System Inspection

P0451 Evaporative Emission System-Pressure Sensor Range / Performance

Inspection/Repair - System Inspection

Fuel Filler Cap Inspection

1. Check fuel filler cap for being tightly installed, has o-ring seal installed and is in good condition.
2. Verify cap releases pressure / vacuum at specified values

Specification : Approx. 2 psi pressure and approximately 1.5 inches of mercury vacuum).

3. Are cap, o-ring and release pressures okay?










Fuel Tank Pressure Sensor Inspection

1. Ignition "ON" & Engine "OFF".
2. Disconnect hose connecting FTPS to the Fuel Tank.
3. Using a vacuum pump, apply vacuum to the hose connecting to FTPS.
4. Measure FTPS output voltage between signal terminal of the FTPS harness connector and chassis ground.

Specification : Voltage increases proportionally with decreasing pressure.





5. Is voltage within the specification?