Variable Valve Timing Actuator: Testing and Inspection
Camshaft Adjustment Valve, Checking
This procedure is used to check the Camshaft Adjustment Valves (N205, N208, N318, N319).
Special tools, testers and auxiliary items required
• Multimeter (V.A.G 1526 A) or equivalent.
• Voltage Tester (VAG1527B) or equivalent.
• Test Box 105 Pin (VAG1598/42).
• Adapter Lead Vag1598/39 (VAG1598/39-1).
Test requirements
• The Camshaft Adjustment Valves fuses OK.
• Ignition switched off.
• the Engine Control Module (ECM) Power Supply Relay (J271) OK.
• Voltage for camshaft adjustment solenoid valves is supplied by the Engine Control Module (ECM) Power Supply Relay (J271).
Test procedure
- Perform a preliminary check to verify the customers complaint. Refer to => [ General Diagnosis ] General Diagnosis.
Start diagnosis
- Remove the front engine cover - arrows -.
- Remove the rear engine cover - arrows -.
Cylinder bank 1 (right)
- Disconnect the Camshaft Adjustment Valve 1 (exhaust) (N318) electrical harness connector or - 1 - the Camshaft Adjustment Valve 1 (N205)- 2 -.
Cylinder bank 2 (left)
- Remove the screw - arrow - retaining the coolant reservoir.
- Disconnect the Engine Coolant Level (ECL) Warning Switch (F66) electrical harness connector from the bottom of the coolant reservoir and set aside the coolant reservoir with the coolant hoses - 1 - and - 2 - connected.
- Disconnect the Camshaft Adjustment Valve 2 (N208 ) electrical harness connector - 2 - or the Camshaft Adjustment Valve 2 (exhaust) (N319)- 3 -.
Checking internal resistance
- Using a Multimeter, check the Camshaft Adjustment Valve for resistance.
Specified value: 5.0 to 8.0 ohms (at approx. 20° C)
If the specified value was not obtained:
- Replace the faulty Camshaft Adjustment Valve Refer to Fuel Injection and Ignition Repair Information.
If the specified value was obtained:
Checking voltage
- Switch the ignition on.
- Using a Multimeter, Check the Camshaft Adjustment Valve electrical harness connector terminal 1 to the 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 or a short circuit 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. Refer to Fuel Injection and Ignition Repair Information.
If the manufacturers test box is not being used. Perform the following step.
- Remove the Engine Control Module (ECM) (J623 ). Refer to => [ ECM, Removing and Installing ] ECM, Removing and Installing.
- Using a Multimeter, Check the Camshaft Adjustment Valve electrical harness connector terminal 2 to the Engine Control Module (ECM) (J623) electrical harness connector T60 terminal 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) (J623 ). Refer to => [ ECM, Removing and Installing ] ECM, 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. => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Mode 03 - Read DTC Memory.
2. If necessary, erase the DTC memory. => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Mode 04 - Erase DTC Memory.
3. If the DTC memory was erased, generate readiness code. => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.
- End of diagnosis.