Camshaft Adjustment Valve, Checking

This procedure is used to check the Camshaft Adjustment Valves -N205, N208, N318, N319-.

Special tools and workshop equipment required 

• Multimeter.
• Diode test lamp.
• Wiring diagram.

Test Requirements 

• The Engine Control Module (ECM) -J623- fuses OK.
• Engine Control Module (ECM) Power Supply Relay -J363- OK.
• Battery voltage at least 12.5 V.
• All electrical consumers such as, lights and rear window defroster, switched off.
• Vehicles with automatic transmission, shift selector lever into position "P" or "N".
• A/C switched off.
• Ground (GND) connections between engine/transmission/chassis OK.
• Ignition switched off.

Test Procedure 

-- Perform a preliminary check to verify the customer's complaint. Refer to PRELIMINARY CHECK .

Cylinder bank 1 (right):

-- Disconnect the electrical harness connectors from Camshaft Adjustment Valve 1 (exhaust) -N318- -1- and Camshaft Adjustment Valve 1 -N205- -2-.

Cylinder bank 2 (left):

-- Remove the screw -arrow- retaining the coolant reservoir.

-- Disconnect the electrical connector from Engine Coolant Level (ECL) Warning Switch -F66- at the bottom of the coolant reservoir and set aside the coolant reservoir with the coolant hoses -1- and -2- connected.

-- Disconnect the electrical harness connectors from Camshaft Adjustment Valve 2 (exhaust) -N319- -3- and Camshaft Adjustment Valve 2 -N208- -2-.

Checking internal resistance

-- Using a Multimeter, check the relevantCamshaft Adjustment Valve -- electrical terminals 1 to 2 for resistance.

Specified value: 8 to 13 Ω.

If specified value is not obtained:

-- Replace the respective Camshaft Adjustment Valve --. Refer to Component Locations Overview .

If specified value is obtained:

Checking voltage supply

-- Using theDiode test lamp, check the following wiring connection for voltage according to the wiring diagram.

Camshaft Adjustment ValveElectrical Harness Connector Terminal	Measure to
1	Engine Ground (GND)

-- Switch ignition on.

LED must light up.

If LED does not light up:

-- Check wiring connection from terminal 1 of the Camshaft Adjustment Valve electrical harness connector through the fuse to the Engine Control Module (ECM) Power Supply Relay -J363- electrical harness connector terminal 2/87 for an open circuit according to wiring diagram:

Specified value: 1.5 Ω max.

-- If necessary, repair the wiring connection.

If voltage supply is OK:

Checking wiring

If the manufacturers test box is being used, perform the following step.

-- Install the test box VAG1598/42. Refer to Component Locations Overview .

If the manufacturers test box is not being used, perform the following step.

-- Remove the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING .

-- Using a Multimeter, Check the Camshaft Adjustment Valve -- electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness connector for resistance.

• Camshaft Adjustment Valve 1 -N205- (bank 1).

Camshaft Adjustment ValveElectrical Harness Connector Terminal	Engine Control Module (ECM)J623Wiring Harness Connector Terminal or Test box Socket
2	51

• Camshaft Adjustment Valve 1 (exhaust) -N318- (bank 1).

Camshaft Adjustment ValveElectrical Harness Connector Terminal	Engine Control Module (ECM)J623Wiring Harness Connector Terminal or Test box Socket
2	27

• Camshaft Adjustment Valve 2 -N208- (bank 2).

Camshaft Adjustment ValveElectrical Harness Connector Terminal	Engine Control Module (ECM)J623Wiring Harness Connector Terminal or Test box Socket
2	74

• Camshaft Adjustment Valve 2 (exhaust) -N319- (bank 2).

Camshaft Adjustment ValveElectrical Harness Connector Terminal	Engine Control Module (ECM)J623Wiring Harness Connector Terminal or Test box Socket
2	39

Specified value: 1.5 Ω max.

If the specification is not obtained:

-- Check the wiring for a short circuit to Battery positive (+) or an open circuit.

-- If necessary, repair the wiring connection.

If no malfunctions are found in the wiring:

-- Replace the Engine Control Module (ECM) -J623-. Refer to ENGINE CONTROL MODULE, REPLACING 

If no malfunctions are detected:

-- Replace the relevant Camshaft Adjustment Valve. Refer to Component Locations Overview .

Assembly is performed in the reverse order of removal.

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

1. Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
2. If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
3. If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .