Variable Valve Timing Solenoid: Adjustments

CPS solenoid

Note! Some variation in the illustrations may occur, but the essential information is always correct.

Removal

Remove the CPS solenoid. Refer to: CPS solenoid




The CPS (Cam Profile Switch) solenoid has four inputs/outputs: (1.) Port T, (2.) Port A (3.) Port T and (4.) Port P




A CPS solenoid does not have a built in spring. It is therefore necessary to press in the valve slightly when fault tracing to get the solenoid to work satisfactorily during the test. Use a short M8 screw or similar.
The lack of a spring also means that it may sound as if there is something loose inside the solenoid if it is shaken. This is completely normal.




Press in the valve slightly.
Blow compressed air into port A (2).
Air should come out through both return holes (1 and 3).
For further function checks continue with step "check function". If the duct seems to be blocked, go to the "cleaning" step.




Press in the valve lightly. Connect current to the solenoid.
The solenoid should click.
It is easier to hear the click when holding the solenoid.
Blow compressed air into the port A (2). Air should come out through the oil feed hole (4).
Note that there may be slight leakage to both the return holes (1 and 3).

Use: Cleaner, 1161826 (EU), 1161828 (US)

Allow the cleaner to act for 5 minutes.
Blow compressed air into all holes from both directions and look for contamination. Carry this out with current on and off to ensure that no dirt remains in the ducts.

Use: Cleaning agent, 1161721
Rinse with cleaner. Blow again.
Regrease the solenoid using engine oil to avoid sticking.
After cleaning, check the function by repeating steps 1 and 2.
If the solenoid still does not work properly after cleaning twice, replace the solenoid.

Installation

To install, reverse the removal procedure.

Erase DTCs and test drive the vehicle.
Check that no new DTCs have been stored.