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Home >> Nissan-Datsun >> 2000 >> Quest GLE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 3.3 >> Diagnostic Tests >> DTC P1447: EVAP Control System Purge Flow Monitoring >> Test Procedure
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Test Procedure

  1. Check EVAP canister for cracks and replace as necessary. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect vacuum hose (on EVAP service port side) from EVAP Canister Purge Volume Control Valve (EVAP-CPVCV). Install vacuum gauge to port on EVAP-CPVCV. Go to next step.
  2. Start engine and let idle for at least 80 seconds. Increase engine speed to 2000 RPM and observe vacuum gauge. Vacuum should exist. Release throttle and let engine idle. Vacuum should not exist. If vacuum is as specified, go to step  5. If vacuum is not as specified, go to next step.
  3. Turn ignition off. Ensure purge hoses are properly routed and connected. Disconnect purge hoses from EVAP-CPVCV. Ensure air flows freely through hoses and intake manifold purge port. If problem exists, repair as necessary. If problem does not exist, go to next step.
  4. Remove EVAP Canister Purge Volume Control Valve (EVAP-CPVCV). Using jumper wires, apply battery voltage and ground to EVAP-CPVCV terminals. See Figure. Check for airflow between ports "A" and "B". Air should flow. Remove jumper wires. Air should not flow. EVAP-CPVCV should switch in one second or less. If EVAP-CPVCV does not operate as specified, replace EVAP-CPVCV. If EVAP-CPVCV operates as specified, go to next step.
  5. Turn ignition off. Check for proper connection and routing of hose connected to EVAP Control System Pressure Sensor (EVAP-CSPS). If problem exists, repair as necessary. If problem does not exist, disconnect EVAP-CSPS harness connector and check for water in connector. If water is present, replace EVAP-CSPS. If water is not present, go to next step.
  6. Check EVAP Control System Pressure Sensor (EVAP-CSPS) function. See DTC CONFIRMATION TEST under DTC P0450: EVAP CONTROL SYSTEM PRESSURE SENSOR (EVAP-CSPS) . If EVAP-CSPS fault is detected, proceed with TEST PROCEDURE under DTC P0450: EVAP CONTROL SYSTEM PRESSURE SENSOR (EVAP-CSPS) . If EVAP-CSPS is okay, go to next step.
  7. Remove EVAP Canister Vent Control Valve (EVAP-CVCV). Using jumper wires, apply battery voltage and ground to EVAP-CVCV terminals. See Figure. Check for airflow between ports "A" and "B". Air should not flow. Remove jumper wires. Air should flow between ports "A" and "B". EVAP-CVCV should switch in one second or less. If EVAP-CVCV does not operate as specified, replace EVAP-CVCV and "O" ring. If EVAP-CVCV operates as specified, go to next step.
  8. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect closed throttle position switch harness connector. Check continuity between closed throttle position 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 continuity is not as specified, replace closed throttle position switch. If continuity is as specified, go to next step.
  9. Check EVAP purge line for leaks. If problem exists, clean or replace as necessary. If EVAP purge line is okay, 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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