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                                                                                                                                                          DI-27
                                                                       DIAGNOSTICS   -   ENGINE
                                                                                                                                                          DI6UX-04




        DTC                                   P0110              Intake Air Temp. Circuit Malfunction

CIRCUIT DESCRIPTION
                                                                            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
                  20
                                                                            temperature, the greater the thermistor resistance value, and
                  10                                                        the higher the intake air temperature, the lower the thermistor
                                                                            resistance value (See fig.1).
                   5
                                                 Acceptable                 The air intake temperature sensor is connected to the ECM
   Resistance k




                   3
                   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
                   1
                                                                            a resistor R.
                  0.5
                  0.3
                                                                            That is, the resistor R and the intake air temp. sensor are con-
                                                                            nected in series. When the resistance value of the intake air
                  0.2
                                                                            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.
                                  Temp.

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