Slight engine tapping valvematic

[Wayne87]

55k miles 1.6 valvematic petrol engine.

Ive noticed a tapping noise coming from the top of the engine towards the back. Mainly on idle, but not all the time. Can also hear it occasionally when driving. It's definitely not an injector tapping noise.

More mechanical I'd say. Are these engine prone to a tapping noise? Possible VVT noise?

Any help would be appreciated.

[Konrad C]

You now know it is normal for the Valvematic engine, due the vacuum pump - needed because the always open throttle means lack of vacuum. 

May be there should be a note about Valvematic engine on the Auris/Avensis/Rav4 forums, explaining the vacuum pump ticking sound as normal.