Typical Malfunction Thresholds

"Saturated" indicates EVAP pressure change is less than 0.75 mmHg (0.1 kPa) for 30 seconds.

1. P2421: Check valve stuck open
   TYPICAL MALFUNCTION THRESHOLDS (CHECK VALVE STUCK OPEN)
   
   

   FTP change for 10 seconds when vacuum pump is turned OFF after leak check

   1.875 mmHg 0.25 kPa) or more

2. P2422: Check valve stuck closed
   TYPICAL MALFUNCTION THRESHOLDS (CHECK VALVE STUCK CLOSED)
   
   

   Either of the condition A and B is set
   0.02 inch leak pressure	Less than -33.75 mmHg (-4.5 kPa) or -7.5 mmHg (-1 kPa) or more
   0.02 inch leak pressure	Not saturated