DTC P0516-769: Battery Temperature Sensor Circuit Low; DTC P0517-770: Battery Temperature Sensor Circuit High [08/2013 - ]: Description
WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.
- The thermistor assembly detects the auxiliary battery temperature. The resistance of the thermistor assembly built into the thermistor changes in accordance with changes in the auxiliary battery temperature. The lower the auxiliary battery temperature, the higher the thermistor assembly resistance. Conversely, the higher the temperature, the lower the resistance. The thermistor assembly is connected to the power management control ECU. A voltage of 5 V is supplied to the thermistor assembly from the THB terminal of the power management control ECU through its internal resistor R. This means that resistor R and the thermistor assembly are connected in series. The voltage at the THB terminal and the resistance value change in accordance with changes in the auxiliary battery temperature. Based on this signal, the power management control ECU reduces the charging current when the auxiliary battery temperature is high to protect the auxiliary battery.
HINT:
Characteristics of the thermistor assembly resistance (reference values) are as follows.
Terminal THB
(with Connector Disconnected)Resistance Ambient Temperature THB - E2 4.5 to 5.5 V 3.00 to 3.73 kΩ Approximately 10°C (50°F) 1.60 to 1.80 kΩ Approximately 25°C (77°F) 0.80 to 1.00 kΩ Approximately 40°C (104°F)
| DTC No. | INF Code | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| P0516 | 769 | Malfunction in the thermistor assembly circuit (short to GND) |
|
| P0517 | 770 | Malfunction in the thermistor assembly circuit (open or short to +B) |