible in illustration) to Ground (GND) --> «Wire and Component Test at Engine Control Module using VAG 1598/31»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm) .

1. Check the following wire connection for open circuit and short circuit to Ground (GND) and B+

1. Repair open circuit in wiring or short circuit if necessary. --> Electrical Wiring Diagrams, Troubleshooting and Component Locations
2. In addition, check both wires to each other for short circuit.

Specified value: infinity ohms (no continuity)

1. If no malfunction was detected during the previous tests, replace Engine Control Module (ECM) --> «Engine Control Module, Replacing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__engine-control-module-replacing) .
2. Read readiness code --> «Readiness Code, Reading»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-reading) . If DTC memory was erased, readiness code must be generated again --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-generating) .

Leak Detection Pump, Removing and Installing

Removing

1. Remove left rear wheel.
2. Remove wheel housing liner, rear left: --> «66 - EXTERIOR EQUIPMENT»(/audi/a8/d3-2005-2007/remont/door-locks-anti-theft-systems/#body-exterior)

Scheme 785

1. Disconnect hose connections - 1 - , - 5 - and - 6 - at vent lines.
2. Remove securing bolts - 2 - and - 3 -.
3. Remove Leak Detection Pump (LDP), disengage harness connector for electrical wire - 4 - with ignition off and disconnect.

Installing

Installation is the reverse of removal, noting the following

Note. Secure all hose connections using hose clamps appropriate for the model type

Tightening Specifications

Fuel Tank Lock Switch

Fuel Tank Lock Switch F314 consists of a reed contact on fuel filler tube and a connector flange cap with an embedded magnet. With a connector flange cap that is not fully screwed on, the reed contact switches and triggers an indication on the display in instrument cluster.

1. Check the following items in order with a lighted display

Scheme 786

1. Proper connector flange cap (recognized by: with magnet (- arrow -)
2. Connector flange cap is fully screwed on

Scheme 787

1. Switch - 1 - is fully inserted at fuel filler tube
2. Electrical fault in switch. --> «Electrical test for Fuel Tank Lock Switch F314»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__electrical-test-for-fuel-tank-lock)
3. Faulty wiring connection to instrument cluster (check according to wiring diagram)

Electrical test for Fuel Tank Lock Switch F314

1. Rear right wheelhousing liner, removing: --> «66 - EXTERIOR EQUIPMENT»(/audi/a8/d3-2005-2007/remont/door-locks-anti-theft-systems/#body-exterior)

1. Disconnect electrical harness connector - 2 -.

Scheme 788

1. Connect multimeter between terminal 1 and 2 for resistance measurement.

If specified values are not obtained

1. Replace Fuel Tank Lock Switch F314. To do so, disconnect electrical harness connector - 2 - and unclip/clip switch with connection from bracket.

Accelerator Linkage, Servicing

> Throttle Position Sensor, Checking

> Accelerator Pedal Module with Throttle Position Sensor and Accelerator Pedal Position Sensor 2, Removing and Installing

> Kick Down Switch, Checking

> Kick Down Switch, Removing and Installing

Scheme 789

1 - Accelerator pedal module

1. With Throttle Position (TP) Sensor G79 and Accelerator Pedal Position Sensor 2 G185

2 - 10 Nm

3 - 6-pin harness connector

4 - 10 Nm

Throttle Position Sensor, Checking

Both the Throttle Position (TP) Sensor G79 and Accelerator Pedal Position Sensor 2 G185 are located at the accelerator pedal and communicate the drivers intentions to the ECM completely independently of each other. Both sensors are stored in one housing.

Special tools, testers and auxiliary items required

1. Multimeter VAG1526 or Multimeter VAG1715
2. Connector test kit VAG1594
3. Wiring diagram

Test Prerequisite

1. The respective fuses of Engine Control Module (ECM) must be OK: --> Electrical Wiring Diagrams, Troubleshooting and Component Locations

Test Sequence

Note. When servicing terminals in the harness connector for the Throttle Position (TP) Sensor, use only gold-plated terminals.

1. Remove footwell cover (drivers side).
2. Disconnect 6-pin connector from Throttle Position (TP) Sensor.

1. Switch ignition on.

Scheme 790

1. Connect multimeter to the following connector terminals for voltage measurement.

1. Switch ignition off.

If specified values are not reached, check wire connections.

Wiring, Checking

1. Connect test box VAG1598/31 to wiring harness of Engine Control Module (ECM) --> «Wire and Component Test at Engine Control Module using VAG 1598/31»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm) .
2. Check the following wire connection for open circuit/short circuit

1. Repair open circuit in wiring or short circuit if necessary. --> Electrical Wiring Diagrams, Troubleshooting and Component Locations
2. Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.

Specified value: infinity ohms (no continuity)

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

1. Replace accelerator pedal module --> «Accelerator Pedal Module with Throttle Position Sensor and Accelerator Pedal Position Sensor 2, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__accelerator-pedal-module-with-throttle-position) .
2. Erase DTC memory of Engine Control Module (ECM) --> «Diagnostic Mode 04 - Erase DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-04-erase-dtc) .
3. Generate readiness code --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-generating) .

Accelerator Pedal Module with Throttle Position Sensor and Accelerator Pedal Position Sensor 2, Removing and Installing

Removing

1. Remove driver-side storage compartment. --> «68 - INTERIOR EQUIPMENT»(/audi/a8/d3-2005-2007/remont/gauges-instrument-panels/#body-interior)

Scheme 791

1. Disconnect 6-pin harness connector - 2 -.
2. Remove bolts - 1 - and - 3 -.
3. Remove accelerator pedal module.

Installing

Installation is performed in the reverse order of removal.

Tightening Specifications

Kick Down Switch, Checking

Special tools, testers and auxiliary items required

1. Engine/transmission hoist VAG1526A
2. Engine/transmission hoist VAG1594A

1. Pry off covers using a screwdriver.

Scheme 792

1. Remove bolts (- arrows -) and remove cover for kick down switch.
2. Disconnect electrical harness connector.
3. Connect multimeter at kick down switch for resistance measurement.

Specified value: infinity ohms (no continuity)

1. Move accelerator pedal slowly in direction of Wide Open Throttle (WOT).

Shortly after kickdown point, resistance must drop to 0 ohms

If indications do not resemble description

1. Replace kick down switch --> «Kick Down Switch, Removing and Installing»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__kick-down-switch-removing-and-installing) .
2. Erase DTC memory of Engine Control Module (ECM) --> «Diagnostic Mode 04 - Erase DTC Memory»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__diagnostic-mode-04-erase-dtc) .
3. Generate readiness code --> «Readiness Code, Generating»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__readiness-code-generating) .

Kick Down Switch, Removing and Installing

Removing

1. Pry off covers using a screwdriver.

1. Remove bolts (- arrows -) and remove cover for kick down switch.

Scheme 793

1. Disengage retaining tab (- arrow -) using a small screwdriver and turn kick down switch counter-clockwise.
2. Disconnect electrical harness connector.

Installing

Installation is performed in reverse order of removal.

Motronic Injection System, Servicing

> Safety Precautions

> Clean Working Conditions

> Technical Data

> Component Location Overview

> Fuel Pressure Regulator and Residual Pressure with Return Line, Checking

> Fuel Pressure Regulator and Residual Pressure without Return Line, Checking

> Fuel Injection Quantity, Checking for Leaks and Spray Pattern

> Fuel Injectors, Checking

> Intake System, Checking for Leaks

> Fuel Pump Relay, Checking

> Fuel Pump 2 Relay, Checking

> Engine Control Module, Replacing

Safety Precautions

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

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

1. Only disconnect and reconnect wires for injection and ignition system, including test leads, when ignition is turned off.
2. If engine is to be cranked at starting RPM without starting (e.g. for compression pressure testing), disconnect connector from power output stages for ignition coils and from fuel injectors.
3. It is possible that the control module will recognize a malfunction and store a DTC during some tests. After completing all tests and repairs, DTC memory should therefore be checked and erased if necessary.
4. Always switch ignition off before cleaning engine.

1. The battery must only be disconnected and connected with the ignition switched off, since the Engine Control Module (ECM) can otherwise be damaged.

Note. When working on the fuel supply or fuel injection systems, the following "6 rules of cleanliness" should be carefully observed: Thoroughly clean all connections and the surrounding area before disconnecting. Place parts that have been removed on a clean surface and cover them. Use lint-free cloths only! Carefully cover over opened components or seal, if repairs are not performed immediately. 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.) When the system is open: Avoid working with compressed air. Do not move vehicle unless absolutely necessary. Disconnected electrical harness connectors: Protect from dirt and moisture, be sure harness connector is dry before connecting.

Technical Data

* Current values: --> Emissions Test binder

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

Component Location Overview

Components A through N are not depicted in the exploded view illustration.

A - Exhaust Malfunction Indicator Lamp (MIL)

1. In instrument cluster (Meaning of lamp)
2. > «Exhaust Malfunction Indicator Lamp (MIL)»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__exhaust-malfunction-indicator-lamp-mil)

B - "EPC" warning lamp

1. In instrument cluster (Meaning of lamp)
2. > «EPC warning lamp»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

C - Throttle Position (TP) Sensor G79 and Accelerator Pedal Position Sensor 2 G185

1. In footwell on accelerator pedal (both sensors are stored in one housing)

D - Fuel Pump (FP) Relay J17

1. 5-pin relay carrier in passengers footwell, position 4
2. > «Relay carrier in front passengers footwell»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__relay-carrier-in-front-passengers-footwell)

E - Fuel Pump (FP) 2 Relay J49

1. Relay- and fuse holder in luggage compartment, right side, relay position 3
2. > «Relay and fuse holder, in luggage compartment, right side»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

F - Secondary Air Injection (AIR) Pump Relay J299

1. 3-pin relay carrier in E-box plenum chamber, relay position 3
2. > «Relay carrier in E-box, plenum chamber»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

G - Motronic Engine Control Module (ECM) Power Supply Relay J271

1. 4-pin relay carrier in E-box plenum chamber, relay position 3
2. > «Relay carrier in E-box, plenum chamber»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

H - Starter relay 1

1. > «Relay carrier in front passengers footwell»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__relay-carrier-in-front-passengers-footwell)

I - Starter relay 2

1. > «Relay carrier in front passengers footwell»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__relay-carrier-in-front-passengers-footwell)

J - 3-pin harness connector for Engine Speed (RPM) Sensor G28

1. > «Connector strip (bolted to underside of transmission)»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

K - 4-pin harness connector for Heated Oxygen Sensor (HO2S) G39 and Oxygen Sensor (O2S) Heater Z19 before catalytic converter

1. Bank 1
2. > «Connector assignment»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__connector-assignment)

L - 4-pin harness connector for Heated Oxygen Sensor (HO2S) 2 G108 and Oxygen Sensor (O2S) 2 Heater Z28 before catalytic converter

1. Bank 2
2. > «Connector assignment»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__connector-assignment)

M- 4-pin harness connector for Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 and Oxygen Sensor (O2S) Heater 1 Z29 behind catalytic converter

1. Bank 1
2. > «Connector strip (bolted to underside of transmission)»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

N - 4-pin harness connector for Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 and Oxygen Sensor (O2S) Heater 2 Z30 behind catalytic converter

1. Bank 2
2. > «Connector strip (bolted to underside of transmission)»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

Scheme 794

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

1. > «Connector assignment»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm__connector-assignment)

2 - Engine Control Module (ECM) J623

1. In plenum chamber
2. > «E-box in plenum chamber»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

3 - Mass Air Flow (MAF) Sensor G70 with Intake Air Temperature (IAT) Sensor G42

4 - Camshaft Adjustment Valve 1 N205

5 - Throttle Valve Control Module J338

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

6 - Secondary Air Injection (AIR) Solenoid Valve N112

1. > «Secondary Air Injection (AIR) solenoid valve»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

7 - Camshaft Position (CMP) Sensor 2 G163

1. Cylinder bank 2

8 - Fuel pressure regulator

9 - Ignition coils with power output stages

1. Cylinder bank 2

10 - Camshaft Adjustment Valve 2 N208

11 - 3-pin harness connector

1. For Knock Sensor (KS) 1 G61
2. For Knock Sensor (KS) 2 G66
3. > «Connector for knock sensors»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

12 - Vacuum diaphragms for intake manifold change-over

13 - Intake Air Switch-over valve N335

1. Activation for flap in air filter

14 - Intake Manifold Change-Over Valve N156

1. Activation for both vacuum diaphragms

15 - Camshaft Position (CMP) Sensor G40

1. Cylinder bank 1

16 - Ignition coils with power output stages

1. Cylinder bank 1

17 - Secondary Air Injection (AIR) Pump Motor V101

1. Below right longmember
2. > «Secondary Air Injection (AIR) pump (below right longmember)»(/audi/a8/d3-2005-2007/remont/cooling-fan/#42l-v8-5v-generic-scan-tool-engine-codes-bfm)

Relay carrier in front passengers footwell

2 - Starter relay 1

3 - Starter relay 2

4 - Fuel Pump (FP) Relay J17

Scheme 795

3 - Fuel Pump (FP) 2 Relay J49

Scheme 796

1. Secondary Air Injection (AIR) Pump Relay J299 , relay position 1
2. Motronic Engine Control Module (ECM) Power Supply Relay J271 , relay position 3
3. Fuse for secondary air pump S130

Exhaust Malfunction Indicator Lamp (MIL)

The Malfunction Indicator Lamp (MIL) lights up when exhaust relevant malfunctions are recognized by the Engine Control Module (ECM).

Component location of exhaust MIL

Note. The Malfunction Indicator Lamp (MIL) can blink or remain lit continuously. DTC memory should be checked in any case.

MIL blinking

1. There is a malfunction that causes damage to the catalytic converter in this driving condition. In this case, drive must only be performed at reduced power (until the MIL goes out or remains constantly lit) and malfunction must be eliminated as quickly as possible!

MIL continuously lit

1. There is a malfunction that causes increased emissions. Check DTC memory for Engine Control Module (ECM) and automatic transmission.
2. If there are driveability problems or customer complaints and the MIL is not lit, DTC memory must be checked after function test of exhaust MIL, since malfunctions can also be stored without causing the MIL to light immediately.

Scheme 797

"EPC" is an abbreviation and stands for Electronic Power Control.

Installation location of EPC warning lamp

With ignition on, Engine Control Module (ECM) activates the EPC warning lamp.

After engine start, ECM tests all components important for the function of the EPC system.

During the test of these components, the EPC lamp is lit for approx. 3 seconds. If a malfunction is recognized during the test, the lamp will remain constantly lit.

If malfunctions are recognized in the E-Gas system during operation of the engine, the ECM switches on the EPC warning lamp in instrument cluster. An entry is made in DTC memory at the same time.

Connector assignment

1. Evaporative Emission (EVAP) Canister Purge Regulator Valve N80
2. 4-pin harness connector for Heated Oxygen Sensor (HO2S) 2 G108 and Oxygen Sensor (O2S) 2 Heater Z28 before catalytic converter, bank 2
3. 4-pin harness connector for Heated Oxygen Sensor (HO2S) G39 and Oxygen Sensor (O2S) Heater Z19 before catalytic converter, bank 1

Scheme 798

1. Engine Control Module (ECM) J623

Scheme 799

1. 3-pin harness connector for Engine Speed (RPM) Sensor G28
2. 4-pin harness connector for Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) G130 and Oxygen Sensor (O2S) Heater 1 Z29 behind catalytic converter, bank 1
3. 4-pin harness connector for Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) G131 and Oxygen Sensor (O2S) Heater 2 Z30 behind catalytic converter, bank 2

Scheme 800

1. 3-pin harness connector for Knock Sensor (KS) 1 G61 , cylinder bank 1
2. 3-pin harness connector for Knock Sensor (KS) 2 G66 , cylinder bank 2

Scheme 801

1 - Intake Manifold Change-Over Valve N156

1. Activation for both vacuum diaphragms

2 - Intake manifold change-over valve vacuum diaphragm

3 - Intake Air Switch-over valve N335

1. Activation for flap in air filter

a - T-connector for vacuum supply from intake manifold change-over valve

b - Vacuum supply from intake manifold

c - Vacuum line to low pressure reservoir (vacuum reservoir)

d - T-connector for vacuum supply from Intake Air Switch-over valve N335 and low pressure reservoir