DTC P0195-11: Engine Oil Temperature Sensor Circuit Short to Ground [09/2023 - ]: Description

WARNING: This page is about a different car, the 2024 Lexus TX 500h. However, it is still accessible from the selected car via links, so may be relevant.

A thermistor, whose resistance changes in accordance with the engine oil temperature, is built into the engine oil temperature sensor. As the engine oil temperature decreases, the thermistor resistance increases and as the engine oil temperature increases, the thermistor resistance decreases. The engine oil temperature sensor is connected to the ECM. A voltage of 5 V is supplied from terminal THEO via resistor R of the ECM. Since resistor R and the engine oil temperature sensor are connected in series, both the resistance and the electrical potential of THEO are subject to change in accordance with a change in the engine oil temperature.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P0195-11	Engine Oil Temperature Sensor Circuit Short to Ground	The engine oil temperature sensor output voltage is less than 0.13 V for 5 seconds or more (1 trip detection logic).	Short in engine oil temperature sensor circuit Engine oil temperature sensor ECM	Comes on / Does not come on	Engine	A	SAE Code: P0197 DTC for Mexico Models: Applies

HINT:

When a DTC is output, check the Data List item "Engine Oil Temperature Sensor" using the GTS.

Refer to DATA LIST / ACTIVE TEST [09/2023 - ]

DTC No.	Engine Oil Temperature Sensor	Malfunction
P0195-11	Higher than 170°C (338°F)	Short to ground in THEO circuit

If the Data List displays a normal value, the normal value may be due to a temporary recovery from the malfunction condition. Check for intermittent problems.