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Toyota Sienna Service Manual: Mass or Volume Air Flow Circuit Range / Performance Problem

Toyota Sienna Service Manual / 2GR-FE Engine control system / SFI system / Diagnostic trouble code chart / Mass or Volume Air Flow Circuit Range / Performance Problem

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

DESCRIPTION

Refer to DTC P0100

DTC No.

DTC Detection Condition

Trouble Area

P0101

  1. High voltage: Conditions (a), (b) and (c) continue for more than 10 seconds (2 trip detection logic):
  1.  Engine speed is less than 2000 rpm
  2.  Engine coolant temperature is 70C (158F) or higher
  3.  Voltage output of Mass Air Flow (MAF) meter is more than 1.24 V (varies with Throttle Position [TP] sensor voltage)
  1. Low voltage: Conditions (a) and (b) continue for more than 10 seconds (2 trip detection logic):
  1.  Engine speed is more than 300 rpm
  2.  Voltage output of MAF meter is less than 0.80 V (varies with TP sensor voltage)
MAF meter

MONITOR DESCRIPTION

The MAF meter is a sensor that measures the amount of air flowing through the throttle valve. The ECM uses this information to determine the fuel injection time and to provide an appropriate air-fuel ratio.

Inside the MAF meter, there is a heated platinum wire which is exposed to the flow of intake air. By applying a specific electrical current to the wire, the ECM heats it to a specific temperature. The flow of incoming air cools both the wire and an internal thermistor, changing their resistance. To maintain a constant current value, the ECM varies the voltage applied to these components of the MAF meter. The voltage level is proportional to the air flow through the sensor, and the ECM uses it to calculate the intake air volume.

If there is a defect in the sensor, or an open or short in the circuit, the voltage level deviates from the normal operating range. The ECM interprets this deviation as a malfunction in the MAF meter and sets the DTC.

Example: If the voltage is more than 2.2 V, or less than 0.73 V while idling, the ECM determines that there is a malfunction in the MAF meter and sets the DTC.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

Refer to DTC P0100

INSPECTION PROCEDURE

HINT: Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air-fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction

1 CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0101)

  1. Connect the intelligent tester to the DLC3.
  2.  Turn the ignition switch to the ON position.
  3.  Turn the tester on.
  4.  Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
  5.  Read the DTCs.

Result

Result

HINT: If any DTCs other than P0101 are output, troubleshoot those DTCs first.

GO TO DTC CHART

Mass or Volume Air Flow Circuit/ Mass or Volume Air Flow Circuit Low Input/ Mass or Volume Air Flow Circuit High Input
DESCRIPTION The Mass Air Flow (MAF) meter is a sensor that measures the amount of air flowing through the throttle valve. The ECM uses this information to determine the fuel injection time and to ...

Intake Air Temperature Circuit/ Intake Air Temperature Circuit Low Input/ Intake Air Temperature Circuit High Input
DTC P0110 Intake Air Temperature Circuit DTC P0112 Intake Air Temperature Circuit Low Input DTC P0113 Intake Air Temperature Circuit High Input DESCRIPTION The Intake Air Temperature (IAT) sensor, ...

Other materials:

Inspection
1. INSPECT WINDSHIELD WIPER MOTOR ASSEMBLY  LO Operation Check  Connect the battery (+) to the terminal 1 (+1) of the connector, the battery (-) to the terminal 5 (E) of the connector, and check that the motor operates at low speed (LO).  HI Operation Check ...

Installation
1. INSTALL BRAKE ACTUATOR (a) Install the brake actuator assembly with the 2 nuts. Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf) 2. INSTALL BRAKE ACTUATOR WITH BRACKET (a) Install the actuator with bracket with the 3 bolts. Torque: 20 N*m (199 kgf*cm, 14 ft.*lbf) NOTICE: Be careful not to dam ...

Precaution
CAUTION:  The vehicle is equipped with a Supplemental Restraint System (SRS). It consists of a driver airbag, front passenger airbag, front seat side airbag, curtain shield airbag, and front seat belt pretensioner. Failure to carry out service operations in the correct sequence co ...

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