Camshaft Adjustment Valve 1 N205 , Checking

Camshaft Adjustment Valve 1 N205, Checking

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, checking.
- 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







- 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 to 2, for resistance.
Specified value: 5.0 to 8.0 Ohms (at approx. 20 degrees C)

If the specified value was not obtained:
- Replace the Camshaft Adjustment Valve 1 N205.

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 pin 1 ground.
- Switch the ignition off.
Specified value: battery voltage.

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 the specified value was obtained:

Checking wiring
If the manufacturers test box is being used. Perform the following step.
- Install the test box.

If the manufacturers test box is not being used. Perform the following step.
- Remove the Motronic Engine Control Module (ECM) J220.







- 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 terminal 115 for an open circuit.

Camshaft Adjustment Valve Motronic Engine Control
1 N205 electrical harness Module (ECM) electrical harness
connector terminal test box socket
2 115

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 (+) 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 Motronic Engine Control Module (ECM) J220
- Install the engine cover with air filter.

Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Diagnostic Mode 03 - Read DTC Memory
2. If necessary, erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
3. If the DTC memory was erased, generate readiness code.

- End of diagnosis.