DTC P3176-863: Transmission Oil Pump Motor Coil Temperature Sensor Circuit Low: Description

The resistance of the temperature sensor (thermistor) installed in the oil pump motor changes in accordance with changes in the oil pump motor temperature. The lower the oil pump motor temperature, the higher the temperature sensor (thermistor) resistance. Conversely, the higher the temperature, the lower the resistance. The oil pump motor temperature sensor (thermistor) is connected to the hybrid vehicle control ECU. A power source voltage of 5 V is supplied to the oil pump motor temperature sensor (thermistor) through terminal TOPM of the hybrid vehicle control ECU. This means that resistor R in the ECU and the oil pump motor temperature sensor (thermistor) are connected in series. The voltage at terminal TOPM and the resistance value change in accordance with changes in the oil pump motor temperature.