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P0117, P0118 ECT SENSOR EC-189 < DTC/CIRCUIT DIAGNOSIS > [VK56DE] C D E F G H I J K L M A EC N P O P0117, P0118 ECT SENSOR Component Description INFOID:0000000009886590 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 73 (Engine CAUTION: Do not 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:0000000009886591 These self-diagnoses have the one trip detection logic. FAIL-SAFE MODE When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up. 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 Name DTC Detecting Condition Possible Cause P0117 Engine coolant temperature An excessively low voltage from the sensor is • Harness or connectors (The sensor circuit is open or shorted.) • Engine coolant temperature sensor P0118 Engine coolant temperature An excessively high voltage from the sensor is Detected items Engine operating condition in fail-safe mode Engine coolant temper- ature sensor circuit Engine coolant temperature will be determined by ECM based on the following condition. Condition Engine coolant temperature decided (CONSULT display) Just as ignition switch is turned ON or START 40 °C (104°F) Approx. 4 minutes or more after engine starting 80 °C (176°F) Except as shown above 40 - 80 °C (104 - 176°F) (Depends on the time) |