Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 eg cip0110

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                                                                                                                                                                   DI-27
                                                                      DIAGNOSTICS       -   ENGINE
                                                                                                                                                                   DI21U-03




        DTC                                 P0110               Intake Air Temp. Circuit Malfunction

CIRCUIT DESCRIPTION
The intake air temp. sensor is built into the air flow meter and senses the intake air temperature.
A thermistor built in the sensor changes the resistance value according to the intake air temperature.
The lower the intake air temperature, the greater the thermistor resistance value, and the higher the intake
air temperature, the lower the thermistor resistance value (See Fig. 1).
The intake air temperature sensor is connected to the ECM. The 5 V power source voltage in the ECM is
applied to the intake air temperature sensor from the terminal THA via resistor R.
That is, the resistor R and the intake air temperature sensor are connected in series. When the resistance
value of the intake air temperature sensor changes in accordance with changes in the intake air temperature,
the potential at terminal THA also changes. Based on this signal, the ECM increases the fuel injection vol-
ume to improve driveability during cold engine operation.
 If the ECM detects the DTC P0110, it operates the fail-safe function in which the intake air temperature is
assumed to be 20

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