LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 69 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1446: EVAP Canister Vent Control Valve >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Xterra and 2002 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect hose from EVAP-CVCV. See Figure . Check hose for blockage. If blockage exists, clean hose with compressed air. If blockage does not exist, go to next step.
    2. CAUTION: DO NOT disassemble water separator.
  2. Remove water separator and inspect for cracks or blockage. With water separator port "A" plugged, blow air into port "B". See Figure . Air should flow out of port "C". With port "C" plugged, blow air into port "B". Air should flow out of port "A". If operation is as specified, go to next step. If operation is not as specified, replace water separator.
  3. Remove EVAP-CVCV. Check for rust in port "B". See Figure . If rust exists, replace EVAP-CVCV. If rust does not exist, go to next step.
  4. If using CONSULT-II, go to next step. If using generic scan tool, go to step  6 .
  5. Reconnect all harness connectors. Turn ignition on. Perform VENT CONTROL/V in ACTIVE TEST mode with CONSULT-II. When VENT CONTROL/V is ON, air should not flow between ports "A" and "B". When VENT CONTROL/V is OFF, air should flow between ports "A" and "B". It should take less than one second for valve to open or close. If operation is as specified, go to step  7 . If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
  6. Using jumper wires, apply battery voltage 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 less than one second. If operation is as specified, go to next step. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
  7. Remove EVAP canister with EVAP-CVCV attached. Attempt to drain water from EVAP canister. If water does not drain from EVAP canister, go to step  9 . If water drains from EVAP canister, weigh EVAP canister with EVAP-CVCV attached. If weight is more than 4.0 lbs. (1.8 kg), go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to next step.
  8. Inspect EVAP canister for damage. Replace, if necessary. Also check hose between water separator and EVAP canister for blockage or leak. If a problem is found, repair hose or replace EVAP canister as necessary. If no problem is found, go to next step.
  9. Check for disconnection or improper connection of hose connected to EVAP-CSPS. If a problem is found, repair as necessary. If no problem is found, disconnect EVAP-CSPS harness connector. If water exists in connector, replace EVAP-CSPS. If water does not exist in connector, go to next step.
  10. Check EVAP-CSPS and circuit by performing appropriate DTC CONFIRMATION TEST under DTC P0452 OR DTC P0453: EVAP CONTROL SYSTEM PRESSURE SENSOR. If problem is found, repair as necessary. If problem is not found, go to next step.
  11. No problem is indicated at this time. Problem may be intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
scientia non olet · About LEMON Manuals