Ignition/glow Plug System - 3.0l v6 Avk Audi A6 C5 рестайлинг

General notes

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.

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), Disconnect 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/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-30l-v6-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

TECHNICAL DATA SPECIFICATIONS

Scheme 45

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. Check misfire detection. See «MISFIRE DETECTION, CHECKING»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-30l-v6-avk) .

If misfires are detected

1. Continue checking indicated cylinder if faulty cylinder has been identified.

If no misfires were detected

1. Disconnect connectors from injectors in sequence with engine running, and observe how engine runs. or
2. Compare spark plugs of all cylinders with each other and check for carbon on electrodes.

If the faulty cylinder has been identified

1. Replace spark plug of faulty cylinder with one from another cylinder.

If the malfunction moves with the spark plug

1. Replace spark plug.

If the malfunction remains in the same cylinder

1. Replace ignition coil from faulty cylinder with one from another cylinder.

If the malfunction moves with the ignition coil

1. Replace ignition coil.

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

1. Remove 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 cover -1- on right in engine compartment.
6. Remove bolts (arrows). (Scheme 49)
7. Remove air duct -1-.
8. Disconnect EVAP canister purge regulator valve -N80- -1- from air duct.
9. Remove air filter housing (arrows).
10. Remove bolts (arrows) on right cylinder head.
11. Disconnect 4-pin connectors -1 to 3- on ignition coils.
12. Remove bolts (arrows) on left cylinder head.
13. Disconnect 4-pin connectors -4 to 6- on ignition coils.
14. Connect voltage tester VAG1527 B as follows: IGNITION COIL CIRCUIT TEST: GROUND CONNECTION Connector terminal Measure to 2 Battery positive 4 Battery positive LED should illuminate.

If the LED does not illuminate

1. Check wiring connections.

If the LED illuminates

Scheme 54

1. Fuses for engine electronics OK

1. Connect multimeter as follows to measure voltage: IGNITION COIL CIRCUIT TEST: POWER SUPPLY Connector terminal Measure to 1 Engine ground
2. Switch ignition on. Specified value: approx. battery voltage

If specified value is obtained

1. Check actuation of output stages. See «CHECKING ACTUATION OF POWER OUTPUT STAGES»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-30l-v6-avk__checking-actuation-of-power-output-stages) .

If specified value is not obtained

Scheme 55

Scheme 56

Scheme 57

Scheme 58

1. Switch ignition off.
2. Pull off rubber seal of plenum chamber cover in direction of arrow.
3. Remove plenum chamber cover -1- toward front (arrows).
4. Remove cover for E-box, plenum chamber (arrows).
5. Pry off engine control module retaining clip using a screwdriver (arrow) and move control module to side.
6. Disconnect voltage supply relay -3-.
7. Perform following tests
8. Check wiring of relay carrier, electronics box, plenum chamber, position 2, terminal 8, to connector of ignition coil terminal 1.
9. Check Motronic Engine Control Module (ECM) power supply relay -J271-. See «MOTRONIC ENGINE CONTROL MODULE (ECM) POWER SUPPLY RELAY -J271-, CHECKING»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-30l-v6-avk) .

Checking actuation of power output stages

1. Connectors Disconnectged from ignition coils

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 Disconnectged.

Scheme 59

1. Connect voltage tester VAG1527 B to terminals 2 and 3 of connector.
2. Operate starter briefly. LED test light should flash (very brief flashes).

If LED does not flash

Scheme 60

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 VAG1598/31»(/audi/a6/c5-2001-2004/remont/cruise-control-systems/#multiport-fuel-injection-mfi-30l-v6-avk__wiring-and-component-check-with-test) .
2. Check for open circuit and short to positive or ground in following wiring connections: IGNITION COIL CIRCUIT TEST: ACTUATION OF POWER OUTPUT STAGES 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
3. Repair any open/short circuit as necessary.

If no wiring malfunction is detected

1. Replace common component ignition coil with power output stage.

Scheme 61

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 power output stages as well as the engine control module on Pin terminal 121 with power.

Scheme 62

Scheme 63

Scheme 64

1. Remove 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.

Scheme 65

1. Connect multimeter as follows to measure voltage. ECM POWER SUPPLY RELAY CIRCUIT TEST: VOLTAGE SUPPLY Connector terminal Measure to 1 Engine ground
2. Switch ignition on. Specified value: approx. battery voltage

If specified value is not obtained

Scheme 66

Scheme 67

Scheme 68

Scheme 69

Scheme 70

1. Switch ignition off.
2. Pull off rubber seal of plenum chamber cover in direction of arrow.
3. Remove plenum chamber cover -1- toward front.
4. Remove cover for electronics box (plenum chamber) (arrows).
5. Pry off engine control module retaining clip using a screwdriver (arrow) and move control module to side.
6. Disconnect power supply relay -3-.
7. Check for open circuit in following wiring according to wiring diagram: ECM POWER SUPPLY RELAY CIRCUIT TEST: OPEN CIRCUIT Relay carrier in electronics box, plenum chamber, position 2 terminal Connection of ignition coils. terminal 8 1
8. Repair open circuit, if necessary.

If no wiring malfunction is detected

1. Check voltage supply of Motronic Engine Control Module (ECM) power supply relay -J171-. See «CHECKING POWER SUPPLY»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-30l-v6-avk) .
2. Check actuation of Motronic ECM power supply relay -J271-. See «CHECKING ACTUATION»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-30l-v6-avk__checking-actuation) .

Scheme 71

1. Connect multimeter as follows to measure voltage. ECM POWER SUPPLY RELAY CIRCUIT TEST: POWER SUPPLY 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 obtained

1. Check wiring connections.

Checking actuation

1. Connect multimeter as follows to measure voltage. ECM POWER SUPPLY RELAY CIRCUIT TEST: ACTUATION 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 obtained

Scheme 72

1. Switch ignition off.
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 VAG1598/31»(/audi/a6/c5-2001-2004/remont/cruise-control-systems/#multiport-fuel-injection-mfi-30l-v6-avk__wiring-and-component-check-with-test) .
3. Check for open circuit and short to positive or short to ground in following wiring connection: ECM POWER SUPPLY RELAY CIRCUIT TEST: OPENS/SHORTS Relay carrier in electronics box, plenum chamber, position 2 terminal Test box V.A.G 1598/31 Socket 4 23
4. Repair any open/short circuit as necessary.

If no malfunction is found

1. Replace Motronic ECM power supply relay -J271-.

Scheme 73

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) -G28- sensor. If the signal from the RPM sensor -G28- fails while the engine is running, the engine will cut out immediately.

Scheme 74

1. Ensure that sensor is correctly installed and firmly seated.
2. Disconnect connector to engine speed sensor. See «COMPONENT LOCATIONS, OVERVIEW»(/audi/a6/c5-2001-2004/remont/cruise-control-systems/#multiport-fuel-injection-mfi-30l-v6-avk__component-locations-overview) .
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 obtained

1. Replace engine speed sensor.

If specified value is obtained

Scheme 75

1. 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 obtained

1. Replace engine speed sensor.

If specified value is obtained

Scheme 76

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 VAG1598/31»(/audi/a6/c5-2001-2004/remont/cruise-control-systems/#multiport-fuel-injection-mfi-30l-v6-avk__wiring-and-component-check-with-test) .
2. Check for open circuit and short to positive or ground in following wiring connections: ENGINE SPEED (RPM) SENSOR CIRCUIT TEST: OPENS/SHORTS Connector terminal Test box VAG1598/31 Socket 1 (screening) 108 2 (ground) 90 3 (signal) 82
3. Repair any open/short circuit as necessary.

If no wiring malfunction is detected

1. Replace engine control module. See «ENGINE CONTROL MODULE (ECM), REPLACING»(/audi/a6/c5-2001-2004/remont/cruise-control-systems/#multiport-fuel-injection-mfi-30l-v6-avk__engine-control-module-ecm-replacing) .

Scheme 77

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-.

1. Connect testing and information system VAS5051. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS5051, CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-30l-v6-avk) . Select vehicle system "01 - Engine electronics". Engine must be running at idling speed.

Display on VAS5051

Scheme 78

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

Display on VAS5051

Scheme 79

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

Display on VAS5051

Scheme 80

1. Check indication in display field -4-. DISPLAY GROUP 004: INTAKE AIR TEMPERATURE WITH ENGINE IDLING Display zones 1 2 3 4 Display group 004: Intake air temperature with engine idling Display xxxx rpm xx.x V xxx.x ° C xxx.x °C Display Engine speed Battery voltage Coolant temperature Intake air temperature Range -48.0 to 143.0 ° C Specif. value xxxx rpm 12.0 to 15.0 V 80.0 to 110.0 ° C Between 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.
2. Exit function "08 - Read measured value block" by pressing --> button.

Scheme 81

Scheme 82

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 VAG1598/31»(/audi/a6/c5-2001-2004/remont/cruise-control-systems/#multiport-fuel-injection-mfi-30l-v6-avk__wiring-and-component-check-with-test) .
3. Check for open circuit and short to positive or short to ground in following wiring connection: MAF SENSOR CIRCUIT TEST: OPENS/SHORTS 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

1. Replace mass air flow (MAF) sensor -G70-.

Scheme 83

1. VAG1526 A
2. VAG1594 A
3. VAG1598/31
4. VAS5051 with VAS5051/1

Installation location, see COMPONENT LOCATIONS, OVERVIEW

Test requirements

1. Engine cold

1. Connect testing and information system VAS5051. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS5051, CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-30l-v6-avk) . Select vehicle system "01 - Engine electronics". Engine must be running at idling speed.

Display on VAS5051

Scheme 84

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

Display on VAS5051

Scheme 85

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

Display on VAS5051

1. Check indication in display field -3-. DISPLAY GROUP 004: COOLANT TEMPERATURE WITH ENGINE IDLING Display zones 1 2 3 4 Display group 004: Coolant temperature with engine idling Display xxxx rpm xx.x V xxx.x °C xxx.x ° C Display Engine speed Battery voltage Coolant temperature Intake air temperature Range -48.0 to 143.0 ° C Specif. value xxxx rpm 12.0 to 15.0 V The temperature reading should increase evenly from ambient temperature up to 110 ° C

If display zone 3 shows an implausible value

Scheme 86

Scheme 87

1. Disconnect connector -2- at Engine Coolant Temperature (ECT) gauge/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

Scheme 88

If specified value is not obtained

1. Replace coolant temperature sensor.

If specified value is obtained

Scheme 89

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 VAG1598/31»(/audi/a6/c5-2001-2004/remont/cruise-control-systems/#multiport-fuel-injection-mfi-30l-v6-avk__wiring-and-component-check-with-test) .
2. Check for open circuit and short to positive or short to ground in following wiring connections: ECT SENSOR CIRCUIT TEST: OPENS/SHORTS Connector terminal Test box VAG1598/31 Socket 3 108 4 (signal) 93
3. Check for short circuits between two wires.
4. Repair any open/short circuit as necessary.

If no wiring malfunciton is detected

1. Replace engine control module. See «ENGINE CONTROL MODULE (ECM), REPLACING»(/audi/a6/c5-2001-2004/remont/cruise-control-systems/#multiport-fuel-injection-mfi-30l-v6-avk__engine-control-module-ecm-replacing) .

Scheme 90

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

1. Fuses for engine electronics OK
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 VAG1598/31»(/audi/a6/c5-2001-2004/remont/cruise-control-systems/#multiport-fuel-injection-mfi-30l-v6-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: CONTROL MODULE POWER SUPPLY CIRCUIT TEST - 1 OF 3 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: CONTROL MODULE POWER SUPPLY CIRCUIT TEST - 2 OF 3 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

1. Check wiring connections.
2. Connect multimeter as follows to measure voltage: CONTROL MODULE POWER SUPPLY CIRCUIT TEST - 3 OF 3 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 15minutes.
3. Switch ignition on. Specified value: approx. battery voltage

If specified value is not obtained

1. Check wiring connections.
2. Check Motronic ECM power supply relay -J271-. See «MOTRONIC ENGINE CONTROL MODULE (ECM) POWER SUPPLY RELAY -J271-, CHECKING»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-30l-v6-avk) .

Knock control stop, checking

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

Scheme 91

1. VAS5051 with VAS5051/1

1. Connect testing and information system VAS5051. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS5051, CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-30l-v6-avk) . Select vehicle system "01 - Engine electronics". Engine must be running at idling speed.

Display on VAS5051

Scheme 92

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

Display on VAS5051

Scheme 93

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 94

Scheme 95

1. Check indication in display fields -1- to -4-. DISPLAY ZONES IGNITION KNOCK CONTROL CHART Display zones 1 2 3 4 Display group 020: Ignition knock control during driving Display xx.x ° CA xx.x ° ° CA xx.x ° CA xx.x ° CA Display Ignition angle retardation cylinder 1 through Knock control Ignition angle retardation cylinder 2 through Knock control Ignition angle retardation cylinder 3 through Knock control Ignition angle retardation cylinder 4 through Knock control Specif. value 0 to 12 ° CA 0 to 12 ° CA 0 to 12 ° CA 0 to 12 ° CA Note: Evaluation : See «EVALUATION OF IGNITION ANGLE RETARDATION»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-30l-v6-avk) table. 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).
2. To change to display group 021, Press --> button.

Display on VAS5051

1. Check indication in display fields -1- and -2-.

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 --> button.

Evaluation of ignition angle retardation

EVALUATION OF IGNITION ANGLE RETARDATION

Scheme 96

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. To ensure that the knock sensors function properly it is important to keep to the specified tightening torque of 20 Nm. Check connector between knock sensor and wiring harness for corrosion.

1. Disconnect connector of relevant knock sensor. See «COMPONENT LOCATIONS, OVERVIEW»(/audi/a6/c5-2001-2004/remont/cruise-control-systems/#multiport-fuel-injection-mfi-30l-v6-avk__component-locations-overview) .
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 wiring 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 97

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 VAG1598/31»(/audi/a6/c5-2001-2004/remont/cruise-control-systems/#multiport-fuel-injection-mfi-30l-v6-avk__wiring-and-component-check-with-test) .
2. Check for open circuit and short to ground/positive or ground in following wiring connections

1. Knock sensor (KS) 1 -G61- (Bank 1) KNOCK SENSOR CIRCUIT TEST: G61, BANK 1 Connector terminal Test box VAG1598/31 Socket 1 (signal) 106 2 (ground) 99 3 (screening) 108
2. Knock Sensor (KS) 2 -G66- (Bank 2)

KNOCK SENSOR CIRCUIT TEST: G66, BANK 2

1. Repair any open/short circuit as necessary.

Scheme 98

1. VAG1526 A
2. VAG1527 B
3. VAG1594 A
4. VAG1598/31
5. VAS5051 with VAS5051/1

Installation location, see COMPONENT LOCATIONS, OVERVIEW

Note. To gain access to the connectors on cylinder bank 2 (left), 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 99

Scheme 100

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.

1. 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 101

Scheme 102

Scheme 103

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: CMP SENSOR CIRCUIT TEST: VOLTAGE SUPPLY Connector terminal Measure to 1 Engine ground
4. Switch ignition on. Specified value: approx. 5 V

Checking signal wire

1. Connect multimeter as follows to measure voltage: CMP SENSOR CIRCUIT TEST: SIGNAL WIRE Connector terminal Measure to 2 Engine ground

Scheme 104

1. Switch ignition on. Specified value: approx. battery voltage

Checking ground wire

1. Connect multimeter as follows to measure voltage: CMP SENSOR CIRCUIT TEST: GROUND WIRE 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 105

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 VAG1598/31»(/audi/a6/c5-2001-2004/remont/cruise-control-systems/#multiport-fuel-injection-mfi-30l-v6-avk__wiring-and-component-check-with-test) .
2. Check for open circuit and short to positive or ground in following wiring connections

Scheme 106

1. Camshaft Position (CMP) sensor -G40- (Bank 1) CMP SENSOR CIRCUIT TEST: G40, BANK 1 Connector terminal Test box VAG1598/31 Socket 1 (positive) 98 2 (signal) 87 3 (ground) 108
2. Camshaft Position (CMP) sensor 2 -G163- (Bank 2) CMP SENSOR CIRCUIT TEST: G163, BANK 2 Connector terminal Test box VAG1598/31 Socket 1 (positive) 98 2 (signal) 86 3 (ground) 108
3. Camshaft Position (CMP) sensor 3 -G300- (Bank 1) CMP SENSOR CIRCUIT TEST: G300, BANK 1 Connector terminal Test box VAG1598/31 Socket 1 (positive) 98 2 (signal) 81 3 (ground) 108
4. Camshaft Position (CMP) sensor 4 -G301- (Bank 2)

CMP SENSOR CIRCUIT TEST: G301, BANK 2

1. 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 SELECTING FUNCTIONS»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-30l-v6-avk) . Select vehicle system "01 - Engine electronics". Engine must be running at idling speed.

Display on VAS5051

Scheme 107

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

Display on VAS5051

Scheme 108

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

Display on VAS5051

Scheme 109

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»(/audi/a6/c5-2001-2004/remont/mechanical/#30l-v6-engine-code-avk__camshaft-adjustment-checking) .
2. Exit function "08 - Read measured value block" by pressing --> button.

Scheme 110

1. VAS5051 with VAS5051/1

1. Connect testing and information system VAS5051. See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS5051, CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-30l-v6-avk) . Select vehicle system "01 - Engine electronics". Engine must be running at idling speed.

Indicated on display

Scheme 111

1. Press buttons -0- and -8- to select "Read Measuring Value Block" function 08 and press -Q- button to confirm input.

Indicated on display

Scheme 112

1. Press buttons -0-, -1- and -4- to input "display group number 14" and press -Q- button to confirm input.

Indicated on display

Scheme 113

1. Check misfire detection. DISPLAY GROUP 014: MISFIRE DETECTION Display zones 1 2 3 4 Display group 014: Misfire detection Display xxx rpm xx.x% xxx --- Display Engine speed Load Total misfires Misfire detection Range min.: 550 RPM max.: 7200 RPM min.: 0 max.: 100 activated blocked Specif. value 600 to 820 RPM xx.x% 0 to 5 activated Note: --- --- If the specified value is not reached: See «EVALUATING DISPLAY GROUPS 014, 015 AND 016 DISPLAY FIELD»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-30l-v6-avk) .

If the specified value is reached

1. Press --> button.

Indicated on display (function selection)

Scheme 114

If specified value is not obtained

1. Change to display group 015 by pressings button.

Checking misfire recognition of the individual cylinder

Display on VAS5051

Scheme 115

Scheme 116

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: See «EVALUATING DISPLAY GROUPS 014, 015 AND 016 DISPLAY FIELD»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-30l-v6-avk) .
2. Change to display group 016 by pressings button.

Display on VAS5051

1. 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: See «EVALUATING DISPLAY GROUPS 014, 015 AND 016 DISPLAY FIELD»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-30l-v6-avk) .
2. Exit function "08 - Read measured value block" by pressing --> key.

Evaluating display groups 014, 015 and 016 Display field

Evaluating display groups 014, 015 and 016 Display field

EVALUATING DISPLAY GROUPS 014, 015 AND 016 DISPLAY FIELD

See also:
• EMERGENCY BATTERY, SWITCHING OFF/ON
• READINESS CODE, GENERATING
• WIRING AND COMPONENT CHECK WITH TEST BOX VAG1598/31
• COMPONENT LOCATIONS, OVERVIEW
• ENGINE CONTROL MODULE (ECM), REPLACING
• CAMSHAFT ADJUSTMENT, CHECKING
• INJECTORS, CHECKING
• COMPRESSION PRESSURE, CHECKING
• MISFIRE DETECTION, CHECKING
• CHECKING ACTUATION OF POWER OUTPUT STAGES
• CHECKING ACTUATION