OBD-II Trouble Code

P1447

P1447 - Evaporative Emission (EVAP) Control System, Purge Flow Monitor

P1447 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.

Symptoms

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

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.

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

Possible Solution

Editor Notes