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Ignition/glow Plug System - 3.0l Avk Audi A4 B6

Ignition System 39 illustrations ~4487 words

General notes on ignition system

  1. Switch off the ignition before connecting or disconnecting the battery, otherwise the engine control module may be damaged.
  2. A voltage of at least 12.7 V is necessary for satisfactory functioning of the electrical components.
  3. During some of the tests, a malfunction may be recognized and stored by the control module. At the end of all tests and repairs, the DTC memory should be checked and, erased.
  4. If the engine starts and then stops after malfunction search, repair or tests on components, because the immobilizer is blocking the engine control module. The DTC memory must then be checked and, if necessary, the control module adapted.
WARNINGSafety precautions before disconnecting battery: See BATTERY DISCONNECT PRECAUTIONS . Always switch ignition off before disconnecting or connecting battery. Failure to do so may damage a control module.

Safety precautions

To prevent injuries to persons and/or damage to the fuel injection and ignition system, observe the following

  1. Do not touch or disconnect ignition wiring when the engine is running or at starting speed.
  2. The ignition must be switched off before connecting or disconnecting ignition system wiring. This also applies to high-voltage cables and measuring instrument leads.
  3. In order to run engine at starting speed without actually starting it (for example, in order to test compression), unplug connector from the output stage of the ignition coils and also the connectors on the injectors.
  4. In the case of some tests, a DTC may be recognized and stored by the control module. At the end of all tests and repairs, the DTC memory should be checked and, if necessary, erased. After erasing the DTC memory the readiness code must be produced. See «READINESS CODE, GENERATING»(/audi/a4/b6-2000-2006/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-30l-avk) .
  5. Always switch off the ignition before washing the engine.
  6. Always switch off the ignition before connecting or disconnecting the battery, otherwise the engine control module may be damaged.

Technical data for ignition system

Engine codesAVK (3.0 L / 5V / 162 kW-engine)
Idle speed Engine speed cannot be adjusted, it is regulated by idle stabilization700 to 800 RPM (1)
Engine speed (RPM) limitation Via fuel injector shut-offApprox. 6800 RPM
Ignition timing is determined in the control module It is not possible to adjust the ignition timing
Ignition systemIndividual coil ignition system with 6 ignition coils (power output stages integrated) that are connected directly to spark plugs via the ignition cables.
Spark plugs (2)Tightening torque 30 N.m
Ignition sequence1-4-3-6-2-5
(1) Depending on engine oil temperature / transmission oil temperature (automatic transmission 01J) an engine speed increase up to 980 rpm is possible. (2) Current values: See SPARK PLUGS, REPLACING .
(1)Depending on engine oil temperature / transmission oil temperature (automatic transmission 01J) an engine speed increase up to 980 rpm is possible.
(2)Current values: See SPARK PLUGS, REPLACING

TECHNICAL DATA FOR IGNITION SYSTEM CHART

Special tools and equipment

  1. VAG1526 A
  2. VAG1527 B
  3. VAG1594 A
  4. VAG1598/31

Test sequence

Note. The ignition coil and the output stage are combined in a common component.

Identify an inoperative or misfiring cylinder as follows

  1. Test misfire detection. See «MISFIRE DETECTION, CHECKING»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-30l-avk) . If misfires are detected
  2. Continue checking indicated cylinder if faulty cylinder has been detected. If no misfires were detected
  3. Disconnect connectors from injectors in sequence with engine running, and observe how engine runs. or
  4. Compare spark plugs of all cylinders with each other and check for carbon on electrodes. If the faulty cylinder has been identified
  5. Replace spark plug of faulty cylinder with one from another cylinder. If the malfunction moves with the spark plug
  6. Replace spark plug. If the malfunction remains in the same cylinder
  7. Replace ignition coil from faulty cylinder with one from another cylinder. If the malfunction moves with the ignition coil
  8. Replace ignition coil.

Scheme 43

Scheme 43: Test Ground connection
Scheme 43: Test Ground connection
  1. Disconnect cover -1- on left in engine compartment.
  2. Unbolt coolant expansion tank (arrow).
  3. Disconnect electrical wiring to Engine Coolant Level (ECL) warning switch -F66- on bottom of expansion tank.
  4. Lay coolant expansion tank with connected coolant hoses -1- to - 3- aside.
  5. Disconnect cover -1- on right in engine compartment.
  6. Remove bolts (arrows).
  7. Disconnect solenoid valve for Evaporative Emission (EVAP) canister purge -N80- -1- from air duct.
  8. Remove air duct -2-.
  9. Remove air filter housing (arrows).
  10. Disconnect connector -1- at mass air flow sensor.
  11. Remove air duct hose -2- together with mass air flow sensor.
  12. Remove bolts (arrows) on right cylinder head.
  13. Disconnect 4-pin connectors -1- to -3- on ignition coils.
  14. Remove bolts (arrows) on left cylinder head.
  15. Disconnect 4-pin connectors -4- to -6- on ignition coils.
  16. Connect voltage tester VAG1527 B as follows: CONNECTOR TERMINAL 2 & 4 VOLTAGE REFERENCE Connector terminal Measure to 2 Battery positive 4 Battery positive LED should illuminate. If the LED does not illuminate
  17. Check wiring connections. See appropriate System Wiring Diagram article.

If the LED illuminates

Test requirements

  1. Fuses for engine electronics OK See appropriate System Wiring Diagram article.

Scheme 44

Scheme 44
Scheme 44
  1. Connect multimeter as follows to measure voltage: CONNECTOR TERMINAL 1 VOLTAGE REFERENCE Connector terminal Measure to 1 Engine ground
  2. Switch ignition on. Specified value: approx. battery voltage If specified value is attained
  3. Check actuation of power output stages. See «CHECKING ACTUATION OF POWER OUTPUT STAGES»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-30l-avk__checking-actuation-of-power-output-stages) . If specified value is not attained
  4. Pull off rubber seal of plenum chamber cover.
  5. Remove plenum chamber cover -1- toward front (arrows).
  6. Pry off both trim caps -3- with a screwdriver.
  7. Undo hex nuts -4- a few turns.
  8. Release wiper arms -2- from pivot shaft by tilting them slightly.
  9. Remove hex nuts completely and remove wiper arms.
  10. Disconnect retaining clips -1- and remove air cowl grille -5-.
  11. Remove cover for electronics box (plenum chamber) (arrows).
  12. Lift off engine control module retaining clip using a screwdriver (arrow) and move control module to side.
  13. If installed, unclip transmission control module retaining clip and place control module on one side.
  14. Disconnect power supply relay -2-.
  15. Perform following tests (marked with dots): Check the wiring of relay carrier, electronics box, plenum chamber, position 2, terminal 8, to connector of ignition coil terminal 1. Check power supply relay for Motronic Engine Control Module (ECM) power supply relay -J271-. See «MOTRONIC ENGINE CONTROL MODULE (ECM) POWER SUPPLY RELAY -J271-, CHECKING»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-30l-avk) .

Checking actuation of power output stages

  1. Connectors disconnected from ignition coils

Scheme 45

Scheme 45
Scheme 45
  1. Disconnect connectors from all injectors. NOTE: It is important to make sure that no fuel is injected during the test, as this would damage the catalytic converter. The connectors on the injectors must be disconnected.
  2. Connect voltage tester VAG1527 B to terminals 2 and 3 of connector.
  3. Operate starter briefly. LED test light should flash (very brief flashes). If LED does not flash
  4. Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. See «WIRING AND COMPONENT CHECK WITH TEST BOX VAG 1598/31»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__wiring-and-component-check-with-test) .
  5. Check for open circuit and short to positive or ground in following wiring connections: IGNITION COIL CONNECTOR TERMINAL 3, SOCKETS 102, 110, 94, 103, 111, 95 Connector terminal Test box VAG1598/31 Socket 3 (cyl. 1) 102 3 (cyl. 2) 110 3 (cyl. 3) 94 3 (cyl. 4) 103 3 (cyl. 5) 111 3 (cyl. 6) 95
  6. Repair any open/short circuit as necessary. If no wiring malfunction is detected
  7. Replace common component ignition coil with power output stage.
  1. VAG1526 A
  2. VAG1594 A
  3. VAG1598/31

Note. The Motronic engine control module (ECM) power supply relay -J271- supplies the ignition coils with output stages as well as the engine control module on Pin 121 with power.

Scheme 46

Scheme 46: Test sequence
Scheme 46: Test sequence

Scheme 47

Scheme 47
Scheme 47
  1. Disconnect cover -1- on left in engine compartment.
  2. Unbolt coolant expansion tank (arrow).
  3. Disconnect electrical wiring to Engine Coolant Level (ECL) warning switch -F66- on bottom of expansion tank.
  4. Lay coolant expansion tank with connected coolant hoses -1- to -3- aside.
  5. Remove bolts (arrows) on left cylinder head.
  6. Disconnect 4-pin connectors -4- to -6- on ignition coils. NOTE: For further testing, the multimeter is attached to an ignition coil connector.
  7. Connect multimeter as follows to measure voltage. IGNITION COIL POWER OUTPUT STAGE CONNECTOR TERMINAL 1 VOLTAGE REFERENCE Connector terminal Measure to 1 Engine ground
  8. Switch ignition on. Specified value: approx. battery voltage If specified value is not attained
  9. Switch ignition off.
  10. Pull off rubber seal of plenum chamber cover.
  11. Remove plenum chamber cover -1- toward front (arrows).
  12. Pry off both trim caps -3- with a screwdriver.
  13. Undo hex nuts -4- a few turns.
  14. Release wiper arms -2- from pivot shaft by tilting them slightly.
  15. Remove hex nuts completely and remove wiper arms.
  16. Disconnect retaining clips -1- and remove air cowl grille -5-.
  17. Remove cover for electronics box (plenum chamber) (arrows).
  18. Lift off engine control module retaining clip using a screwdriver (arrow) and move control module to side.
  19. If installed, unclip transmission control module retaining clip and place control module on one side.
  20. Disconnect power supply relay -2-.
  21. Check for open circuit in following wiring according to wiring diagram: IDENTIFYING TERMINAL 1 & 8 SPECIFICATIONS (ECM POWER SUPPLY RELAY) Relay carrier in electronics box, plenum chamber, position 2 terminal Connection of ignition coils terminal 8 1
  22. Repair open circuit, if necessary. If no wiring malfunction is detected
  23. Check voltage supply of Motronic Engine Control Module (ECM) power supply relay -J271-. See «CHECKING POWER SUPPLY»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-30l-avk) .
  24. Check actuation of Motronic Engine Control Module (ECM) power supply relay -J271-. See «CHECKING ACTUATION»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-30l-avk__checking-actuation) .

Scheme 48

Scheme 48: Checking power supply
Scheme 48: Checking power supply
  1. Connect multimeter as follows to measure voltage. CONNECTOR TERMINAL 1 & 2 REFERENCE (ECM POWER SUPPLY RELAY) Relay carrier in electronics box, plenum chamber, position 2 terminal Measure to 1 Engine ground 2 Engine ground Specified value: approx. battery voltage If specified value is not attained
  2. Check wiring connections. See appropriate System Wiring Diagram article.

Scheme 49

Scheme 49: Checking actuation
Scheme 49: Checking actuation

Scheme 50

Scheme 50
Scheme 50
  1. Connect multimeter as follows to measure voltage. CONNECTOR TERMINAL 4 REFERENCE (ECM POWER SUPPLY RELAY) Relay carrier in electronics box, plenum chamber, position 2 terminal Measure to 4 Battery positive
  2. Switch ignition on. Specified value: approx. battery voltage If specified value is not attained
  3. Switch ignition off.
  4. Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. See «WIRING AND COMPONENT CHECK WITH TEST BOX VAG 1598/31»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__wiring-and-component-check-with-test) .
  5. Check for open circuit and short to positive or ground in following wiring connection: CONNECTOR TERMINAL 4, SOCKET 23 REFERENCE (ECM POWER SUPPLY RELAY) Relay carrier in electronics box, plenum chamber, position 2 terminal Test box V.A.G 1598/31 Socket 4 23
  6. Repair any open/short circuit as necessary. If no malfunction is found
  7. Replace Motronic Engine Control Module (ECM) power supply relay -J271-.
  1. VAG1526 A
  2. VAG1594 A
  3. VAG1598/31

Note. The engine speed sensor is a combined speed sensor and reference mark sensor. The engine cannot be started without a signal from the Engine speed (RPM) sensor -G28-. If the signal from the Engine speed (RPM) sensor -G28- fails while the engine is running, the engine will cut out immediately.

Scheme 51

Scheme 51: Test sequence
Scheme 51: Test sequence

Scheme 52

Scheme 52
Scheme 52

Scheme 53

Scheme 53
Scheme 53
  1. Before performing test, make sure that sensor is correctly installed and firmly seated.
  2. Disconnect connector to engine speed sensor. See «IDENTIFICATION OF CONNECTOR BRACKET - LEFT SIDE OF VEHICLE»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__identification-of-connector-bracket-left) .
  3. Connect multimeter between terminals 2 and 3 to measure resistance. Specified value: 730 to 1000 ohm NOTE: The resistance value of the engine speed sensor is associated with a temperature of 20 °C. The resistance increases if the temperature increases. If specified value is not attained
  4. Install a new engine speed sensor. If specified value is attained
  5. Connect multimeter between terminals 2 and 1 (screen) and 3 and 1 (screen) to measure resistance. Specified value: each case INFINITY ohm (no continuity) If specified value is not attained
  6. Install a new engine speed sensor. If specified value is attained
  7. Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. See «WIRING AND COMPONENT CHECK WITH TEST BOX VAG 1598/31»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__wiring-and-component-check-with-test) .
  8. Check for open circuit and short to positive or ground in following wiring connections: CONNECTOR TERMINAL 1, 2, 3 & SOCKET 108, 90, 82 (ENGINE SPEED SENSOR) Connector terminal Test box VAG1598/31 Socket 1 (screening) 108 2 (ground) 90 3 (signal) 82
  9. Repair any open/short circuit as necessary. If no wiring malfunction is detected
  10. Replace engine control module. See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__engine-control-module-ecm-without-metal) .
  1. VAG1526 A
  2. VAG1594 A
  3. VAG1598/31
  4. VAS5051 with VAS5051/1

Note. The Intake Air Temperature (IAT) sensor -G42- is integrated in the Mass Air Flow (MAF) sensor -G70-.

Scheme 54

Scheme 54: Test sequence
Scheme 54: Test sequence
  1. Connect testing and information system VAS5051. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS5051, CONNECTING AND SELECT FUNCTIONS»(/audi/a4/b6-2000-2006/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-30l-avk) . Select vehicle system "01 - Engine electronics" in selection. Engine must be running at idling speed. Display on VAS5051
  2. Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS5051

Scheme 55

Scheme 55
Scheme 55

1 - Enter display group

  1. Enter "004" for "display group number 004" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

Scheme 56

Scheme 56
Scheme 56
  1. Check indication in display field -4-.
Display zones
1234
Display group 004: Intake air temperature with engine idling
DisplayXxxx rpmXx.x VXxx.x °CXxx.x °C
DisplayEngine speedBattery voltageCoolant temperatureIntake air temperature
Range48.0 to 143.0 °C
Specif. valueXxxx rpm12.0 to 15.0 V80.0 to 110.0 °CBetween ambient temperature and up to 110 °C (1)
(1) If a temperature is displayed which deviates greatly from the ambient temperature of the sensor, check sensor and sensor wiring for terminal resistances and open circuit.
(1)If a temperature is displayed which deviates greatly from the ambient temperature of the sensor, check sensor and sensor wiring for terminal resistances and open circuit.

DISPLAY GROUP 004: INTAKE AIR TEMPERATURE WITH ENGINE IDLING

  1. Exit function "08 - Read measured value block" by pressing [left arrow] button.

Scheme 57

Scheme 57: Checking wiring
Scheme 57: Checking wiring
  1. Disconnect connector (arrow) to mass air flow sensor.
  2. Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. See «WIRING AND COMPONENT CHECK WITH TEST BOX VAG 1598/31»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__wiring-and-component-check-with-test) .
  3. Check for open circuit and short to positive or ground in following wiring connection: CONNECTOR TERMINAL 5, SOCKET 26 (IAT SENSOR) Connector terminal Test box VAG1598/31 Socket 5 26
  4. Repair any open/short circuit as necessary.
  5. Check all wires for short to one another. If no wiring malfunction is detected
  6. Replace Mass Air Flow (MAF) sensor -G70-.
  1. VAG1526 A
  2. VAG1594 A
  3. VAG1598/31
  4. VAS5051 with VAS5051/1

Installation location. See COMPONENT LOCATIONS, OVERVIEW .

  1. Engine cold
  1. Connect testing and information system VAS5051. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS5051, CONNECTING AND SELECT FUNCTIONS»(/audi/a4/b6-2000-2006/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-30l-avk) . Select vehicle system "01 - Engine electronics" in selection. Engine must be running at idling speed.

Display on VAS5051

Scheme 58

Scheme 58
Scheme 58
  1. Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS5051

Scheme 59

Scheme 59
Scheme 59

1 - Enter display group

  1. Enter "004" for "display group number 004" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

Scheme 60

Scheme 60
Scheme 60
  1. Check indication in display field -3-.
Display zones
1234
Display group 004: Coolant temperature with engine idling
DisplayXxxx rpmXx.x VXxx.x °CXxx.x °C
DisplayEngine speedBattery voltageCoolant temperatureIntake air temperature
Range48.0 to 143.0 °C
Specif. valueXxxx rpm12.0 to 15.0 VThe temperature reading should increase evenlyFrom ambient temperature up to 110 °C

DISPLAY GROUP 004: COOLANT TEMPERATURE WITH ENGINE IDLING

If display zone 3 shows an implausible value

  1. Disconnect connector -2- at Engine Coolant Temperature (ECT) sensor -G2-/-G62-.
  2. Connect multimeter between terminals C and D of sensor to measure resistance.

Range A shows resistance values for temperature range 0 to 50 °C and range B shows the values for temperature range 50 to 100 °C.

Sample readings

  1. 30 °C corresponds to a resistance of 1500 to 2000 ohm
  2. 80 °C corresponds to a resistance of 275 to 375 ohm

If specified value is not attained

  1. Replace engine coolant temperature sensor.

If specified value is attained

Scheme 61

Scheme 61
Scheme 61
  1. Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. See «WIRING AND COMPONENT CHECK WITH TEST BOX VAG 1598/31»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__wiring-and-component-check-with-test) .
  2. Check for open circuit and short to positive or ground in following wiring connections: CONNECTOR TERMINAL 3, 4 & SOCKET 108, 93 (ECT SENSOR) Connector terminal Test box VAG1598/31 Socket 3 108 4 (signal) 93
  3. Test for short circuits between two wires.
  4. Repair any open/short circuit as necessary. If no wiring malfunction is detected
  5. Replace engine control module. See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__engine-control-module-ecm-without-metal) .
  1. VAG1526 A
  2. VAG1594 A
  3. VAG1598/31
  1. Fuses for engine electronics OK See appropriate System Wiring Diagram article.
  2. Battery voltage at least 12.7 V
  3. Alternator OK
  1. Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. See «WIRING AND COMPONENT CHECK WITH TEST BOX VAG 1598/31»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__wiring-and-component-check-with-test) .
  2. Switch ignition on. NOTE: The positive voltage supply to the engine control module is provided via terminal 3 (terminal 15) and terminal 62 (terminal 30). The ground connection to the engine control module is provided via terminal 1 and terminal 2.
  3. Connect multimeter as follows to measure voltage: SOCKETS 1, 2 & 62 VOLTAGE REFERENCE (ECM POWER SUPPLY) Test box VAG1598/31 Socket Measure to 1 Battery positive 2 Battery positive 62 Engine ground Specified value: approx. battery voltage
  4. Connect multimeter as follows to measure voltage: SOCKET 3 VOLTAGE REFERENCE (ECM POWER SUPPLY) Test box VAG1598/31 Socket Measure to 3 Engine ground
  5. Switch ignition on. Specified value: approx. battery voltage If the specified values are not obtained
  6. Check wiring connections. See appropriate System Wiring Diagram article.
  7. Connect multimeter as follows to measure voltage: SOCKET 121 VOLTAGE REFERENCE (ECM POWER SUPPLY) Test box VAG1598/31 Socket Measure to 121 (1) Engine ground (1) The Motronic Engine Control Module (ECM) power supply relay -J271- carries voltage on terminal 121 of engine control modules after switching off the ignition for up to 15 minutes.
  8. Switch ignition on. Specified value: approx. battery voltage If specified value is not attained
  9. Check wiring connections. See appropriate System Wiring Diagram article.
  10. Check Motronic Engine Control Module (ECM) power supply relay -J271-. See «MOTRONIC ENGINE CONTROL MODULE (ECM) POWER SUPPLY RELAY -J271-, CHECKING»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-30l-avk) .

Knock control stop, checking

If a malfunction entry relating to "knock control stop reached" is made, perform the following checks

  1. VAS5051 with VAS5051/1
  1. Connect testing and information system VAS5051. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS5051, CONNECTING AND SELECT FUNCTIONS»(/audi/a4/b6-2000-2006/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-30l-avk) . Select vehicle system "01 - Engine electronics" in selection. Engine must be running at idling speed.

Display on VAS5051

Scheme 62

Scheme 62
Scheme 62
  1. Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS5051

Scheme 63

Scheme 63
Scheme 63

1 - Enter display group max. input value = 255

  1. Enter "020" for "display group number 020" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

Scheme 64

Scheme 64
Scheme 64
  1. Check indication in display fields -1- to -4-.
Display zones
1234
Display group 020: Ignition knock control during driving
DisplayXx.x ° CAXx.x ° CAXx.x ° CAXx.x ° CA
DisplayIgnition angle retardation cylinder 1 through Knock controlIgnition angle retardation cylinder 2 through Knock controlIgnition angle retardation cylinder 3 through Knock controlIgnition angle retardation cylinder 4 through Knock control
Specif. value0 to 12 ° CA0 to 12 ° CA0 to 12 ° CA0 to 12 ° CA
NoteEvaluation. See Evaluation of ignition angle retardation .

DISPLAY GROUP 020: IGNITION KNOCK CONTROL DURING DRIVING

Note. The numbers displayed in display zones 1 to 4 represent the actual ignition timing retardation due to the knock control of the individual cylinders. The ignition angle retardation is carried out late in ° CA (crankshaft degrees).

  1. To change to display group 021, Press up button.

Display on VAS5051

Scheme 65

Scheme 65
Scheme 65
  1. Check indication in display fields -1- and -2-.
Display zones
1234
Display Group 021: Ignition knock control during driving
DisplayXx.x ° CAXx.x ° CA
DisplayIgnition angle retardation cylinder 5 through Knock controlIgnition angle retardation cylinder 6 through Knock control
Specif. value0...12 ° CA0...12 ° CA
NoteEvaluation. See Evaluation of ignition angle retardation .

DISPLAY GROUP 021: IGNITION KNOCK CONTROL DURING DRIVING

Note. The numbers displayed in display zones 1 and 2 represent the actual ignition timing retardation due to the knock control of the individual cylinders. The ignition angle retardation is carried out late in ° CA (crankshaft degrees).

  1. Exit function "08 - Read measured value block" by pressing [left arrow] button.

Evaluation of ignition angle retardation

Indicated on displayPossible causes of malfunctionCorrective action
All cylinders greater than 12 ° CAKnock sensor faultyCheck knock sensor. See KNOCK SENSORS, CHECKING .
Connector corroded
Knock sensor incorrectly tightenedLoosen knock sensor and tighten to 20 N.m.
Loose components on engineSecure components
Poor fuel qualityChange fuel quality (see operating instructions)
One cylinder deviates significantly from the othersConnector corrodedCheck knock sensor. See KNOCK SENSORS, CHECKING .
Engine malfunctionCheck compression: See COMPRESSION PRESSURE, CHECKING .
Loose components on engineSecure components

EVALUATION OF IGNITION ANGLE RETARDATION DIAGNOSIS

  1. VAG1526 A
  2. VAG1594 A
  3. VAG1598/31

Testing knock sensor wiring

Note. The Knock Sensor (KS) 1 -G61- and Engine Coolant Temperature (ECT) sensor -G62- cannot be tested by themselves electrically. Use only gold-plated terminals when repairing the cable connectors for the knock sensors. Make sure that the knock sensors function properly it is important to keep to the specified tightening torque of 20 N.m. Check connector between knock sensor and wiring harness for corrosion.

  1. Disconnect connector of relevant knock sensor. See «IDENTIFICATION OF CONNECTOR BRACKET - RIGHT SIDE OF VEHICLE»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__identification-of-connector-bracket-right) or «IDENTIFICATION OF CONNECTOR BRACKET - LEFT SIDE OF VEHICLE»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__identification-of-connector-bracket-left) .
  2. Test for short between all three terminals in knock sensor connector (terminals 1 + 2, 1 + 3, 2 + 3). Specified value: INFINITY ohm (no continuity) - the wires must not be connected to each other.
  3. If there is a connection between terminals, install a new knock sensor. If no malfunction is found

Scheme 66

Scheme 66: Checking wiring from knock sensors to engine control module
Scheme 66: Checking wiring from knock sensors to engine control module
  1. Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. See «WIRING AND COMPONENT CHECK WITH TEST BOX VAG 1598/31»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__wiring-and-component-check-with-test) .
  2. Check for open circuit and short to ground/positive or ground in following wiring connections: Knock Sensor (KS) 1 -G61- (Bank 1) CONNECTOR TERMINAL CHECKING - KNOCK SENSOR 1 Connector terminal Test box VAG1598/31 Socket 1 (signal) 106 2 (ground) 99 3 (screening) 108 Knock Sensor (KS) 2 -G66- (Bank 2) CONNECTOR TERMINAL CHECKING - KNOCK SENSOR 2 Connector terminal Test box VAG1598/31 Socket 1 (signal) 107 2 (ground) 99 3 (screening) 108
  3. Repair any open/short circuit as necessary.
  1. VAG1526 A
  2. VAG1527 B
  3. VAG1594 A
  4. VAG1598/31
  5. VAS5051 with VAS5051/1

Checking actuation

Installation location. See COMPONENT LOCATIONS, OVERVIEW .

Note. To gain access to the connectors on cylinder bank 2 (left), you must remove the cover on left of engine compartment, disconnect cable to coolant shortage indicator switch at bottom of expansion tank, remove screw (arrow) for coolant expansion tank and lay aside. Coolant hoses -1 to 3 - do not have to be disconnected.

Scheme 67

Scheme 67: Checking actuation
Scheme 67: Checking actuation
  1. Connect voltage tester VAG1527 B with measuring probes and plug-in adapters from VAG1594 A between terminal 2 (CMP sensor signal) and terminal 1 (positive); connector remains plugged in. NOTE: Receptacles are numbered accordingly on the back of the connector.
  2. Operate starter for a few seconds. LED should flash. NOTE: Voltage testers with a low current consumption continue to glow faintly between actuation from the engine control module (rather than extinguishing completely) and become much brighter when actuated.

If LED does not flash

Scheme 68

Scheme 68: Checking power supply
Scheme 68: Checking power supply
  1. Disconnect connectors -1- and -2- on Camshaft Position (CMP) sensor -G40- and Camshaft Position (CMP) sensor 3 -G300-.
  2. Disconnect connectors -1- and -2- on Camshaft Position (CMP) sensor 2 -G163- and Camshaft Position (CMP) sensor 4 -G301-.
  3. Connect multimeter as follows to measure voltage: CONNECTOR TERMINAL 1 VOLTAGE REFERENCE (CMP SENSOR) Connector terminal Measure to 1 Engine Ground
  4. Switch ignition on. Specified value: approx. 5 V

Scheme 69

Scheme 69: Checking signal wire
Scheme 69: Checking signal wire
  1. Connect multimeter as follows to measure voltage: CONNECTOR TERMINAL 2 VOLTAGE REFERENCE (CMP SENSOR) Connector terminal Measure to 2 Engine ground
  2. Switch ignition on. Specified value: approx. battery voltage

Scheme 70

Scheme 70: Checking ground wire
Scheme 70: Checking ground wire
  1. Connect multimeter as follows to measure voltage: CONNECTOR TERMINAL 3 VOLTAGE REFERENCE (CMP SENSOR) Connector terminal Measure to 3 Battery positive Specified value: approx. 10 V
  2. Repair any open/short circuit as necessary. If the specified values are all achieved and the LED test light does not flash (measured between terminals 1 and 2 with starter connector attached)
  3. Install a new CMP sensor. If the specified values are not obtained

Scheme 71

Scheme 71: Checking wiring between CMP sensor and engine control module
Scheme 71: Checking wiring between CMP sensor and engine control module

Scheme 72

Scheme 72
Scheme 72
  1. Connect test box VAG1598/31 to wiring harness for engine control module; do not connect engine control module. See «WIRING AND COMPONENT CHECK WITH TEST BOX VAG 1598/31»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-30l-avk__wiring-and-component-check-with-test) .
  2. Check for open circuit and short to positive or ground in following wiring connections: Camshaft Position (CMP) sensor -G40- (Bank 1) CONNECTOR TERMINAL CHECKING - CAMSHAFT POSITION SENSOR, -G40- BANK 1 Connector terminal Test box VAG1598/31 Socket 1 (positive) 98 2 (signal) 87 3 (ground) 108 Camshaft Position (CMP) sensor 2 -G163- (Bank 2) CONNECTOR TERMINAL CHECKING - CAMSHAFT POSITION SENSOR 2, G163 BANK 2 Connector terminal Test box VAG1598/31 Socket 1 (positive) 98 2 (signal) 86 3 (ground) 108 Camshaft Position (CMP) sensor 3 -G300- (Bank 1) CONNECTOR TERMINAL CHECKING - CAMSHAFT POSITION SENSOR 3, G300 BANK 1 Connector terminal Test box VAG 1598/31 Socket 1 (positive) 98 2 (signal) 81 3 (ground) 108 Camshaft Position (CMP) sensor 4 -G301- (Bank 2) CONNECTOR TERMINAL CHECKING - CAMSHAFT POSITION SENSOR 4, G301- BANK 2 Connector terminal Test box VAG 1598/31 Socket 1 (positive) 98 2 (signal) 54 3 (ground) 108
  3. Repair any open/short circuit as necessary.

Check phase position of CMP sensor

  1. Connect testing and information system VAS5051. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS5051, CONNECTING AND SELECT FUNCTIONS»(/audi/a4/b6-2000-2006/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-30l-avk) . Select vehicle system "01 - Engine electronics" in selection. Engine must be running at idling speed.

Display on VAS5051

Scheme 73

Scheme 73
Scheme 73
  1. Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS5051

Scheme 74

Scheme 74
Scheme 74

1 - Enter display group

  1. Enter "093" for "display group number 093" in zone -2- and confirm entry by pressing -Q- button.

Display on VAS5051

Scheme 75

Scheme 75
Scheme 75
  1. Check indication in display fields -1- to -4-. DISPLAY GROUP 093: PHASE LOCATIONS OF CMP SENSORS (BANK 1 AND BANK 2), ENGINE IDLING Display zones 1 2 3 4 Display group 093: Phase locations of CMP sensors (bank 1 and bank 2), engine idling Display ° CA ° CA ° CA ° CA Display Phase location, intake bank 1 Phase location, intake bank 2 Phase location, exhaust bank 1 Phase location, exhaust bank 2 Specif. value -20...32 ° CA -20...32 ° CA -20...32 ° CA -20...32 ° CA Note: If the specified values are exceeded significantly in the two CMP sensors of one cylinder bank, the connectors for the CMP sensors of that cylinder bank are interchanged. If the specified values for one CMP sensor are exceeded, check CMP sensor and camshaft adjustment. See «CAMSHAFT ADJUSTMENT, CHECKING»(ref-197058-S33337724442005101100000) .
  2. Exit function "08 - Read measured value block" by pressing [left arrow] button.
  1. VAS5051 with VAS5051/1

Scheme 76

Scheme 76: Test sequence
Scheme 76: Test sequence

Scheme 77

Scheme 77
Scheme 77

Scheme 78

Scheme 78
Scheme 78

Scheme 79

Scheme 79
Scheme 79
  1. Connect testing and information system VAS5051. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS5051, CONNECTING AND SELECT FUNCTIONS»(/audi/a4/b6-2000-2006/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-30l-avk) . Select vehicle system "01 - Engine electronics" in selection. Engine must be running at idling speed. Indicated on display
  2. Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press Q button to confirm input. Indicated on display
  3. Press buttons -0-, -1- and -4- to input "display group number 14" and press Q button to confirm input. Indicated on display
  4. Check misfire detection. DISPLAY GROUP 014: MISFIRE DETECTION Display zones 1 2 3 4 Display group 014: Misfire detection Display xxx rpm xxx% xxx - Display Engine speed Load Total misfires Misfire detection Range min.: 550 RPM max.: 7200 RPM min.: 0 max.: 100 activated not activated Specif. value 600 to 820 RPM xx.x% 0 to 5 activated Note: - - If the specified value is not reached: Evaluation display field 3. See «EVALUATING DISPLAY GROUPS 014, 015 AND 016, DISPLAY FIELD 3»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-30l-avk__evaluating-display-groups-014-015-and) . - If the specified value is reached
  5. Press --> button. Indicated on display (function selection): If specified value is not attained
  6. To change to display group 015, Press up button.

Checking misfire recognition of the individual cylinder

Display on VAS5051

Scheme 80

Scheme 80: Checking misfire recognition of the individual cylinder
Scheme 80: Checking misfire recognition of the individual cylinder

Scheme 81

Scheme 81
Scheme 81
  1. Check indication in display fields -1- to -4-. DISPLAY GROUP 015: MISFIRE DETECTION OF CYLINDERS 1, 2 AND 3 Display zones 1 2 3 4 Display group 015: Misfire detection of cylinders 1, 2 and 3 Display xxx xxx xxx - Display Number of misfires in cylinder 1 Number of misfires in cylinder 2 Number of misfires in cylinder 3 Misfire detection Range activated blocked Specif. value 0 0 0 activated Note: If nominal value is exceeded: Evaluation. See «EVALUATING DISPLAY GROUPS 014, 015 AND 016, DISPLAY FIELD 3»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-30l-avk__evaluating-display-groups-014-015-and) .
  2. To change to display group 016, Press up button. Display on VAS5051
  3. Check indication in display fields -1- to -4-. DISPLAY GROUP 016: MISFIRE DETECTION OF CYLINDERS 4, 5 AND 6 Display zones 1 2 3 4 Display group 016: Misfire detection of cylinders 4, 5 and 6 Display xxx xxx xxx - Display Number of misfires in cylinder 4 Number of misfires in cylinder 5 Number of misfires in cylinder 6 Misfire detection Range activated blocked Specif. value 0 0 0 activated Note: If nominal value is exceeded: Evaluation. See «EVALUATING DISPLAY GROUPS 014, 015 AND 016, DISPLAY FIELD 3»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-30l-avk__evaluating-display-groups-014-015-and) .
  4. Exit function "08 - Read measured value block" by pressing [left arrow] button.

Evaluating display groups 014, 015 and 016, Display field 3

Display field: 3Possible causeCorrective action
Greater than 5Spark plug faulty Spark plug connector faulty Ignition coil or power output stageCheck spark plugs and ignition wires with connector Check ignition coils with output stages. See IGNITION COILS WITH OUTPUT STAGES, CHECKING .
Fuel injector faultyCheck fuel injectors. See FUEL INJECTORS, CHECKING .
Crankshaft housing leakingCheck hose setup of crankcase ventilation for secure seating and for proper seal
Check compression

EVALUATING DISPLAY GROUPS 014, 015 AND 016, DISPLAY FIELD 3

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