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DIAGNOSTICS - ENGINE
DTC P0110 Intake Air Temp. Circuit Malfunction
The intake air temp. sensor is built into the mass air flow meter
(fig.1) and senses the intake air temperature.
A thermistor built in the sensor changes the resistance value
30 according to the intake air temperature, the lower the intake air
temperature, the greater the thermistor resistance value, and
10 the higher the intake air temperature, the lower the thermistor
resistance value (See fig.1).
Acceptable The air intake temperature sensor is connected to the ECM
2 (See below). The 5V power source voltage in the ECM is ap-
plied to the intake air temp. sensor from the terminal THA via
a resistor R.
That is, the resistor R and the intake air temp. sensor are con-
nected in series. When the resistance value of the intake air
temp. sensor changes in accordance with changes in the intake
0.1 air temperature, the potential at terminal THA also changes.
Based on this signal, the ECM increases the fuel injection vol-
- 20 0 20 40 60 80 100
(- 4) 32 68 104 140 176 212 ume to improve driveability during cold engine operation.
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