Toyota Corolla (E120) 2002–2008 Repair Manual / Diagnostics / Sfi system / Mass or volume air flow circuit
range/performance problem / Circuit description
Toyota Corolla (E120): Circuit description
Refer to dtcs p0100
|
Dtc no. |
Dtc detection condition | Trouble area |
| P0101 | After engine is warmed up, conditions (a) to (d) continue for
more than 10 seconds (2 trip detection logic):
|
|
Conditions (a) and (b) continue for more than 6 seconds: (2 trip
detection logic)
|
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

Typical enabling conditions

Typical malfunction thresholds

Wiring diagram
Refer to dtc p0100
Other materials:
Stabilizer bar rear
Replacement
Hint: components:
1. Remove stabilizer bar rear
Remove the 2 bolts, nuts and stabilizer bar.
2. Install stabilizer bar rear
Install the 2 bolts, nuts and stabilizer bar.
Torque: 195 nvm (1,990 Kgf·cm, 144 ft·lbf)
Hint:
install the stabilizer bar so that the ...
Other functions
■ Switching between outside air and recirculated air modes
Press .
The mode switches between outside air mode (indicator off) and recirculated air
mode (indicator on) each time is pressed.
■ Defogging the windshield
Defoggers are used to defog the windshield and front side windows ...
Child restraint systems
Before installing a child
restraint system in the vehicle,
there are precautions
that need to be observed,
different types of child
restraint systems, as well as
installation methods, etc.,
written in this manual.
Use a child restraint system
when riding with a small child
that cannot properly use a ...


