System Description/Monitoring Procedure
WARNING: This page is about a different car, the 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.
For PCV monitor, ECM monitors if there is air leakage between PCV on the cylinder head cover and intake manifold. If air is leaked, ECM detects a shift of the short term fuel trim, a fluctuation of engine speed, and a difference of manifold pressure.