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DTC P1447: EVAP Control System Purge Flow Monitoring: Procedure

  1. Check EVAP canister for cracks. See Figure. Replace if necessary and retest system. If EVAP canister is not cracked, start engine and warm to normal operating temperature. Turn ignition off. Disconnect hose between EVAP service port and EVAP-CPVCV from EVAP service port. See Figure. Connect vacuum gauge to hose. Start engine and let it idle for at least 80 seconds. Vacuum should exist at hose. If vacuum exists, go to step  3. If vacuum does not exist, go to next step.
  2. Check EVAP-CPVCV hoses for blockage. Repair as necessary and retest system. If hoses are okay, remove EVAP-CPVCV. Using jumper wires, apply battery voltage and ground to EVAP-CPVCV terminals. Air should flow between ports "A" and "B". See Figure. Remove jumper wires. Air should not flow. EVAP-CPVCV should switch in one second or less. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCV and retest system.
  3. Check EVAP-CSPS and circuit. See DTC P0450: EVAP CONTROL SYSTEM PRESSURE SENSOR (EVAP-CSPS) . Repair as necessary and retest system. If EVAP-CSPS and circuit are okay, go to next step.
  4. Remove EVAP-CVCV. Using jumper wires, apply battery voltage and ground to EVAP-CVCV terminals. See Figure. Air should not flow between ports "A" and "B". Remove jumper wires. Air should flow. EVAP-CVCV should switch in one second or less and rust should not exist in port "B". If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CVCV and retest system.
  5. Turn ignition off. Disconnect TP switch harness connector. Check continuity between TP switch terminals No. 5 and 6. See Figure. Continuity should exist when accelerator pedal is released. Continuity should not exist when accelerator pedal is depressed. If operation is as specified, go to next step. If operation is not as specified, replace TP sensor and retest system.
  6. Check purge line for leaks. Repair as necessary and retest system. If no leaks are found, clean purge line with compressed air. Test is complete. Problem may be intermittent. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS - INTRODUCTION article.
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