Camshaft Adjustment Valve 1 N205, Checking

Special tools and workshop equipment required 

• Multimeter.
• Wiring diagram.

Test requirements 

• The Camshaft Adjustment Valve 1 -N205- fuse OK.
• Fuel Pump (FP) Relay -J17- OK, checking. Refer to the appropriate SYSTEM WIRING DIAGRAMS information.
• 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

Procedure 

-- Remove the engine cover with air filter.

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

-- Using a Multimeter, check the Camshaft Adjustment Valve 1 -N205- for resistance.

Specified value: 10.0 to 18.0 Ω (at approx. 20° 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 1 to ground (GND) 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, short circuit to Battery (+) or Ground (GND).

-- Check the wiring connection for damage, corrosion, loose 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-. Refer to MOTRONIC ENGINE CONTROL MODULE J220, REPLACING .

-- 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 T121 terminal 115 for an open circuit.

Camshaft Adjustment Valve 1 -N205- electrical harness connector terminal	Motronic Engine Control Module (ECM) electrical harness connector T121 terminal or test box socket
2	115

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, loose or broken terminals.

-- If necessary, repair the faulty wiring connection.

-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY

-- Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code. Refer to READINESS CODE .

-- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the voltage supply was OK:

-- Replace the Motronic Engine Control Module (ECM) -J220-. Refer to MOTRONIC ENGINE CONTROL MODULE J220, REPLACING .

-- 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. Refer to DIAGNOSTIC MODE 03 - READ 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.