LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 38 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1444: EVAP Canister Purge Volume Control Solenoid Valve >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Maxima and 2002 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect EVAP-CPVCSV harness connector. See Figure . Turn ignition on. Measure voltage between ground and EVAP-CPVCSV harness connector terminal No. 2 (Red/Yellow wire). If battery voltage exists, go to step  3 . If battery voltage does not exist, go to next step.
  2. Check the following:
    • Check for poor connection at Black, 8-pin connector F18 terminal No. 4 (Red wire). See Figure . For location, see Figure or Figure .
    • Check for poor connection at Green, 8-pin connector F56 (on I35) or F58 (on Maxima) terminal No. 4 (Red wire). See Figure . Connector F56 or F58 is located on top front of engine. See Figure or Figure .
    • Check for open or short between EVAP-CPVCSV and ECM relay. See WIRING DIAGRAMS article.

    Repair as necessary.

  3. Turn ignition off. Disconnect ECM harness connector. See Figure . Check continuity of Purple/Red wire between EVAP-CPVCSV harness connector terminal No. 1 and ECM harness connector terminal No. 10. See Figure . Also, check circuit for short to ground and short to voltage. If problem is found, go to next step. If problem is not found, go to step  5 .
  4. Check the following:
    • Check for poor connection at Green, 8-pin connector F56 (on I35) or F58 (on Maxima) terminal No. 3 (Purple/Red wire). See Figure . Connector F56 or F58 is located on top front of engine. See Figure or Figure .
    • Check for open or short between EVAP-CPVCSV and ECM.

    Repair as necessary.

  5. Check for disconnection or improper connection of hose connected to EVAP-CSPS. See Figure . If problem is found, repair as necessary. If problem is not found, go to next step.
  6. Disconnect EVAP-CSPS harness connector. Check connectors for water. If water exists, replace EVAP-CSPS. If water does not exist, go to next step.
    7. CAUTION: DO NOT apply more than 5.91 in. Hg (20 kPa) of vacuum to EVAP-CSPS. Replace EVAP-CSPS if it has been dropped from a height of more than 20" (.5 m) onto a hard surface such as concrete.
    CAUTION: DO NOT use ECM ground terminals when measuring voltage.
  7. Remove EVAP-CSPS with its harness connector connected. Turn ignition on. Using a hand vacuum pump, apply 2.76 in. Hg (9.3 kPa) of vacuum to EVAP-CSPS. Measure voltage between ground and ECM terminal No. 60 (White wire) by backprobing. See Figure and Figure . Voltage should be .4-.6 volt. Disconnect vacuum pump. Voltage should be 3.0-3.6 volts. If voltage is as specified, go to next step. If voltage is not as specified, replace EVAP-CSPS.
  8. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step  10 .
  9. Reconnect all harness connectors. Start engine. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Engine speed should vary according to valve opening. If operation is as specified, go to step  11 . If operation is not as specified, go to next step.
  10. Remove EVAP-CPVCSV. Using jumper wires, apply battery voltage between EVAP-CPVCSV terminals. See Figure . Check for airflow between ports "A" and "B". Air should flow. Remove jumper wires. Air should not flow. If operation is as specified, go to next step. If operation is not as specified, replace EVAP-CPVCSV.
  11. Disconnect hose from EVAP-CVCV. Check hose for blockage. If blockage is found, clean with compressed air. If blockage is not found, go to next step.
  12. 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.
  13. If using CONSULT-II, go to next step. If using generic scan tool, go to step  15 .
  14. 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  16 . If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV.
  15. 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.
  16. 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  18 . 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 step  18 .
  17. Inspect EVAP canister for damage. Replace, if necessary. Also, check hose between water separator and EVAP canister for blockage or poor connection. If problem is found, repair as necessary. If problem is not found, go to next step.
    18. CAUTION: DO NOT disassemble water separator.
  18. 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.
  19. 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