DTC P011B Engine Coolant Temperature / Intake Air Temperature Correlation: Description

The ECM calculates the difference between the readings of the coolant temperature sensor and intake air temperature sensor. If the difference is greater than 20°C (68°F), the ECM will judge this as a malfunction and will set this DTC.

DTC TROUBLE DETECTION CHART

DTC No.	DTC Detection Condition	Trouble Area
P011B	When conditions (a), (b), (c), (d) and (e) are met (2 trip detection) Battery voltage is 10.5 V or more 37.5 seconds after the engine has been started after the ignition switch has been OFF for more than 7 hours The minimum intake air temperature after the engine has been started is more than -10°C (14°F) The average coolant temperature before the engine is started is more than -10°C (14°F) The difference between the readings of the ECT and IAT is greater than 20°C (36°F)	IAT sensor ECT sensor ECM

Fig 1: Coolant Temperature Sensor And Intake Air Temperature Sensor Graph

HINT:

Waiting is required to prevent the temperature of the engine from affecting the readings. If the engine has been operated recently, it will not be 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 temperature of the ECT and IAT are very similar. When the vehicle has been parked for less than 7 hours, differences in the readings may exist, this does not necessarily indicate a fault.