Possible causes

– EVAP canister purge volume control solenoid valve stuck closed
– EVAP control system pressure sensor and the circuit
– Loose, disconnected or improper connection of rubber tube
– Blocked rubber tube
– Cracked EVAP canister
– EVAP canister purge volume control solenoid valve circuit
– Closed throttle position switch
– Blocked purge port
– Closed throttle position switch

When is the code detected?

Under normal conditions (non-closed throttle), sensor output voltage indicates if pressure drop and purge flow are adequate. If not, a fault is determined. Malfunction is detected when EVAP control system does not operate properly, EVAP control system has a leak between intake manifold and EVAP control system pressure sensor.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P1447 NISSAN Description

In this evaporative emission (EVAP) control system, purge flow occurs during non-closed throttle conditions. Purge volume is related to air intake volume. Under normal purge conditions (non-closed throttle), the EVAP canister purge volume control solenoid valve is open to admit purge flow. Purge flow exposes the EVAP control system pressure sensor to intake manifold vacuum.