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P0125 ECT SENSOR EC-257 < DTC/CIRCUIT DIAGNOSIS > [MR FOR NISMO RS MODELS] C D E F G H I J K L M A EC N P O Diagnosis Procedure INFOID:0000000012197817 1. CHECK ENGINE COOLANT TEMPERATURE SENSOR Check the engine coolant temperature sensor. Refer to EC-257, "Component Inspection" Is the inspection result normal? YES >> GO TO 2. NO >> Replace engine coolant temperature sensor. Refer to 2. CHECK THERMOSTAT OPERATION When the engine is cold [lower than 70 °C (158°F)] condition, grasp lower radiator hose and confirm the engine coolant does not flow. YES >> Check intermittent incident. Refer to GI-45, "Intermittent Incident" . NO >> Repair or replace thermostat. Refer to CO-23, "Removal and Installation" Component Inspection INFOID:0000000012197818 1. CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1. Turn ignition switch OFF. 2. Disconnect ECT sensor harness connector. 3. Remove ECT sensor. 4. Check resistance between ECT sensor terminals by heating with hot water as shown in the figure. Is the inspection result normal? YES >> INSPECTION END NO >> Replace engine coolant temperature sensor. Refer to . ECT sensor Condition Resistance (k Ω) + − Terminal 1 2 Temperature [ °C (°F)] 20 (68) 2.37 - 2.63 50 (122) 0.68 - 1.00 90 (194) 0.236 - 0.260 JMBIA0080ZZ |