Ignition/glow Plug System, Generic Scan Tool (4.2l v8 5v - Art, Awn, Bbd) Audi S6 C5

General notes on ignition system

1. For the electric components to work properly, a voltage of at least 12.7 V is required.
2. 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/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd) .
3. 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.

1. Note radio code (for vehicles equipped with coded anti-theft radio / radio navigation system), obtain if necessary.
2. Disconnect Ground (GND) wire at battery Ground (GND) terminal with the ignition switched off.

Note. Be sure to activate vehicle features (radio/radio-navigation system, clock, electric window regulators) according to owner's manual when the battery is re-connected. Deactivate service mode of Telematics Control Module. See TELEMATICS, ON BOARD DIAGNOSTIC (OBD) . Generate readiness code. See READINESS CODE, GENERATING .

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 disconnect ignition wires when engine is running or turning at starting RPM.
2. Always switch ignition off before disconnecting or reconnecting wires for the ignition system, including high voltage wiring and test leads.
3. It is possible that the control module will recognize a malfunction and store a DTC during some tests. After completing all tests and repairs, DTC memory should therefore be checked and erased if necessary. Readiness code must be generated after DTC memory is erased. See «READINESS CODE, GENERATING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd) .
4. Always switch ignition off before cleaning engine.

Technical data, ignition

ENGINE CODE DATA

Recommended special tools and equipment

1. VAG1526A hand multimeter
2. V.A.G 1527 B Voltage Tester
3. VAG1594A connector test kit
4. VAG1598/31 test box

Note. The ignition coil and power output stage are combined in one complete component.

Test requirement

1. Fuses for engine electronics OK

Work procedure

1. Start engine and let run at idle.

Recognize a non-functional or misfiring cylinder as follows

1. Disconnect connectors from fuel injectors in sequence with engine running and observe engine operation.
2. Compare spark plugs of all cylinders to each other. Check electrodes for carbon fouling.

If faulty cylinder is recognized

1. Switch spark plug from faulty cylinder with one from another cylinder.

If malfunction follows the spark plug

1. Replace spark plug.

If malfunction remains at original cylinder

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

If malfunction follows the ignition coil

1. Replace spark plug.

Scheme 16

1. Remove intake air duct -1- to air filter (arrows).
2. Remove the engine cover (arrows).
3. Remove coolant reservoir -3- (arrows)
4. Disconnect wire from Engine Coolant Level (ECL) Warning Switch -F66- and lay coolant reservoir aside. NOTE: Coolant hoses -1- and -2- remain connected.
5. Disconnect electrical harness connectors -4- from ignition coils at left cylinder head. NOTE: Disregard the other items.
6. Disconnect electrical harness connectors -1- from ignition coils at right cylinder head. NOTE: Disregard the other items.
7. Connect e.g. V.A.G 1527 B voltage tester as follows: IGNITION COIL CIRCUIT TEST: TERMINALS 2 & 4 Harness connector Terminal Measure to 2 B+ 4 B+ LED must light up.

If LED does not light up

1. Check the wire connections for open circuit. Specified value: Wire resistance max 1.5 ohm
2. If necessary, repair wire connection.

If LED lights up

Scheme 17

1. Connect multimeter for voltage measurement as follows: IGNITION COIL CIRCUIT TEST: TERMINAL 1 Harness connector Terminal Measure to 1 Engine Ground (GND)
2. Switch ignition on. Specified value: approx. battery voltage
3. Switch ignition off.

If specified value is obtained

1. Check activation of power output stages. See «CHECKING ACTIVATION OF POWER OUTPUT STAGES»(/audi/s6/c5-1999-2004/remont/ignition-system/#ignitionglow-plug-system-generic-scan-tool-42l-v8-5v-art-awn-bbd__checking-activation-of-power-output-stages) .

If specified value is not obtained

Vehicles without Motronic Engine Control Module (ECM) voltage supply relay -J271

Note. Motronic Engine Control Module (ECM) Power Supply Relay -J271- is not installed on all versions.

1. Check wire connection from Fuel Pump (FP) Relay -J17- in central electronics in driver's side footwell at left, position 4, terminal 23 to harness connector at ignition coil terminal 1.

Scheme 18

1. Pull off rubber seal of plenum chamber cover in direction of arrow.
2. Remove cover -1- toward front.
3. Remove cover for E-box, plenum chamber (arrows).
4. Pry off Engine Control Module (ECM) retaining bracket (arrow) using a screwdriver and set control module aside.
5. Disconnect voltage supply relay -3-.
6. Perform the following tests marked with dots: Check wire connection from 3-pin relay carrier in E-box, plenum chamber, position 2, terminal 8 to harness connector at ignition coil terminal 1. Check Motronic Engine Control Module (ECM) voltage supply relay -J271-. See «CHECK MOTRONIC ENGINE CONTROL MODULE (ECM) POWER SUPPLY RELAY -J271- AND ACTIVATION»(/audi/s6/c5-1999-2004/remont/fuel-system/#multiport-fuel-injection-mfi-generic-scan-tool-42l-v8-5v-art-awn-bbd) .

Checking activation of power output stages

1. Harness connectors at ignition coils disconnected

1. Disconnect all harness connectors from all fuel injectors. NOTE: Fuel must not be injected during the test to avoid damaging catalytic converter. Connectors must therefore be disconnected from fuel injectors.
2. Connect e.g. V.A.G 1527 B voltage tester to connector terminals 2 and 3.
3. Operate starter briefly. LED must blink (brief blink signal).
4. Switch ignition off.

If LED does not blink

Scheme 19

1. Connect test box to wiring harness of Engine Control Module (ECM). See «TEST BOX, CONNECTING FOR WIRING AND COMPONENT TEST»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd) ; ECM is not connected.
2. Check the following wire connections for open circuit according to wiring diagram: IGNITION COIL CIRCUIT TEST: TERMINAL 3 & TEST BOX SOCKETS Harness connector Terminal 3 Test box Socket Cyl. 1 102 Cyl. 2 7 Cyl. 3 111 Cyl. 4 94 Cyl. 5 103 Cyl. 6 110 Cyl. 7 8 Cyl. 8 95 Specified value: Wire resistance max 1.5 ohm
3. Also check wires for short circuit to each other as well as to B+ and Ground (GND). Specified value: INFINITY ohm (no continuity)
4. If necessary, repair wire connection.

If no malfunctions are found in wires

1. Replace the combined component, ignition coil with power output stage.

Final procedures

After repair work, the following work steps must be performed in the mentioned sequence

1. Check DTC memory. See «MODE 3: CHECK DTC MEMORY»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd__mode-3-check-dtc-memory) .
2. If necessary, erase DTC memory. See «MODE 4: RESET/ERASE DIAGNOSTIC DATA»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd__mode-4-reseterase-diagnostic-data) .
3. Generate readiness code. See «READINESS CODE, GENERATING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd) .

1. End diagnosis and switch ignition off.

1. VAG1526A hand multimeter
2. VAG1594A connector test kit
3. VAG1598/31 test box

Note. Knock Sensor (KS) 1 -G61- and Knock Sensor (KS) 2 -G66- themselves cannot be electrically tested. When servicing terminals in harness connector of knock sensors, use only gold-plated terminals. 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.

1. Ignition switched off.

Scheme 20

1. Remove the engine cover (arrows).
2. Disconnect electrical 3-pin harness connector -1- for Knock Sensor (KS) at left or right cylinder head. NOTE: Disregard item -2- and arrows.
3. Check all three terminals at knock sensor connector for short circuit to each other (terminal 1+2, 1+3, 2+3). Specified value: INFINITY ohm (no continuity) - the wires must not have any connection to each other.
4. If there is a connection, replace knock sensor.

If no malfunction can be found

Scheme 21

1. Connect test box to wiring harness of Engine Control Module (ECM). See «TEST BOX, CONNECTING FOR WIRING AND COMPONENT TEST»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd) ; ECM is not connected.
2. Check the following wire connections for open circuit according to wiring diagram: Knock Sensor (KS) 1 -G61- (bank 1) KNOCK SENSOR 1 CIRCUIT TEST: TERMINALS & TEST BOX SOCKETS Harness connector Terminal Test box Socket 1 (signal) 106 2 (Ground -GND-) 99 3 (shielding) 108 Knock Sensor (KS) 2 -G66- (bank 2) KNOCK SENSOR 2 CIRCUIT TEST: TERMINALS & TEST BOX SOCKETS Harness connector Terminal Test box Socket 1 (signal) 107 2 (Ground -GND-) 99 3 (shielding) 108 Specified value: Wire resistance max 1.5 ohm
3. Also check wires for short circuit to each other as well as to B+ and Ground (GND). Specified value: INFINITY ohm (no continuity)
4. If necessary, repair wire connection.

After repair work, the following work steps must be performed in the mentioned sequence

1. Check DTC memory. See «MODE 3: CHECK DTC MEMORY»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd__mode-3-check-dtc-memory) .
2. Erase DTC memory. See «MODE 4: RESET/ERASE DIAGNOSTIC DATA»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd__mode-4-reseterase-diagnostic-data) .
3. Generate readiness code. See «READINESS CODE, GENERATING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd) .

1. End diagnosis and switch ignition off.

Check Camshaft Position (CMP) sensor

Recommended special tools and equipment

1. VAG1526A hand multimeter
2. V.A.G 1527 B Voltage Tester
3. VAG1594A connector test kit
4. VAG1598/31 test box

Component location. See OVERVIEW OF COMPONENT LOCATIONS .

The Camshaft Position (CMP) sensor provides the ignition position for cylinder 1.

During a failure, knock control is switched off and the ignition angle is retarded slightly since a cylinder allocation is no longer possible.

Engine will continue to run without Camshaft Position (CMP) sensor signal and can also be restarted

1. When a malfunction is recognized, the Engine Control Module (ECM) initiates one ignition spark per cylinder for each crankshaft rotation.
2. The offset of one engine rotation will have no noticeable effect on the injection. Instead of occurring with intake valves open, injection will be "advanced" (in front of closed intake valve). This has only a minor effect on the quality of the mixture preparation.

Note. Camshaft Position (CMP) Sensor 2 -G40- is located at front of right cylinder head (bank 1). Camshaft Position (CMP) Sensor -G163- is located at rear of left cylinder head (bank 2). To reach the harness connector, the line to Engine Coolant Level (ECL) Warning Switch at bottom on reservoir must be disconnected, bolts -arrows- of coolant reservoir must be unscrewed and set it aside. Coolant hoses -1- and -2- remain connected.

1. Ignition switched off.

1. Remove the engine cover (arrows).

Checking activation

1. Connect voltage tester e.g. V.A.G 1527 B with measuring probes and connector adapters from V.A.G 1594 A between socket 2 (CMP sensor signal) and socket 1 (B+); the harness connector remains connected. NOTE: Connector sockets are numbered respectively on the rear side of the connector.
2. Operate starter for a few seconds. LED must blink. 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.
3. Switch ignition off.

If LED does not blink

Scheme 22

1. Disconnect electrical harness connector (arrow) from Camshaft Position (CMP) Sensor -G40-.
2. Disconnect electrical harness connector (arrow) from Camshaft Position (CMP) Sensor -G163-.
3. Connect multimeter for voltage measurement as follows: CMP CIRCUIT TEST: TERMINAL 1 Harness connector Terminal Measure to 1 Engine Ground (GND)
4. Switch ignition on. Specified value: about 5 V
5. Switch ignition off.

Scheme 23

1. Connect multimeter for voltage measurement as follows: CMP CIRCUIT TEST: TERMINAL 2 Harness connector Terminal Measure to 2 Engine Ground (GND)
2. Switch ignition on. Specified value: approx. battery voltage
3. Switch ignition off.

Scheme 24

1. Connect multimeter for voltage measurement as follows: CMP CIRCUIT TEST: TERMINAL 3 Harness connector Terminal Measure to 3 B+ Specified value: about 10 V If all specified values are being reached and the LED does not blink (measured between terminal 1 and 2 with starter and connector connected)
2. Replace Camshaft Position (CMP) sensor.

If specified values are not obtained

Scheme 25

1. Connect test box to wiring harness of Engine Control Module (ECM). See «TEST BOX, CONNECTING FOR WIRING AND COMPONENT TEST»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd) ; ECM is not connected.
2. Check the following wire connections for open circuit according to wiring diagram: Camshaft Position (CMP) Sensor 2 -G40- (bank 1) CAMSHAFT POSITION SENSOR 2, BANK 1 CIRCUIT TEST: CONNECTOR TERMINALS Harness connector Terminal Test box Socket 1 (B+) 98 2 (signal) 87 3 (Ground -GND-) 108 Camshaft Position (CMP) Sensor 2 -G163- (bank 2) CAMSHAFT POSITION SENSOR 2, BANK 2 CIRCUIT TEST: CONNECTOR TERMINAL Harness connector Terminal Test box Socket 1 (B+) 98 2 (signal) 86 3 (Ground -GND-) 108 Specified value: Wire resistance max 1.5 ohm
3. Also check wires for short circuit to each other as well as to B+ and Ground (GND). Specified value: INFINITY ohm (no continuity)
4. If necessary, repair wire connection.

After repair work, the following work steps must be performed in the mentioned sequence

1. Check DTC memory. See «MODE 3: CHECK DTC MEMORY»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd__mode-3-check-dtc-memory) .
2. If necessary, erase DTC memory. See «MODE 4: RESET/ERASE DIAGNOSTIC DATA»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd__mode-4-reseterase-diagnostic-data) .
3. Generate readiness code. See «READINESS CODE, GENERATING»(/audi/s6/c5-1999-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-generic-scan-tool-42l-v8-5v-art-awn-bbd) . End diagnosis and switch ignition off.

See also:
• READINESS CODE, GENERATING
• TELEMATICS, ON BOARD DIAGNOSTIC (OBD)
• CHECK MOTRONIC ENGINE CONTROL MODULE (ECM) POWER SUPPLY RELAY -J271- AND ACTIVATION
• MODE 3: CHECK DTC MEMORY
• MODE 4: RESET/ERASE DIAGNOSTIC DATA
• OVERVIEW OF COMPONENT LOCATIONS
• CHECKING ACTIVATION OF POWER OUTPUT STAGES