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Thread: code P0452

  1. #1
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    code P0452

    hey i have a 2000 Chevy S10 pickup 4.3 Auto with 159000 miles and it has a code P0452 what does this code mean and what would cause it?
    .

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  2. #2
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    Re: code P0452

    P0452
    Notes

    CIRCUIT DESCRIPTION
    The Powertrain Control Module (PCM) monitors the Fuel Tank Pressure (FTP) sensor signal in order to detect vacuum decay and excess vacuum during the enhanced Evaporative Emission (EVAP) diagnostic. The PCM supplies a 5-volt reference and ground to the sensor. The FTP sensor signal voltage increases when the fuel tank pressure decreases. Negative pressure or vacuum indicates high voltage. The FTP sensor signal voltage decreases when the fuel tank pressure increases. Positive pressure indicates low voltage. This DTC sets when the FTP sensor signal goes below a predetermined value.

    CONDITIONS FOR RUNNING THE DTC
    The engine is running.

    CONDITIONS FOR SETTING THE DTC


    The fuel tank pressure sensor voltage is less than 0.1 volts .
    All conditions are present for more than 5 seconds .
    ACTION TAKEN WHEN THE DTC SETS


    The control module illuminates the Malfunction Indicator Lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
    The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
    CONDITIONS FOR CLEARING THE MIL/DTC


    The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
    A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
    A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
    Use a scan tool in order to clear the MIL and the DTC.
    TEST DESCRIPTION

    And check the gas cap gasket.....
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