LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 112 (Engine Controls Self-Diagnostics - Pathfinder) >> Diagnostic Tests >> DTC P1444: EVAP Canister Purge Volume Control Solenoid Valve - Improper Flow Condition >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Disconnect EVAP-CPVCSV 2-pin harness connector. See Figure. Turn ignition on. Measure voltage between ground and EVAP-CPVCSV harness connector terminal No. 1 (Red/Yellow wire). If battery voltage does not exist, go to next step. If battery voltage exists, go to step  3.
  2. Check following:
    • Check for poor, loose, corroded or damage to terminal connections in harness connectors M32 and F23. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
    • Check for poor, loose, corroded or damage to terminal connections in harness connectors E1 and M1.
    • Check for open in circuits between EVAP-CPVCSV and ECM.
    • Check for open in circuits between EVAP-CPVCSV and ECM relay.
    If problem is found, repair as necessary. After repair, repeat appropriate DTC confirmation test.
  3. Turn ignition off. Disconnect ECM 116-pin harness connector. For ECM location, see Figure. Check continuity of Purple/Red wire between EVAP-CPVCSV harness connector terminal No. 2 and ECM harness connector terminal No. 45. See Figure. Continuity should exist. Also, check circuit for short to ground and short to voltage. If no problem is found, go to next step. If problem is found, repair as necessary. After repair, repeat appropriate DTC confirmation test.
  4. Check for disconnection or improper connection of hose connected to EVAP Canister System Pressure Sensor (EVAP-CSPS). See Figure. If no problem is found, go to next step. If problem is found, repair as necessary. After repair, repeat appropriate DTC confirmation test.
  5. Disconnect EVAP-CSPS 2-pin harness connector. Check connector and terminals for water damage. If water damage does not exist, go to next step. If water damage exists, replace EVAP-CSPS. After repair, repeat appropriate DTC confirmation test.
    6. 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.
  6. Remove EVAP Control System Pressure Sensor (EVAP-CSPS) with its harness connector connected. See Figure. Turn ignition on. Using a hand vacuum pump, apply 2.76 in. Hg (9.3 kPa) of vacuum to EVAP-CSPS. Backprobing at ECM, measure voltage between ground and ECM terminal No. 32 (Blue/Green wire). See Figure and Figure . With 2.76 in. Hg (9.3 kPa) of vacuum applied to EVAP-CSPS, voltage should be .4-.6 volt. When vacuum is removed, 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. After repair, repeat appropriate DTC confirmation procedure.
  7. If using CONSULT-II, go to next step. If not using CONSULT-II, go to step  9.
  8. 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 not as specified, go to next step. If operation is as specified, go to step  10.
  9. Turn ignition off. Remove vacuum hoses from EVAP-CPVCSV. Perform PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. With PURG VOL CONT/V at 100 percent, air should flow between ports "A" and "B". With PURG VOL CONT/V at zero percent, air should not flow between ports "A" and "B". Using generic scan tool, perform following. Disconnect EVAP-CPVCSV 2-pin harness connector. Using jumper wires, apply battery voltage and ground to EVAP-CPVCSV terminals. With battery voltage applied, air should flow between ports "A" and "B". See Figure. 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. After repair, repeat appropriate DTC confirmation procedure.
  10. Disconnect hose from EVAP Canister Vent Control Valve (EVAP-CVCV). Check hose for blockage. If blockage is found, clean with compressed air. If blockage is not found, go to next step.
  11. Remove EVAP-CVCV. Check for rust in port "B". See Figure. If rust does not exist, go to next step. If rust exists, replace EVAP-CVCV. After repair, repeat appropriate DTC confirmation procedure.
  12. If using CONSULT-II, go to next step. If using generic scan tool, go to step  14.
  13. 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". See Figure. It should take less than one second for valve to open or close. If operation is as specified, go to step  15. If operation is not as specified, clean EVAP-CVCV with compressed air, and retest. If operation is still not as specified, replace EVAP-CVCV. After repair, repeat appropriate DTC confirmation procedure.
  14. Using jumper wires, apply battery voltage to EVAP-CVCV terminals. See Figure. With voltage applied, 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. After repair, repeat appropriate DTC confirmation procedure.
  15. 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  17. 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  17.
  16. Inspect EVAP canister for damage. If problem is found, replace as necessary. Also, check hose between water separator and EVAP canister for blockage or poor connection. If no problem is found, go to next step. If problem is found, repair as necessary. After repair, repeat appropriate DTC confirmation procedure.
    17. CAUTION: DO NOT disassemble water separator.
  17. 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. After repair, repeat appropriate DTC confirmation procedure.
  18. 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