Camshaft Adjustment Valve 2

The following procedure is used to diagnose Camshaft Adjustment Valve 2 N208 which is controlled by Engine Control Module (ECM) 2 J624.

Special tools, testers and auxiliary items required 

• Multimeter.
• Wiring diagram.

Test requirements 

• Fuse SC8 OK.
• Motronic Engine Control Module (ECM) Power Supply Relay J271 OK.
• Battery voltage at least 12.5 volts.
• 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.

Procedure 

• Disconnect the Camshaft Adjustment Valve 2 N208 electrical harness connector - 3  -

Checking internal resistance 

• Using a Multimeter, check the Camshaft Adjustment Valve 2 N208 terminals 1 to 2 for resistance.

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

If the specified value was not obtained:

• Replace Camshaft Adjustment Valve 2 N208. Refer to → .

If the specified value was obtained:

Checking voltage 

• Switch the ignition on.
• Using a Multimeter, Check the Camshaft Adjustment Valve 2 N208 electrical harness connector terminal 2 to Ground (GND) for voltage.
• Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained:

• Check the wiring connection from the Camshaft Adjustment Valve 2 N208 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 2/87 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 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 → .

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

• Remove the Engine Control Module (ECM) 2 J624. Refer to → .

• Using a Multimeter, check the Camshaft Adjustment Valve 2 N208 electrical harness connector terminal 1 to the Engine Control Module (ECM) 2 J624 electrical harness connector T60d for an open circuit.

Camshaft Adjustment Valve 2 N208 electrical harness connector terminal	Engine Control Module (ECM) 2 J624 electrical harness connector T60d terminal or test box socket
1	20

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) 2 J624. Refer to → .
• 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 - Erase DTC Memory .
3. If the DTC memory was erased, generate readiness code. Refer to Readiness Code .

• End of diagnosis.