Ignition/glow Plug System - 2.8l v6 Atq Audi A6 C5

General notes on ignition system

1. The battery should only be disconnected and reconnected when the ignition is turned off, since otherwise the Engine Control Module (ECM) can be damaged .
2. The Engine Control Module (ECM) is equipped with an On Board Diagnostic (OBD)
3. For the electric components to work properly, a voltage of at least 12.7 V is required .
4. It is possible that the control module will recognize a malfunction and store a DTC during some tests. After completing all tests and repairs, DTC memory should therefore be checked and erased if necessary .
5. If the engine only starts briefly and then turns off again after troubleshooting, repair or checking of the components, it may be that the immobilizer is blocking the Engine Control Module (ECM). DTC memory must then be checked and if necessary, control module must be adapted .

Safety precautions

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

1. Do not touch or pull off ignition wires when engine is running or turning at starting RPM.
2. Always switch ignition off before disconnecting or reconnecting wires for the injection and ignition system, including high voltage wiring and test leads.
3. If engine is to be cranked at starting RPM without starting (e.g. for compression testing), disconnect connector from ignition coils and from fuel injectors.
4. It is possible that the control module will recognize a malfunction and store a DTC during some tests. After completing all tests and repairs, DTC memory should therefore be checked and erased if necessary. Readiness code must be generated after DTC memory is erased. See «READINESS CODE, GENERATING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq) .
5. Always switch ignition off before cleaning engine.
6. The battery should only be disconnected and reconnected when the ignition is turned off, since otherwise the Engine Control Module (ECM) can be damaged.

Technical data, ignition

TECHNICAL DATA CHART

Ignition system components, removing and installing

Note. The following list refers to items in (Scheme 32).

1. Spark plug, 30 Nm Remove and install with 3122 B
2. Spark plug connectors with ignition wires
3. Spacer sleeve
4. Rubber grommet
5. 10 Nm
6. Ignition coils ( -N-, -N128-, -N158-) With power output stage -N122- With marking for ignition wires, do not interchange
7. 5-pin harness connector Black
8. 3-pin harness connector Terminals are gold-plated
9. 20 Nm Tightening torque affects function of Knock Sensor (KS)
10. Knock Sensor (KS) 2 -G66- Bank 2 Terminals of sensor and connector are gold-plated
11. Knock Sensor (KS) 1 -G61- Bank 1 Terminals of sensor and connector are gold-plated
12. 10 Nm
13. Camshaft Position (CMP) sensor - G40- Bank 1
14. 25 Nm
15. Washer Conical
16. Face plate for Camshaft Position (CMP) sensor note position when installing
17. 3-pin harness connector Black for Camshaft Position (CMP) sensor -G40- or -G163
18. Camshaft Position (CMP) sensor 2 -G163- Bank 2

Exploded View Of Ignition System Components. Scheme 32

Scheme 33

1. VAG1526A
2. VAG1527B
3. VAG1594A
4. VAG1598/31 (Scheme 33): Identifying Special Tools And Equipment

For component locations, see COMPONENT LOCATIONS, OVERVIEW .

Check ignition coils ( -N-, -N128- and -N158-)

Note. Ignition coils and power output stage are a common part. Primary resistance of ignition coils cannot be measured. Secondary resistance must first be measured with the ignition wires connected to the ignition coils via the spark plug connectors of the corresponding cylinder (This measurement will include measurement of the shielded resistances of the ignition wires).

1. Disconnect 5-pin connector from ignition coils.

Scheme 34

Scheme 35

1. Pull ignition wires from spark plugs. (Scheme 34): Checking Ignition Coil And Spark Plug Wire Resistance
2. Perform a resistance measurement by connecting multimeter between both spark plug connectors of respective ignition circuit to be checked. Specification: each 16 to 27 k ohms
3. If specification is not reached, disconnect ignition wires from ignition coils and perform a separate resistance measurement at ignition wires and at ignition coils. (Scheme 35): Checking Ignition Coil Resistance
4. Perform a resistance measurement by connecting multimeter between both ignition wire connectors and connectors of ignition coil to be checked. Specification: 8 to 14 k ohms
5. Perform a resistance measurement by connecting multimeter between both ignition wire connectors and connectors of ignition wire to be checked. Specification: 3 to 7 k ohm
6. Replace faulty components if specifications are not reached again.

Scheme 36

1. Connect VAG1527B voltage tester as follows: POWER OUTPUT STAGE CIRCUIT TEST: VOLTAGE SUPPLY Harness connector Terminal Measure to 2 B+ (Scheme 36): Identifying Ignition Coil Power Output Stage 5-Pin Harness Connector Terminals LED must light up.

If LED does not light up

1. Check wire connection for open circuit
2. Repair open circuit if necessary.

Checking voltage supply to ignition coils

Note. Voltage is supplied to ignition coils via Fuel Pump (FP) relay.

Scheme 37

1. Fuse for ignition coils OK (Scheme 37): Identifying Ignition Coil Power Output Stage 5-Pin Harness Connector Terminals

1. Connect VAG1527B voltage tester as follows: IGNITION COIL CIRCUIT TEST: VOLTAGE SUPPLY Harness connector Terminal Measure to 1 Engine Ground (GND)
2. Operate starter. LED must light up.

If LED does not light up

1. Check wire connection for open circuit
2. Repair open circuit if necessary.

Scheme 38

1. Disconnect connectors from all six fuel injectors. (afterward check DTC memory) (Scheme 38): Identifying Ignition Coil Power Output Stage 5-Pin Harness Connector Terminals
2. Connect VAG1527B voltage tester as follows: IGNITION COIL POWER OUTPUT STAGE CIRCUIT TEST: ACTIVATION Harness connector Terminal Measure to 3 Engine Ground (GND) 4 Engine Ground (GND) 5 Engine Ground (GND)
3. Operate starter for a few seconds. LED must blink (brief blink signal).

If specified values are not obtained

Scheme 39

1. Switch ignition off.
2. Connect VAG1598/31 test box at wiring harness to ECM; do not connect ECM. See «WIRE AND COMPONENT TEST USING VAG1598/31 TEST BOX»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__wire-and-component-test-using-vag159831). (Scheme 39): Connecting VAG1598/31 Test Box At Wiring Harness To ECM
3. Check following wire connections for open circuit and short circuit to Ground (GND) and B+: IGNITION COIL POWER OUTPUT STAGE CIRCUIT TEST Harness connector Terminal VAG1598/31 test box Socket 3 102 4 103 5 94
4. Repair open circuit or short circuit if necessary.

If no malfunctions are found in wires

1. Replace Engine Control Module (ECM). See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__engine-control-module-ecm-without-metal) .

Scheme 40

1. VAG1526A
2. VAG1594A
3. VAG1598/31
4. VAS5051 with VAG5051/1 or
5. VAG1551 with VAG1551/3B (Scheme 40): Identifying Special Tools And Equipment

For component locations, see COMPONENT LOCATIONS, OVERVIEW .

Test sequence

1. Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word" 01. See «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM OR VAG1551 SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq) . Ignition must remain switched on for this.

When indicated on display

Identifying Scan Tool Display - Checking Intake Air Temperature (IAT) Sensor (1 Of 3). Scheme 41

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

When indicated on display

Identifying Scan Tool Display - Checking Intake Air Temperature (IAT) Sensor (2 Of 3). Scheme 42

1. Press buttons -0-, -0- and -4- to select "display group number 004" and press -Q- button to confirm input.

Indicated on display

Identifying Scan Tool Display - Checking Intake Air Temperature (IAT) Sensor (3 Of 3). Scheme 43

1. Check specified value for Intake Air Temperature (IAT) sensor in display field 4: DISPLAY GROUP 004: INTAKE AIR TEMPERATURE (IAT), ENGINE AT IDLE Display fields 1 2 3 4 Display group 004: Intake Air Temperature (IAT), engine at idle Display xxxx/min xx.xxx volts xxx.x °C xxx.x ° C Indicated Engine speed (RPM) Battery voltage Coolant temperature Intake Air Temperature (IAT) Functional range 670 to 6800 RPM 10.000 to 15.000 V -48.0 to 143.0 ° C -48.0 to 143.0 ° C Specified value xxxx/min 12.000 to 15.000 V 80.0 to 110.0 ° C From ambient temperature up to 120 ° C (1) (1) Approximate values: While driving, up to 24 ° C above ambient temperature. If heated while standing, up to120 ° C is possible.

Scheme 44

1. Connect VAG1598/31 test box at wiring harness to ECM; do not connect ECM. See «WIRE AND COMPONENT TEST USING VAG1598/31 TEST BOX»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__wire-and-component-test-using-vag159831). (Scheme 44): Identifying Intake Air Temperature Sensor Harness Connector Terminals
2. Check following wire connections for open circuit and short circuit to Ground (GND) and B+: INTAKE AIR TEMPERATURE SENSOR CIRCUIT TEST Harness connector Terminal VAG1598/31 test box Socket 1 85 2 108
3. Check both wires to each other for short circuit.
4. Repair open circuit or short circuit if necessary.

If no malfunctions are found in wire

Scheme 45

1. Disconnect connector from Intake Air Temperature (IAT) sensor. (Scheme 45): Checking Intake Air Temperature Sensor Resistance
2. Connect multimeter at sensor for resistance measurement.

Specified values

INTAKE AIR TEMPERATURE SENSOR: TEMPERATURE VERSUS RESISTANCE SPECIFICATIONS

Note. If air temperature is in a range from 0 ° C to 20 ° C, the resistance value must be between 5 k and 2.4 k ohm

If specified value is not obtained

1. Replace Intake Air Temperature (IAT) sensor.

Scheme 46

1. VAG1526A
2. VAG1594A
3. VAG1598/31 (Scheme 46): Identifying Special Tools And Equipment

Component locations, see COMPONENT LOCATIONS, OVERVIEW .

Note. The engine speed (RPM) sensor detects RPM and reference marks. The engine cannot be started without a signal from the engine speed (RPM) sensor -G28-. If the engine speed (RPM) sensor -G28- signal fails while the engine is running, the engine will stop immediately.

Scheme 47

1. Before performing test, check sensor for proper installation and proper fit.
2. Disconnect harness connector for engine speed (RPM) sensor (identification: gray harness connector). (Scheme 47): Identifying Engine Speed (RPM) Sensor 3-Pin Connector Terminals
3. Connect multimeter between terminal 2 and 3 for resistance measurement. Specification: 730 to 1000 ohm

Note. Resistance value of the engine speed (RPM) sensor is based on a temperature of 20 ° C. Resistance increases as temperature increases.

If specified value is not obtained

1. Replace engine speed (RPM) sensor.

If specified value is obtained

Identifying Engine Speed (RPM) Sensor 3-Pin Connector Terminals. Scheme 48

1. Connect multimeter to terminals 2 and 1 (shielding) and to terminals 3 and 1 (shielding) for resistance measurement. Specification: INFINITY ohm each (no continuity)

If specified value is not obtained

1. Replace engine speed (RPM) sensor.

If specified value is obtained

Scheme 49

1. Connect VAG1598/31 test box at wiring harness to ECM; do not connect ECM. See «WIRE AND COMPONENT TEST USING VAG1598/31 TEST BOX»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__wire-and-component-test-using-vag159831). (Scheme 49): Identifying Engine Speed (RPM) Sensor 3-Pin Harness Connector Terminals
2. Check following wire connections for open circuit and short circuit to Ground (GND) and B+: ENGINE SPEED (RPM) SENSOR CIRCUIT TEST Harness connector Terminal VAG1598/31 test box Socket 1 (shielding) 108 2 (Ground -GND-) 90 3 (signal) 82
3. Repair open circuit or short circuit if necessary.

If no malfunctions are found in wires

1. Replace Engine Control Module (ECM). See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__engine-control-module-ecm-without-metal) .

Scheme 50

1. VAG1526A
2. VAG1594A
3. VAG1598/31
4. VAS5051 with VAG5051/1 or
5. VAG1551 with VAG1551/3B (Scheme 50): Identifying Special Tools And Equipment

Component locations, see COMPONENT LOCATIONS, OVERVIEW .

Test requirement

1. Engine cold

1. Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word" 01. See «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM OR VAG1551 SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq) . Engine must run at idle for this.

When indicated on display

Identifying Scan Tool Display - Checking Engine Coolant Temperature (ECT) Sensor (1 Of 3). Scheme 51

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

When indicated on display

Identifying Scan Tool Display - Checking Engine Coolant Temperature (ECT) Sensor (2 Of 3). Scheme 52

1. Press buttons -0-, -0- and -4- to select "display group number 004" and press -Q- button to confirm input.

Indicated on display

Identifying Scan Tool Display - Checking Engine Coolant Temperature (ECT) Sensor (3 Of 3). Scheme 53

1. Check indication in display field 3. DISPLAY FIELDS CHART Display fields 1 2 3 4 Display group 004: Coolant temperature, engine at idle Display xxxx/min xx.xxx V xxx.x °C xxx.x ° C Indicated Engine speed (RPM) Battery voltage Coolant temperature Intake Air Temperature (IAT) Functional range 670 to 6800 RPM 10.000 to 15.000 V -48.0 to 143.0 ° C -48.0 to 143.0 ° C Specified value xxxx/min 12.000 to 15.000 V Temperature value must rise evenly From ambient temperature up to 120 ° C

If display field 3 does not have a realistic indication

Note. Intake air hose between Mass Air Flow (MAF) sensor and intake air elbow must be removed in order to be able to reach the coolant temperature sensor.

1. Disconnect connector at coolant temperature sensor.

Identifying ECT Sensor 4-Pin Connector Terminals (Square Connector). Scheme 54

1. Connect multimeter between terminal 1 and 3 of connector for resistance measurement.

Identifying ECT Sensor 4-Pin Connector Terminals (Oval Connector). Scheme 55

1. Connect multimeter between terminal 3 and 4 of connector for resistance measurement.

All models

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

ECT Sensor Resistance Versus Temperature Graph. Scheme 56

Read-out examples

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 obtained

1. Replace coolant temperature sensor.

If specified value is obtained

1. Connect VAG1598/31 test box at wiring harness to ECM; do not connect ECM. See «WIRE AND COMPONENT TEST USING VAG1598/31 TEST BOX»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__wire-and-component-test-using-vag159831) .

Identifying ECT Sensor Harness Connector Terminals (Square Connector). Scheme 57

1. Check following wire connections for open circuit and short circuit to Ground (GND) and B+: ECT SENSOR CIRUIT TEST (SQUARE CONNECTOR) Harness connector Terminal VAG1598/31 test box Socket 1 (signal) 93 3 108

Identifying ECT Sensor Harness Connector Terminals (Oval Connector). Scheme 58

1. Check following wire connections for open circuit and short circuit to Ground (GND) and B+: ECT SENSOR CIRUIT TEST (OVAL CONNECTOR) Harness connector Terminal VAG1598/31 test box Socket 3 108 4 (signal) 93

1. Check both wires to each other for short circuit.
2. Repair open circuit or short circuit if necessary.

If no malfunctions are found in wires

1. Replace Engine Control Module (ECM). See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__engine-control-module-ecm-without-metal) .

Scheme 59

1. VAG1526A
2. VAG1594A
3. VAG1598/31 (Scheme 59): Identifying Special Tools And Equipment

Test requirements

1. Fuse for Engine Control Module (ECM) OK
2. Battery voltage at least 12.7 V
3. Generator OK

1. Connect VAG1598/31 test box at wiring harness to ECM; do not connect ECM. See «WIRE AND COMPONENT TEST USING VAG1598/31 TEST BOX»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__wire-and-component-test-using-vag159831) .
2. Switch ignition on.

Note. The plus voltage supply for the Engine Control Module (ECM) travels via connector terminal 3 (terminal 15) and connector terminal 62 (terminal 30). Ground (GND) supply of the Engine Control Module (ECM) travels via connector terminal 1 and terminal 2.

1. Connect multimeter for voltage measurement as follows: CONTROL MODULE CIRCUIT TEST: VOLTAGE SUPPLY VAG1598/31 test box Socket Measure to 1 B+ 2 B+ 62 Engine Ground (GND) Specification: approx. battery voltage
2. Connect multimeter for voltage measurement as follows: CONTROL MODULE CIRCUIT TEST: ENGINE GROUND VAG1598/31 test box Socket Measure to 3 Engine Ground (GND)
3. Switch ignition on. Specification: approx. battery voltage

If specified values are not obtained

1. Check wire connections.

Knock recognition control stop, checking

The following tests must be performed when a DTC is stored that relates to "knock recognition control limit reached".

KNOCK RECOGNITION CONTROL STOP CHART

1. Also check ignition angle retardation of individual cylinders. See «CHECK IGNITION ANGLE RETARDATION OF THE INDIVIDUAL CYLINDERS»(/audi/a6/c5-1997-2001/remont/ignition-system/#ignitionglow-plug-system-28l-v6-atq__check-ignition-angle-retardation-of-the) .

Check ignition angle retardation of the individual cylinders

1. Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word" 01. See «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM OR VAG1551 SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq) . Engine must run at idle for this.

When indicated on display

Identifying Scan Tool Display - Checking Knock Recognition Control Stop (1 Of 11). Scheme 60

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

When indicated on display

Identifying Scan Tool Display - Checking Knock Recognition Control Stop (2 Of 11). Scheme 61

1. Press buttons -0-, -2- and -0- to select "display group number 020" and press -Q- button to confirm input.

When indicated on display

Identifying Scan Tool Display - Checking Knock Recognition Control Stop (3 Of 11). Scheme 62

1. Check indication in all display fields. DISPLAY GROUP 020: IGNITION -KNOCK CONTROL IN DRIVING OPERATION Display fields 1 2 3 4 Display group 020: Ignition -knock control in driving operation Display xx.x ° KW xx.x ° KW xx.x ° KW xx.x ° KW Indicated Ignition angle retardation cylinder 1 via knock control Ignition angle retardation cylinder 2 via knock control Ignition angle retardation cylinder 3 via knock control Ignition angle retardation cylinder 4 via knock control Knock sensor control Knock sensor control Knock sensor control Knock sensor control Specified value 0 to 12 ° KW 0 to 12 ° KW 0 to 12 ° KW 0 to 12 ° KW Notes Evaluation , see «EVALUATION DISPLAY GROUPS 020/021/022/023/024 - IGNITION ANGLE RETARDATION»(/audi/a6/c5-1997-2001/remont/ignition-system/#ignitionglow-plug-system-28l-v6-atq) .

Note. Ignition angle retardation occurs in ° KW (crankshaft degrees) toward retardation. The number values indicated in display fields 1 to 4 represent actual ignition angle retardation via knock control of the individual cylinders.

1. Press -C- button.

When indicated on display

Identifying Scan Tool Display - Checking Knock Recognition Control Stop (4 Of 11). Scheme 63

1. Press buttons -0-, -2- and -1- to select "display group number 021" and press - Q- button to confirm input.

When indicated on display

Identifying Scan Tool Display - Checking Knock Recognition Control Stop (5 Of 11). Scheme 64

1. Check indication in display field 1 and 2. DISPLAY GROUP 021: IGNITION -KNOCK CONTROL IN DRIVING OPERATION Display fields 1 2 3 4 Display group 021: Ignition -knock control in driving operation Display xx.x ° KW xx.x ° KW Indicated Ignition angle retardation cylinder 5 via knock control Ignition angle retardation cylinder 6 via knock control Knock sensor control Knock sensor control Specified value 0 to 12 ° KW 0 to 12 ° KW Notes Evaluation , see «EVALUATION DISPLAY GROUPS 020/021/022/023/024 - IGNITION ANGLE RETARDATION»(/audi/a6/c5-1997-2001/remont/ignition-system/#ignitionglow-plug-system-28l-v6-atq) .

Note. Ignition angle retardation occurs in ° KW (crankshaft degrees) toward retardation. The number values indicated in display fields 1 and 2 represent actual ignition angle retardation via knock control of the individual cylinders.

1. Press -C- button.

When indicated on display

Identifying Scan Tool Display - Checking Knock Recognition Control Stop (6 Of 11). Scheme 65

1. Press buttons -0-, -2- and -2- to select "display group number 022" and press - Q- button to confirm input.

When indicated on display

1. Check indications in display field 3 and 4. DISPLAY GROUP 022: IGNITION -KNOCK CONTROL IN DRIVING OPERATION Display fields 1 2 3 4 Display group 022: Ignition -knock control in driving operation Display xxxx/min xxx.x% xx.x ° KW xx.x ° KW Indicated Engine speed (RPM) Engine load Ignition angle retardation cylinder 1 via knock control Ignition angle retardation cylinder 2 via knock control Knock sensor control Knock sensor control Specified value xxxx/min 12 to 100% 0 to 12 ° KW 0 to 12 ° KW Notes Evaluation , see «EVALUATION DISPLAY GROUPS 020/021/022/023/024 - IGNITION ANGLE RETARDATION»(/audi/a6/c5-1997-2001/remont/ignition-system/#ignitionglow-plug-system-28l-v6-atq) .

Note. Ignition angle retardation occurs in ° KW (crankshaft degrees) toward retardation. The number values indicated in display fields 3 and 4 represent actual ignition angle retardation via knock control of cylinders 1 and 2.

1. Press -C- button.

When indicated on display

Identifying Scan Tool Display - Checking Knock Recognition Control Stop (8 Of 11). Scheme 66

1. Press buttons -0-, -2- and -3- to select "display group number 023" and press - Q- button to confirm input.

When indicated on display

Identifying Scan Tool Display - Checking Knock Recognition Control Stop (9 Of 11). Scheme 67

1. Check indications in display field 3 and 4. DISPLAY GROUP 023: IGNITION -KNOCK CONTROL IN DRIVING OPERATION Display fields 1 2 3 4 Display group 023: Ignition -knock control in driving operation Display xxxx/min xxx.x% xx.x ° KW xx.x ° KW Indicated Engine speed (RPM) Engine load Ignition angle retardation cylinder 3 via knock control Ignition angle retardation cylinder 4 via knock control Knock sensor control Knock sensor control Specified value xxxx/min 12 to 100% 0 to 12 ° KW 0 to 12 ° KW Notes Evaluation , see «EVALUATION DISPLAY GROUPS 020/021/022/023/024 - IGNITION ANGLE RETARDATION»(/audi/a6/c5-1997-2001/remont/ignition-system/#ignitionglow-plug-system-28l-v6-atq) .

Note. Ignition angle retardation occurs in ° KW (crankshaft degrees) toward retardation. The number values indicated in display fields 3 and 4 represent actual ignition angle retardation via knock control of cylinders 3 and 4.

1. Press -C- button.

When indicated on display

Identifying Scan Tool Display - Checking Knock Recognition Control Stop (10 Of 11). Scheme 68

1. Press buttons -0-, -2- and -4- to select "display group number 024" and press - Q- button to confirm input.

When indicated on display

Identifying Scan Tool Display - Checking Knock Recognition Control Stop (11 Of 11). Scheme 69

1. Check indications in display field 3 and 4. DISPLAY GROUP 024: IGNITION -KNOCK CONTROL IN DRIVING OPERATION Display fields 1 2 3 4 Display group 024: Ignition -knock control in driving operation Display xxxx/min xxx.x% xx.x ° KW xx.x ° KW Indicated Engine speed (RPM) Engine load Ignition angle retardation cylinder 5 via knock control Ignition angle retardation cylinder 6 via knock control Knock sensor control Knock sensor control Specified value xxxx/min 12 to 100% 0 to 12 ° KW 0 to 12 ° KW Notes Evaluation , see «EVALUATION DISPLAY GROUPS 020/021/022/023/024 - IGNITION ANGLE RETARDATION»(/audi/a6/c5-1997-2001/remont/ignition-system/#ignitionglow-plug-system-28l-v6-atq) .

Note. Ignition angle retardation occurs in ° KW (crankshaft degrees) toward retardation. The number values indicated in display fields 3 and 4 represent actual ignition angle retardation via knock control of cylinders 5 and 6.

Evaluation display groups 020/021/022/023/024 - ignition angle retardation

EVALUATION DISPLAY GROUPS 020/021/022/023/024 - IGNITION ANGLE RETARDATION

1. VAG1526A
2. VAG1594A
3. VAG1598/31 (Scheme 70): Identifying Special Tools And Equipment

Procedure

For component locations, see COMPONENT LOCATIONS, OVERVIEW .

Note. Knock Sensor (KS) 1 -G61- and Knock Sensor (KS) 2 - G66- themselves cannot be electrically tested. Use only gold -plated terminals when servicing harness connector for knock sensors. For the knock sensors to function properly, it is important that tightening torque be exactly 20 Nm. Check harness connector from knock sensor to wiring harness for corrosion.

Scheme 70

1. Disconnect harness connector of relevant knock sensor in engine compartment. see scheme 41: Disconnecting Harness Connector Of Relevant Knock Sensor In Engine Compartment

Note. Coolant reservoir screws must be removed and coolant reservoir must be placed to side in order to access harness connector for knock sensor for bank 2. The coolant hoses can remain connected.

Identifying Knock Sensor 3-Pin Connector Terminals. Scheme 71

1. Check all three terminals at knock sensor connector for short circuit to each other (terminal 1+2, 1+3, 2+3). Specification: INFINITY ohm (no continuity) - the wires must not have any connection to each other.
2. If there is no connection, replace knock sensor.
3. If no short circuit is detected, check knock sensor wires

Check wires from knock sensors to Engine Control Module (ECM) .

1. Connect VAG1598/31 test box at wiring harness to ECM; do not connect ECM. See «WIRE AND COMPONENT TEST USING VAG1598/31 TEST BOX»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__wire-and-component-test-using-vag159831).
2. Check following wire connections for open circuit and short circuit to Ground (GND) and B+: see scheme 43: Identifying Knock Sensor 3-Pin Harness Connector Terminals

Knock Sensor (KS) 1 -G61

KNOCK SENSOR (KS) 1 -G61- CIRCUIT TEST

Identifying Knock Sensor 3-Pin Harness Connector Terminals. Scheme 72

Knock Sensor (KS) 2 -G66

KNOCK SENSOR (KS) 1 -G66- CIRCUIT TEST

1. Repair open circuit or short circuit if necessary.

1. VAG1526A
2. VAG1527B
3. VAG1594A
4. VAG1598/31 (Scheme 73): Identifying Special Tools And Equipment

For component locations, see COMPONENT LOCATIONS, OVERVIEW .

Checking activation

Note. Camshaft Position (CMP) Sensor -G40- is located at front of right cylinder block (Bank 1). Camshaft Position (CMP) Sensor 2 -G163- is located at rear of left cylinder block (Bank 2).

Scheme 73

1. Slide back rubber grommet at connector of respective Camshaft Position (CMP) Sensor (connector remains connected to Camshaft Position (CMP) Sensor).
2. Connect VAG1527B voltage tester between sockets 2 (CMP sensor signal) and 1 (B+). (Scheme 74): Connecting VAG1527B Voltage Tester Between Sockets 2 (CMP Sensor Signal) And 1 (B+)

Note. Connector socket numbers are shown on the rear side of the connector.

1. Operate starter for a few seconds. LED must blink briefly at every second engine rotation.

Note. Voltage testers do not go out completely during low current pick-up between activations by the ECM, but rather continue to glow a little and then get significantly brighter during activation.

If LED does not blink

Scheme 74

1. Disconnect connector at respective Camshaft Position (CMP) sensor.
2. Switch ignition on. see scheme 47: Identifying CMP Sensor 3-Pin Harness Connector Terminals
3. Connect multimeter for voltage measurement as follows: CMP SENSOR CIRCUIT TEST: VOLTAGE SUPPLY Harness connector Terminal Measure to 1 Engine Ground (GND) Specification: about 5 V

Identifying CMP Sensor 3-Pin Harness Connector Terminals. Scheme 75

1. Connect multimeter for voltage measurement as follows: CMP SENSOR CIRCUIT TEST: SIGNAL WIRE Harness connector Terminal Measure to 2 Engine Ground (GND) Specification: approx. battery voltage

Checking Ground (GND) wire

1. Connect multimeter for voltage measurement as follows: CMP SENSOR CIRCUIT TEST: GROUND WIRE Harness connector Terminal Measure to 3 B+ Specification: approx. battery voltage
2. Repair open circuit or short circuit if necessary.

If all specified values are being reached and the LED does not blink (measured between terminal 1 and 2 with starter and connector connected)

1. Replace respective Camshaft Position (CMP) sensor.

If specified values are not obtained, go to Checking wire connections between Camshaft Position (CMP) sensor and Engine Control Module (ECM) .

1. Connect VAG1598/31 test box at wiring harness to ECM; do not connect ECM. See «WIRE AND COMPONENT TEST USING VAG1598/31 TEST BOX»(/audi/a6/c5-1997-2001/remont/fuel-system/#multiport-fuel-injection-mfi-28l-v6-atq__wire-and-component-test-using-vag159831). see scheme 49: Identifying CMP Sensor 3-Pin Harness Connector Terminals
2. Check following wire connections for open circuit and short circuit to Ground (GND) and B+

Camshaft Position (CMP) Sensor -G40- (Bank 1)

CMP SENSOR -G40- (BANK 1) CIRCUIT TEST: TERMINALS 1, 2, 3

Camshaft Position (CMP) Sensor 2 -G163- (Bank 2)

CMP SENSOR -G163- (BANK 2) CIRCUIT TEST: TERMINALS 1, 2, 3

1. Repair open circuit or short circuit if necessary.
2. If, after erasing DTC memory, a DTC relating to Camshaft Position (CMP) sensor (hall sensor) is indicated again, even though all previous tests were OK, following malfunction is possible: Shutter wheel for Camshaft Position (CMP) sensor is not aligned properly.

Check phase position of Camshaft Position (CMP) sensor

1. Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word" 01. See «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM OR VAG1551 SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq) . Engine must run at idle for this.

When indicated on display

Identifying Scan Tool Display - Checking Camshaft Position (CMP) Sensor (1 Of 4). Scheme 76

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

When indicated on display

Identifying Scan Tool Display - Checking Camshaft Position (CMP) Sensor (2 Of 4). Scheme 77

1. Press buttons -0-, -9- and -3- to select "display group number 093" and press -Q- button to confirm input.

When indicated on display

Identifying Scan Tool Display - Checking Camshaft Position (CMP) Sensor (3 Of 4). Scheme 78

1. Check specified values of Camshaft Position (CMP) sensor. DISPLAY GROUP 093: PHASE POSITION OF CAMSHAFT POSITION (CMP) SENSOR BANK 1 AND BANK 2 WITH ENGINE AT IDLE Display fields 1 2 3 4 Display group 093: Phase position of Camshaft Position (CMP) sensor Bank 1 and Bank 2 with engine at idle . Display xxx /min xx% ° KW ° KW Indicated Engine speed Engine load Phase position Phase position Bank 1 Bank 2 Functional range 670 to 6800 RPM 12 to 100% -20 to 15 ° KW -20 to 15 ° KW Specified value 720 to 820 RPM (1) 670 to 770 RPM (2) 12 to 26% -20 to 15 ° KW -20 to 15 ° KW Notes If specified values are not reached, unscrew Camshaft Position (CMP) sensor and check whether shutter wheel is mounted properly at camshaft (if mounted improperly, locking lug will get squished when mounting bolt is tightened) . Also check engine timing See «TIMING BELT»(ref-147486-S11057228442002091600000) . (1) Front Wheel Drive Vehicles (2) All-Wheel Drive Vehicles

Note. ° KW = crankshaft degrees

If specified values are obtained

1. Press -->button.

Indicated on display (function selection)

Identifying Scan Tool Display - Checking Camshaft Position (CMP) Sensor (4 Of 4). Scheme 79

1. Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word" 01. See «VAS 5051 VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM OR VAG1551 SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-atq) . Engine must run at idle for this.

When indicated on display

Identifying Scan Tool Display - Checking Misfire Recognition (1 Of 4). Scheme 80

1. Press buttons -0- and -8- to select "Read measuring value block" function 08. Press -Q- button to confirm input.

When indicated on display

Identifying Scan Tool Display - Checking Misfire Recognition (2 Of 4). Scheme 81

1. Press buttons -0-, -1- and -4- to select "display group number 014" and press -Q- button to confirm input.

When indicated on display

Identifying Scan Tool Display - Checking Misfire Recognition (3 Of 4). Scheme 82

1. Check misfire recognition in display fields 3 and 4. DISPLAY GROUP 014: MISFIRE RECOGNITION Display fields 1 2 3 4 Display group 014: Misfire recognition Display xxxx/min xxx% xxx --- Indicated Engine speed (RPM) Load Number of combustion misfires Misfire recognition Functional range 670 to 6800 RPM 12 to 100% activated locked Specified value 720 to 820 RPM (1) 12 to 26% 0 to 12 activated 670 to 770 RPM (2) Notes If the specified value is exceeded: Check combustion misfires of the individual cylinders . See «CHECKING MISFIRE RECOGNITION OF INDIVIDUAL CYLINDERS»(/audi/a6/c5-1997-2001/remont/ignition-system/#ignitionglow-plug-system-28l-v6-atq__checking-misfire-recognition-of-individual-cylinders) . (1) Front Wheel Drive Vehicles (2) All-Wheel Drive Vehicles

If specified value is obtained

1. Press -->button.

Indicated on display (function selection)

Identifying Scan Tool Display - Checking Misfire Recognition (4 Of 4). Scheme 83

Checking misfire recognition of individual cylinders

1. Press -C- button.

When indicated on display

Identifying Scan Tool Display - Checking Misfire Recognition, Individual Cylinders (1 Of 4). Scheme 84

1. Press buttons -0-, -1- and -5- to select "display group number 015" and press -Q- button to confirm input.

When indicated on display

Identifying Scan Tool Display - Checking Misfire Recognition, Individual Cylinders (2 Of 4). Scheme 85

1. Check misfire recognition in display fields 1 to 4. DISPLAY GROUP 015: MISFIRE RECOGNITION OF CYLINDERS 1, 2 AND 3 Display fields 1 2 3 4 Display group 015: Misfire recognition of cylinders 1, 2 and 3 Display xxx xxx xxx --- Indicated Number of combustion misfires, cylinder 1 Number of combustion misfires, cylinder 2 Number of combustion misfires, cylinder 3 Misfire recognition Functional range activated locked Specified value 0 to 15 0 to 15 0 to 15 activated Notes If the specified value is exceeded: , go to «Evaluation display group 014, display field 3; display group 015 and 016, display fields 1, 2 and 3»(/audi/a6/c5-1997-2001/remont/ignition-system/#ignitionglow-plug-system-28l-v6-atq__evaluation-display-group-014-display-field) .
2. Press -C- button.

When indicated on display

Identifying Scan Tool Display - Checking Misfire Recognition, Individual Cylinders (3 Of 4). Scheme 86

1. Press buttons -0-, -1- and -4- to select "display group number 014" and press -Q- button to confirm input.

When indicated on display

Identifying Scan Tool Display - Checking Misfire Recognition, Individual Cylinders (4 Of 4). Scheme 87

1. Check misfire recognition in display fields 1 to 4. DISPLAY GROUP 016: MISFIRE RECOGNITION OF CYLINDERS 4, 5 AND 6 Display fields 1 2 3 4 Display group 016: Misfire recognition of cylinders 4, 5 and 6 Display xxx xxx xxx --- Indicated Number of combustion misfires, cylinder 4 Number of combustion misfires, cylinder 5 Number of combustion misfires, cylinder 6 Misfire recognition Functional range activated locked Specified value 0 to 15 0 to 15 0 to 15 activated Notes If the specified value is exceeded: , see «Evaluation display group 014, display field 3; display group 015 and 016, display fields 1, 2 and 3»(/audi/a6/c5-1997-2001/remont/ignition-system/#ignitionglow-plug-system-28l-v6-atq__evaluation-display-group-014-display-field) .

Evaluation display group 014, display field 3; display group 015 and 016, display fields 1, 2 and 3

EVALUATION DISPLAY GROUP

See also:
• READINESS CODE, GENERATING
• COMPONENT LOCATIONS, OVERVIEW
• WIRE AND COMPONENT TEST USING VAG1598/31 TEST BOX
• ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING
• FUEL INJECTORS, CHECKING
• KNOCK SENSORS, CHECKING
• CHECK IGNITION ANGLE RETARDATION OF THE INDIVIDUAL CYLINDERS
• CHECKING MISFIRE RECOGNITION OF INDIVIDUAL CYLINDERS
• Evaluation display group 014, display field 3; display group 015 and 016, display fields 1, 2 and 3