Camshaft Adjustment Valve 1 N205 and Camshaft Adjustment Valve 1 (Exhaust) N318 , Checking

Camshaft Adjustment Valve 1 N205 And Camshaft Adjustment Valve 1 (exhaust) N318, Checking

The following procedure is used to diagnose Camshaft Adjustment Valve 1 N205 and Camshaft Adjustment Valve 1 (exhaust) N318 which are controlled by Motronic Engine Control Module (ECM) J623.

Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.

Test requirements
- Fuse S344 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 1 N205 electrical harness connector - 8 -
Or







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

Checking internal resistance







- Using a Multimeter, check the Camshaft Adjustment Valve, for resistance.
Specified value: 5.0 to 8.0 Ohms (at approx. 20 degrees C)

If the specified value was not obtained:
- Replace the faulty Camshaft Adjustment Valve 1 N205 or Camshaft Adjustment Valve 1 (exhaust) N318.

If the specified value was obtained:

Checking voltage
- Switch the ignition on.
- Using a Multimeter, Check the Camshaft Adjustment Valve electrical harness connector terminal 2 to the Motronic 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, 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) J623.







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

Camshaft Adjustment Valve 1 Motronic Engine Control Module
N205 electrical harness (ECM) electrical harness
connector terminal connector T60 terminal or test box socket
1 20

Camshaft Adjustment Valve 1 Motronic Engine Control Module
(exhaust) N318 electrical (ECM) electrical harness
harness connector terminal connector T60 terminal or test box socket
1 21

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) J623.

Final procedures
After 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.

Camshaft Adjustment Valve 2 N208 and Camshaft Adjustment Valve 2 (exhaust) N319, checking

The following procedure is used to diagnose Camshaft Adjustment Valve 2 N208 and Camshaft Adjustment Valve 2 (exhaust) N319 which are controlled by Engine Control Module (ECM) 2 J624.

Special tools, testers and auxiliary items required
- Multimeter.
- Wiring diagram.

Test requirements
- Fuse S344 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 - 2 -.
Or







- Disconnect the Camshaft Adjustment Valve 2 (exhaust) N319 electrical harness connector - 5 -.

Checking internal resistance







- Using a Multimeter, check the Camshaft Adjustment Valve, for resistance.
Specified value: 5.0 to 8.0 Ohms (at approx. 20 degrees C)

If the specified value was not obtained:
- Replace the faulty Camshaft Adjustment Valve 2 N208 or Camshaft Adjustment Valve 2 (exhaust) N319.

If the specified value was obtained:

Checking voltage
- Switch the ignition on.
- Using a Multimeter, Check the Camshaft Adjustment Valve electrical harness connector terminal 2 to the Motronic 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, 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 Engine Control Module (ECM) 2 J624.







- Using a Multimeter, Check the Camshaft Adjustment Valve electrical harness connector terminal 1 to the Engine Control Module (ECM) 2 J624 electrical harness connector T60a for an open circuit.

Camshaft Adjustment Valve 2 Engine Control Module (ECM)
N208 electrical harness 2 J624 electrical harness
connector terminal connector T60a terminal or test box socket
1 20

Camshaft Adjustment Valve 2 Engine Control Module (ECM)
(exhaust) N319 electrical 2 J624 electrical harness
harness connector terminal connector T60a terminal or test box socket
1 21

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 Engine Control Module (ECM) 2 J624.

Final procedures
After 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.