Variable Valve Timing Actuator: Testing and Inspection

Camshaft Adjustment Valve, Checking

Camshaft Adjustment Valve 1

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

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• Fuse (SA3) 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 - 2 -





Checking internal resistance

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





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

If the specified value was not obtained:

- Replace 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 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 1 (N205) 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.

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

- Remove the Motronic Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Removing and Installing ] Engine Control Module, Removing and Installing.

- Using a Multimeter, check the Camshaft Adjustment Valve 1 (N205) electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T60a 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 (+) 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). Refer to => [ Engine Control Module, Removing and Installing ] Engine Control Module, Removing and Installing.

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. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

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

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

- End of diagnosis.

Camshaft Adjustment Valve 1

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

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• Fuse (SA3) 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 (exhaust) (N318) electrical harness connector - 1 -





Checking internal resistance

- Using a Multimeter, check the Camshaft Adjustment Valve 1 (exhaust) (N318) terminals 1 to 2 for resistance.





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

If the specified value was not obtained:

- Replace 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 1 (exhaust) (N318) 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 1 (exhaust) (N318) 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.

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

- Remove the Motronic Engine Control Module (ECM) (J623). Refer to => [ Engine Control Module, Removing and Installing ] Engine Control Module, Removing and Installing.

- Using a Multimeter, check the Camshaft Adjustment Valve 1 (exhaust) (N318) electrical harness connector terminal 1 to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T60a 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 (+) 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). Refer to => [ Engine Control Module, Removing and Installing ] Engine Control Module, Removing and Installing.

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. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

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

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

- End of diagnosis.

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 (SA3) 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 ohms (at approx. 20° C)

If the specified value was not obtained:

- Replace Camshaft Adjustment Valve 2 (N208).

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.

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

- Remove the Engine Control Module (ECM) 2 (J624). Refer to => [ Engine Control Module, Removing and Installing ] Engine Control Module, Removing and Installing.

- 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 T60b 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 (+) 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 => [ Engine Control Module, Removing and Installing ] Engine Control Module, Removing and Installing.

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. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

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

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

- End of diagnosis.

Camshaft Adjustment Valve 2

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

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• Fuse (SA3) 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 (exhaust) (N319) electrical harness connector - 4 -





Checking internal resistance

- Using a Multimeter, check the Camshaft Adjustment Valve 2 (exhaust) (N319) terminals 1 to 2 for resistance.





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

If the specified value was not obtained:

- Replace 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 2 (exhaust) (N319) 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 (exhaust) (N319) 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.

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

- Remove the Engine Control Module (ECM) 2 (J624). Refer to => [ Engine Control Module, Removing and Installing ] Engine Control Module, Removing and Installing.

- Using a Multimeter, check the Camshaft Adjustment Valve 2 (exhaust) (N319) electrical harness connector terminal 1 to the Engine Control Module (ECM) 2 (J624) electrical harness connector T60b 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 (+) 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 => [ Engine Control Module, Removing and Installing ] Engine Control Module, Removing and Installing.

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. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.

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

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.

- End of diagnosis.