Variable Valve Timing Actuator: Testing and Inspection

VTC Actuator Inspection
1. Remove the cylinder head cover.
2. Remove the auto-tensioner.
3. Loosen the rocker arm adjusting screws (see step 2).
4. Remove the camshaft holder (see step 3).
5. Remove the intake camshaft.
6. Check that the variable Valve Timing Control (VTC) actuator is locked by turning the VTC actuator clockwise and counterclockwise. If the VTC actuator is not locked, replace the VTC actuator.





7. Seal the advance holes (A) and retard holes (B) in the No. 1 camshaft journal with tape.
8. Punch a hole in the tape over one of the advance holes.





9. Apply air to the advance hole to release the lock.





10. Check that the VTC actuator moves smoothly. If the VTC actuator does not move smoothly, replace the VTC actuator.