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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Self-Diagnostics - 1.8L - XE, GXE) >> Diagnostic Tests >> DTC P0442: EVAP Control System Small Leak Detected (Negative Pressure) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

  1. Check Fuel Filler Cap Installation

    Ensure fuel cap is original equipment. Attempt to turn fuel cap clockwise. If fuel cap was tightened properly, go to next step. If fuel cap was not tightened properly, clean fuel cap and filler neck with compressed air. Perform DTC CONFIRMATION TEST  to verify repair.

  2. Check Fuel Filler Cap Function

    While removing fuel cap, listen for air escaping from fuel tank. If air escaped from fuel tank, go to step  4 . If air did not escape from fuel tank, go to next step.

  3. Check Fuel Tank Vacuum Relief Valve

    Using a suitable hand vacuum/pressure pump with Fuel Filler Cap Adapter (MLR-8382), apply pressure and vacuum to fuel cap. Fuel cap vacuum relief valve should open when pressure reaches 2.22-2.90 psi (15.3-20.0 kPa) and when vacuum reaches .98-1.78 in. Hg (3.3-6.0 kPa). If operation is as specified, go to next step. If operation is not as specified, replace fuel cap. Perform DTC CONFIRMATION TEST  to verify repair.

  4. Install Pressure Pump

    Connect EVAP Service Port Adapter (J41413-OBD) to EVAP service port. See Figure . Connect a suitable pressure pump to adapter. DO NOT use compressed air. If using CONSULT-II, go to next step. If using generic scan tool, go to step  6 .

  5. Check For EVAP Leak (With CONSULT-II)

    Turn ignition on. Select EVAP SYSTEM CLOSE of WORK SUPPORT mode with CONSULT-II. Press START. Observe pressure indicator on CONSULT-II. Apply pressure to EVAP system until pressure indicator reaches middle of bar graph. DO NOT exceed .6 psi (4.12 kPa) of pressure. Using Leak Detector (J41416), locate EVAP leak. See VACUUM DIAGRAMS article. If a leak is found, repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair. If no leak is found, go to step  7 .

  6. Check For EVAP Leak (Without CONSULT-II)

    Turn ignition off. Disconnect EVAP Canister Vent Control Valve (EVAP-CVCV) and vacuum cut valve by-pass valve harness connectors. See Figure . Using jumper wires, apply battery voltage to EVAP-CVCV and vacuum cut valve by-pass valve terminals. See Fig 1 . Apply .2-.4 psi (1.38-2.76 kPa) of pressure to EVAP service port. DO NOT exceed .6 psi (4.12 kPa) of pressure. Remove pressure pump from EVAP service port. Using Leak Detector (J41416), locate EVAP system leak. See VACUUM DIAGRAMS article. If leak is found, repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair. If leak is not is found, go to next step.

  7. Release EVAP Line Pressure

    With CONSULT-II

    1. Press BACK on CONSULT-II screen.

    Without CONSULT-II

    1. Remove jumper wires. Reconnect EVAP-CVCV and vacuum cut valve by-pass valve harness connectors.

    Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Start engine and let it idle for 90 seconds. Keep engine speed at about 2000 RPM for 30 seconds. Turn ignition off. Go to next step.

    8. CAUTION: DO NOT disassemble water separator.

  8. Check Water Separator
    Check water separator as shown in illustration. See Fig 2 . If water separator is okay, go to next step. If water separator is not okay, replace water separator. Perform DTC CONFIRMATION TEST  to verify repair.

  9. Check EVAP-CVCV, "O" Ring & Circuit

    Check EVAP-CVCV, "O" ring and circuit. Perform DTC CONFIRMATION TEST  under DTC P1446: EVAP CANISTER VENT CONTROL VALVE. If 1st trip DTC is detected, repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair. If 1st trip DTC is not detected, go to next step.

  10. Check If EVAP Canister Is Saturated With Water

    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  13 . If water drains from EVAP canister, go to next step.

  11. Check EVAP Canister

    Weigh EVAP canister with EVAP-CVCV attached. If weight is 4.0 lbs. (1.8 kg) or more, go to next step. If weight is less than 4.0 lbs. (1.8 kg), go to step  13 .

  12. Detect Malfunctioning Part

    Inspect EVAP canister for damage. Also, check hose between water separator and EVAP canister for blockage or poor connection. If problem is found, repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair. If problem is not found, go to next step.

  13. Check EVAP-CPVCSV Operation

    With CONSULT-II

    1. Disconnect vacuum hose connected to EVAP-CPVCSV at EVAP service port. See Figure . Connect vacuum gauge to disconnected hose. Start engine and let it idle. Select PURG VOL CONT/V in ACTIVE TEST mode with CONSULT-II. Increase engine speed to 2000 RPM. Press "Qu" on CONSULT-II screen to adjust PURG VOL CONT/V opening. When opening is 100 percent, vacuum should exist. When opening is zero percent, vacuum should not exist. If vacuum is as specified, go to step  15 . If vacuum is not as specified, go to next step.

    Without CONSULT-II

    1. Start engine and warm to normal operating temperature. Turn ignition off. Disconnect vacuum hose connected to EVAP-CPVCSV at EVAP service port. See Figure . Connect vacuum gauge to disconnected hose. Start engine and let it idle for at least 80 seconds. Check for vacuum while increasing engine speed to 2000 RPM. Vacuum should exist. Release throttle and let engine idle. Vacuum should not exist. If vacuum is as specified, go to step  16 . If vacuum is not as specified, go to next step.

  14. Check Vacuum Hoses

    Check EVAP system vacuum hoses for clogging or disconnection. See VACUUM DIAGRAMS article. If problem is found, repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair. If problem is not found, go to next step.

  15. Check EVAP-CPVCSV

    If not using CONSULT-II, go to next step. If using CONSULT-II, 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  17 . If operation is not as specified, go to next step.

  16. Check EVAP-CPVCSV

    Turn ignition off. Remove EVAP-CPVCSV. See Figure . Using jumper wires, apply battery voltage to EVAP-CPVCSV terminals. See Figure . Air should flow between ports "A" and "B". 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. Perform DTC CONFIRMATION TEST  to verify repair.

  17. Check FTT Sensor

    Check FTT sensor as shown in illustration. See Figure . If FTT sensor is okay, go to next step. If FTT sensor is not okay, replace FTT sensor. Perform DTC CONFIRMATION TEST  to verify repair.

  18. Check EVAP-CSPS

    Check EVAP-CSPS as shown in illustration. See Fig 3 . If EVAP-CSPS is okay, go to next step. If EVAP-CSPS is not okay, replace EVAP-CSPS. Perform DTC CONFIRMATION TEST  to verify repair.

  19. Check EVAP Purge Line

    Inspect EVAP purge line for evidence of leaks. See VACUUM DIAGRAMS article. If problem is found, repair as necessary. Perform DTC CONFIRMATION TEST  to verify repair. If problem is not found, clean purge line with compressed air, and go to next step.

  20. Check Refueling EVAP Vapor Line

    Check refueling EVAP vapor line between EVAP canister and fuel tank for clogging, kink, looseness or improper connection. See VACUUM DIAGRAMS article. If problem is found, repair or replace hoses or tubes as necessary. Perform DTC CONFIRMATION TEST  to verify repair. If problem is not found, go to next step.

  21. Check Signal Line & Recirculation Line

    Check signal line and recirculation line between filler neck and fuel tank for clogging, kink, cracks, looseness and improper connection. If problem is found, repair or replace hoses, tubes or filler neck as necessary. Perform DTC CONFIRMATION TEST  to verify repair. If problem is not found, go to next step.

  22. Check Refueling Control Valve

    Check refueling control valve. See FUEL EVAPORATION CONTROL SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If refueling control valve is okay, go to next step. If refueling control valve is not okay, replace fuel tank. Perform DTC CONFIRMATION TEST  to verify repair.

  23. Check Fuel Level Sensor

    Check fuel level sensor as shown in illustration. See Fig 4 . If fuel level sensor is okay, go to next step. If fuel level sensor is not okay, replace fuel level sensor. Perform DTC CONFIRMATION TEST  to verify repair.

  24. Check For Intermittent

    Check for intermittent condition. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article. Perform DTC CONFIRMATION TEST  to verify repair.
Fig 1: Checking For EVAP Leak
G00164652Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 2: Testing Water Separator
G00164651Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 3: Testing EVAP-CSPS
G00164653Courtesy of NISSAN MOTOR CO., U.S.A.
Fig 4: Testing Fuel Level Sensor
G00164654Courtesy of NISSAN MOTOR CO., U.S.A.
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