Solenoid valves for camshaft adjustment, checking

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 Audi S4, 2008 Audi S4, 2007 Audi S4, 2006 Audi S4, and 2005 Audi S4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Special Tools - Solenoid Valves For Camshaft Adjustment, Checking

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Special tools, testers and auxiliary items required

Hand multimeter V.A.G 1526 B or V.A.G 1526 A
Voltage tester V.A.G 1527 B
Connector test kit V.A.G 1594 C or V.A.G 1594 A
Test box 1598/31

Vehicle Diagnostic, Testing and Information System VAS 5051 A with diagnostic cable VAS 5051/1

Preparation

Cylinder bank 1 (right):

Fig 2: Removing Bracket For Electrical Harness Connectors At Right From Bulkhead

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect electrical harness connector - 3 - to Camshaft Adjustment Valve 1 N205.

Cylinder bank 2 (left):

Fig 3: Removing Coolant Hoses & Coolant Expansion Tank

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Remove coolant expansion tank bolt - arrow -.
Disconnect electrical wire from Engine Coolant Level (ECL) Warning Switch F66 and set aside coolant reservoir with coolant hoses - 1 - and - 2 - connected.

Fig 4: Disconnecting Electrical Harness Connector To Camshaft Adjustment Valve 2 N208

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect electrical harness connector - 2 - to Camshaft Adjustment Valve 2 N208.

Checking internal resistance

Fig 5: Identifying Exhaust Flap Valve 1 N321 Terminals

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Connect multimeter to valve for resistance measurement.

Specification: 8 to 13 Ω.

If specification is not obtained:

Replace valve.

If specified value is not achieved:

Checking voltage supply

Fuse for valve for camshaft adjustment is OK → Electrical Wiring Diagrams, Troubleshooting and Component Locations.
Motronic Engine Control Module (ECM) Power Supply Relay J271 OK.

NOTE:

Voltage for camshaft adjustment valves is supplied via Motronic Engine Control Module (ECM) Power Supply Relay J271.

Fig 6: Identifying 2-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect voltage tester V.A.G 1527 B as follows:

Harness connector Terminal	Measure to
- 1 -	Engine Ground (GND)

Operate starter briefly.

LED must light up.

If LED does not light up:

Check wire connection from terminal 1 of electrical harness connector via fuse to Motronic Engine Control Module (ECM) Power Supply Relay J271 for open circuit according to wiring diagram.
Repair wire connection if necessary.

If LED lights up:

Check activation

Fig 7: Identifying 2-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect voltage tester V.A.G 1527 B to terminals - 1 - (B+) and - 2 - of electrical harness connector.
Connect Vehicle Diagnostic, Testing and Information System VAS 5051 and select vehicle system "01 - engine electronics". Ignition must be switched on Guided Fault Finding in VAS 5051.

Fig 8: Diagnostic System VAS 5051: Display

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Display on VAS 5051 :

In selection - 1 - , click on the function "03 - output Diagnostic Test Mode (DTM)".
Press → button repeatedly until Camshaft Adjustment Valve 1 N205 is activated.

LED must blink.

Press → button repeatedly until Camshaft Adjustment Valve 2 N208 is activated.

LED must blink.

End function "03 - output Diagnostic Test Mode (DTM)" by pressing ← button.
Select "06 - End Output".
Switch off ignition.

If LED does not blink or it remains lit:

Fig 9: Connecting Test Box VAG1598/31 To Engine Control Module Wiring Harness

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Connect test box V.A.G 1598/31 to wiring harness connectors, Engine Control Module (ECM) is not connected. Connect Ground (GND) clip at test box (not visible in illustration) to Ground (GND) → 24 MULTIPORT FUEL INJECTION (MFI) .

CAUTION: To avoid damaging electronic components, set measuring range before connecting test leads and observe all test requirements.

Fig 10: Identifying 2-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Check following wire connections for open circuit and short circuit to Ground (GND) and B+:

Camshaft Adjustment Valve 1 N205

Harness connector Terminal	Test box V.A.G 1598/31 Socket
- 2 -	115

Camshaft Adjustment Valve 2 N208

Harness connector Terminal	Test box V.A.G 1598/31 Socket
- 2 -	120

Repair wire connection if necessary.

If wiring connection is OK:

Replace Engine Control Module (ECM) → 24 MULTIPORT FUEL INJECTION (MFI) .

If no malfunctions are detected:

Replace mechanical camshaft adjuster → Camshafts, removing and installing .