DTC P0116 Engine Coolant Temperature Circuit Range / Performance Problem: Description

A thermistor is built into the Engine Coolant Temperature (ECT) sensor, of which the resistance value varies according to the ECT.

The structure of the sensor and its connection to the ECM (Included in HV Control ECU) are the same as those of the Intake Air Temperature (IAT) sensor.

DIAGNOSTIC TROUBLE CODE CHART

DTC No.	DTC Detection Condition	Trouble Area
P0116	Case 1: Engine Coolant Temperature (ECT) between 35°C and 60°C (95°F and 140°F) when engine started, and conditions (a) and (b) met (2 trip detection logic): Vehicle driven at varying speeds (accelerated and decelerated) ECT remains within 3°C (5.4°F) of initial ECT Case 2: ECT more than 60°C (140°F) when engine started, and conditions (a) and (b) met (6 trip detection logic): Vehicle driven at varying speeds (accelerated and decelerated) ECT measurements remain within 1°C (1.8°F) of initial ECT on 6 successive occasions	Thermostat ECT sensor

DTC No.

DTC Detection Condition

Trouble Area

P0116

Case 1:
Engine Coolant Temperature (ECT) between 35°C and 60°C (95°F and 140°F) when engine started, and conditions (a) and (b) met (2 trip detection logic):

Vehicle driven at varying speeds (accelerated and decelerated)
ECT remains within 3°C (5.4°F) of initial ECT

Case 2:
ECT more than 60°C (140°F) when engine started, and conditions (a) and (b) met (6 trip detection logic):

Vehicle driven at varying speeds (accelerated and decelerated)
ECT measurements remain within 1°C (1.8°F) of initial ECT on 6 successive occasions

Thermostat
ECT sensor