DTC P011B-62: Engine Coolant Temperature / Intake Air Temperature Signal Compare Failure [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.

This engine uses an engine coolant temperature sensor and an intake air temperature sensor to detect temperatures related to engine operation. A thermistor, whose resistance value varies according to the temperature, is built into each sensor. When the temperature becomes low, the resistance of the thermistor increases. When the temperature becomes high, the resistance decreases. These variations in resistance are transmitted to the ECM as voltage changes.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	DTC Output from	Priority	Note
P011B-62	Engine Coolant Temperature / Intake Air Temperature Signal Compare Failure	Both of the following conditions are met (2 trip detection logic): All of the following conditions are met: The auxiliary battery voltage is 10.5 V or higher. 5 hours have elapsed since the ignition switch was turned off in the previous trip. Either of the following conditions is met: The intake air temperature is -10°C (14°F) or higher. The engine coolant temperature is -10°C (14°F) or higher. The difference between the readings of the engine coolant temperature and intake air temperature is higher than 22.5°C (72.5°F). All of the following conditions are met: The auxiliary battery voltage is 10.5 V or higher. 7 hours or more have elapsed since the ignition switch was turned off in the previous trip. 82 seconds or more have elapsed since a cold engine start was performed. Either of the following conditions is met: The minimum intake air temperature after the engine starts is -10°C (14°F) or higher. The engine coolant temperature before the engine starts is -10°C (14°F) or higher. The difference between the readings of the engine coolant temperature and intake air temperature is higher than 22.5°C (72.5°F).	Intake air temperature sensor (mass air flow meter sub-assembly) Engine coolant temperature sensor ECM	Comes on	Engine	B	SAE Code: P011B

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HINT:

Waiting is required to prevent the temperature of the engine from affecting the readings. If the engine has been operated recently, it is not possible to accurately compare the readings.

For diagnosis, in order to duplicate the detection conditions of the DTC, it is necessary to park the vehicle for 7 hours. Parking the vehicle for 7 hours ensures that the actual engine coolant temperature and intake air temperature are very similar. When the vehicle has been parked for less than 7 hours, differences in the readings may exist, but this does not necessarily indicate a fault.