P0451

DTC P0451
Fuel tank Pressure Sensor poor performance fault. (Driving Cycle C)

Possible causes by suggested order of priority:
- Fuel tank pressure sensor.
- Hose - fuel pump to pressure sensor.
- ECM.

Fuel tank pressure sensor.
- If TestBook available, it can be used to display the fuel tank pressure as seen by the ECM.
- The force enables the Purge canister closure valve to be opened or closed as required.
- Use the EVAP diagnostic station to measure and diagnose faults in the evaporative emission system as required.
PASS VALUES:
- The fuel pressure should normally read between -5 and 3 KPa.
- With the fuel filler cap removed, the sensor should display a reading equivalent to atmospheric pressure: ± 0.2 KPa.

Hose - fuel pump to pressure sensor.
- If TestBook available, it can be used to display the fuel tank pressure as seen by the ECM.
- The force enables the Purge canister closure valve to be opened or closed as required.
- Use the EVAP diagnostic station to measure and diagnose faults in the evaporative emission system as required.
PASS VALUES:
- The fuel pressure should normally read between -5 and 3 KPa.
- With the fuel filler cap removed, the sensor should display a reading equivalent to atmospheric pressure: ± 0.2 KPa.

ECM.
- No detail available for this fault