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Home >> Lexus >> 2003 >> GS 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0110, DTC P0112 Or DTC P0113 >> Circuit Description
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Circuit Description

The intake air temperature sensor is built into the mass airflow sensor 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 becomes, the greater the thermistor resistance value, and the higher the intake air temperature becomes, the lower the thermistor resistance value The intake air temperature sensor is connected to the ECM. The 5 volt power source voltage in the ECM is applied to the intake air temperature sensor from terminal THA via resistor "R". 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 volume to improve driveability during cold engine operation. See Fig 1-Fig 2 . Possible causes are:

Fig 1: Identifying Intake Air Temperature Operation
G00241679Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Identifying Intake Air Temperature Circuit
G00241680Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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