Evaporative Emissions System: Testing and Inspection

Function Diagram, Purge System Monitoring Pressure/Pressure Switchover





3 Intake manifold
75 Fuel tank
76 Vent valve
77 Charcoal canister
B5/2 Diagnostic pressure sensor
N3/4 Engine control module
N59/1 Diagnostic module (OBD II)
Y27/6 Purge-flow switchover valve
Y58/1 Purge switchover valve
a Barometric pressure

With voltage applied to the purge-flow switchover valve (Y27/6), the diagnostic pressure sensor is connected to the purge switchover valve (Y5811).

With no voltage applied to the purge-flow switchover valve (Y27/6), the diagnostic pressure sensor is connected to the intake manifold (3).