P0451

Schematic:

The fuel tank pressure sensor measures the pressure changes within the EVAP system. The sensor signal is monitored for rationality as well as electronic functionality. The rationality diagnostic is only performed at idle after a cold start. In this case, the pressure will be monitored. If the pressure exceeds 250 kPa for longer than 15 seconds, the ECM will set this code.

DTC PARAMETERS
DTC P0451 will when:
^ Sensor signal value greater than 250 kPa for longer than 10 seconds
^ Engine speed = Idle
^ Engine temperature at start less than 33°C (91°F)

DTC P0451 is a (type B) DTC.

DIAGNOSTIC AIDS
Possible causes:
^ Skewed or stuck fuel tank pressure sensor
^ Intermittent open in signal circuit
^ Intermittent open in return circuit