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Thread: 1997 Nissan Sentra Check Engine

  1. #1
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    1997 Nissan Sentra Check Engine

    My check engine light came on. My scanner codes read P0440 and P0446. Any help to point me in the correct direction would be appreciated. Thanks.

  2. #2
    North of the land of Hey Huns
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    Error Code P0440:

    The evaporative leak detection diagnostic strategy is based on applying vacuum to the EVAP system and monitoring vacuum decay. The PCM monitors vacuum level via the Fuel Tank Pressure sensor input. At an appropriate time, the EVAP purge valve and the EVAP canister vent valve are turned ON, allowing engine vacuum to draw a small vacuum on the entire evaporative emission system. If a sufficient vacuum level cannot be achieved, a large leak or a malfunctioning EVAP purge valve is indicated. This can be caused by the following conditions:

    Disconnected or malfunctioning fuel tank pressure sensor.
    Missing or malfunctioning fuel cap.
    Disconnected, damaged, pinched, or blocked EVAP purge line.
    Disconnected or damaged EVAP canister vent hose.
    Disconnected, damaged, pinched, or blocked fuel tank vapor line.
    Disconnected or malfunctioning EVAP purge valve.
    Disconnected or malfunctioning EVAP canister vent valve.
    Open ignition feed circuit to the EVAP canister vent or purge valve.
    Damaged evaporative emissions canister.
    Leaking fuel sender assembly O-ring.
    Leaking fuel tank or fuel tiller neck Any of the above conditions can set DTC P0440.

    CONDITIONS FOR RUNNING THE DTC

    No VSS, TP sensor, HO2S, Misfire, IAT sensor, MAP sensor, Fuel Trim, Fuel Injector(s), EGR Pintle Position, ECT, or MAF sensor DTC(s) set.
    Start up engine coolant temperature is between 4C and 30C (40F and 86F).
    Start up intake air temperature is between 4C and 30C (40F and 86F).
    Fuel tank fuel level is between 15% and 85%.
    BARO is greater than 75 kPa.
    System voltage is between 8 and 16 volts.


    Not sure about the other one, but I'd check your vacume hoses, your EGR valve and gas cap to start with.

  3. #3
    Newbie alz0rz's Avatar
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    check your gas cap.
    2005 Velocity Red RX-8 GT

  4. #4
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    I already replaced the gas cap, cleared the codes, and 200 miles later both codes appeared again.

  5. #5
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    What's up with this car?

  6. #6
    North of the land of Hey Huns
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    There is a whole list of things to check in my above post, if you have gone through all of those and nothing is wrong, then perhaps you should take your car to a mechanic.

  7. #7
    Constant Bitrate cla1067's Avatar
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    *brings up a year old topic out of the grave* I have the same error on my 1997 Nissan Sentra GXE. I think it is the egr valve, so I got to check that today and see how it goes.

    -----------------------------------------------------------------------------------------------------------------------
    Note:
    I am just posting here because it is the same exact issue and guess it is common on this car.

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