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    DTC P0101 Mass or Volume Air Flow Circuit Range/Performance Problem

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    Clodoaldo Biassio
    The document describes a diagnostic trouble code (DTC) P0101 for a mass or volume air flow circuit range/performance problem. It provides details on the circuit, detection conditions for setting the code, monitor description, and monitor strategy. Specifically, it notes that the mass air flow (MAF) sensor helps calculate air flow and fuel injection. It will set DTC P0101 if the sensor voltage is outside the normal operating range of above 2.2V at idle or below 0.4V when idle is switched off, indicating a potential defect in the MAF sensor.

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    DTC P0101 Mass or Volume Air Flow Circuit Range/Performance Problem

    Uploaded by

    Clodoaldo Biassio
    91 views1 page
    The document describes a diagnostic trouble code (DTC) P0101 for a mass or volume air flow circuit range/performance problem. It provides details on the circuit, detection conditions for setting the code, monitor description, and monitor strategy. Specifically, it notes that the mass air flow (MAF) sensor helps calculate air flow and fuel injection. It will set DTC P0101 if the sensor voltage is outside the normal operating range of above 2.2V at idle or below 0.4V when idle is switched off, indicating a potential defect in the MAF sensor.

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    Original Title

    C05 (72)

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    The document describes a diagnostic trouble code (DTC) P0101 for a mass or volume air flow circuit range/performance problem. It provides details on the circuit, detection conditions for setting the code, monitor description, and monitor strategy. Specifically, it notes that the mass air flow (MAF) sensor helps calculate air flow and fuel injection. It will set DTC P0101 if the sensor voltage is outside the normal operating range of above 2.2V at idle or below 0.4V when idle is switched off, indicating a potential defect in the MAF sensor.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    91 views1 page

    DTC P0101 Mass or Volume Air Flow Circuit Range/Performance Problem

    Uploaded by

    Clodoaldo Biassio
    The document describes a diagnostic trouble code (DTC) P0101 for a mass or volume air flow circuit range/performance problem. It provides details on the circuit, detection conditions for setting the code, monitor description, and monitor strategy. Specifically, it notes that the mass air flow (MAF) sensor helps calculate air flow and fuel injection. It will set DTC P0101 if the sensor voltage is outside the normal operating range of above 2.2V at idle or below 0.4V when idle is switched off, indicating a potential defect in the MAF sensor.

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    of 1

    05–72

    DIAGNOSTICS – SFI SYSTEM (April, 2003) 052N9–11

    DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT


    RANGE/PERFORMANCE PROBLEM

    CIRCUIT DESCRIPTION
    Refer to DTCs P0100 on page 05–65.
    DTC No. DTC Detection Condition Trouble Area
    After engine is warmed up, conditions (a) to (d) continue for
    more than 10 seconds (2 trip detection logic):
    (a) Engine speed less than 900 rpm
    (b) Throttle valve fully closed
    (c) Mass air flow sensor output greater than 2.2 V
    P0101  Mass air flow sensor
    (d) Engine coolant temperature higher than 70C (158F)
    Conditions (a) and (b) continue for more than 6 seconds: (2 trip
    detection logic)
    (a) VTA greater than 0.1 V
    (b) Mass air flow sensor output less than 0.4 V

    MONITOR DESCRIPTION
    The MAF (Mass Air Flow) sensor helps the ECM calculates the amount of air flowing through the throttle
    valve. The ECM uses this information to determine the fuel injection time and provides a proper air–fuel ratio.
    Inside the MAF sensor, there is a heated platinum wire exposed to the flow of intake air. By applying a specific
    current to the wire, the ECM heats this wire to a given temperature. The flow of incoming air cools the wire
    and an internal thermister, changing their resistance. To maintain a constant current value, the ECM varies
    the voltage applied to these components in the MAF sensor. The voltage level is proportional to the air flow
    through the sensor and the ECM interprets this voltage as the intake air amount. If there is a defect in the
    sensor or an open or short circuit, the voltage level will deviate outside the normal operating range. The ECM
    interprets this deviation as a defect in the MAF sensor and sets a DTC.
    Example: If the voltage is more than 2.2 V at idle, or less than 0.4 V at idle off, the ECM interprets this as
    a defect in the MAF sensor and sets a DTC.
    MONITOR STRATEGY
    Related DTCs P0101 Mass air flow sensor rationality
    Main sensors Mass air flow sensor
    Required sensors/components Engine speed sensor, engine coolant tempera-
    Related sensors
    ture sensor, throttle position sensor
    Frequency of operation Continuous
    10 seconds (high voltage)
    Duration
    6 seconds (Low voltage)
    MIL operation 2 driving cycles
    Sequence of operation None

    2004 COROLLA (RM1037U)

    Author: Date: 237

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