Ignition/glow Plug System - 4.2l v8 5v - Art, Awn Audi A6 C5 рестайлинг

General notes on ignition system

1. The engine control module is equipped with On Board Diagnostic (OBD).
2. For trouble-free operation of the electrical components a voltage of at least 11.5 V is necessary.
3. During some of the tests it is possible that the control module will detect and record a malfunction. The DTC memory must therefore be checked and if necessary erased when all tests and repair work have been completed.
4. After completing trouble shooting, repairs or component tests, it is possible that the engine will start, run for a short period and then cut out. If this happens it may be that the immobilizer is blocking the engine control module. In such cases the DTC memory must be checked and if necessary the control module must be adapted.

Safety precautions

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

Technical data, ignition system

TECHNICAL DATA, IGNITION SYSTEM

Ignition coils, checking

Note. Each ignition coil is combined with its power output stage as a single component.

Test conditions

1. No malfunctions stored relating to any of the fuel injectors

The procedure for identifying an inoperative or misfiring cylinder is as follows

1. Disconnect harness connectors from fuel injectors in sequence with engine running, and observe engine behavior.
2. Compare spark plugs of all cylinders with each other and check for soot on the electrodes.

When the faulty cylinder has been identified

1. Swap 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. Swap ignition coil of faulty cylinder with one from another cylinder.
2. If malfunction moves now to other cylinder, install new ignition coil.

Checking Ground (GND) connection for ignition coil

1. Display 4-pin connector from relevant ignition coil.
2. Check Ground (GND) connection between socket 4 on the 4-pin connector and engine Ground (GND) for open circuit and short circuit to positive.
3. Correct any open/short circuit as necessary.

If the Ground (GND) connection is OK, test the voltage supply to the ignition coil. See CHECKING VOLTAGE SUPPLY TO IGNITION COIL .

Scheme 144

1. Connect multimeter (voltage range) to following socket on connector: IGNITION COIL CIRCUIT TEST: VOLTAGE SUPPLY 4-pin connector on wiring harness, socket Specification 1 + Ground (GND) Battery voltage
2. Operate starter. Specification: approx. battery voltage

If the specification is not obtained

1. Check continuity of wiring from socket 1 to fuel pump relay via fuse. Correct open circuit if necessary. See appropriate System Wiring Diagram article.
2. Check output stage. See «POWER OUTPUT STAGES FOR IGNITION COILS, CHECKING»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-42l-v8-5v-art-awn__power-output-stages-for-ignition-coils) .

Power output stages for ignition coils, checking

Note. Each ignition coil is combined with its output stage as a single component.

Checking Ground (GND) connection to output stage

1. Disconnect 4-pin connector from relevant ignition coil.
2. Test Ground (GND) connection between Ground (GND) (vehicle body) and socket 2 on 4-pin connector for open circuit or short circuit to B+.
3. Correct any open/short circuit as necessary. See appropriate System Wiring Diagram article.

If the Ground (GND) connection is OK

1. Check activation of output stages. See «CHECKING ACTIVATION OF OUTPUT STAGES»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-42l-v8-5v-art-awn__checking-activation-of-output-stages) .

Checking activation of output stages

1. Disconnect harness connectors from all 8 fuel injectors.

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

Scheme 145

1. Disconnect 4-pin connector from relevant ignition coil.
2. Connect VAG 1527 diode test lamp to following terminals on connector for ignition coil: IGNITION COIL CIRCUIT TEST: ACTIVATION OF OUTPUT STAGES 4-pin connector on wiring harness for relevant ignition coil, socket Specification 3 + 2 Diode test lamp should blink (brief pulse)
3. Operate starter for few seconds.

If the specifications are not obtained

Scheme 146

1. Switch ignition off.
2. Connect test box VAG 1598/31 to wiring harness for engine control module. DO NOT connect to engine control module itself. See «WIRING AND COMPONENTS, CHECKING WITH VAG 1598/31 TEST BOX»(/audi/a6/c5-2001-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-art-awn__wiring-and-components-checking-with-vag) .
3. Check wiring connection from 4-pin connector on ignition coil (output stage to engine control module for open circuit and short circuit to B+ or Ground (GND) IGNITION COIL CIRCUIT TEST: CYLINDER & TEST BOX CONTACTS Contact 3 on 4-pin connector for ignition coil (output stage) Contact on VAG 1598/31 test box Cylinder 1 102 Cylinder 2 7 Cylinder 3 111 Cylinder 4 94 Cylinder 5 103 Cylinder 6 110 Cylinder 7 8 Cylinder 8 95 Wiring resistance: 1.5 Ohms maximum See appropriate System Wiring Diagram article.
4. Correct any open/short circuit as necessary.

If no wiring malfunction is detected

1. Replace ignition coil with output stage (combined as a single component).
2. Display readiness code. See «READINESS CODE, DISPLAYING»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) . If DTC memory was erased generate readiness code. See «READINESS CODE, GENERATING»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) .

Test sequence

1. Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or VAG 1551 Scan Tool and select engine electronics control module by entering address word "01". See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051 OR VAG 1551 SCAN TOOL, CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) . Engine must be at idle.

Indicated on display

Scheme 147

1. Press buttons -0- and -8- to select function "Read Measuring Value Block" and confirm entry with -Q- button.

Indicated on display

Scheme 148

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

Indicated on display

Scheme 149

1. Check misfire recognition.

DISPLAY GROUP 014: MISFIRE RECOGNITION

If specified value is reached

1. Press --> button.

Indicated on display (select function)

Scheme 150

Evaluation display group 003

EVALUATION OF DISPLAY GROUP 003

Test requirements

1. Fuse for engine control module OK See appropriate Electrical Component Locator article.
2. Battery voltage at least 11 V
3. Generator OK

1. Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or VAG 1551 Scan Tool and select engine electronics control module by entering address word "01". See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051 OR VAG 1551 SCAN TOOL, CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) . Engine must be at idle.

Indicated on display

Scheme 151

1. Press buttons -0- and -8- to select function "Read Measuring Value Block" and confirm entry with -Q- button.

Indicated on display

Scheme 152

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

Indicated on display

Scheme 153

1. Check display readout for battery voltage in display field 2.

DISPLAY GROUP 004: BATTERY VOLTAGE WITH ENGINE IDLING

Evaluation Display Group 4

EVALUATION DISPLAY GROUP 4

Checking voltage supply from terminals 15 and 30

1. Connect VAG 1598/31 test box to wiring harness for engine control module. DO NOT connect to engine control module itself. See «WIRING AND COMPONENTS, CHECKING WITH VAG 1598/31 TEST BOX»(/audi/a6/c5-2001-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-art-awn__wiring-and-components-checking-with-vag) .
2. Connect VAG 1526 multimeter (voltage measurement range) to following sockets on the test box

CONTROL MODULE VOLTAGE SUPPLY FROM TERMINAL 15 & 30: SPECIFICATION

If the specifications are not obtained

1. Check wiring. See appropriate System Wiring Diagram article.
2. Display readiness code. See «READINESS CODE, DISPLAYING»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) . If DTC memory was erased generate readiness code. See «READINESS CODE, GENERATING»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) .

Engine Speed (RPM) Sensor -G28-, checking

Note. The engine speed sensor is a combined speed sensor and reference mark sensor.

Checking engine speed sensor

Component location of connector. See COMPONENT LOCATIONS, OVERVIEW .

1. Before performing the test, make sure that sensor is correctly installed and firmly seated.

1. Check sensor and sensor wheel for damage and make sure they are not obstructed by metal particles. Thickness of spacer between sensor and transmission should be 4.5 mm.
2. Disconnect harness connector for engine speed sensor (grey connector).
3. Connect VAG 1526 multimeter (resistance test range) to terminals 2 and 3 on connector for engine speed sensor using test lead from VAG 1594 connector test kit. Specification: approx. 450 to 1000 ohm

Note. The resistance value for the engine speed sensor is based on a temperature of 20° C. The resistance increases as the temperature rises.

If the specification is not attained

1. Replace Engine Speed (RPM) sensor.

If the specification is attained

1. Connect multimeter VAG 1526 (resistance test range) between terminals 2 and 1 (Ground) and between terminals 3 and 1 (Ground). Specification: Rohm (infinity / open circuit) in each test

If the specification is not attained

1. Replace Engine Speed (RPM) sensor.

If the specification is attained

Check wiring between sensor connector and engine control module as follows

Scheme 154

1. Connect VAG 1598/31 test box to wiring harness for engine control module. DO NOT connect to engine control module itself. See «WIRING AND COMPONENTS, CHECKING WITH VAG 1598/31 TEST BOX»(/audi/a6/c5-2001-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-art-awn__wiring-and-components-checking-with-vag) .
2. Check wiring connection from 3-pin connector (sensor connector) to engine control module for open circuit and/or short circuit to B+ or Ground (GND) ENGINE SPEED (RPM) SENSOR CIRCUIT TEST: OPENS/SHORTS 3-pin connector on wiring harness, contact Socket on VAG 1598/31 test box 1 (shielded wire) 108 2 (Ground (GND) wire) 90 3 (signal wire) 82 Resistance in wiring: max. 1.5 ohm See appropriate System Wiring Diagram article.
3. Correct any open/short circuit as necessary.

If no malfunctions are identified in the wiring

1. Slowly turn engine over and check that sensor wheel has no run-out and is securely mounted.
2. If no malfunctions have been identified in any tests so far, replace Engine Control Module (ECM). See «MOTRONIC ENGINE CONTROL MODULE (ECM) -J220- (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a6/c5-2001-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-art-awn__motronic-engine-control-module-ecm-j220) .
3. Display readiness code. See «READINESS CODE, DISPLAYING»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) . If DTC memory was erased generate readiness code. See «READINESS CODE, GENERATING»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) .

Knock sensor control limit, checking

If the malfunction message "Knock Control - Limit Attained" is recorded in the DTC memory the following tests must be carried out

KNOCK SENSOR SYMPTOM CHART

Knock Sensor (KS) 1 -G61- and Knock Sensor (KS) 2 -G66-, checking

Note. It is not possible to perform an electrical test of the knock sensors themselves. Use function "Check DTC memory". See DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING . To ensure that the knock sensors function properly it is important to keep exactly to the specified tightening torque of 20 Nm (15 ft lb). Use only gold-plated terminals when repairing the terminals in the plug connectors for the knock sensors. Check for corrosion in connection between knock sensor and wiring harness.

Checking knock sensors

Component location of connectors. See COMPONENT LOCATIONS, OVERVIEW .

1. Disconnect harness connector for relevant knock sensor in engine compartment.
2. Check for short circuits between all three terminals in knock sensor connector (terminals 1+2, 1+3 and 2+3). Specification: There must be no contact between the wires (infinity ohm).

If there is a connection between the terminals.

1. Replace Knock Sensor (KS).

If there is no short circuit

1. Check wiring for knock sensors.

Scheme 155

1. Connect VAG 1598/31 test box to wiring harness for engine control module. DO NOT connect to engine control module itself. See «WIRING AND COMPONENTS, CHECKING WITH VAG 1598/31 TEST BOX»(/audi/a6/c5-2001-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-art-awn__wiring-and-components-checking-with-vag) .
2. Check wiring connection from relevant sensor connector to engine control module for open circuit and/or short to B+ or Ground (GND). KNOCK SENSOR CIRCUIT TEST: SPECIFICATIONS Knock Sensor (KS) 1 -G61- (Bank 1) 3-pin connector on wiring harness, socket VAG 1598/31 test box socket 1 (Ground (GND)) 99 2 (signal) 106 3 (shielded wire) 108 Knock sensor (KS) 2 -G66- (Bank 2) 3-pin connector on wiring harness, socket VAG 1598/31 test box socket 1 (Ground (GND)) 99 2 (signal) 107 3 (shielded wire) 108 Resistance in wiring: max. 1.5 ohm See appropriate System Wiring Diagram article.
3. Correct any open/short circuit as necessary.
4. Display readiness code. See «READINESS CODE, DISPLAYING»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) . If DTC memory was erased generate readiness code. See «READINESS CODE, GENERATING»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) .

Camshaft Position (CMP) sensor -G40- and Camshaft Position (CMP) sensor 2 -G163-, checking

The Camshaft Position (CMP) Sensor -G40- indicates the ignition position for Cylinder 1.

If the CMP sensor fails to function, the knock control is switched off and the ignition timing is retarded slightly because cylinder assignment is no longer possible.

Even without a signal from the CMP sensor the engine will continue to run and can also be re-started.

If a malfunction is detected the engine control module produces one spark per crankshaft revolution for each cylinder.

If the injection system is one revolution out of phase it does not have any noticeable effect on the fuel injection. If this happens, the fuel is injected upstream of 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.

Note. The Camshaft Position (CMP) Sensor 2 -G163- is located at the rear of the left-hand cylinder head (Bank 2). The Camshaft Position (CMP) Sensor -G40- is located at the front of the right-hand cylinder head (Bank 1). Component locations of CMP sensors. See COMPONENT LOCATIONS, OVERVIEW .

Checking activation of CMP sensor

Use test leads VAG 1594 connector test kit when carrying out the following tests

1. Push back rubber grommet on relevant CMP sensor connector.
2. Connect VAG 1527 diode test lamp to terminals 1 and 2 of CMP sensor connector from behind (without disconnecting connector from sensor).

Note. The connector terminals are numbered on the back of the connector.

1. Operate starter for few seconds. Diode test lamp should blink briefly once every two engine revolutions.

Note. Diode test lamps with a low current draw continue to glow faintly between impulses from the engine control module (rather than going out completely) and become much brighter when receiving an impulse.

If the diode test lamp does not flash, test the voltage supply.

Checking voltage supply for CMP sensor

1. Disconnect harness connector from relevant CMP sensor.
2. Switch ignition on.
3. Connect VAG 1526 multimeter (voltage measurement range) between engine Ground (GND) and socket 1 of connector. Specification: approx. 5 V

Checking signal wire for CMP sensor

1. Switch ignition on.
2. Connect VAG 1526 multimeter (voltage measurement range) between engine Ground (GND) and socket 2 of relevant connector. Specification: approx. battery voltage

Checking Ground (GND) wire for CMP sensor

1. Connect VAG 1526 multimeter (resistance measurement range) between socket 3 on connector and engine Ground (GND). Specification: Continuity Resistance in wiring: max. 1.5 ohm

If all the readouts match the specifications but the diode test lamp does not flash (measurement taken between terminals 1 and 2 without unplugging connector and while operating starter)

1. Replace relevant CMP sensor.

If the readouts do not match the specification, check the wiring.

Scheme 156

1. Connect VAG 1598/31 test box to wiring harness for engine control module. DO NOT connect to engine control module itself. See «WIRING AND COMPONENTS, CHECKING WITH VAG 1598/31 TEST BOX»(/audi/a6/c5-2001-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-art-awn__wiring-and-components-checking-with-vag) .
2. Check wiring connection from CMP sensor to engine control module for open circuit and/or short circuit to B+ or Ground (GND). CAMSHAFT POSITION SENSOR CIRCUIT TEST: SPECIFICATIONS Camshaft Position (CMP) Sensor -G40- (Bank 1) 3-pin connector on wiring harness, socket VAG 1598/31 test box socket 1 (B+) 98 2 (signal) 86 3 (Ground (GND)) 108 Camshaft Position (CMP) Sensor 2 -G163- (Bank 2) 3-pin connector on wiring harness, socket VAG 1598/31 test box socket 1 (positive) 98 2 (signal) 87 3 (Ground (GND)) 108 Resistance in wiring: max. 1.5 ohm See appropriate System Wiring Diagram article.
3. Correct any open/short circuit as necessary.

If all the test results so far have been OK, but a malfunction related to the CMP sensor is displayed again after erasing the DTC memory as a test measure, the cause may be as follows

Rotor ring (trigger wheel) for CMP sensor misaligned; test phase position.

Checking phase position of CMP sensor

1. Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or VAG 1551 Scan Tool and select engine electronics control module by entering address word "01". See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051 OR VAG 1551 SCAN TOOL, CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) . Engine must be idling.

Indicated on display

Scheme 157

1. Press buttons -0- and -8- to select function "Read Measuring Value Block" and confirm entry with -Q- button.

Indicated on display

Scheme 158

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

Indicated on display

1. Check specified display values for CMP sensors.

DISPLAY GROUP 093: PHASE POSITIONS OF CMP SENSORS (BANK 1 AND BANK 2) WITH ENGINE IDLING

Camshaft adjustment control, function

The adjustment of the intake camshafts is controlled according to engine load and engine speed. The timing of the exhaust camshafts is not variable.

The electrically operated solenoid valves for camshaft adjustment transmit oil pressure to the mechanical camshaft adjusters.

The mechanical camshaft adjusters then advance the inlet camshafts for both cylinder banks, which means that the inlet valves will open earlier.

Checking camshaft adjustment function

1. Connect Vehicle Diagnostic, Testing and Information System VAS 5051 or VAG 1551 Scan Tool and select engine electronics control module by entering address word "01". See «VEHICLE DIAGNOSTIC, TESTING AND INFORMATION SYSTEM VAS 5051 OR VAG 1551 SCAN TOOL, CONNECTING AND SELECTING FUNCTIONS»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) . Engine must be idling.

Indicated on display

Scheme 159

1. Press buttons -0- and -4- to select function "Basic setting" and confirm entry by pressing -Q- button.

Indicated on display

Scheme 160

1. Press buttons -0-, -9- and -4- to select "display group number 094" and confirm entry with -Q- button.

Indicated on display

Scheme 161

1. Check specified display value for camshaft adjustment control. DISPLAY GROUP 094: CAMSHAFT ADJUSTMENT CONTROL Display fields 1 2 3 4 Display Group 094: Camshaft adjustment control Display xxx RPM CS-ctrl. OFF Test OFF Test OFF Indicates Engine speed (in steps of 40 RPM) Camshaft adjustment control off/on Test result, Bank 1 Test result, Bank 2 Range min.: 550 RPM max.: 6600 RPM CS-ctrl. OFF CS-ctrl. ON Test OFF Test ON Syst. OK Syst.n.OK Test OFF Test ON Syst. OK Syst.n.OK Specified value Current engine speed CS-ctrl. OFF Test OFF Test OFF Note Normal position Normal position
2. Increase engine speed to approx.: 2000 RPM until "CS - ctrl. ON" appears in display field 2 DISPLAY GROUP 094: CAMSHAFT ADJUSTMENT CONTROL Display fields 1 2 3 4 Display Group 094: Camshaft adjustment control Display xxx RPM CS-ctrl. ON Test ON Test ON Indicates Engine speed (in steps of 40 RPM) Camshaft adjustment control off/on Test result, Bank 1 Test result, Bank 2 Range min.: 550 RPM max.: 6600 RPM CS-ctrl. OFF CS-ctrl. ON Test OFF Test ON Syst. OK Syst.n.OK Test OFF Test ON Syst. OK Syst.n.OK Specified value Current engine speed CS-ctrl. ON Test ON Test ON Note
3. Maintain engine speed until "Syst. OK" appears in display fields 3 and 4.

DISPLAY GROUP 094: CAMSHAFT ADJUSTMENT CONTROL

If the specified readout is not obtained in display fields 3 and 4

1. Test solenoid valves for camshaft adjustment. See «VALVE 1 FOR CAMSHAFT ADJUSTMENT -N205- AND VALVE 2 FOR CAMSHAFT ADJUSTMENT -N208-, CHECKING»(/audi/a6/c5-2001-2004/remont/ignition-system/#ignitionglow-plug-system-42l-v8-5v-art-awn__valve-1-for-camshaft-adjustment-n205) .

Valve 1 for camshaft adjustment -N205- and Valve 2 for camshaft adjustment -N208-, checking

1. Switch ignition on.
2. Start output Diagnostic Test Mode (DTM) and select camshaft adjustment. See «OUTPUT DIAGNOSTIC TEST MODE (DTM)»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) .

Indicated on display

Scheme 162

When camshaft adjustment is activated, both solenoid valves should click audibly.

If this result is not obtained, perform the following tests

Electrically testing solenoid valves for camshaft adjustment

1. Disconnect harness connector from camshaft adjustment solenoid valve which is to be tested.
2. Measure resistance between valve contacts using VAG 1526 multimeter. Specification: 10 to 18 ohm

If the reading does not match the specification

1. Replace relevant camshaft adjustment solenoid valve.

Checking voltage supply to camshaft adjustment solenoid valves

1. Disconnect harness connector from solenoid valve which is to be tested.
2. Connect VAG 1527 diode test lamp between engine Ground (GND) and socket 1 (B+) of harness connector using test leads from VAG 1594 connector test kit.
3. Operate starter for few seconds. Engine can be allowed to start. Diode test lamp should light up.

If the diode test lamp does not light up, perform the following tests

1. Test fuse for camshaft adjustment solenoid valves. See appropriate System Wiring Diagram article.

If fuse is OK

Scheme 163

1. Check for continuity in wiring between socket 1 on connector and fuel pump relay via fuse. See appropriate System Wiring Diagram article.

Checking activation of camshaft adjustment solenoid valves

1. Disconnect harness connector from solenoid valve which is to be tested.
2. Connect VAG 1527 diode test lamp between sockets 1 (B+) and 2 of relevant solenoid valve harness connector using test leads VAG 1594 connector test kit.
3. Start output Diagnostic Test Mode (DTM) and select camshaft adjustment. See «OUTPUT DIAGNOSTIC TEST MODE (DTM)»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) .

Indicated on display

Scheme 164

When camshaft timing control is activated diode test lamp should start flashing.

If the diode test lamp lights up continuously

1. Check for short to Ground (GND) in wiring from socket 2 on connector for relevant camshaft adjustment solenoid valve.

If the diode test lamp does not flash

Scheme 165

1. Connect VAG 1598/31 test box to wiring harness for engine control module. DO NOT connect to engine control module itself. See «WIRING AND COMPONENTS, CHECKING WITH VAG 1598/31 TEST BOX»(/audi/a6/c5-2001-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-art-awn__wiring-and-components-checking-with-vag) .
2. Check for open circuit or short to B+ in wiring of connector for relevant camshaft adjustment solenoid valve. SOLENOID VALVES FOR CAMSHAFT ADJUSTMENT CIRCUIT TEST: ACTIVATION 2-pin connector on wiring harness, terminal Socket on VAG 1598/31 test box 2 115 Resistance in wiring: max. 1.5 ohm See appropriate System Wiring Diagram article.
3. Correct any open or short circuits.

If no open or short circuits are identified

1. Replace Engine Control Module (ECM). See «MOTRONIC ENGINE CONTROL MODULE (ECM) -J220- (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING»(/audi/a6/c5-2001-2004/remont/fuel-system/#multiport-fuel-injection-mfi-42l-v8-5v-art-awn__motronic-engine-control-module-ecm-j220) .
2. Display readiness code. See «READINESS CODE, DISPLAYING»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) . If DTC memory was erased generate readiness code. See «READINESS CODE, GENERATING»(/audi/a6/c5-2001-2004/remont/testing-diagnostics/#on-board-diagnostic-obd-42l-v8-5v-art-awn) .
3. If no malfunctions have been identified in any tests so far, replace relevant mechanical camshaft adjuster. See «CAMSHAFTS AND CAMSHAFT ADJUSTERS, REMOVING AND INSTALLING»(/audi/a6/c5-2001-2004/remont/mechanical/#42l-v8-5v-engine-codes-art-awn-bbd) .

See also:
• READINESS CODE, GENERATING
• WIRING AND COMPONENTS, CHECKING WITH VAG 1598/31 TEST BOX
• FUEL INJECTORS, CHECKING
• COMPONENT LOCATIONS, OVERVIEW
• MOTRONIC ENGINE CONTROL MODULE (ECM) -J220- (WITHOUT METAL ANTI-THEFT HOUSING), REPLACING
• DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING AND ERASING
• CAMSHAFTS AND CAMSHAFT ADJUSTERS, REMOVING AND INSTALLING
• CHECKING VOLTAGE SUPPLY TO IGNITION COIL
• POWER OUTPUT STAGES FOR IGNITION COILS, CHECKING
• CHECKING ACTIVATION OF OUTPUT STAGES
• Evaluation display group 003
• IGNITION COILS, CHECKING
• Evaluation Display Group 4
• CHECKING VOLTAGE SUPPLY FROM TERMINALS 15 AND 30
• KNOCK SENSOR (KS) 1 -G61- AND KNOCK SENSOR (KS) 2 -G66-, CHECKING
• VALVE 1 FOR CAMSHAFT ADJUSTMENT -N205- AND VALVE 2 FOR CAMSHAFT ADJUSTMENT -N208-, CHECKING