DTC P0101 Mass or Volume Air Flow Circuit Range / Performance Problem
DESCRIPTION
Refer to DTC P0100
DTC No. |
DTC Detection Condition |
Trouble Area |
P0101 |
|
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
TYPICAL ENABLING CONDITIONS
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)
Result
HINT: If any DTCs other than P0101 are output, troubleshoot those DTCs first.
GO TO DTC CHART
Precaution
1. INSPECTION PROCEDURE FOR VEHICLE INVOLVED
IN ACCIDENT
Perform the zero point calibration and sensitivity
check if any of the following conditions occur.
The occupant classification ECU is replaced.
Accessories (seatback tray and seat cover, etc.)
are installed.
...
Disposal
HINT:
When scrapping a vehicle equipped with the SRS or
disposing of the front passenger airbag assembly, be sure to
deploy the airbag first in accordance with the procedure
described below. If any abnormality occurs with airbag
deployment, contact the SERVICE DEPT. of the TOYOTA
MOTOR SALES, ...
Installation
1. INSTALL COMPRESSOR AND MAGNETIC CLUTCH
(a) Using a "TORX" socket wrench (E8), install the
compressor and magnetic clutch with the 2 stud
bolts.
Torque: 10 N*m (102 kgf*cm, 7.4 ft.*lbf)
HINT:
Tighten the stud bolts in the order shown in the
illustration.
(b) Install the c ...