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 valve and install vacuum gauge. See Figure. 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. Check EVAP canister purge volume control solenoid valve and canister purge control valve. See DTC P0443 OR P1444: EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE. Replace as necessary and retest system.
- Turn engine off and leave ignition on. Check vacuum line to EVAP control system pressure sensor. See Figure. Repair or replace as necessary. If line is okay, remove pressure sensor with electrical connector connected. Using a vacuum pump, apply 2.8 in Hg (70 mm Hg) to pressure sensor vacuum port. Using DVOM, measure voltage between PCM connector terminal No. 67 and ground by backprobing connector. See Figure. With vacuum applied voltage should be .4-.6 volt and without vacuum applied voltage should be 3.0-3.6 volts. If voltage is as specified, go to next step. If voltage is not as specified, replace 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 pin damage or corrosion. Repair as necessary and retest system.