DTC P1447: EVAP Control System Purge Flow Monitoring: Procedure
- Check EVAP canister for damage or leaking. See SYSTEM/COMPONENT TESTS article. If canister is okay, go to next step. If canister is not okay, replace as necessary and retest system.
- Start engine and warm to operating temperature. Turn ignition off. Disconnect vacuum hose to EVAP canister purge volume control solenoid valve at EVAP service port and install vacuum gauge. Start engine and let idle for at least 60 seconds. While monitoring vacuum gauge, accelerate engine to 2000 RPM. Release accelerator pedal and note vacuum. Vacuum should exist with engine revved to 2000 RPM and no vacuum should exist at idle. If operation is as specified, go to next step. If operation is not as specified, turn ignition off. Check vacuum lines for clogging and check EVAP canister purge control valve and solenoid valve. See DTC P1492: EVAP CANISTER PURGE CONTROL SOLENOID VALVE and DTC P1493: EVAP CANISTER PURGE CONTROL VALVE . Replace as necessary and retest system.
- Check EVAP canister purge volume control solenoid valve. See DTC P0443 OR P1444: EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE. If EVAP canister purge volume control solenoid valve is okay, check vacuum line to EVAP control system pressure sensor. See Figure. Repair or replace as necessary. If line is okay, check EVAP control system pressure sensor. See DTC P0450: EVAP CONTROL SYSTEM PRESSURE SENSOR . If pressure sensor is okay, go to next step. If pressure sensor is not okay, replace EVAP control system pressure sensor and retest system.
- Check EVAP canister vent control valve and "O" ring. See DTC P0446, P1446 OR P1448: EVAP CANISTER VENT CONTROL VALVE . If valve is okay, check EVAP purge line for damage or leaks. Repair or replace as necessary. If purge line is okay, check harness connectors for terminal damage or corrosion. Repair as necessary and retest system.