Camshaft Adjustment Valve 1, Checking

Camshaft Adjustment Valve 1, Checking

Observe all safety precautions: => [ Safety Precautions ] Generic Scan Tool

View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

Special tools, testers and auxiliary items required

• Multimeter

• Wiring diagram

Test requirements

• The Camshaft Adjustment Valve 1 (N205) fuse 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.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check

Start diagnosis

- Remove the engine cover with air filter.






- Disconnect Camshaft Adjustment Valve 1 (N205) electrical harness connector - 1 -.






- Using a Multimeter, check the Camshaft Adjustment Valve 1 (N205) pins 1 & 2 for resistance.






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

If the specified value was Not obtained:

- Replace the Camshaft Adjustment Valve 1 (N205).

- Go to Final procedures

If the specified value was obtained:

Checking voltage

- Switch the ignition on.

- Using a Multimeter, Check the Camshaft Adjustment Valve 1 (N205) electrical harness connector terminal 1 to engine ground for voltage.

- Switch the ignition off.

Specified value: battery voltage.

If the specified value was Not obtained:

- Check the wiring connections for an open circuit, short circuit to Ground

- Check the wiring connection for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection and replace any fuse if blown

- Go to Final procedures

If the specified value was obtained:

Checking wiring

- Remove the Motronic Engine Control Module (ECM) (J623).

- Using a Multimeter, Check the Camshaft Adjustment Valve 1 (N205) electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) electrical harness connector T60 terminal 54 for an open circuit.











Specified value: 1.5 ohms Max.

If the specified value was Not obtained:

- Check the wiring connection for an open circuit, short circuit to Battery positive or Ground

- Check the wiring connection for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

- Go to Final procedures

If the specified value was obtained:

- With the Motronic Engine Control Module (ECM) Connectors still unplugged (J623).

- Use a Multimeter, Check the Camshaft Adjustment Valve 1 (N205) electrical harness connector terminal 2 to engine ground for continuity

If Specified value is 1.5 ohms or less

- Check the wiring connection for a short circuit to Engine Ground

- If necessary, repair the faulty wiring or connection, If no faults were found Replace the Motronic Engine Control Module (ECM) (J623).

Final procedures

- Reinstall the engine cover with air filter, if necessary.

- 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 ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Programming and Relearning.