Camshaft Adjustment Valve, Checking

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

Special tools, testers and auxiliary items 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 customers 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 relevant Camshaft 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 24 - FUEL INJECTION SYSTEM .

If specified value is obtained:

Checking voltage supply 

• Using the Diode test lamp , check the following wiring connection for voltage according to the wiring diagram.

Camshaft Adjustment Valve Electrical 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 24 - FUEL INJECTION SYSTEM .

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 Valve Electrical Harness Connector Terminal	Engine Control Module (ECM) J623 Wiring Harness Connector Terminal or Test box Socket
2	51

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

Camshaft Adjustment Valve Electrical Harness Connector Terminal	Engine Control Module (ECM) J623 Wiring Harness Connector Terminal or Test box Socket
2	27

• Camshaft Adjustment Valve 2 N208 (bank 2).

Camshaft Adjustment Valve Electrical Harness Connector Terminal	Engine Control Module (ECM) J623 Wiring Harness Connector Terminal or Test box Socket
2	74

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

Camshaft Adjustment Valve Electrical Harness Connector Terminal	Engine Control Module (ECM) J623 Wiring 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 24 - FUEL INJECTION SYSTEM .

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.
2. If necessary, erase the DTC memory. Refer to Diagnostic Mode 04 - Reset/Delete Diagnostic Data .
3. If the DTC memory was erased, generate readiness code. Refer to Readiness Code .