Ignition/glow Plug System - 1.8l 5v Turbo, Amb Audi A4 B6

General notes on ignition system

1. Always switch off the ignition before connecting or disconnecting the battery, otherwise the Engine Control Module (ECM) may be damaged.
2. A voltage of at least 12.7 V is necessary for satisfactory functioning of the electrical components.
3. In the case of some tests, a malfunction may be recognized and stored by the control module. At the end of all tests and repairs, therefore, the DTC memory should be checked and, if necessary, erased.
4. If the engine starts briefly and then stops after DTC search, repair or tests on components, this may be because the Immobilizer is blocking the Engine Control Module (ECM). The DTC memory must then be checked and, if necessary, adaptation carried out on the control module.

Safety precautions

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

1. Do not touch or disconnect ignition wiring when the engine is running or at starter speed.
2. Always switch off the ignition before connecting or disconnecting ignition system wiring. This also applies to HT cables and measuring instrument leads.
3. To run engine at starting speed without actually starting it (for example, in order to test compression), remove connector from the power output stage of the ignition coils and also the connectors on the injectors.
4. In the case of some tests, a malfunction may be recognized and stored by the control module. At the end of all tests and repairs, therefore, the DTC memory should be checked and, if necessary, erased. After erasing the DTC memory, generate a readiness code.
5. Always switch off the ignition before washing the engine.

Technical Data

TECHNICAL DATA

Special tools and workshop equipment required

1. V.A.G 1526 A
2. V.A.G 1527 B
3. V.A.G 1594 A
4. V.A.G 1598/31

Test sequence

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

1. Remove engine cover -arrows-.
2. Test misfire detection. Go to «MISFIRE RECOGNITION, CHECKING»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb) . If misfires are detected
3. Continue checking indicated cylinder "If the faulty cylinder is recognized".
4. Disconnect connectors from injectors in sequence with engine running, and observe how engine runs.
5. Compare spark plugs of all cylinders with each other and check for soot on electrodes. If the faulty cylinder is recognized
6. Replace spark plug of faulty cylinder with one from another cylinder.
7. Replace spark plug.
8. Replace ignition coil from faulty cylinder with one from another cylinder.
9. Replace ignition coil.

Test ground (GND) connection

1. Disconnect 4-pin connector -1- from ignition coil -2-.
2. Connect voltage tester V.A.G 1527 B as follows

IGNITION COIL: TERMINAL 2 & 4 MEASURE

1. LED should light up.

If the LED does not light up

1. Check wiring connections.

See appropriate System Wiring Diagram article.

If the LED lights up

Checking power supply

1. Test requirements
2. Fuses for engine electronics OK See appropriate System Wiring Diagrams article.

1. Connect multimeter as follows to measure voltage

IGNITION COIL: TERMINAL 1 MEASURE

1. Switch ignition on.

1. Specified value: approx. battery voltage (B+)

If specified value is obtained

1. Check activation of power output stages. See «CHECKING ACTIVATION OF POWER OUTPUT STAGES»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb__checking-activation-of-power-output-stages) .

If specified value is not obtained

1. Remove rubber seal of plenum chamber cover in direction of arrow.
2. Remove plenum chamber cover -1- from front.
3. Pry off both trim caps -3- with a screwdriver.
4. Undo hex nuts -4- a few turns.
5. Release wiper arms -2- from pivot shaft by tilting them slightly.
6. Remove hex nuts completely and remove wiper arms.
7. Remove retaining clips -1- and remove air cowl grille -5-.

Scheme 1

1. Remove cover for electronics box (plenum chamber) -arrows-.
2. Lift off ECM retaining clip using a screwdriver -arrow- and move module to side.
3. If installed, unclip Transmission Control Module (TCM) retaining clip and move module to one side.
4. Disconnect power supply relay -2-.
5. Perform following tests
6. Check wiring of relay carrier, electronics box, plenum chamber, position 2, terminal 8, to connector of ignition coil terminal 1.
7. Check Motronic ECM power supply relay -J271-. See «MOTRONIC ECM POWER SUPPLY RELAY -J271-, CHECKING»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb__motronic-ecm-power-supply-relay) .

Scheme 2

Checking activation of power output stages

1. Disconnect all injector connectors.

Note. It is important to ensure that no fuel is injected during the test, as this would damage the catalytic converter. Therefore, the connectors on the injectors must be disconnected.

1. Disconnect 4-pin connector -1- from ignition coil -2-.
2. Connect LED voltage tester V.A.G 1527 B to terminals -2- and -3- of the 4-pin ignition coil connector.
3. Operate starter briefly. LED voltage tester should flash (flashes briefly). If LED does not flash
4. Connect test box V.A.G 1598/31 to wiring harness for ECM; do not connect ECM. See «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
5. Check for open circuit, short to positive or short to ground in following wiring connections

Scheme 3

IGNITION COIL CIRCUIT TEST: CONNECTOR TERMINAL 3

1. Repair any open/short circuit as necessary. If no wiring malfunctions are found
2. Replace common component ignition coil with power output stage.

Motronic ECM Power supply relay - J271-, checking

Special tools and workshop equipment required

1. V.A.G 1526 A
2. V.A.G 1594 A
3. V.A.G 1598/31

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

1. Remove engine cover -arrows-.
2. Disconnect 4-pin connector -1- from ignition coil -2-.
3. Connect multimeter as follows to measure voltage.

IGNITION COIL POWER SUPPLY: CONNECTOR TERMINAL 1

1. Switch ignition on. Specified value: approx. battery voltage (B+) If specified value is not obtained
2. Switch ignition off.
3. Remove rubber seal of plenum chamber cover in direction of -arrow-.
4. Remove plenum chamber cover -1- from front.
5. Pry off both trim caps -3- with a screwdriver.
6. Loosen hex nuts -4- several turns.
7. Release wiper arms -2- from pivot shaft by tilting them slightly.
8. Remove hex nuts completely and remove wiper arms.
9. Remove retaining clips -1- and remove air cowl grille -5-.
10. Remove cover for electronics box (plenum chamber) -arrows-.
11. Lift off ECM retaining clip using a screwdriver -arrow- and move module to side.
12. If installed, unclip Transmission Control Module (TCM) retaining clip and move module to one side.
13. Disconnect power supply relay -2-.
14. Check for open circuit in the following wiring according to wiring diagram

POWER SUPPLY RELAY CIRCUIT CHECK: CONNECTION OF IGNITION COILS TERMINAL 1

1. Repair open circuit, if necessary.
2. Check voltage supply of Motronic ECM power supply relay -J271-. See «CHECKING POWER SUPPLY»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb) .
3. Check activation of Motronic ECM power supply relay -J271-. See «CHECKING ACTIVATION»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb__checking-activation) .

1. Connect multimeter as follows to measure voltage.

POWER SUPPLY RELAY CIRCUIT CHECK: TERMINAL 2 & 3 MEASURE

1. Specified value: approx. battery voltage (B+)

If specified value is not obtained

1. Check wiring connections.

See appropriate System Wiring Diagram article.

Checking activation

1. Connect multimeter as follows to measure voltage.

POWER SUPPLY RELAY CIRCUIT CHECK: TERMINAL 6, ACTIVATION

1. Switch ignition on. Specified value: approx. battery voltage (B+)
2. Switch ignition off.
3. Connect test box V.A.G 1598/31 to wiring harness for ECM; do not connect ECM. See «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
4. Check for open circuit, short to positive, or short to ground in following wiring connection(s)

POWER SUPPLY RELAY CIRCUIT CHECK: TERMINAL 6 SOCKET 21

1. Repair any open/short circuit as necessary.
2. Replace power supply relay -J271-.

Engine speed (RPM) sensor -G28-, checking

Special tools and workshop equipment required

1. V.A.G 1526 A
2. V.A.G 1594 A
3. V.A.G 1598/31

Scheme 4

Component location. See item 6 in COMPONENT LOCATIONS, OVERVIEW .

Note. The engine speed (RPM) 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.

1. Before performing test, make sure that sensor is correctly installed and firmly seated.
2. Disconnect engine speed (RPM) sensor connector -G28- -Pos. 3-.

Note. To gain access to the connector, remove coolant expansion tank bolt -arrow- and move expansion tank to the side. Fuel hoses remain connected.

Scheme 5

1. Connect multimeter between terminals 2 and 3 to measure resistance. Specified value: 730...1000ohm

Note. The resistance value of the engine speed (RPM) sensor -G28- is associated with a temperature of 20 °C. The resistance increases if the temperature increases.

If specified value is not obtained

1. Install new engine speed (RPM) -G28-.
2. Connect multimeter between terminals 2 and 1 -screen- and 3 and 1 -screen- to measure resistance. Specified value: each case INFINITY ohm (no continuity)
3. Install a new Engine speed (RPM) sensor -G28-.
4. Connect test box V.A.G 1598/31 to wiring harness for ECM; do not connect ECM. See «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
5. Check for open circuit, short to positive, or short to ground in following wiring connections

ENGINE SPEED SENSOR: TERMINAL 1, 2, 3 & SOCKET 108, 90, 82

1. Repair any open/short circuit as necessary. If no wiring problems are found
2. Replace ECM. See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__engine-control-module-ecm-without-metal) .

Intake Air Temperature (IAT) sensor -G42-, checking

Special tools and workshop equipment required

1. V.A.G 1526 A
2. V.A.G 1594 A
3. V.A.G 1598/31
4. VAS 5051 with VAS 5051/1

Scheme 6

Component location. See item 14 in COMPONENT LOCATIONS, OVERVIEW .

Scheme 7

1. Connect vehicle diagnostic, testing and information system VAS 5051. See «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b6-2000-2006/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Engine must be running at idle. Display on VAS 5051
2. Under -1- select diagnostic function "08 - Read measured value block".

Display on VAS 5051

Scheme 8

1. Display group input

1. Enter "004" for "display group number 004" in zone -2- and confirm entry by pressing -Q- button.
2. Check Intake Air Temperature (IAT) sensor in display zone -4-. DISPLAY GROUP 004: INTAKE AIR TEMPERATURE WITH ENGINE AT IDLE Display zones 1 2 3 4 Display group 004: Intake air temperature with engine at idle Display xxxx rpm xx.x V xxx.x °C xxx.x C Display Engine speed Battery voltage (B+) Coolant temperature Intake air temperature Range -48.0...143.0 °C Specified value xxxx rpm 12.0...15.0 volts 80.0...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.
3. Exit function "08 - Read measured value block" by pressing < button.

Checking wiring

1. Disconnect connector to Intake Air Temperature (IAT) sensor -G42-.
2. Connect test box V.A.G 1598/31 to wiring harness for ECM; do not connect ECM. See «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
3. Check for open circuit, short to positive, or short to ground in following wiring connections

Scheme 9

IAT SENSOR CIRCUIT CHECK: TERMINAL 1, 2 & SOCKET 85, 108

1. Test for short circuits between two wires.
2. Repair any open/short circuit as necessary. If no wiring problems are found

Check sensor

1. Connect multimeter to sensor to measure resistance.

Specifications

IAT SENSOR TEMPERATURE VERSUS RESISTANCE SPECIFICATIONS

If the specified values are not obtained

1. Replace Intake Air Temperature (IAT) sensor -G42-.

Engine Coolant Temperature (ECT) sensor -G62-, checking

Special tools and workshop equipment required

1. V.A.G 1526 A
2. V.A.G 1594 A
3. V.A.G 1598/31
4. VAS 5051 with VAS 5051/1

Scheme 10

Component location. See item 5 in COMPONENT LOCATIONS, OVERVIEW .

Test requirements

1. Engine cold

Scheme 11

Scheme 12

1. Connect vehicle diagnostic, testing and information system VAS 5051. See «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b6-2000-2006/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Engine must be run at idle. Display on VAS 5051
2. Under -1- select diagnostic function "08 - Read measured value block". Display on VAS 5051: Enter display group
3. Enter "004" for "display group number 004" in zone -2- and confirm entry by pressing -Q- button.
4. Check Engine Coolant Temperature (ECT) sensor -G62- in display zone -3-.

DISPLAY GROUP 004: COOLANT TEMPERATURE WITH ENGINE AT IDLE

If display zone 3 shows an implausible value

Scheme 13

Scheme 14

1. Disconnect Engine Coolant Temperature (ECT) sensor connector at -G2- / -G62- -arrow-.
2. Connect multimeter between terminals C and D of sensor to measure resistance. Range A shows resistance values for temperature range 0...50 °C and range B shows the values for temperature range 50...100 °C. Sample readings: 30 °C corresponds to a resistance of 1500...2000ohm 80 °C corresponds to a resistance of 275..375ohm
3. Replace Engine Coolant Temperature (ECT) sensor -G62-.
4. Connect test box V.A.G 1598/31 to wiring harness for ECM; do not connect directly to the ECM. See «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
5. Check for open circuit, short to positive, or short to ground in following wiring connections

ECT SENSOR CIRCUIT CHECK: TERMINAL 3, 4 & SOCKET 108, 93

1. Test for short circuits between two wires.
2. Repair any open/short circuit as necessary.
3. Replace ECM. See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__engine-control-module-ecm-without-metal) .

1. V.A.G 1526 A Multimeter
2. V.A.G 1594 A
3. V.A.G 1598/31 Test box

Scheme 15

1. Fuses for engine electronics OK See appropriate System Wiring Diagrams article.
2. Battery voltage at least 12.7 V
3. Alternator OK

1. Connect test box V.A.G 1598/31 to wiring harness for ECM; do not connect directly to ECM. See «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
2. Switch ignition on.

Note. The positive voltage supply to the ECM is provided via terminal 3 (terminal 15) and terminal 62 (terminal 30). The ground (GND) connection to the ECM is provided via terminal 1 and terminal 2.

1. Connect multimeter as follows to measure voltage

ECM POWER/GROUND CIRCUIT CHECK: SOCKET 1, 2, 62 MEASURE

1. Specified value: approx. battery voltage (B+)

1. Connect multimeter as follows to measure voltage: ECM POWER/GROUND CIRCUIT CHECK: SOCKET 3 MEASURE Test box V.A.G 1598/31 Socket Measure to 3 Engine ground (GND)
2. Switch ignition on. Specified value: approx. battery voltage (B+)
3. Check wiring connections. See appropriate System Wiring Diagram article.
4. Connect multimeter as follows to measure voltage: ECM POWER/GROUND CIRCUIT CHECK: SOCKET 121 MEASURE Test box V.A.G 1598/31 Socket Measure to 121 (1) Engine ground (1) The Motronic Engine Control Module (ECM) Power Supply Relay -J271- carries voltage on terminal 121 of ECM after switching off the ignition for up to 15 minutes.
5. Switch ignition on. Specified value: approx. battery voltage (B+)
6. Check wiring connections. See appropriate System Wiring Diagram article.
7. Check Motronic Engine Control Module (ECM) Power Supply Relay -J271-. See «MOTRONIC ECM POWER SUPPLY RELAY - J271-, CHECKING»(/audi/a4/b6-2000-2006/remont/ignition-system/#ignitionglow-plug-system-18l-5v-turbo-amb__motronic-ecm-power-supply-relay) .

Knock recognition control limit, checking

If a DTC relating to "knock recognition control limit reached" is made, perform the following checks

Scheme 16

Scheme 17

1. Connect vehicle diagnostic, testing and information system VAS 5051. See «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b6-2000-2006/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select vehicle system "01 - Engine electronics" in selection. Engine must be run at idle. Display on VAS 5051
2. Under -1- select diagnostic function "08 - Read measured value block". Display on VAS 5051: Enter display group
3. Enter "020" for "display group number 020" in zone -2- and confirm entry by pressing the -Q- button. Display on VAS 5051
4. Check knock control in display zones -1- to -4-.

DISPLAY GROUP 020: IGNITION KNOCK RECOGNITION CONTROL WHILE 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 ° KW (crankshaft degree).

1. Exit function "08 - Read measured value block" by pressing < button.

Evaluation ignition angle retardation

EVALUATION IGNITION ANGLE RETARDATION CHART

Knock sensors, checking

Special tools and workshop equipment required

1. V.A.G 1526 A
2. V.A.G 1594 A
3. V.A.G 1598/31

Scheme 18

Component location. See item 16 in COMPONENT LOCATIONS, OVERVIEW .

Note. The knock sensors -G61- and -G66- cannot be tested electrically by themselves. 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 exactly to the specified tightening torque of 20 Nm. Check connector between knock sensor and wiring harness for corrosion.

Testing knock sensor wiring

1. Disconnect knock sensor 1 -G61- connector -Pos. 1- or knock sensor 2 -G66- connector -Pos. 4-.

Scheme 19

Note. To gain access to the connector, remove coolant expansion tank bolt -arrow- and move expansion tank to the side. Fuel hoses remain connected.

Scheme 20

1. Test for short between all three terminals in knock sensor connector (terminals 1+2, 1+3, 2+3). Specified value: INIFINITY ohm (no continuity) the wiring must not be connected to each other.
2. If there is a connection between terminals, install a new knock sensor.

Scheme 21

If no malfunction is found

Scheme 22

1. Connect test box V.A.G 1598/31 to wiring harness for ECM; do not connect ECM. See «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
2. Check for open circuit, short to ground, or short to positive in following wiring connections: Knock sensor 1 -G61- (cylinders 1 and 2) KNOCK SENSOR 1 CIRCUIT CHECK: TERMINAL 1, 2, 3 & SOCKET 106, 99, 108 Connector terminal Test box V.A.G 1598/31 Socket 1 (signal) 106 2 (ground) 99 3 (screening) 108
3. Knock sensor 2 -G66- (cylinders 3 and 4)

KNOCK SENSOR 2 CIRCUIT CHECK: TERMINAL 1, 2, 3 & SOCKET 107, 99, 108

1. Repair any open/short circuit as necessary.

Camshaft position (CMP) sensor -G40-, checking

Special tools and workshop equipment required

1. V.A.G 1526 A
2. V.A.G 1527 B
3. V.A.G 1594 A
4. V.A.G 1598/31

Scheme 23

Component location. See item 18 in COMPONENT LOCATIONS, OVERVIEW .

The Camshaft Position (CMP) sensor -G40- indicates the ignition position for cylinder 1.

If the Camshaft Position (CMP) sensor -G40- fails to function, the knock recognition control is switched off and the ignition timing is retarded slightly because the signals can no longer be assigned to the cylinders. Furthermore, the charge pressure of the turbocharger is lowered.

Even without a signal from the Camshaft Position (CMP) sensor -G40-, the engine will continue to run and can also be restarted.

1. When a malfunction is detected, the ECM produces one spark for each cylinder on every crankshaft revolution.
2. The fact that the ECM is out of phase by one engine revolution does not have any noticeable effect on the injection system. If this happens, the fuel is injected "upstream" (before the closed inlet valve) instead of while the inlet valve is open. This has only a minor influence on the quality of the air/fuel mixture.

1. Push back rubber grommet of connector for Camshaft Position (CMP) sensor -G40- back but leave connector attached.
2. Connect LED voltage tester V.A.G 1527 B between receptacle 2 (Camshaft Position (CMP) sensor -G40- signal) and receptacle 1 (B+). NOTE: Receptacles are numbered accordingly on the back of the connector.
3. Operate starter for a few seconds. LED should flash. NOTE: LED voltage testers with a low current consumption continue to glow faintly between activation from the ECM (rather than extinguishing completely) and become much brighter when activated.

Scheme 24

1. Disconnect Camshaft Position (CMP) sensor -G40- connector -arrow-.
2. Connect multimeter as follows to measure voltage: CMP CIRCUIT CHECK: TERMINAL 1 Connector terminal Measure to 1 Engine ground (GND)
3. Switch ignition on. Specified value: approx. 5 V

Scheme 25

1. Connect multimeter as follows to measure voltage: CMP CIRCUIT CHECK: TERMINAL 2 Connector terminal Measure to 2 Engine ground (GND)
2. Switch ignition on. Specified value: approx. battery voltage (B+)

Scheme 26

1. Check for open circuit, short to positive, or short to ground in following wiring connections: CMP CIRCUIT CHECK: TERMINAL 3 Connector terminal Measure to 3 Engine ground (GND)
2. Repair any open/short circuit as necessary. If the specified values are all achieved and the LED voltage tester does not flash (measured between terminals 1 and 2 with starter connector attached)
3. Install a new Camshaft Position (CMP) sensor -G40-.

If the specified values are not obtained

Scheme 27

1. Connect test box V.A.G 1598/31 to wiring harness for ECM; do not connect directly to ECM. See «ELECTRICAL TESTING USING VAG1598/31 TEST BOX»(/audi/a4/b6-2000-2006/remont/fuel-system/#multiport-fuel-injection-mfi-18l-5v-turbo-amb__electrical-testing-using-vag159831-test-box) .
2. Check for open circuit, short to positive, or short to ground in following wiring connections: CMP CIRCUIT CHECK: TERMINAL 1, 2, 3 & SOCKET 98, 86, 108 Connector terminal Test box V.A.G 1598/31 Socket 1 (B+) 98 2 (signal) 86 3 (ground) 108
3. Repair any open/short circuit as necessary.

If a trial erasure of the DTC memory is followed by the replaced indication of a malfunction relating to the Camshaft Position (CMP) sensor -G40- although all previous tests were OK, the following malfunctions are possible

1. Rotor ring for Camshaft Position (CMP) sensor -G40- misaligned

1. Unbolt Camshaft Position (CMP) sensor -G40- and ensure that rotor ring is correctly aligned on camshaft (if it is incorrectly installed, catch will be pressed flat when securing screw is tightened).
2. If position of rotor ring is OK, check position of the camshaft in relation to crankshaft.

See CAMSHAFT TIMING CONTROL, CHECKING .

Special tools and equipment

1. VAS 5051 with VAS 5051/1

Scheme 28

Scheme 29

Scheme 30

1. Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or VAG 1551. See «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS»(/audi/a4/b6-2000-2006/remont/testing-diagnostics/#engine-controls-on-board-diagnostic-obd-18l-5v-turbo-amb) . Select control module for engine electronics 1 by inserting address word 01. Engine must be running at idle for this test. 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 RECOGNITION

If the specified value is reached

1. Press -> button.

Indicated on display (function selection)

Scheme 31

If specified value is not obtained

1. To switch to display group 015 Press up button.

Checking misfire recognition of the individual cylinder

Display on VAS 5051

Scheme 32

1. Check misfire recognition in display zones -1- to -4-.

DISPLAY GROUP 015: MISFIRE RECOGNITION OF CYLINDERS 1, 2 AND 3

1. To switch to display group 016 press up button.
2. Check misfire detection in display zones -1- and -4-. DISPLAY GROUP 016: MISFIRE RECOGNITION OF CYLINDER 4 Display zones 1 2 3 4 Display group 016: Misfire recognition of cylinder 4 Display xxx - Display Number of misfires in cylinder 4 Misfire recognition Range activated activated Specified value 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-18l-5v-turbo-amb__evaluating-display-groups-014-015-and) .
3. Exit function "08 - Read measured value block" by pressing < button.

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

EVALUATING DISPLAY GROUPS 014, 015 & 016 (DISPLAY FIELD 3)

See also:
• BATTERY DISCONNECT PRECAUTIONS
• ELECTRICAL TESTING USING VAG1598/31 TEST BOX
• COMPONENT LOCATIONS, OVERVIEW
• ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING
• VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM, CONNECTING AND SELECTING FUNCTIONS
• MISFIRE RECOGNITION, CHECKING
• CHECKING ACTIVATION OF POWER OUTPUT STAGES
• MOTRONIC ECM POWER SUPPLY RELAY -J271-, CHECKING
• CHECKING ACTIVATION
• EVALUATION IGNITION ANGLE RETARDATION
• KNOCK SENSORS, CHECKING
• EVALUATING DISPLAY GROUPS 014, 015 AND 016, DISPLAY FIELD 3
• CAMSHAFT POSITION (CMP) SENSOR -G40-, CHECKING