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Variable Valve Timing Actuator: Testing and Inspection



Camshaft Adjustment Valve, Checking

Camshaft Adjustment Valve 1, Checking

NOTE: Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Camshaft Adjustment Valve 1 N205.

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

Test requirements
- Motronic Engine Control Module (ECM) J220 Fuses 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. General Diagnosis

Start diagnosis







- Disconnect Camshaft Adjustment Valve 1 N205 electrical harness connector - 3 -.







- Using a Multimeter , check the Camshaft Adjustment Valve 1 N205 electrical terminals 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 1 to Ground (GND) for voltage.
- Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained:
- Check the Camshaft Adjustment Valve 1 N205 electrical harness connector terminal 1 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 electrical harness connector 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 VAG1598/31.

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) J220 electrical harness connector for resistance.

Camshaft Adjustment Valve Motronic Engine Control Module (ECM)
1 N205 electrical J220 electrical harness connector terminal
harness connector terminal or 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 electrical harness connector for damage, corrosion, loose or broken terminals.
- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK:
- Replace the Camshaft Adjustment Valve 1 N205.
- Erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
- Perform a road test to verify repair.

If the DTC does not return:
Repair complete, Generate readiness code. Readiness Code
- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the Ground activation was not OK:
- Replace the Motronic Engine Control Module (ECM) J220.
- Assembly is performed in the reverse of the removal.

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 1 Exhaust, Checking

NOTE: Use only gold-plated terminals when servicing terminals in the electrical harness connectors of the Camshaft Adjustment Valve 1 (exhaust) N318.

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

Test requirements
- Fuse SB7 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. General Diagnosis

Start diagnosis







- Disconnect Camshaft Adjustment Valve 1 (exhaust) N318 electrical harness connector - 4 -.







- Using a Multimeter, check the Camshaft Adjustment Valve 1 (exhaust) N318 electrical terminals 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 (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 1 to Ground (GND) for voltage.
- Switch the ignition off.

Specified value: battery voltage.

If the specified value was not obtained:
- Check the Camshaft Adjustment Valve 1 (exhaust) N318 electrical harness connector terminal 1 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 electrical harness connector 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 VAG1598/31.

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 (exhaust) N318 electrical harness connector terminal 2 to the Motronic Engine Control Module (ECM) J220 electrical harness connector for resistance.

Camshaft Adjustment Valve Motronic Engine Control Module (ECM)
1 N318 electrical J220 electrical harness connector terminal
harness connector terminal or test box socket
2 120

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 electrical harness connector for damage, corrosion, loose or broken terminals.
- If necessary, repair the faulty wiring connection.

If no malfunction is found in the wiring and voltage supply was OK:
- Replace the Camshaft Adjustment Valve 1 (exhaust) N318.
- Erase the DTC memory. Diagnostic Mode 04 - Erase DTC Memory
- Perform a road test to verify repair.

If the DTC does not return:
Repair complete, Generate readiness code.
- End diagnosis.

If the DTC does return and no malfunction is detected in the wiring and the Ground activation was not OK:
- Replace the Motronic Engine Control Module (ECM) J220.
- Assembly is performed in the reverse of the removal.

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.
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