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P0116 ECT SENSOR EC-647 < DTC/CIRCUIT DIAGNOSIS > [VQ40DE FOR USA AND CANADA] C D E F G H I J K L M A EC N P O P0116 ECT SENSOR Component Description INFOID:0000000009481292 The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the ther- mistor decreases as temperature increases. <Reference data> *: This data is reference value and is measured between ECM terminal 70 (Engine CAUTION: Never use ECM ground terminals when measuring input/output voltage. Doing so may result in dam- age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground. On Board Diagnosis Logic INFOID:0000000009481293 DTC Confirmation Procedure INFOID:0000000009481294 1. INSPECTION START Is it necessary to erase permanent DTC? YES >> GO TO 3. NO >> GO TO 2. 2. PERFORM COMPONENT FUNCTION CHECK Perform component function check. Refer to EC-648, "Component Function Check" . NOTE: Use the component function check to check the overall function of the ECT sensor circuit. During this check, a 1st trip DTC might not be confirmed. YES >> INSPECTION END SEF594K Engine coolant temperature [ °C (°F)] Voltage* (V) Resistance (k Ω) −10 (14) 4.4 7.0 - 11.4 20 (68) 3.5 2.1 - 2.9 50 (122) 2.2 0.68 - 1.00 90 (194) 0.9 0.236 - 0.260 SEF012P DTC No. Trouble diagnosis (Trouble diagnosis content) DTC detecting condition Possible cause P0116 ECT SEN/CIRC The comparison result of signals transmitted • Harness or connectors (High or low resistance in the ECT • ECT sensor |