DTC P0115-11: Engine Coolant Temperature Sensor 1 Circuit Short to Ground [12/2023 - ]: Description

WARNING: This page is about a different car, the 2024 Lexus TX 550h+. However, it is still accessible from the selected car via links, so may be relevant.

A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor. The structure of the thermistor in the engine coolant temperature sensor and its connection to the ECM are the same as those of the intake air temperature sensor.

Refer to DTC P0110-11.

Refer to DESCRIPTION

HINT:

When DTC P0115-11 is stored, the ECM enters fail-safe mode. During fail-safe mode, the engine coolant temperature is estimated to be 80°C (176°F) by the ECM. Fail-safe mode continues until a pass condition is detected.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P0115-11	Engine Coolant Temperature Sensor 1 Circuit Short to Ground	The engine coolant temperature sensor output voltage is less than 0.142 V for 0.5 seconds or more (1 trip detection logic).	Short in engine coolant temperature sensor circuit Engine coolant temperature sensor ECM	Comes on	Engine	A	SAE Code: P0117

HINT:

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

Refer to DATA LIST / ACTIVE TEST [12/2023 - ]

DTC No.	Coolant Temperature	Malfunction
P0115-11	Higher than 135°C (275°F)	Short to ground in THW circuit

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