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

Technical data, spark plugs

SPARK PLUGS TECHNICAL DATA

Camshaft Position (CMP) sensor -G40-, checking

Note. Camshaft Position (CMP) sensor -G40- is located on Bank 1, front of right (passenger's) side engine bank. Checking -G163-. See CAMSHAFT POSITION (CMP) SENSOR 2 -G163-, CHECKING . Component location, see COMPONENT LOCATIONS .

Required special tools and test equipment

1. VAG1598/22 test box
2. Multimeter US1119 (Fluke 83 or equivalent)
3. VW1594 connector test kit
4. Wiring diagrams

Scheme 1

1. Disconnect 3-pin harness connector from Camshaft Position (CMP) sensor -G40-. (Scheme 1): Identifying Harness Connector Terminals Of Camshaft Position (CMP) Sensor G40
2. Connect multimeter US1119 (Fluke 83 or equivalent) to measure voltage across CMP connector terminals 1 (B+) and 3 (Ground), using adapters from VW1594 connector test kit.
3. Switch ignition on.
4. Measure voltage between terminals 1 and 3. Specified value: 9.0 to 14.5 volts
5. Switch ignition off.

If voltage is OK

Scheme 2

1. Connect VAG1598/22 test box to Motronic ECM harness connector. See «VAG1598/22 TEST BOX, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__vag159822-test-box-connecting).
2. Check wiring for open circuit between ECM/test box and 3 -pin harness connector, according to wiring diagram. Connector terminal 1 to ECM/test box socket 11 Connector terminal 2 to ECM/test box socket 44 Connector terminal 3 to ECM/test box socket 14 Specified value: max. 1.5 ohm (Scheme 2): Identifying Harness Connector Terminals Of Camshaft Position (CMP) Sensor G40
3. Check wiring for short circuit between ECM/test box and 3 -pin harness connector, according to wiring diagram. Connector terminal 3 to ECM/test box socket 44 Connector terminal 3 to ECM/test box socket 11 Connector terminal 2 to ECM/test box socket 11 Specified value: INIFINITY ohm

If wiring is OK (and voltage across terminals 1 and 3 is OK)

1. Replace Camshaft Position (CMP) sensor -G40-.

If wiring is OK (but still no voltage across terminals 1 and 3)

1. Replace Motronic ECM -J220-. See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REMOVING AND INSTALLING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__engine-control-module-ecm-without-metal) .
2. Perform adaptation of throttle valve control module to ECM. See «THROTTLE VALVE CONTROL MODULE, ADAPTATION TO ENGINE CONTROL MODULE (ECM)»(ref-216409-S01894933852006012100000) .
3. Check readiness code. See «READINESS CODE»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha) .
4. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. See «READINESS CODE, CHECKING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__readiness-code-checking) .

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

Note. Camshaft Position (CMP) sensor 2 -G163- is located on Bank 2, rear of left (driver's) side engine bank. Checking -G40-. See CAMSHAFT POSITION (CMP) SENSOR -G40-, CHECKING . Component location, see COMPONENT LOCATIONS

1. VAG1598/22 test box
2. Multimeter US1119 (Fluke 83 or equivalent)
3. VW1594 connector test kit
4. Wiring diagrams

Scheme 3

1. Disconnect 3-pin harness connector from Camshaft Position (CMP) sensor -G163-. (Scheme 3): Identifying Harness Connector Terminals Of Camshaft Position (CMP) Sensor G163
2. Connect multimeter US1119 (Fluke 83 or equivalent) to measure voltage across CMP connector terminals 1 (B+) and 3 (Ground), using adapters from VW1594 connector test kit.
3. Switch ignition on.
4. Measure voltage between terminals 1 and 3. Specified value: 9.0 to 14.5 volts
5. Switch ignition off.

If voltage is OK

Scheme 4

1. Connect VAG1598/22 test box to Motronic ECM harness connector. See «VAG1598/22 TEST BOX, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__vag159822-test-box-connecting).
2. Check wiring for open circuit between ECM/test box and 3 -pin harness connector, according to wiring diagram. Connector terminal 1 to ECM/test box socket 11 Connector terminal 2 to ECM/test box socket 76 Connector terminal 3 to ECM/test box socket 67 Specified value: max. 1.5 ohm (Scheme 4): Identifying Harness Connector Terminals Of Camshaft Position (CMP) Sensor G163
3. Check wiring for short circuit between ECM/test box and 3 -pin harness connector, according to wiring diagram. Connector terminal 3 to ECM/test box socket 76 Connector terminal 3 to ECM/test box socket 11 Connector terminal 2 to ECM/test box socket 11 Specified value: INIFINITY ohm

If wiring is OK (and voltage across terminals 1 and 3 is OK)

1. Replace Camshaft Position (CMP) sensor -G163-.

If wiring is OK (but still no voltage across terminals 1 and 3)

1. Replace Motronic ECM -J220-. See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REMOVING AND INSTALLING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__engine-control-module-ecm-without-metal) .
2. Carry out adaptation of throttle valve control module to ECM. See «THROTTLE VALVE CONTROL MODULE, ADAPTATION TO ENGINE CONTROL MODULE (ECM)»(ref-216409-S01894933852006012100000) .
3. Check readiness code. See «READINESS CODE»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha) .
4. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. See «READINESS CODE, CHECKING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__readiness-code-checking) .

1. VAG1551/1552 Scan Tool (ST) with VAG1551/3 adapter cable
2. VAG1598/22 test box
3. Multimeter US1119 (Fluke 83 or equivalent)
4. VW1594 connector test kit
5. Wiring diagrams

Checking

1. Connect VAG1551/1552 Scan Tool (ST) and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with engine running at idle). See «VAG1551/VAG1552 SCAN TOOL (ST), CONNECTING AND SELECTING "ENGINE ELECTRONICS" ADDRESS WORD 01»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__vag1551vag1552-scan-tool-st-connecting-and) .

Indicated on display

Checking Knock Sensor And Knock Sensor Control Using VAG Scan Tool (1 Of 3). Scheme 5

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

Indicated on display

Checking Knock Sensor And Knock Sensor Control Using VAG Scan Tool (2 Of 3). Scheme 6

1. Press buttons corresponding to following display group numbers and press -Q- button to confirm input. 022: Display group 22, for cylinders 1 and 2 023: Display group 23, for cylinders 3 and 4 024: Display group 24, for cylinders 5 and 6

Indicated on display (1-4 - display groups)

Checking Knock Sensor And Knock Sensor Control Using VAG Scan Tool (3 Of 3). Scheme 7

Note. The test must be carried out during a road test because the knock sensor system is only active with engine speed greater than 2600 RPM and engine load greater than 3 ms.

1. Road test and compare display with specified values for knock sensor system in display field 1-4.

DISPLAY GROUP 22 KNOCK CONTROL

If displayed values are OK

1. Press --> button.
2. Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
3. Check readiness code. See «READINESS CODE»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha) .
4. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. See «READINESS CODE, CHECKING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__readiness-code-checking) .

Evaluation of display groups 22, 23 and 24

DISPLAY GROUPS 22, 23 AND 24 EVALUATION

Scheme 8

1. Disconnect 3-pin connector from Knock Sensor (KS) 1 - G61-. (Scheme 8): Identifying Connector Terminals Of Knock Sensor (KS), 1 - G61
2. Connect multimeter US1119 (Fluke 83 or equivalent) to measure resistance between connector terminals, using adapters from VW1594 connector test kit. Knock sensor terminals 1 and 2 Knock sensor terminals 1 and 3 Knock sensor terminals 2 and 3 Specified value: INIFINITY ohm

If resistance is OK (no continuity)

Scheme 9

Scheme 10

1. Connect VAG1598/22 test box to Motronic ECM harness connector. See «VAG1598/22 TEST BOX, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__vag159822-test-box-connecting). (Scheme 9): Identifying 3-Pin Harness Connector Terminals Of Knock Sensor (KS), 1 - G61
2. Check wiring for open circuit between ECM/test box and 3 -pin harness connector, according to wiring diagram. Connector terminal 1 to ECM/test box socket 68 Connector terminal 2 to ECM/test box socket 67 Connector terminal 3 to ECM/test box socket 67 Specified value: max. 1.5 ohm (Scheme 10): Identifying 3-Pin Harness Connector Terminals Of Knock Sensor (KS) 1, G61
3. Check wiring for short circuits between terminals of 3 -pin connector, and between connector and ECM/test box. Connector terminal 2 to ECM/test box socket 68 Connector terminal 3 to ECM/test box socket 68 Specified value: INIFINITY ohm

If the wiring is OK

1. Loosen knock sensor and tighten to 20 Nm (15 ft lb).

If the malfunction still exists (stored in DTC memory)

Scheme 11

1. Replace Knock Sensor (KS) 1 -G61-.
2. Check readiness code. See «READINESS CODE»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha).
3. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. See «READINESS CODE, CHECKING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__readiness-code-checking).
4. Disconnect 3-pin connector from Knock Sensor (KS) 2 -G66-. (Scheme 11): Identifying Connector Terminals Of Knock Sensor (KS) 2, G66
5. Connect multimeter US1119 (Fluke 83 or equivalent) to measure resistance between connector terminals, using adapters from VW1594 connector test kit. Knock sensor terminals 1 and 2 Knock sensor terminals 1 and 3 Knock sensor terminals 2 and 3 Specified value: INIFINITY ohm

If resistance is OK (no continuity)

Scheme 12

Scheme 13

1. Connect VAG1598/22 test box to Motronic ECM harness connector. See «VAG1598/22 TEST BOX, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__vag159822-test-box-connecting). (Scheme 12): Identifying Harness Connector Terminals Of Knock Sensor (KS) 2, G66
2. Check wiring for open circuit between ECM/test box and 3 -pin harness connector, according to wiring diagram. Connector terminal 1 to ECM/test box socket 60 Connector terminal 2 to ECM/test box socket 67 Connector terminal 3 to ECM/test box socket 67 Specified value: max. 1.5 INIFINITY ohm (Scheme 13): Identifying Harness Connector Terminals Of Knock Sensor (KS) 2, G66
3. Check wiring for short circuits between terminals of 3 -pin connector, and between connector and ECM/test box. Connector terminal 2 to ECM/test box socket 60 Connector terminal 3 to ECM/test box socket 60 Specified value: INIFINITY ohm

If the wiring is OK

1. Loosen knock sensor and tighten to 20 Nm (15 ft lb).

If the malfunction still exists (stored in DTC memory)

1. Replace Knock Sensor (KS) 2 -G66-.
2. Check readiness code. See «READINESS CODE»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha) .
3. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. See «READINESS CODE, CHECKING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__readiness-code-checking) .

1. VAG1551 or VAG1552 Scan Tool (ST) with VAG1551/3 adapter cable

1. Connect VAG1551/1552 Scan Tool (ST) and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with engine running at idle). See «VAG1551/VAG1552 SCAN TOOL (ST), CONNECTING AND SELECTING "ENGINE ELECTRONICS" ADDRESS WORD 01»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__vag1551vag1552-scan-tool-st-connecting-and) .

Indicated on display

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

Indicated on display

Checking Misfire Recognition Using VAG Scan Tool (2 Of 5). Scheme 14

1. Press buttons -0-, -1- and -4- to input display group number 14 (014), and press -Q- button to confirm input.

Indicated on display (1-4 - display groups)

Checking Misfire Recognition Using VAG Scan Tool (3 Of 5). Scheme 15

1. Compare displayed values with specified values for misfire recognition (display fields 3-4)

DISPLAY GROUP 14: MISFIRE RECOGNITION

If displayed values are OK

1. Press --> button.
2. Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.
3. Check readiness code. See «READINESS CODE»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha) .
4. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. See «READINESS CODE, CHECKING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__readiness-code-checking) .

If displayed values are NOT OK

1. Press -C- button.
2. Press buttons -0-, -1- and -5- to input display group number 15 (015), and press -Q- button to confirm input.

Indicated on display (1-4 - display groups)

Checking Misfire Recognition Using VAG Scan Tool (4 Of 5). Scheme 16

1. Compare displayed values with specified values for misfire recognition (display fields 1-4)

DISPLAY GROUP 15: MISFIRE RECOGNITION

If displayed values are OK

1. Press -C- button.
2. Press buttons -0-, -1- and -6- to input display group number 16 (016), and press -Q- button to confirm input.

Indicated on display (1 -4 - display groups)

Checking Misfire Recognition Using VAG Scan Tool (5 Of 5). Scheme 17

1. Compare displayed values with specified values for misfire recognition (display fields 1 and 4)

DISPLAY GROUP 16: MISFIRE RECOGNITION

Evaluation of display groups 15 and 16

DISPLAY GROUPS 15 AND 16 EVALUATION

Ignition coils and power output stage, checking

Note. The ignition coils and power output stage are one component. Measuring the primary resistance of the ignition coils is not possible. Measure secondary resistance first with ignition wires connected to the ignition coil via the spark plug connector of the respective cylinder (with this method the interference resistances of the ignition cables are also measured). Component locations, see COMPONENT LOCATIONS

1. Multimeter US1119 (Fluke 83 or equivalent)
2. VAG1598/22 test box
3. VW1594 connector test kit

Test conditions

1. No fuel injector malfunction stored in DTC memory

1. Check DTC memory. See «CHECK DTC MEMORY (SCAN TOOL FUNCTION 02)»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha) . There must be no malfunctions stored
2. If DTC memory is not clear (malfunctions recognized): Make necessary repairs and erase DTC memory. Stop engine and start engine again. Road test. Check and erase DTC memory again.
3. Check which cylinder is misfiring, or not firing at all by briefly disconnecting fuel injector connectors with engine running.

A misfiring cylinder can also be isolated by examining the spark plugs (for a carbon -fouled plug).

1. Interchange spark plug with one from cylinder that is OK.

If a different cylinder now misfires

1. Replace faulty spark plug.

If the original cylinder misfires

1. Check ignition coil. See «CHECKING IGNITION COILS -N-, -N128- AND -N158»(/audi/a6/c5-1997-2001/remont/ignition-system/#ignitionglow-plug-system-28l-v6-aha) .

1. Disconnect 5-pin connector from ignition coil assembly.
2. Remove ignition wires from spark plugs.
3. Using multimeter and adapters from VAG1594 connector test kit, measure resistance between both spark plug connectors of respective ignition circuit (across coil). (Scheme 18): Checking Ignition Coil And Spark Plug Wire Resistance (-N-, -N128- And -N158) Specification: approx. 18-25 k ohm.

If resitance is NOT OK

Scheme 18

1. Remove ignition wires from ignition coils and measure resistance between ends of respective ignition wires. Specification: approx. 4.0-6.0 k ohms
2. Using multimeter and adapters from VAG1594 connector test kit, measure resistance across both ignition wire connectors of respective ignition coil. (Scheme 19): Measuring Ignition Coil Resistance Specification: 8.0-14.0 k ohm

If resistance values are not as specified

1. Replace coils.

If resistance values are OK

1. Check signal for power output stage. See «CHECKING SIGNAL FOR POWER OUTPUT STAGE»(/audi/a6/c5-1997-2001/remont/ignition-system/#ignitionglow-plug-system-28l-v6-aha) .

Scheme 19

1. Remove connectors from all 6 injectors (DTC memory will have to be checked and erased later).
2. Switch ignition on. (Scheme 20): Identifying Ignition Coil Power Output Stage Harness Connector Terminals
3. Connect LED tester VAG1527 between engine ground and connector terminal 3.
4. Crank starter for several seconds. LED in voltage tester must flash.
5. Repeat test on 5-pin connector terminals 4 and 5.

If LED flashes

1. Replace ignition coils -N-, -N128- and -N158- with power output stage -N122 -.

If LED does not flash

Scheme 20

1. Connect VAG1598/22 test box to ECM harness connector. See «VAG1598/22 TEST BOX, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__vag159822-test-box-connecting). (Scheme 21): Identifying Terminals Of ECM Harness Connectors
2. Check wiring between ECM/test box and 5-pin connector for continuity and/or short circuit per wiring diagram. Connector terminal 3 to ECM/test box socket 71 Connector terminal 4 to ECM/test box socket 78 Connector terminal 5 to ECM/test box socket 70

If wiring is OK

1. Replace Motronic ECM -J220-. See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REMOVING AND INSTALLING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__engine-control-module-ecm-without-metal) .
2. Perform adaptation of throttle valve control module to ECM. See «THROTTLE VALVE CONTROL MODULE, ADAPTATION TO ENGINE CONTROL MODULE (ECM)»(ref-216409-S01894933852006012100000) .
3. Check readiness code. See «READINESS CODE»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha) .
4. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. See «READINESS CODE, CHECKING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__readiness-code-checking) .

Scheme 21

1. Disconnect 5-pin connector from ignition coils. (Scheme 22): Identifying Ignition Coil Power Output Stage Harness Connector Terminals
2. Connect VAG1527 LED voltage tester between B+ and terminal 2 (ground) of connector. LED in tester must light up.

If LED does not light up

1. Check wires for open circuit per wiring diagram.

Test requirement

1. Fuse for ignition coils OK

Scheme 22

1. Disconnect 5-pin connector from ignition coils.
2. Switch ignition on. see scheme 24: Identifying Ignition Coil Power Output Stage Harness Connector Terminals
3. Connect VAG1527 LED voltage tester between engine ground and terminal 1 (B+) of connector. LED in tester must light up.

If LED does not light up

1. Check wires for open circuit per wiring diagram.
2. Check fuse for ignition coils.

1. VAG1551 Scan Tool (ST) with VAG1551/3 adapter cable
2. Multimeter US1119 (Fluke 83 or equivalent)
3. VW1594 connector test kit

Function

The camshaft adjustment is dependent on engine speed and load. The electrical solenoid valves for camshaft adjustment (-N205- and -N208 -) are switched to apply oil pressure to the mechanical camshaft adjusters, which adjusts the camshaft timing.

Camshaft adjustment function, checking

1. Connect VAG1551/1552 Scan Tool (ST) and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (engine running at idle). See «VAG1551/VAG1552 SCAN TOOL (ST), CONNECTING AND SELECTING "ENGINE ELECTRONICS" ADDRESS WORD 01»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__vag1551vag1552-scan-tool-st-connecting-and) .

Indicated on display

Checking Camshaft Adjustment Function Using VAG Scan Tool (1 Of 3). Scheme 23

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

Indicated on display

Checking Camshaft Adjustment Function Using VAG Scan Tool (2 Of 3). Scheme 24

1. Press buttons -0-, -9- and -0- to input display group number 90 (090), and press -Q- button to confirm input.

Indicated on display (1-4 - display groups)

Checking Camshaft Adjustment Function Using VAG Scan Tool (3 Of 3). Scheme 25

Note. Display field 2 indicates whether the engine control module has activated the camshaft adjustment.

1. "CS-ctrlOFF:" camshaft adjustment is not active.
2. "CS-ctrlON:" camshaft adjustment is active (this can only be attained during a test drive)

Display fields 3 and 4 show whether the camshaft adjustment did actually occur (via input from sensors)

1. Normal Position: -3.0° to 6.0° KW.
2. Shifted position: 16.0° KW to 25.0° KW.

Note. If, during the test drive, display field 3 and/or 4 displays a value between 6.0° KW and 16.0° KW, the electrical valves for camshaft adjustment have switched the oil pressure to the respective mechanical camshaft adjuster, but it cannot attain the correct end position (e.g. due to sluggishness).

1. Accelerate from rest in 1st gear (manual) or with selector lever in "2" position (automatic).
2. Check specified values for camshaft adjustment (display fields 2-4).

DISPLAY GROUP 90: CAMSHAFT ADJUSTMENT

If specified values are attained

1. Press --> button.
2. Press buttons -0- and -6- to select "End Output" function 06, and press -Q- button to confirm input.

Valves for camshaft adjustment, checking

Note. Installation location, see COMPONENT LOCATIONS

1. Connect VAG1551/1552 Scan Tool (ST) and press buttons -0- and -1- to insert "Engine Electronics" address word 01 (with engine running at idle). See «VAG1551/VAG1552 SCAN TOOL (ST), CONNECTING AND SELECTING "ENGINE ELECTRONICS" ADDRESS WORD 01»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__vag1551vag1552-scan-tool-st-connecting-and). (Scheme 26): Checking Valves For Camshaft Adjustment Using VAG Scan Tool (1 Of 3)

Indicated on display

Scheme 26

1. Press buttons -0- and -3- to select "Output Diagnostic Test Mode" function 03. (Scheme 27): Checking Valves For Camshaft Adjustment Using VAG Scan Tool (2 Of 3)

Indicated on display

Scheme 27

1. Press -Q- button to confirm input. (Scheme 28): Checking Valves For Camshaft Adjustment Using VAG Scan Tool (3 Of 3)

Indicated on display

1. Check using output DTM and activate camshaft adjustment. See «OUTPUT DIAGNOSTIC TEST MODE (SCAN TOOL FUNCTION 03)»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__output-diagnostic-test-mode-scan-tool) . Valves 1 and 2 for camshaft adjustment, -N205- and -N208-, must click audibly.

If the valves do not click

1. Check as described in test procedures that follow.

Scheme 28

1. Disconnect harness connector from valve. (Scheme 29): Checking Solenoid Valve For Camshaft Adjustment Resistance
2. Using multimeter with auxiliary wires from VAG1594, measure resistance across terminals on valve. Specified value: 10 -18 ohms

If resistance is not as specified

1. Replace solenoid valve.

Scheme 29

1. Disconnect harness connector from valve. (Scheme 30): Identifying Solenoid Valve For Camshaft Adjustment Harness Connector Terminals
2. Connect LED tester VAG1527 between engine ground and terminal 1 of connector (B+).
3. Crank starter for several seconds (engine can start). LED in voltage tester must light up.

If LED does not light up, conduct the following tests

1. Check fuse for valves for camshaft adjustment.
2. Check wiring from terminal 1 on 2-pin connector to fuse for continuity per wiring diagram.
3. Check fuel pump relay and signal to relay. See «FUEL PUMP RELAY AND CONNECTIONS, CHECKING»(ref-216409-S16814556772006012100000) .

Scheme 30

1. Disconnect harness connector from valve. see scheme 33: Identifying Solenoid Valve For Camshaft Adjustment Harness Connector Terminals
2. Connect LED tester VAG1527 between connector terminals 1 and 2.
3. Check using output DTM and activate camshaft adjustment. See «OUTPUT DIAGNOSTIC TEST MODE (SCAN TOOL FUNCTION 03)»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__output-diagnostic-test-mode-scan-tool). LED must flash.

If LED does not flash or stays on continuously

1. Connect VAG1598/22 test box to Motronic ECM harness connector ( «VAG1598/22 TEST BOX, CONNECTING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__vag159822-test-box-connecting) ) and proceed as follows

If LED does not flash

1. Check wiring from terminal 2 of connector for valve to terminal 55 of ECM/test box for continuity and short circuit to B+.

If LED stays lit constantly

Identifying ECM Harness Connector Terminals. Scheme 31

1. Check wiring between valve connector terminal 2 and ECM/test box terminal 55 for short circuit to Ground. Specified value: max. 1 ohm.

If the wiring is OK

1. Replace Motronic ECM -J220-. See «ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REMOVING AND INSTALLING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__engine-control-module-ecm-without-metal) .
2. Perform adaptation of throttle valve control module to ECM. See «THROTTLE VALVE CONTROL MODULE, ADAPTATION TO ENGINE CONTROL MODULE (ECM)»(ref-216409-S01894933852006012100000) .
3. Check readiness code. See «READINESS CODE»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha) .
4. If Diagnostic Trouble Code (DTC) memory has been erased, or ECM has been disconnected, generate new readiness code. See «READINESS CODE, CHECKING»(/audi/a6/c5-1997-2001/remont/testing-diagnostics/#on-board-diagnostic-obd-28l-v6-aha__readiness-code-checking) .

If no malfunction has been found in any of the previous tests

1. Replace respective mechanical camshaft adjuster. See «CAMSHAFTS»(ref-147486-S28562019622002091600000) .

See also:
• VAG1598/22 TEST BOX, CONNECTING
• ENGINE CONTROL MODULE (ECM) (WITHOUT METAL ANTI-THEFT HOUSING), REMOVING AND INSTALLING
• READINESS CODE
• READINESS CODE, CHECKING
• VAG1551/VAG1552 SCAN TOOL (ST), CONNECTING AND SELECTING "ENGINE ELECTRONICS" ADDRESS WORD 01
• OUTPUT DIAGNOSTIC TEST MODE (SCAN TOOL FUNCTION 03)
• CAMSHAFT POSITION (CMP) SENSOR 2 -G163-, CHECKING
• CAMSHAFT POSITION (CMP) SENSOR -G40-, CHECKING
• EVALUATION OF DISPLAY GROUPS 22, 23 AND 24
• CONTINUATION
• EVALUATION OF DISPLAY GROUPS 15 AND 16
• IGNITION COILS AND POWER OUTPUT STAGE, CHECKING
• VALVES FOR CAMSHAFT ADJUSTMENT, CHECKING