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 V.A.G 1526 A or equivalent.
• Voltage Tester VAG1527B or equivalent.
• Test Box 105 Pin VAG1598/42.
• Adapter Lead VAG1598/39 VAG1598/39-1.

Test requirements 

• The Camshaft Adjustment Valves fuses OK.
• Ignition switched off.
• The Engine Control Module (ECM) Power Supply Relay J271 OK.

Test procedure 

• Perform a preliminary check to verify the customers complaint. Refer to → General Diagnosis .

Start diagnosis 

Fig 1: Identifying Front Engine Cover

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• Remove the front engine cover - arrows  -.

Fig 2: Removing/Installing Rear Engine Cover

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• Remove the rear engine cover - arrows  -.

Cylinder bank 1 (right) 

Fig 3: Disconnecting Electrical Harness Connectors

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• Disconnect the Camshaft Adjustment Valve 1 (exhaust) N318 electrical harness connector or - 1  - the Camshaft Adjustment Valve 1 N205 - 2  -.

Cylinder bank 2 (left) 

Fig 4: Removing Coolant Hoses At Coolant Expansion Tank

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

Fig 5: Disconnecting Electrical Harness Connectors

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• Disconnect the Engine Coolant Level (ECL) Warning Switch F66 electrical harness connector from the bottom of the coolant reservoir and set aside the coolant reservoir with the coolant hoses - 1  - and - 2  - connected.
• Disconnect the Camshaft Adjustment Valve 2 N208 electrical harness connector - 2  - or the Camshaft Adjustment Valve 2 (exhaust) N319 - 3  -.

Checking internal resistance 

Fig 6: Identifying 2-Pin Electrical Harness Connector

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• Using a Multimeter , check the Camshaft Adjustment Valve for resistance.

Specified value: 5.0 to 8.0 Ω (at approx. 20°C)

If the specified value was not obtained:

• Replace the faulty Camshaft Adjustment Valve → 15 - ENGINE - CYLINDER HEAD, VALVETRAIN .

If the specified value was obtained:

Checking voltage 

• Switch the ignition on.
• Using a Multimeter , Check the Camshaft Adjustment Valve electrical harness connector terminal 1 to the Engine Control Module (ECM) Power Supply Relay J271 terminal 2/87 for voltage.
• Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained:

• Check the wiring connection for an open circuit or a short circuit Ground (GND).
• Check the wiring connection for damage, corrosion, lose or broken terminals.
• If necessary, repair the faulty wiring connection.

If the specified value was obtained:

Checking wiring 

If the manufacturers test box is being used. Perform the following step.

• Install the test box. 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 (ECM) J623 , Removing and Installing .

Fig 7: Identifying 2-Pin Electrical Connector & Terminals

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• Using a Multimeter , Check the Camshaft Adjustment Valve electrical harness connector terminal 2 to the Engine Control Module (ECM) J623 electrical harness connector T60 terminal for an open circuit.

Specified value: 1.5 Ω Max.

If the specified value was not obtained:

• Check the wiring connection for an open circuit, short circuit to Battery (+) or Ground (GND).
• Check the wiring connection for damage, corrosion, lose or broken terminals.
• If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was not OK:

• Replace the Engine Control Module (ECM) J623. Refer to → Engine Control Module (ECM) J623 , Removing and Installing .

Assembly is performed in the reverse order of removal.

Final procedures 

After 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 .

• End of diagnosis.