PCV System Monitor (GTDI With Speed Density)

The PCV Inlet Tube has a no-tool quick disconnect on either end. Disconnection causes a 10.92 mm diameter leak into the intake manifold from atmosphere. The idle speed control is largely under control if an intake manifold leak exists. A persistent intake manifold leak would simply increase fuel consumption at idle and raise the engine idle speed slightly. A disconnection in the PCV inlet tube is made detectable by insuring that if it is disconnected a large (detectable) leak results. The PCV valve is semi-permanently affixed to the external oil separator. Both right and left valve covers contain internal oil separators. Overcoming the toque provided by the locking tabs allows removal via a turn. It is replaceable, but needs to be "torqued out" of the assembly. Mechanically, the hose is easy to disconnect (detectable disconnection) and the PCV valve is difficult to disconnect (undetectable disconnection).

The detection method compares engine air flow rate as computed from the speed density air charge calculation with the throttle air flow rate. Should the air entering the engine exceed the air through the throttle by a threshold amount, a leak is detected.

Fig 1: Mode $06 Data For PCV System Monitor (GTDI With Speed Density) (1 of 2)

Courtesy of FORD MOTOR CO.

Fig 2: Mode $06 Data For PCV System Monitor (GTDI With Speed Density) (2 of 2)

Courtesy of FORD MOTOR CO.